{"id":14728,"date":"2022-02-28T10:06:00","date_gmt":"2022-02-28T15:06:00","guid":{"rendered":"https:\/\/ventilation-maximum.com\/?p=14728"},"modified":"2023-11-08T08:37:09","modified_gmt":"2023-11-08T13:37:09","slug":"balancing-soffit-vents-and-exhaust-vents","status":"publish","type":"post","link":"https:\/\/ventilation-maximum.com\/en\/attic-ventilation-tips\/balancing-soffit-vents-and-exhaust-vents\/","title":{"rendered":"Keys to Successful Rooftop Ventilation: Balancing soffit vents and exhaust vents"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"14728\" class=\"elementor elementor-14728\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-255437d elementor-section-height-min-height elementor-section-full_width elementor-section-height-default elementor-section-items-middle\" data-id=\"255437d\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-2fbb1a8\" data-id=\"2fbb1a8\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-640008d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"640008d\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-inner-column elementor-element elementor-element-373506f\" data-id=\"373506f\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5ba13a1 elementor-widget elementor-widget-heading\" data-id=\"5ba13a1\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Keys to Successful Rooftop Ventilation: Balancing soffit vents and exhaust vents<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6810ac0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6810ac0\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-cdb417f\" data-id=\"cdb417f\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a31f61e elementor-widget elementor-widget-text-editor\" data-id=\"a31f61e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Over the past couple of decades, we&#8217;ve all been experiencing the increasingly aggressive effects of climate change. Natural disasters such as severe hailstorms, record-breaking high temperatures, and drastic winter cold fronts dropping temperatures in record time, have all led to a need for better building materials. Moreover, current building code legislation is evolving faster than ever, forcing building material manufacturers to keep innovating. Every year, the oscillations in temperatures create an increasing amount of roof ventilation issues given the building&#8217;s existing ventilation systems are lacking performance.<\/p>\n<p><br><\/p>\n<p>In order to ensure that a roof is able to live up to the expected lifespan, understanding some core concepts is essential. In this article, we will discuss the core principles of attic ventilation.&nbsp;<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cedd963 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"cedd963\" data-element_type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;],&quot;exclude_headings_by_selector&quot;:[],&quot;marker_view&quot;:&quot;bullets&quot;,&quot;icon&quot;:{&quot;value&quot;:&quot;&quot;,&quot;library&quot;:&quot;&quot;},&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/h4>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__cedd963\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__cedd963\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__cedd963\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2fdc8ba elementor-widget elementor-widget-heading\" data-id=\"2fdc8ba\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Attic venting ratios: What are the building code requirements?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0b3648a elementor-widget elementor-widget-text-editor\" data-id=\"0b3648a\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>To properly understand the reason why certain roof ventilation systems fail we must first start to comprehend the basics behind the concept, starting with the building code requirements.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-86f6649 elementor-widget elementor-widget-heading\" data-id=\"86f6649\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">National Building Code of Canada (NBC)<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-af688a5 elementor-widget elementor-widget-text-editor\" data-id=\"af688a5\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Below you will find section 9.19 of the NBC which clearly describes the building code requirements for the ventilation of both sloped and flat roofs. Articles 9.19.1.2.2 and 9.19.1.2.3 state that for sloped and flat roofs, the ventilation ratios to be provided to each independently are the following<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-2ce2202 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"2ce2202\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-70d4ca3\" data-id=\"70d4ca3\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7dbd49e elementor-widget elementor-widget-heading\" data-id=\"7dbd49e\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Sloped roof ventilation ratio: 1\/300<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-0460047\" data-id=\"0460047\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-0f71970 elementor-widget elementor-widget-heading\" data-id=\"0f71970\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Flat roof ventilation ratio: 1\/150<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<div class=\"elementor-element elementor-element-c6fbec2 elementor-widget elementor-widget-text-editor\" data-id=\"c6fbec2\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>These venting ratios suggest that for every 150 ft<sup>2<\/sup> or 300 ft<sup>2<\/sup> of insulated ceiling surface area within the attic, 1 ft<sup>2<\/sup> of ventilation area shall be applied to the roof. In addition, following the total vented surface area calculation, the building code also requires a minimum of 25% of the total vented area to be provided in the lower and upper portion of the roof. This, therefore, means that by code requirement, for both sloped and flat roofs, an air intake source (such as a soffit) shall be provided in the lower portion of the roof as well as an exhaust source in the top portion.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bca476f elementor-widget elementor-widget-image\" data-id=\"bca476f\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/CNBC.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"CNBC\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTQ3NzksInVybCI6Imh0dHBzOlwvXC92ZW50aWxhdGlvbi1tYXhpbXVtLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyMlwvMDJcL0NOQkMuanBnIn0%3D\">\n\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"576\" height=\"360\" src=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/CNBC.jpg\" class=\"attachment-full size-full wp-image-14779\" alt=\"\" srcset=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/CNBC.jpg 576w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/CNBC-300x188.jpg 300w\" sizes=\"(max-width: 576px) 100vw, 576px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-07edfb1 elementor-hidden-desktop elementor-hidden-tablet elementor-widget elementor-widget-heading\" data-id=\"07edfb1\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">Tap to Enlarge<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e3c93b6 elementor-widget elementor-widget-heading\" data-id=\"e3c93b6\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">American Building Codes: International Building Code (IBC) and International Residential Codes (IRC)<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cec58c1 elementor-widget elementor-widget-text-editor\" data-id=\"cec58c1\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Although we will be focusing on the National Building Code of Canada&#8217;s legislation in this article, American IBC &amp; IRC standards are slightly different from the Canadian NBC standards.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-52d6876 elementor-widget elementor-widget-text-editor\" data-id=\"52d6876\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Sections 1202.2 of the IBC and section R806 of the IRC both bring forward very similar recommendations in terms of roof ventilation ratios. As you can see below, from section R806.2 of the IRC, the general rule is to consider a ratio of 1\/150 for any given roof (flat or sloped roof). Following this standard, a less restrictive venting ratio of 1\/300 is allowable given the roof satisfies certain conditions as depicted below. It is to be noted, there are no distinctions between flat and sloped roofs. Please verify your local building codes as this recommendation may change according to local legislation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-413140f elementor-widget elementor-widget-image\" data-id=\"413140f\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/vm-blog-4.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"vm-blog-4\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTQ4ODEsInVybCI6Imh0dHBzOlwvXC92ZW50aWxhdGlvbi1tYXhpbXVtLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyMlwvMDJcL3ZtLWJsb2ctNC5qcGcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"768\" height=\"477\" src=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/vm-blog-4-768x477.jpg\" class=\"attachment-medium_large size-medium_large wp-image-14881\" alt=\"\" srcset=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/vm-blog-4-768x477.jpg 768w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/vm-blog-4-300x186.jpg 300w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/vm-blog-4.jpg 998w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5c256e0 elementor-hidden-desktop elementor-hidden-tablet elementor-widget elementor-widget-heading\" data-id=\"5c256e0\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">Tap to Enlarge<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6f738a8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6f738a8\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1080f87\" data-id=\"1080f87\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a79b3b5 elementor-widget elementor-widget-heading\" data-id=\"a79b3b5\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">What are the keys to successful attic ventilation?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e048322 elementor-widget elementor-widget-text-editor\" data-id=\"e048322\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>In both flat and sloped roofs, successful attic venting depends on applying proper ventilation ratios and making sure you provide sufficient space for airflow.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4451d44 elementor-widget elementor-widget-heading\" data-id=\"4451d44\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Balancing your attic intake vents (soffit vents) and your exhaust vents.<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c79c74b elementor-widget elementor-widget-text-editor\" data-id=\"c79c74b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Introducing proper attic venting ratios is easy to understand but not always easy to apply. For any type of system (active, passive, or mechanical ventilation) a healthy venting ratio is one where the attic space requires a minimum of 50% intake ventilation and 50% exhaust, but ideally, a 60\/40 is recommended, when possible.\u00a0<\/p><p>The principle behind this is logical, we want to have a balanced flow between the amount of exhaust air and intake air such as to not choke the exhaust unit\u2019s efficiency. An analogy to this concept would be to compare it to someone drinking a glass of water using a straw: pinch the straw midway, reducing the intake of water, therefore, reducing the amount of water you drink. Similarly to the straw, a roof with insufficient air intake vents would be like &#8220;pinching the straw&#8221; and reducing the efficiency of the exhaust vent, ultimately leading it to fail at its task of properly venting the attic space.\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9c17e7c elementor-widget elementor-widget-heading\" data-id=\"9c17e7c\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Balancing your Ventilation with Mechanical or Active Roof Ventilators<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e2ed780 elementor-widget elementor-widget-text-editor\" data-id=\"e2ed780\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tIn a situation where you would be using active roof ventilators (ie: turbine vents and Maximum vents) or a mechanical roof ventilation system (link to passive vs active vs mechanical article), a lack of soffit vents (intake) will also lead to depressurization of the attic space. This issue might cause the air inside the building to migrate towards the attic space to compensate for the depressurization effect, thus increasing the risks of condensation and mold appearing on the roof deck and structure.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fdf279e elementor-widget elementor-widget-heading\" data-id=\"fdf279e\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Allowing more space for attic ventilation<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1d7c6bd elementor-widget elementor-widget-text-editor\" data-id=\"1d7c6bd\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The second ingredient to successful attic ventilation is ensuring there is sufficient, unobstructed attic space for a healthy airflow to occur. The larger the attic venting space, the easier it is for air to move through it. Similarly to the pinched straw example from before, a small attic space (or a narrower straw) makes airflow even more difficult, and more easily interrupts the airflow.<\/p><p>A direct consequence of slower air movement is that warm, moist air will easily stick to cold surfaces and create condensation. Additionally, mineral wool or blown insulation will further impede the airflow due to a non-uniform surface further obstructing the airflow (unless your attic is equipped with rigid insulation). This will further reduce airflow, thus increasing the risk of condensation and mold growth.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-272dfe6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"272dfe6\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-e48c65b\" data-id=\"e48c65b\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1939055 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"1939055\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/airflow-1.png\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"airflow 1\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTQ3NzUsInVybCI6Imh0dHBzOlwvXC92ZW50aWxhdGlvbi1tYXhpbXVtLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyMlwvMDJcL2FpcmZsb3ctMS5wbmcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"868\" height=\"303\" src=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/airflow-1.png\" class=\"attachment-full size-full wp-image-14775\" alt=\"\" srcset=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/airflow-1.png 868w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/airflow-1-300x105.png 300w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/airflow-1-768x268.png 768w\" sizes=\"(max-width: 868px) 100vw, 868px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9958213 elementor-widget elementor-widget-heading\" data-id=\"9958213\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">Constrained Attic Space Impeding Airflow<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-5238c52\" data-id=\"5238c52\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-78e43a6 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"78e43a6\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/airflow-2.png\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"airflow 2\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTQ3NzcsInVybCI6Imh0dHBzOlwvXC92ZW50aWxhdGlvbi1tYXhpbXVtLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyMlwvMDJcL2FpcmZsb3ctMi5wbmcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"879\" height=\"392\" src=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/airflow-2.png\" class=\"attachment-full size-full wp-image-14777\" alt=\"\" srcset=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/airflow-2.png 879w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/airflow-2-300x134.png 300w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/airflow-2-768x342.png 768w\" sizes=\"(max-width: 879px) 100vw, 879px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-008e012 elementor-widget elementor-widget-heading\" data-id=\"008e012\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<p class=\"elementor-heading-title elementor-size-default\">Open Attic Space Allowing Good Airflow<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<div class=\"elementor-element elementor-element-67dc097 elementor-widget elementor-widget-text-editor\" data-id=\"67dc097\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>An open attic space makes the movement of air easy and without obstructions. The airspeed is greatly increased, and this also improves the attics&#8217; hourly air exchange rate allowing the installed exhaust vents to operate at their full efficiency. In addition, by having better ventilation, the risk of condensation and mold creation is greatly reduced.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-97b19b2 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"97b19b2\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-fba1bea\" data-id=\"fba1bea\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1b9e88e elementor-widget elementor-widget-image\" data-id=\"1b9e88e\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/air-space-measurement.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"air space measurement\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTQ3NzMsInVybCI6Imh0dHBzOlwvXC92ZW50aWxhdGlvbi1tYXhpbXVtLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyMlwvMDJcL2Fpci1zcGFjZS1tZWFzdXJlbWVudC5qcGcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"512\" height=\"341\" src=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/air-space-measurement.jpg\" class=\"attachment-full size-full wp-image-14773\" alt=\"\" srcset=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/air-space-measurement.jpg 512w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/air-space-measurement-300x200.jpg 300w\" sizes=\"(max-width: 512px) 100vw, 512px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d557ac4 elementor-widget elementor-widget-heading\" data-id=\"d557ac4\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How to Calculate Attic Ventilation for Sloped Roofs<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-6cf6a71 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6cf6a71\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-7b57a20\" data-id=\"7b57a20\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7e03cd8 elementor-widget-tablet__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"7e03cd8\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Now that we&#8217;ve gone through the code requirements and the two main keys to success, let&#8217;s focus on the best ways to apply them to avoid having the systems fail.<\/p><p>Let&#8217;s start by considering the recommended venting ratio given in the Canadian National Building Code. Too often, when homeowners or contractors experience condensation or mold issues with an active ventilation system, their first reaction is to blame the exhaust system. Very rarely do they consider the roof ventilation intake to exhaust ratio. The verification can be done with these three steps:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-3293da0\" data-id=\"3293da0\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-57b51c1 elementor-widget-tablet__width-initial elementor-widget elementor-widget-image\" data-id=\"57b51c1\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/sloped-roof.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"sloped roof\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTQ3ODUsInVybCI6Imh0dHBzOlwvXC92ZW50aWxhdGlvbi1tYXhpbXVtLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyMlwvMDJcL3Nsb3BlZC1yb29mLmpwZyJ9\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1229\" height=\"795\" src=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/sloped-roof.jpg\" class=\"attachment-full size-full wp-image-14785\" alt=\"\" srcset=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/sloped-roof.jpg 1229w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/sloped-roof-300x194.jpg 300w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/sloped-roof-1024x662.jpg 1024w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/sloped-roof-768x497.jpg 768w\" sizes=\"(max-width: 1229px) 100vw, 1229px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<div class=\"elementor-element elementor-element-02bf17e elementor-widget elementor-widget-heading\" data-id=\"02bf17e\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">1. Calculate the roof ventilation surface area using the NBC requirements. <\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5f82f0f elementor-widget elementor-widget-text-editor\" data-id=\"5f82f0f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Apply the 1\/300 ratio to the total surface area of the insulated ceiling area giving into the attic. For example, let&#8217;s say we&#8217;re looking at a 1200ft<sup>2<\/sup> home with roof condensation issues and we want to verify our current attic ventilation system. When applying the ratio, the result will give us 4ft2 (1200ft<sup>2<\/sup> \u00f7 300 = 4ft<sup>2<\/sup>) of ventilation area.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d76c128 elementor-widget elementor-widget-heading\" data-id=\"d76c128\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">2. Consider an equal air intake to exhaust system ratio.<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f485b78 elementor-widget elementor-widget-text-editor\" data-id=\"f485b78\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>As mentioned above, a minimum balance of 50\/50 of the total venting surface area is applied to both the intake and exhaust ventilation. In the case of our example, this would mean we would apply 2ft<sup>2<\/sup> of net free area (NFA) to both air intake and exhaust. Additionally, having a higher intake-to-exhaust ratio such as 60\/40 is even better.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1121b8b elementor-widget elementor-widget-heading\" data-id=\"1121b8b\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">3. Calculating attic ventilation for a sloped roof. <\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2b4ce8e elementor-widget elementor-widget-text-editor\" data-id=\"2b4ce8e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The exhaust portion of the system is easy to check, simply determine the NFA rating of the exhaust vent installed on top of the roof and multiply it by the number of units. In the case of our example, having 2 units of model 301-12 from Ventilation Maximum (insert link) (both having 1ft2 NFA each) will indicate sufficient exhaust in the system. The exhaust being verified, let us move our attention to the intake.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-783beeb elementor-widget elementor-widget-heading\" data-id=\"783beeb\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">4. Calculate the necessary ventilation intake vents. <\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cdcf61b elementor-widget elementor-widget-text-editor\" data-id=\"cdcf61b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This requires the following steps:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-94f5739 elementor-widget elementor-widget-heading\" data-id=\"94f5739\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Roughly estimate the home's total surface area of open vented soffits. <\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-37e53ed elementor-widget elementor-widget-text-editor\" data-id=\"37e53ed\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Coming back to our example, the home contains open soffit vents at the eave of a 2-sloped roof. The soffit length on the home is equivalent to 35 feet and the depth is equivalent to 1 foot. Hence, the total soffit surface area is 35ft x 1ft = 35 ft<sup>2<\/sup> for one side, so the total surface area is of 70\u00a0ft<sup>2<\/sup> for both sides.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e6998ba elementor-widget elementor-widget-heading\" data-id=\"e6998ba\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Calculate the total NFA rating of the soffit vent.<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1062fa2 elementor-widget elementor-widget-text-editor\" data-id=\"1062fa2\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Usually, this step requires us to have the specific efficiency of the installed soffit vent but if this is not available, simply use the soffit standard market efficiency of 3% NFA. Back to our example, we will apply 3% soffit vent efficiency to the total 70 ft<sup>2<\/sup> surface area, giving us 2.1 ft<sup>2<\/sup> NFA (70 ft<sup>2<\/sup> x 3% = 2.1 ft<sup>2<\/sup>). Hence, this would confirm that we have the minimum amount of air intake NFA to supply a balanced system as a total of 2ft<sup>2<\/sup> was calculated earlier.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-03149b4 elementor-widget elementor-widget-heading\" data-id=\"03149b4\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">5. Verify if the attic has sufficient space to allow for proper airflow. <\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f1effa8 elementor-widget elementor-widget-text-editor\" data-id=\"f1effa8\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This step is often a little harder to verify as we will have to visually inspect the allowable space for air to flow from the soffits into the roof. The NBC current standards speak of a minimum gap of 2in but we at Ventilation Maximum have concluded that 2in is often not enough given that the insulation installation or roof structure may impede airflow. We prefer recommending a minimum gap of 4 in. to allow proper ventilation to the roof. Hence, verifying the soffit vent is not blocked by insulation or roof structure so that the air is able to move into a minimum air gap of 4 in. to the roof attic space. This verification will confirm that there is proper airflow into the attic space.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9336898 elementor-widget elementor-widget-heading\" data-id=\"9336898\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">6. Verify that the soffits and exhaust vents are well positioned. <\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-24ae7f6 elementor-widget elementor-widget-text-editor\" data-id=\"24ae7f6\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The last step is to verify that both the exhaust vents and soffit vents are installed uniformly on the roof. However, roofs containing dead zones, where they are lacking air flow (intake and\/or exhaust), may also experience condensation issues. If this is the case, local modifications to that specific dead zone section will be necessary to improve airflow. Finally, in most sloped roof applications the issue of having sufficient space for airflow is generally not of concern because the average sloped roof attic space contains enough height for an average person to stand up. To every general condition there are exceptions, here are the roof types to watch out for to which a possible lack of airflow space may occur: low-sloped roofs (slopes ranging from 4\/12 to 2\/12), cathedral roofs, and dormer sections on standard sloped roofs.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9cf8c1e elementor-widget elementor-widget-heading\" data-id=\"9cf8c1e\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How to check your flat roof attic ventilation system<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-92f694c elementor-widget elementor-widget-text-editor\" data-id=\"92f694c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Flat roof ventilation systems are slightly different from sloped roof systems and are often more difficult to properly conceive. First, a flat roof doesn&#8217;t have the given contributing effect of having hot and humid air naturally rise along the roof deck as in a sloped roof application. This requires the system to be designed in such a way as to move air in a desired orientation, thus covering the entire roof surface area. More so, not all flat-roof buildings contain or supply sufficient air intake to the given system. To properly verify the system, the same steps as depicted in the sloped roof section above is to be used but this time by applying a total vented ratio of 1\/150. Additionally, a minimum height clearance of 4in. is once again recommended by Ventilation Maximum to allow proper airflow. Depending on the size of the building and attic to ventilate, 6in or more can further reduce the risks of mold and condensation creation by allowing the airflow to move with more ease. Once done, if the verifications do not depict any problematic features, the impact of other existing conditions such as the lack of a vapor barrier or building imperfections in the ceiling composition may contribute to the given issue. For more tips on prolonging your rooftop, check out our next article on\u00a0<a href=\"https:\/\/ventilation-maximum.com\/en\/ventilation-guide\/avoiding-condensation-problems-in-your-attic\/\">Avoiding Condensation Problems in your Attic<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d943b6e elementor-widget elementor-widget-image\" data-id=\"d943b6e\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/flat-roof.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"flat roof\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6MTQ3ODEsInVybCI6Imh0dHBzOlwvXC92ZW50aWxhdGlvbi1tYXhpbXVtLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyMlwvMDJcL2ZsYXQtcm9vZi5qcGcifQ%3D%3D\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1320\" height=\"924\" src=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/flat-roof.jpg\" class=\"attachment-full size-full wp-image-14781\" alt=\"\" srcset=\"https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/flat-roof.jpg 1320w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/flat-roof-300x210.jpg 300w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/flat-roof-1024x717.jpg 1024w, https:\/\/ventilation-maximum.com\/wp-content\/uploads\/2022\/02\/flat-roof-768x538.jpg 768w\" sizes=\"(max-width: 1320px) 100vw, 1320px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-85910db elementor-widget elementor-widget-text-editor\" data-id=\"85910db\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>To conclude, every homeowner or contractor witnessing signs of a failing attic ventilation system should verify the building&#8217;s attic ventilation ratio, including both intake and exhaust balanced NFA ratings, as well as the given allowable space for airflow to occur before looking further into identifying the problematic source. Feel free to contact us for more information on attic ventilation.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b3bef26 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b3bef26\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-4221a18\" data-id=\"4221a18\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8ad8f0f elementor-widget elementor-widget-text-editor\" data-id=\"8ad8f0f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tAuthor : Jonathan Ramsay Massicotte, P.eng<br \/>\n\tTechnical and development Director at Ventilation Maximum\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Keys to Successful Rooftop Ventilation: Balancing soffit vents and exhaust vents Over the past couple of decades, we&#8217;ve all been experiencing the increasingly aggressive effects of climate change. Natural disasters such as severe hailstorms, record-breaking high temperatures, and drastic winter cold fronts dropping temperatures in record time, have all led to a need for better [&hellip;]<\/p>\n","protected":false},"author":439,"featured_media":14900,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[143],"tags":[],"class_list":["post-14728","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-attic-ventilation-tips"],"_links":{"self":[{"href":"https:\/\/ventilation-maximum.com\/en\/wp-json\/wp\/v2\/posts\/14728","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ventilation-maximum.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ventilation-maximum.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ventilation-maximum.com\/en\/wp-json\/wp\/v2\/users\/439"}],"replies":[{"embeddable":true,"href":"https:\/\/ventilation-maximum.com\/en\/wp-json\/wp\/v2\/comments?post=14728"}],"version-history":[{"count":152,"href":"https:\/\/ventilation-maximum.com\/en\/wp-json\/wp\/v2\/posts\/14728\/revisions"}],"predecessor-version":[{"id":25269,"href":"https:\/\/ventilation-maximum.com\/en\/wp-json\/wp\/v2\/posts\/14728\/revisions\/25269"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ventilation-maximum.com\/en\/wp-json\/wp\/v2\/media\/14900"}],"wp:attachment":[{"href":"https:\/\/ventilation-maximum.com\/en\/wp-json\/wp\/v2\/media?parent=14728"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ventilation-maximum.com\/en\/wp-json\/wp\/v2\/categories?post=14728"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ventilation-maximum.com\/en\/wp-json\/wp\/v2\/tags?post=14728"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}