{"id":21950,"date":"2014-02-12T09:16:45","date_gmt":"2014-02-12T09:16:45","guid":{"rendered":"http:\/\/leedpoints.com\/?guid=45e3932659b674710b1a4a1d5445fabf"},"modified":"2014-02-12T09:16:45","modified_gmt":"2014-02-12T09:16:45","slug":"understanding-air-barriers-vapor-barriers-and-drainage-planes","status":"publish","type":"post","link":"https:\/\/leedpoints.com\/green-building-blog\/understanding-air-barriers-vapor-barriers-and-drainage-planes\/","title":{"rendered":"Understanding Air Barriers, Vapor Barriers, and Drainage Planes"},"content":{"rendered":null,"protected":false},"excerpt":{"rendered":"<div>\n<div>Subtitle:&nbsp;<\/div>\n<div>\n<div>\n                    These three terms refer to different materials that are easy to confuse        <\/div>\n<\/p><\/div>\n<\/div>\n<div>\n<div>Images:&nbsp;<\/div>\n<div>\n<div>\n                    <a href=\"http:\/\/www.greenbuildingadvisor.com\/blogs\/dept\/building-science\/understanding-air-barriers-vapor-barriers-and-drainage-planes\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.greenbuildingadvisor.com\/sites\/default\/files\/imagecache\/blog-river\/Liquid-applied%20WRB%20-%20Bailes%20-%202.jpg\" alt=\"\" title=\"Photo of a house with a liquid-applied membrane on the wall sheathing\" width=\"144\" height=\"108\"><\/a>        <\/div>\n<div>\n                    <a href=\"http:\/\/www.greenbuildingadvisor.com\/blogs\/dept\/building-science\/understanding-air-barriers-vapor-barriers-and-drainage-planes\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.greenbuildingadvisor.com\/sites\/default\/files\/imagecache\/blog-river\/paint-peeling-old-house-insulation-moisture-water_0.jpg\" alt=\"\" title=\"Peeling paint\" width=\"144\" height=\"108\"><\/a>        <\/div>\n<\/p><\/div>\n<\/div>\n<p>Is housewrap a vapor barrier? What&#8217;s the purpose of <span>building paper<\/span><span>Typically referring to Grade D building paper, this product is an asphalt-impregnated kraft paper that looks a lot like a lightweight asphalt felt. The Grade D designation has come to mean that the building paper passes ASTM D779 (minimum 10-minute rating with the &ldquo;boat test&rdquo;) and different products are called out as &ldquo;30-minute&rdquo; or even &ldquo;60-minute&rdquo; based on D779 results. At times confused with roofing felt, roofing felts and building paper differ in two ways: felts are made of recycled-content paper, building papers of virgin paper; felts are made of a heavier stock paper; building papers a lighter stock. See also roofing felt.<\/span>? <a href=\"http:\/\/youtu.be\/lIPan-rEQJA\" title=\"Who'll stop the rain?\">Who&#8217;ll stop the rain?<\/a> I&#8217;ve covered this topic in various forms before, but the confusion about what the different building materials do is so widespread that I have to keep coming back to it.<\/p>\n<p>I&#8217;m going to keep it simple here so maybe we can get a few more people to use the proper terms, and especially to know when not to use the term &ldquo;vapor barrier&rdquo; &#8230; and when <em>not<\/em> to use it.<\/p><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[5832,12479,12480,10022,12337,12481,10026],"class_list":["post-21950","post","type-post","status-publish","format-standard","hentry","category-green-building-posts","tag-air-barrier","tag-control-layer","tag-drainage-plane","tag-housewrap","tag-vapor-barrier","tag-water-resistive-barrier","tag-wrb"],"_links":{"self":[{"href":"https:\/\/leedpoints.com\/green-building-blog\/wp-json\/wp\/v2\/posts\/21950","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/leedpoints.com\/green-building-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/leedpoints.com\/green-building-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/leedpoints.com\/green-building-blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/leedpoints.com\/green-building-blog\/wp-json\/wp\/v2\/comments?post=21950"}],"version-history":[{"count":0,"href":"https:\/\/leedpoints.com\/green-building-blog\/wp-json\/wp\/v2\/posts\/21950\/revisions"}],"wp:attachment":[{"href":"https:\/\/leedpoints.com\/green-building-blog\/wp-json\/wp\/v2\/media?parent=21950"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/leedpoints.com\/green-building-blog\/wp-json\/wp\/v2\/categories?post=21950"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/leedpoints.com\/green-building-blog\/wp-json\/wp\/v2\/tags?post=21950"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}