{"id":2206,"date":"2026-06-21T03:19:28","date_gmt":"2026-06-21T03:19:28","guid":{"rendered":"https:\/\/unitedperfect.com\/?p=2206"},"modified":"2026-06-22T08:33:04","modified_gmt":"2026-06-22T08:33:04","slug":"how-housewrap-works-inside-a-wall-assembly","status":"publish","type":"post","link":"https:\/\/unitedperfect.com\/es\/how-housewrap-works-inside-a-wall-assembly\/","title":{"rendered":"How Housewrap Works Inside a Wall Assembly"},"content":{"rendered":"<h1 class=\"wp-block-heading\">How Housewrap Works Inside a Wall Assembly<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Understanding the Role of WRBs in Modern Building Envelope Systems<\/h2>\n\n\n\n<p>When builders talk about Housewrap, many people simply think of it as a protective layer installed behind exterior siding.<\/p>\n\n\n\n<p>However, modern Housewrap products do much more than stop rain.<\/p>\n\n\n\n<p>They play a critical role in moisture management, wall durability, and overall building performance.<\/p>\n\n\n\n<p>To understand why Housewrap is important, we first need to understand how a modern wall assembly works.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/e5d2c8e0-87ea-46c2-aa2a-54e6020c39d5-1024x683.png\" alt=\"\" class=\"wp-image-2174\" srcset=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/e5d2c8e0-87ea-46c2-aa2a-54e6020c39d5-1024x683.png 1024w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/e5d2c8e0-87ea-46c2-aa2a-54e6020c39d5-300x200.png 300w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/e5d2c8e0-87ea-46c2-aa2a-54e6020c39d5-768x512.png 768w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/e5d2c8e0-87ea-46c2-aa2a-54e6020c39d5-18x12.png 18w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/e5d2c8e0-87ea-46c2-aa2a-54e6020c39d5-200x133.png 200w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/e5d2c8e0-87ea-46c2-aa2a-54e6020c39d5-600x400.png 600w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/e5d2c8e0-87ea-46c2-aa2a-54e6020c39d5.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What Is a Wall Assembly?<\/h1>\n\n\n\n<p>A wall assembly is a complete wall system made up of multiple layers that work together to protect the building.<\/p>\n\n\n\n<p>A typical North American wall assembly consists of:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Exterior Cladding<\/h3>\n\n\n\n<p>(Siding, Brick, Metal Panels, Fiber Cement, etc.)<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Housewrap \/ WRB<\/h3>\n\n\n\n<p>(Weather-Resistive Barrier)<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sheathing<\/h3>\n\n\n\n<p>(OSB or Plywood)<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Insulation<\/h3>\n\n\n\n<p>(Fiberglass, Mineral Wool, Foam, etc.)<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Interior Drywall<\/h3>\n\n\n\n<p>Each layer has a specific purpose.<\/p>\n\n\n\n<p>The Housewrap layer serves as one of the most important components in protecting the wall system.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/be1749dc-e034-41f8-b282-be43a8a22d33-1024x683.png\" alt=\"\" class=\"wp-image-2153\" srcset=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/be1749dc-e034-41f8-b282-be43a8a22d33-1024x683.png 1024w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/be1749dc-e034-41f8-b282-be43a8a22d33-300x200.png 300w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/be1749dc-e034-41f8-b282-be43a8a22d33-768x512.png 768w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/be1749dc-e034-41f8-b282-be43a8a22d33-18x12.png 18w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/be1749dc-e034-41f8-b282-be43a8a22d33-200x133.png 200w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/be1749dc-e034-41f8-b282-be43a8a22d33-600x400.png 600w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/be1749dc-e034-41f8-b282-be43a8a22d33.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">What Does Housewrap Actually Do?<\/h1>\n\n\n\n<p>Many people believe Housewrap is simply a waterproof membrane.<\/p>\n\n\n\n<p>In reality, a high-performance WRB performs multiple functions simultaneously.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Stops Rainwater<\/h3>\n\n\n\n<p>Housewrap helps prevent wind-driven rain from reaching the wall sheathing and insulation.<\/p>\n\n\n\n<p>This protects structural components from water damage.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Allows Moisture Vapor to Escape<\/h3>\n\n\n\n<p>Buildings generate moisture every day through:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cooking<\/li>\n\n\n\n<li>Showering<\/li>\n\n\n\n<li>Laundry<\/li>\n\n\n\n<li>HVAC Operation<\/li>\n\n\n\n<li>Human Activity<\/li>\n<\/ul>\n\n\n\n<p>If moisture becomes trapped inside the wall cavity, problems can occur.<\/p>\n\n\n\n<p>High-quality Housewrap allows water vapor to escape while blocking liquid water.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Keep Water Out.<\/h3>\n\n\n\n<h3 class=\"wp-block-heading\">Let Walls Breathe.<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/8258bc2f-c908-4868-b9eb-a9056ec70e54-1024x683.png\" alt=\"\" class=\"wp-image-2213\" srcset=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/8258bc2f-c908-4868-b9eb-a9056ec70e54-1024x683.png 1024w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/8258bc2f-c908-4868-b9eb-a9056ec70e54-300x200.png 300w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/8258bc2f-c908-4868-b9eb-a9056ec70e54-768x512.png 768w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/8258bc2f-c908-4868-b9eb-a9056ec70e54-18x12.png 18w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/8258bc2f-c908-4868-b9eb-a9056ec70e54-200x133.png 200w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/8258bc2f-c908-4868-b9eb-a9056ec70e54-600x400.png 600w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/8258bc2f-c908-4868-b9eb-a9056ec70e54.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Supports Long-Term Wall Durability<\/h3>\n\n\n\n<p>Dry walls last longer.<\/p>\n\n\n\n<p>By helping wall assemblies remain dry, Housewrap contributes to:<\/p>\n\n\n\n<p>\u2714 Reduced Mold Risk<\/p>\n\n\n\n<p>\u2714 Reduced Condensation<\/p>\n\n\n\n<p>\u2714 Better Insulation Performance<\/p>\n\n\n\n<p>\u2714 Longer Building Life<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Why Moisture Management Matters<\/h1>\n\n\n\n<p>Modern building science has changed significantly over the past decade.<\/p>\n\n\n\n<p>The biggest threat to many wall systems is no longer rain penetration.<\/p>\n\n\n\n<p>It is trapped moisture.<\/p>\n\n\n\n<p>When vapor cannot escape, it may cause:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mold Growth<\/li>\n\n\n\n<li>Wood Rot<\/li>\n\n\n\n<li>Insulation Failure<\/li>\n\n\n\n<li>Structural Deterioration<\/li>\n<\/ul>\n\n\n\n<p>This is why vapor permeability has become one of the most important WRB performance indicators.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/a3e74a75-9d73-487c-9245-23286d4b82fa-1024x683.png\" alt=\"\" class=\"wp-image-2169\" srcset=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/a3e74a75-9d73-487c-9245-23286d4b82fa-1024x683.png 1024w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/a3e74a75-9d73-487c-9245-23286d4b82fa-300x200.png 300w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/a3e74a75-9d73-487c-9245-23286d4b82fa-768x512.png 768w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/a3e74a75-9d73-487c-9245-23286d4b82fa-18x12.png 18w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/a3e74a75-9d73-487c-9245-23286d4b82fa-200x133.png 200w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/a3e74a75-9d73-487c-9245-23286d4b82fa-600x400.png 600w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/a3e74a75-9d73-487c-9245-23286d4b82fa.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Choosing the Right Housewrap for Your Wall Assembly<\/h1>\n\n\n\n<p>Different wall systems require different levels of performance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">PP Woven Housewrap<\/h3>\n\n\n\n<p>Cost-effective protection for residential construction.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Breathable Housewrap<\/h3>\n\n\n\n<p>Improved vapor permeability and moisture management.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Fire-Retardant Breathable Housewrap<\/h3>\n\n\n\n<p>Adds fire safety and UV resistance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">PVEK-B1060 Flash-Spun HDPE WRB<\/h3>\n\n\n\n<p>Premium wall protection solution.<\/p>\n\n\n\n<p>Verified Performance:<\/p>\n\n\n\n<p>\u2714 SGS WI W1 Class<\/p>\n\n\n\n<p>\u2714 SD &lt; 0.2m<\/p>\n\n\n\n<p>\u2714 Excellent Water Resistance<\/p>\n\n\n\n<p>\u2714 High Vapor Permeability<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/acf8b52a-4003-4257-963c-750a4a00ea5c-1024x683.png\" alt=\"\" class=\"wp-image-2065\" srcset=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/acf8b52a-4003-4257-963c-750a4a00ea5c-1024x683.png 1024w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/acf8b52a-4003-4257-963c-750a4a00ea5c-300x200.png 300w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/acf8b52a-4003-4257-963c-750a4a00ea5c-768x512.png 768w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/acf8b52a-4003-4257-963c-750a4a00ea5c-18x12.png 18w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/acf8b52a-4003-4257-963c-750a4a00ea5c-200x133.png 200w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/acf8b52a-4003-4257-963c-750a4a00ea5c-600x400.png 600w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/acf8b52a-4003-4257-963c-750a4a00ea5c.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">PVEK-B2066 Fire-Retardant Flash-Spun HDPE WRB<\/h3>\n\n\n\n<p>Combines:<\/p>\n\n\n\n<p>\u2714 Flash-Spun HDPE Technology<\/p>\n\n\n\n<p>\u2714 Fire Retardancy<\/p>\n\n\n\n<p>\u2714 Moisture Management<\/p>\n\n\n\n<p>\u2714 Long-Term Durability<\/p>\n\n\n\n<p>For demanding building envelope projects.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"731\" src=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/ChatGPT-Image-2026\u5e746\u67088\u65e5-17_52_17-1024x731.png\" alt=\"\" class=\"wp-image-2093\" srcset=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/ChatGPT-Image-2026\u5e746\u67088\u65e5-17_52_17-1024x731.png 1024w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/ChatGPT-Image-2026\u5e746\u67088\u65e5-17_52_17-300x214.png 300w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/ChatGPT-Image-2026\u5e746\u67088\u65e5-17_52_17-768x549.png 768w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/ChatGPT-Image-2026\u5e746\u67088\u65e5-17_52_17-18x12.png 18w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/ChatGPT-Image-2026\u5e746\u67088\u65e5-17_52_17-200x143.png 200w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/ChatGPT-Image-2026\u5e746\u67088\u65e5-17_52_17-600x429.png 600w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/ChatGPT-Image-2026\u5e746\u67088\u65e5-17_52_17.png 1484w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Why Builders Are Upgrading Their WRB Systems<\/h1>\n\n\n\n<p>As energy-efficiency standards continue to rise across North America, Europe, and Australia, builders are paying closer attention to wall drying performance and moisture control.<\/p>\n\n\n\n<p>A modern Housewrap is no longer just a weather barrier.<\/p>\n\n\n\n<p>It is an essential part of a high-performance Building Envelope System.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Why Global Buyers Choose OPERFECT<\/h1>\n\n\n\n<p>OPERFECT provides complete Wall Protection Solutions for modern construction projects.<\/p>\n\n\n\n<p>Our WRB family includes:<\/p>\n\n\n\n<p>PP Woven Housewrap<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<p>Breathable Housewrap<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<p>Fire-Retardant Breathable Housewrap<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<p>PVEK-B1060 Flash-Spun HDPE WRB<\/p>\n\n\n\n<p>\u2193<\/p>\n\n\n\n<p>PVEK-B2066 Fire-Retardant Flash-Spun HDPE WRB<\/p>\n\n\n\n<p>Helping builders, distributors, and private-label brands select the right solution for every wall assembly.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/08e0b68a-0e31-4b8f-ba49-054be8f52b24-1024x576.png\" alt=\"\" class=\"wp-image-2185\" srcset=\"https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/08e0b68a-0e31-4b8f-ba49-054be8f52b24-1024x576.png 1024w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/08e0b68a-0e31-4b8f-ba49-054be8f52b24-300x169.png 300w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/08e0b68a-0e31-4b8f-ba49-054be8f52b24-768x432.png 768w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/08e0b68a-0e31-4b8f-ba49-054be8f52b24-1536x864.png 1536w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/08e0b68a-0e31-4b8f-ba49-054be8f52b24-18x10.png 18w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/08e0b68a-0e31-4b8f-ba49-054be8f52b24-200x113.png 200w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/08e0b68a-0e31-4b8f-ba49-054be8f52b24-600x338.png 600w, https:\/\/unitedperfect.com\/wp-content\/uploads\/2026\/06\/08e0b68a-0e31-4b8f-ba49-054be8f52b24.png 1672w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Conclusion<\/h1>\n\n\n\n<p>Housewrap is far more than a protective sheet behind siding.<\/p>\n\n\n\n<p>It plays a critical role in water resistance, vapor management, energy efficiency, and long-term building durability.<\/p>\n\n\n\n<p>Understanding how Housewrap works inside a wall assembly is the first step toward creating healthier, more durable, and higher-performing buildings.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Contact Our Global Team<\/h2>\n\n\n\n<p class=\"has-luminous-vivid-orange-color has-text-color has-link-color has-medium-font-size wp-elements-c2695de03a2e301cf8a6021e0cdf4268\">United Perfect Group\uff0cTo Make Buildings Perfect, together.<\/p>\n\n\n\n<p>Building Envelope Protection Systems Manufacturer<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Roofing Protection \u2022 Wall Protection \u2022 Thermal Protection \u2022 Insulation Systems<\/p>\n\n\n\n<p>Global Business Director: Mr. Du<\/p>\n\n\n\n<p>WhatsApp \/ WeChat: +86 134 2613 0536<\/p>\n\n\n\n<p>Correo electr\u00f3nico: <a href=\"mailto:export@unitedperfect.com\">export@unitedperfect.com<\/a><\/p>\n\n\n\n<p>P\u00e1gina web: <a href=\"https:\/\/unitedperfect.com\/es\/\">www.unitedperfect.com<\/a><\/p>\n\n\n\n<p>Products: <a href=\"https:\/\/unitedperfect.com\/es\/producto\/operfect-building-envelope-protection-systems\/\">OPERFECT Building Envelope Protection Systems &#8211; Manufacturer of foil lamination, Roofing &amp; walling, Insulation &amp; acoustic, Fiberglass .<\/a><\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>How Housewrap Works Inside a Wall Assembly Understanding the Role of WRBs in Modern Building Envelope Systems When builders talk about Housewrap, many people simply think of it as a protective layer installed behind exterior siding. However, modern Housewrap products do much more than stop rain. They play a critical role in moisture management, wall [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2166,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[102],"tags":[],"class_list":["post-2206","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge-center"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"How Housewrap Works Inside a Wall Assembly Understanding the Role of WRBs in Modern Building Envelope Systems When builders talk about Housewrap, many people simply think of it as a protective layer installed behind exterior siding. However, modern Housewrap products do much more than stop rain. 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