{"id":4842,"date":"2014-08-01T10:20:21","date_gmt":"2014-08-01T14:20:21","guid":{"rendered":"http:\/\/www.constructionspecifier.com\/?p=4842"},"modified":"2016-12-20T15:11:34","modified_gmt":"2016-12-20T20:11:34","slug":"wrb","status":"publish","type":"post","link":"https:\/\/www.constructionspecifier.com\/wrb\/","title":{"rendered":"WRB: Water (or weather?)-resistive barrier"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-569 alignleft\" src=\"http:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2013\/08\/slaton.jpg\" alt=\"slaton\" width=\"100\" height=\"104\" \/> <img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-571 alignleft\" src=\"http:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2013\/08\/patterson.jpg\" alt=\"patterson\" width=\"100\" height=\"104\" \/> <img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-570 alignleft\" src=\"http:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2013\/08\/sutterlin.jpg\" alt=\"sutterlin\" width=\"100\" height=\"104\" \/><span style=\"font-size: large;\"><strong><span style=\"color: #808080;\">FAILURES<\/span><\/strong><\/span><br \/>\n<strong>Deborah Slaton, David S. Patterson, AIA, and Jeffrey N. Sutterlin, PE<br \/>\n<\/strong>Using the acronym \u2018WRB\u2019 is common, but the intended meaning is often misunderstood, as it can refer to either a \u2018water\u2019 or \u2018weather\u2019-resistive barrier, with the two having different performance expectations.<\/p>\n<p>The 2012 <em>International Building Code <\/em>(<em>IBC<\/em>), Section 1403.2?Weather Protection requires exterior walls \u201cprovide a building with a weather-resistant exterior wall envelope\u2026designed and constructed\u2026 to prevent the accumulation of water within the wall assembly by providing a water-resistive barrier behind the exterior veneer.\u201d Water-resistive barriers are defined in Section 1404.2 as \u201ca minimum of one layer of No. 15 asphalt felt, complying with ASTM D226, <em><span class=\"st\">Standard Specification for Asphalt-saturated Organic Felt Used in Roofing and Waterproofing<\/span><\/em>, for Type 1 felt or other approved materials\u2026to provide a continuous water-resistive barrier behind the exterior wall veneer.\u201d<\/p>\n<p>For adhered stone veneers, Section 1405.10.1.1 requires water-resistive barriers to be installed per section 2510.6, which in turn directs the reader back to Section 1404.2, but adds the requirement the water-resistive barrier be vapor-permeable with the equivalent performance of two layers of Grade D paper when applied over wood-based sheathing. (Section 2510.6 of the 2015 <em>IBC<\/em> has been revised to require a vapor-permeable barrier with performance at least equivalent to two layers of a water-resistive barrier complying with Type I of ASTM E2556, <em><span class=\"st\">Standard Specification for Vapor Permeable Flexible Sheet Water-<wbr \/>resistive Barriers Intended for Mechanical Attachment<\/span><\/em>, which includes polymer-based barriers.) It should be noted <em>IBC<\/em>\u2019s Chapter 14?Exterior Walls does not reference weather-resistive barriers.<\/p>\n<p>The American Architectural Manufacturers Association (AAMA) defines weather-resistant (not \u2018resistive\u2019) barriers as a surface or a wall responsible for preventing air and water infiltration to the building interior. Manufacturers of polymer-based barriers (<em>i.e.<\/em> building wraps) also distinguish between water-resistive and weather-resistive barriers, with the latter providing the added benefit of also serving as an air barrier for the vertical building enclosure.<\/p>\n<p>While not as potentially destructive as bulk water leakage, moisture transport via air infiltration can contribute to moisture-related problems in the building enclosure. Weather-resistive barriers are often more robust as compared to water-resistive barriers and require taping of all laps and terminations to resist not only water penetration, but also air infiltration.<\/p>\n<p>Code-mandated water-resistive barriers are typically limited to residential and low-rise structures, while weather-resistive barriers are commonly specified for commercial buildings or projects where a higher level of performance is desired of the vertical building enclosure and control of interior environmental conditions is critical.<\/p>\n<p>It is important the design professional and installer understand the intended purpose of the specified WRB\u2014to resist water or to resist air and water\u2014as the installation varies between the two types of barriers. However, regardless of whether the WRB is intended to function as a water- or weather-resistive barrier, the WRB must be properly installed so as to maintain continuity of the barrier. This requires the WRB to be properly integrated with flashings, wall openings, and all adjacent enclosure assemblies, and to be sufficiently overlapped, correctly shingled, and properly sealed or taped at exposed laps (horizontal and\/or vertical, depending on its intended purpose), as barrier discontinuities result in potential entry points for water (and air) to migrate into the building.<\/p>\n<div style=\"clear: both;\"><\/div>\n<p><span style=\"color: #999999;\">The opinions expressed in Failures are based on the authors\u2019 experiences and do not necessarily reflect those of the CSI or <em>The Construction Specifier<\/em>.<\/span><\/p>\n<p><em>Deborah Slaton is an architectural conservator and principal with Wiss, Janney, Elstner Associates, Inc. (WJE) in Northbrook, Illinois, specializing in historic preservation and materials conservation. She can be reached at <a href=\"mailto:dslaton@wje.com\">dslaton@wje.com<\/a>.<\/em><\/p>\n<p><em>David S. Patterson, AIA, is an architect and senior principal with WJE\u2019s Princeton, New Jersey, office, specializing in investigation and repair of the building envelope. He can be e-mailed at <a href=\"mailto:dpatterson@wje.com\">dpatterson@wje.com<\/a>.<\/em><\/p>\n<p><em>Jeffrey N. Sutterlin is an architectural engineer and senior associate with WJE\u2019s Princeton office, specializing in investigation and repair of the building envelope. He can be contacted via e-mail at <a href=\"mailto:jsutterlin@wje.com\">jsutterlin@wje.com<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Using the acronym \u2018WRB\u2019 is common, but the intended meaning is often misunderstood, as it can refer to either a \u2018water\u2019 or \u2018weather\u2019-resistive barrier, with the two having different performance expectations.<\/p>\n","protected":false},"author":2,"featured_media":23515,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9,179,187,265,24],"tags":[547,1081,908],"class_list":["post-4842","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-columns","category-masterformat","category-07-00-00-thermal-and-moisture-protection","category-07-25-00-weather-barriers","category-failures","tag-water-resistive-barrier","tag-weather-resistive","tag-wrb","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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