{"id":39368,"date":"2017-07-17T11:51:07","date_gmt":"2017-07-17T15:51:07","guid":{"rendered":"https:\/\/www.constructionspecifier.com\/?p=39368"},"modified":"2017-07-17T11:51:07","modified_gmt":"2017-07-17T15:51:07","slug":"considering-ira-with-brick-masonry","status":"publish","type":"post","link":"https:\/\/www.constructionspecifier.com\/considering-ira-with-brick-masonry\/","title":{"rendered":"Considering IRA with brick masonry"},"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\" \/> <span style=\"font-size: large;\"><strong><span style=\"color: #808080;\">FAILURES<\/span><\/strong><\/span><br \/>\n<strong>Deborah Slaton, and David S. Patterson, AIA<br \/>\n<\/strong>Apart from aesthetics, when brick is selected for new construction, test data provided by the manufacturer is often reviewed for strength, saturation coefficients, and perhaps efflorescence. Unfortunately, another important characteristic\u2014the initial rate of absorption (IRA)\u2014sometimes receives little attention. This is the metric for water absorbed by the brick unit in a limited time, primarily through its bed face. Using brick with a high IRA can have significant implications for design and detailing of fa\u00e7ades.<\/p>\n<p>ASTM C67-16, <em>Standard Test Methods for <\/em><em>Sampling and Testing Brick and Structural Clay Tile<\/em>, provides methods for determining IRA of brick, in both the laboratory and the field. A high IRA is generally considered to be above 0.0016 g\/min\/mm<sup>2<\/sup> (30 g\/min\/30 sq. in.). As noted in ASTM C216-17, <em>Standard Specification <\/em><em>for Facing Brick (Solid Masonry Units Made from <\/em><em>Clay or Shale)<\/em>:<\/p>\n<figure id=\"attachment_39372\" aria-describedby=\"caption-attachment-39372\" style=\"width: 356px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2017\/07\/feat1-8.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-39372 \" src=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2017\/07\/feat1-8.jpg\" alt=\"\" width=\"356\" height=\"178\" srcset=\"https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2017\/07\/feat1-8.jpg 600w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2017\/07\/feat1-8-300x150.jpg 300w, https:\/\/www.constructionspecifier.com\/wp-content\/uploads\/2017\/07\/feat1-8-500x250.jpg 500w\" sizes=\"auto, (max-width: 356px) 100vw, 356px\" \/><\/a><figcaption id=\"caption-attachment-39372\" class=\"wp-caption-text\"><span style=\"font-family: arial,helvetica,sans-serif; font-size: 10pt;\">An example of bond-line separations between mortar and brick in masonry wall, using brick with a high initial rate of absorption (IRA). <\/span><br \/> <span style=\"font-size: 10pt;\"><em><span style=\"font-family: arial,helvetica,sans-serif;\"> Photo courtesy David Patterson, AIA<\/span><\/em><\/span><\/figcaption><\/figure>\n<p><span style=\"font-family: courier new,courier,monospace;\">Both laboratory and field investigation have shown that strong and watertight joints between mortar and masonry units are not achieved by ordinary construction methods when the units laid have excessive initial rates of absorption.<\/span><\/p>\n<p>In newly laid masonry with high-IRA brick, water can be rapidly drawn from the mortar during drying, resulting in poor adhesion and incomplete bond between the brick and mortar. This leads to reduced flexural bond strength and bond-line separations that can adversely affect the masonry\u2019s ability to resist water penetration. To address this problem, ASTM C216 recommends units having a field IRA greater than 0.0016 g\/min\/mm<sup>2<\/sup> be thoroughly wetted three to 24 hours before installation. This reduces IRA and distributes moisture throughout the unit. (The standard also notes certain brick textures or coatings may affect IRA.)<\/p>\n<p>IRA also affects the selection of mortar. Brick Industry Association (BIA) Technical Note 8B, <em>Mortars for Brickwork\u2013Selection and Quality Assurance<\/em>, recommends mortar with greater ability to retain mixing water be used with high-IRA brick, and mortar with lesser ability to retain water be used with low-IRA brick. The technical note\u2019s Table 2 provides mortar recommendations based on brick unit IRA, generally leaning toward Type S mortar (per ASTM C270-14a, <em>Standard Specification for Mortar for Unit Masonry<\/em>) for brick with a low IRA, up to 0.0005 g\/min\/mm<sup>2<\/sup> (10 g\/min\/30 sq. in.), and Type N (also per ASTM C270) for brick with a high IRA, above 0.0016 g\/min\/mm<sup>2<\/sup>. Use of mortar or masonry cements is not recommended without testing for brick with high IRA that has not been sufficiently water-soaked before being laid.<\/p>\n<p>It is therefore important the specifier understand the physical characteristics of the brick when specifying mortars, and the specification clearly define pre-wetting requirements for the brick prior to installation.<\/p>\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 <em>The Construction Specifier<\/em> or CSI.<\/span><\/p>\n<p><em>Deborah Slaton is an architectural conservator and principal with Wiss, Janney, Elstner Associates (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 the Princeton, New Jersey, office of WJE, 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","protected":false},"excerpt":{"rendered":"<p>Apart from aesthetics, when brick is selected for new construction, test data provided by the manufacturer is often reviewed for strength, saturation coefficients, and perhaps efflorescence. Unfortunately, another important characteristic\u2014the initial rate of absorption (IRA)\u2014sometimes receives little attention.<\/p>\n","protected":false},"author":5,"featured_media":39372,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9,24],"tags":[3609,3610],"class_list":["post-39368","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-columns","category-failures","tag-brick-masonry","tag-ira","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Considering IRA with brick masonry - The Construction Specifier<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.constructionspecifier.com\/considering-ira-with-brick-masonry\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Considering IRA with brick masonry - The Construction Specifier\" \/>\n<meta property=\"og:description\" content=\"Apart from aesthetics, when brick is selected for new construction, test data provided by the manufacturer is often reviewed for strength, saturation coefficients, and perhaps efflorescence. 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