{"id":541,"date":"2019-04-30T15:29:49","date_gmt":"2019-04-30T15:29:49","guid":{"rendered":"http:\/\/www.tilebar.com\/learn\/?p=541"},"modified":"2024-01-25T09:26:19","modified_gmt":"2024-01-25T09:26:19","slug":"a-guide-to-addressing-large-porcelain-challenges","status":"publish","type":"post","link":"https:\/\/wpstage.tilebar.com\/learn\/a-guide-to-addressing-large-porcelain-challenges\/","title":{"rendered":"Cause & Cure: A Guide To Addressing Large Porcelain Challenges"},"content":{"rendered":"\n

The NTCA Reference Manual is an important industry document that approaches challenges in the field from a problem\/cause\/cure format. The comprehensive culmination of knowledge, research, development and publication of the efforts of the NTCA Technical Committee <\/a>addresses many problems that arise in the field, how to prevent them or address them when they occur. Today we look at the chapter on Large Porcelain and Glass Bodied Tiles, appearing in Chapter 6, page 124 in the 2016-2017 version<\/em>. <\/em><\/strong> <\/em>
<\/p>\n\n\n\n

The Problem, Defined.<\/h2>\n\n\n\n

Loss of bond between bond coat and large porcelain tiles <\/a>or tiles containing high percentage of glass in the body. Tiles may come off mortar bond coat clean, even with full coverage on backs of tiles.<\/p>\n\n\n\n

The Cause, Found.<\/h2>\n\n\n\n

\u2022 Inadequate contact between mortar bond coat and backs of tiles which may be caused by improper beat-in and using inadequate amounts of mortar, or worn or improper trowels.<\/p>\n\n\n\n

\u2022 Use of pure cement bond coat over\nplastic mortar beds.<\/p>\n\n\n\n

\u2022 Use of dry-set mortar without\nlatex additives.<\/p>\n\n\n\n

\u2022 Presence of excessive white\npowder (manufacturer\u2019s release agent) on back of tile.<\/p>\n\n\n\n

\u2022 Bending or deflection of substrates.<\/p>\n\n\n\n

\u2022 Differential expansion between\ntile and setting material.<\/p>\n\n\n\n

\u2022 Working on or too early traffic\non newly-laid tile floors.<\/p>\n\n\n\n

\u2022 Shrinkage or setting of\nsubstrates due to changes of moisture in structure or movements in the\nstructure after construction is complete.<\/p>\n\n\n\n

\u2022 Improperly engineered structure for\nthe installation put into place.<\/p>\n\n\n\n

The Cure.<\/h2>\n\n\n\n

Any of the following may prevent problems with large porcelain and glass-bodied tiles.<\/a><\/em><\/p>\n\n\n\n

\u2022 To secure good contact between tiles and ribs of latex-Portland cement mortar, tiles must be pushed and slid into the mortar using NTCA recommendations for bedding tiles. Backbuttering tiles with a thin, flat coat of latex-Portland cement mortar helps develop a better bond to the tile.<\/p>\n\n\n\n

\u2022 On large format tile<\/a>, a box screen has proven to be an excellent means of controlling the amount of mortar applied to the back side of large tiles. Latex-Portland cement mortar applied to the substrate should be troweled out evenly in one direction \u2013 not swirled \u2013 with notched trowels. Ribbed mortar on only one surface helps reduce voids and air pockets. This method also produces a smoother, more even surface than conventional backbuttering, which often leaves tiles with excessive lippage.<\/p>\n\n\n\n

\u2022 Successful installations of large\nporcelain and glass-bodied tiles require the use of a manufacturer\u2019s\nrecommended latex-Portland cement mortar that meets or exceeds ANSI\nspecifications. Use latex-Portland cement mortars that are more flexible, in\naddition to having superior bonding capability. Latex-Portland cement mortars bond\nlarge porcelain tiles and tiles containing glass in the body, better than more\nconventional mortars. Mortar flexibility helps bridge stresses created between\nsubstrates and large, unforgiving tiles, reducing possibility of tiles shearing\noff. Check with manufacturer for exact products recommended.<\/p>\n\n\n\n

\u2022 Press or slide tiles into\nposition using NTCA recommendations for bedding tiles. Check to see that uniform\ncontact is being achieved at corners, edges, and the back of the tiles by pulling\ntile up for examination. Beating-in only<\/em><\/strong> of larger tiles generally is\nnot effective. Average contact area shall not be less than 80% except on\nexterior or wet area installations (see TCNA\nHandbook<\/em> for wet area definition) where contact area shall be 95% when not less\nthan three tiles or tile assemblies are removed for inspection.<\/p>\n\n\n\n

\u2022 Check tiles for presence of excessive\nwhite powder (manufacturer\u2019s release agent) on back of tile. If necessary,\nbrush or remove white powder before attempting to bond tile.<\/p>\n\n\n\n

\u2022 Porcelain tiles have extremely low\nwater absorption rates. As a result, the setting time of many latex-Portland\ncement mortars may be extended. Therefore, working on or exposing the\ninstallation to traffic prior to a good bond forming may result in poor\nperformance of the completed job.<\/p>\n\n\n\n

\u2022 Proceed with caution when installing\nlarge porcelain tiles over substrates subject to bending or deflection. When\ninstalling materials with special or unique properties, the code minimum may\nnot be sufficient to provide satisfactory performance. Each project presents its\nown conditions; consult with owner or builder to determine if any modifications\nto the structure can be done prior to the installation when you suspect\nproblems or have concerns.<\/p>\n\n\n\n

\u2022 Web floor trusses and engineered I-joists\nare used in ways that weren\u2019t possible with traditionally sawn lumber. Be aware\nof the conditions you face prior to installation so adjustments can be made if\nnecessary. See NTCA\u2019s document on Installations\nover Engineered Wood<\/em> Products<\/em> for\nadditional information.<\/p>\n\n\n\n

\u2022 Require architect or construction\nmanager to locate movement joints in tile work as recommended in the TCNA Handbook<\/em>. Design, locations,\nspacing, and actual installation must conform to requirements in the TCNA Handbook<\/em> and ANSI Standards.\nMovement joint recommendations apply to residential construction as well as commercial\nand industrial construction.<\/p>\n\n\n\n

\u2022 When faced with installation of large\nporcelain tiles or tiles with glass in the body, insist on using latex-modified\nPortland cement mortars when they are not specified. Also, require mortar\nmanufacturers to furnish test results showing bonding and flexural capabilities\nof mortars and bondability of tiles from tile manufacturers.<\/p>\n\n\n\n

In the Interior Design world? Join our VIP Trade Program and you can enjoy a ton of perks like special discounts and volume pricing, to name a few. <\/strong><\/h4>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n

Reprinted with permission from TileLetter May 2017 issue. Visit TileLetter.com<\/a> for more information. <\/em><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

There are some common issues you could run into with large porcelain tiles and glass body tiles. Learn the causes and cures in this post. <\/p>\n","protected":false},"author":1,"featured_media":551,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[21],"tags":[411,392,356,86],"class_list":["post-541","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pros","tag-diy-tips","tag-large-format-tile","tag-porcelain-ceramic-tile","tag-tile-advice"],"acf":[],"yoast_head":"\nA Guide To Addressing Large Porcelain Tile Challenges - Tileist by Tilebar<\/title>\n<meta name=\"description\" content=\"There are some common issues you could run into with large porcelain tiles and glass body tiles. 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