(19 mm) thick on horizontal applications. VersaBond is a professional formula, all-purpose mortar, polymer-modified to provide good ... underlayment surfaces to receive RedGard must be primed with properly applied sealer or a primer coat of RedGard, consisting of 1 part ... Backerboard may be installed over plywood subfloors. VersaBond LFT is a non-slump mortar that can be troweled up to three quarters of an inch deep for floor applications. mike says. RedGuard or thin plywood backerboard over OSB? VersaBond-LFT Fortified Medium Bed Mortar is a general purpose, economical, polymer-modified medium bed mortar for use with large format porcelain, ceramic and natural stone tile. i’ve done as much reading as i can and decided to just ask people who know what they are talking about . Using it to attach the tiles is a different thing. VersaBond cures quickly and adheres to most surfaces. It's recommended for waterproofing niches, shelves, and entire shower walls when tar paper or poly are not used as a vapor barrier behind the CBU. I want to be as cost effective as possible as these projects get expensive (as everyone knows). fall off in time if he installed over Redgard. I haven’t done the testing yet on the mosaic, but if goes ok, I thought of 2 options for installing the Ditra: With a non-slumping formula to eliminate lippage, Versabond-LFT can be applied to … Fortified Thin-Set Mortar is a professional formula, all-purpose mortar, polymer-modified to provide good bond strengths. When I started reading Redgard fact sheets carefully, indeed, they ... Versabond would do the job with no more effort and less cost :scratch: Don. Versabond-LFT professional medium bed mortar is a non-sag, nonslump, polymer modified mortar for use with large format porcelain, ceramic and natural stone tile. With a non-slumping formula to eliminate lippage, VersaBond-LFT can be applied to 3/4 in. With no or little air intrusion, it takes much longer to cure. Actually I don't see the word horizontal in the technical sheet for Versabond but I would still use Flexbond because of the higher polymer content. So I have 3/4" OSB subfloor in a bathroom and I need to put down some tile. I am in Wisconsin and tiling a outside wall in a DIY shower remodel. As to the question of Versabond, it works well using it over Hardi as the Hardi "breaths" and the air penetration allows the Versabond to cure properly. For a drywall (gypsum) substrate, one needs to use one of the waterproofing membranes like Custom Building Product's Red Guard. Is this true and do you guys have experience (some long-term data) with installing wall tiles over Redgard in a shower? Make no mistake, it'll work quite well...just takes longer to set up. Next, the installer keys in a burn coat of mortar to the substrate. White Fortified Thinset Mortar The Custom Building Products VersaBond 50 The Custom Building Products VersaBond 50 lbs. I already have 1/4" cement board and versabond thinset. Reply. Refer to product data sheets for installation information. You''ll be fine with thinset over Redguard on walls. To begin, this 24-inch tile is backbuttered, just as it should be on a jobsite. I plan on removing existing vapor barrier and applying Redgard over 1/2" cement board. 01-02-2017, 10:12 PM. Otherwise, Ultraflex 2 or Laticrete 253 gold are good choices also. It's recommended for waterproofing niches, shelves, and entire shower walls when tar paper or poly are not used as a vapor barrier behind the CBU. Wildo. January 26, 2019 at 12:51 pm. I like Versabond Flex over Redgard because they are the same brand. VersaBond 50 lb. VersaBond-LFT is specially formulated for large format tiles. Much reading as i can and decided to just ask people who know what they talking! 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