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jadnashua · 06-10-2019, 03:30 PM

OFten, that 1/4" ply underneath is something like a luan, or similar hardwood. That stuff has an oily substance in it that doesn't agree with cement based mortars. If it's a pine or fir, and you anchored it really well, you've got a chance. That's assuming that it's got C-faces or better...something you can't really tell at this point. A D-face will have voids, something you do NOT want in a tiled substrate.

06-10-2019, 03:30 PM	#5
jadnashua Veteran DIYer- Schluterville Graduate Senior Contributor Join Date: Jul 2004 Location: Nashua, NH Posts: 14,230	OFten, that 1/4" ply underneath is something like a luan, or similar hardwood. That stuff has an oily substance in it that doesn't agree with cement based mortars. If it's a pine or fir, and you anchored it really well, you've got a chance. That's assuming that it's got C-faces or better...something you can't really tell at this point. A D-face will have voids, something you do NOT want in a tiled substrate. __________________ Jim DeBruycker Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.