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Unread 11-23-2020, 08:58 AM   #2
ss3964spd
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Join Date: Jul 2005
Location: Fairfax, Va
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This the same project as your recent shower wall thickness post, Joe?

First off, you cannot install Durock directly on toppa sawn plank boards. Well, you can, but not according to Durock or probably the TCNA, both call for installation over plywood and, in your case, that plywood will need to be at least 1/2". The sawn planks are just too unstable, hence the need for plywood.

Regarding the toilet plate; I can't imagine what that's all about so a photo would sure be helpful. But in short, the actual toilet drain flange should rest solidly upon the finished floor, not the sub floor.
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