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Old 12-26-2017, 07:27 PM   #1
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Join Date: Oct 2014
Posts: 105
Subfloor newbie questions

Hi, I searched the net and browsed some books and I'm having trouble finding the basics of how to do a subfloor.


I have some tongue and groove planks in a 25 sq. foot bathroom that I am going to put 3/4" exterior-grade plywood over. I'm going to use 1 5/8" exterior screws. Then I'm going to check for dips and use a self-leveling compound. Then I will install Ditra over that and then some 30 x 61 cm rectangular tiles.


1) I am going to leave a 1/4" expansion joint between the sheets and the walls. Is that good?

2) Do I need to put some sort of a mortar over the plywood screws and seams?

3) We are getting a new threshold. Do I remove the current one now and put plywood and Ditra under where the new one will go? I haven't purchased the new one yet but I can if needed.

I'm sure there will be more questions to come. Thanks!

Last edited by ksieburg; 12-27-2017 at 12:06 AM.
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