Floor Prep Questions Before Stone Tile Install
Hi, I have removed my plaster on 2 walls getting ready for new BR remodel. I have removed the fixtures and the old linoleum. Now there is glue residue that is covering the old T&G fir flooring that I wanted to keep as a subfloor. Last fall I asked this forum about prep for this floor and now need help getting some clarification on my plans.
I need to get my floor ready for tile and warming system. What I have planned is to keep the 3/4" diagonal subfloor & the 3/4" fir flooring, creating about 1.5" of subfloor. The wood is all old wood with nice grain. The joist at this point are 21" OC and I will be adding another joist between each of these. I will not sister these joist, nor will I use blocking. I will screw these joist into the diagonal subflooring. The long joist run about 10' free span. The width of the room is about 6.5'. There are 5 joist total. The joist become about 10" OC, I guess, after inserting the extra joist. The crawl space to do this will be inconvenient but can be done (I'm going to have my 21yo son do it).
So, now that I have the linoleum off. I was going to screw down 3/8" exterior grade plywood, into the top layering of flooring. I was not going to glue the plywood. I was not going to remove the old linoleum glue either. I was just going to make sure that the fir flooring was smooth before installing the plywood.
Then, having a nice surface to work with I will apply my electric floor warming system. I will cover this heating system with self leveling compound (SLC). I have read Staceyneal's post on this topic and will use her techniques that she learned from Mongoct, to seal any gaps, preventing escaping SLC. She had a great post on the use of SLC for her BR remodel.
Ditra applied over the SLC using modified thinset.
Install 12x6" slate tile with unmodified thinset over the Ditra.
1) Is my plan sound?
2) Is it ok to not remove the adhesive before putting in the plywood? I REALLY think it is TOO hard to remove this adhesive!
3) How close together do I need to space my screws on the plywood when I install it over my fir T&G?
4) Do I need to prep the plywood before the SLC?
5) Do I have the plumber come in and put in toilet, tub, and sink rough-ins before the SLC or after?
6) Have I missed something?
Thanks for taking the time to read this post. If you have input I would welcome it.