Jon as you may remember I also used 2 layers of backer board and brick patterned tile as a thermal barrier behind our wood stove
Never try to tell me it can't be done
When I have to paint I use KBS products
A few questions:
1. What was the thickness of the wood sub floor,was it plywood or 1x6 t&g?
2. Was the cement board installed over thinset as per installation instructions and screws every 8"?
Just because you have not had any problems does not change the fact that cement board does not have a structural rating.
I have been a tile installer for over 50 years including 26 years of my own business in NJ.
99% of floor tile installations were over plywood. Several things needed to followed for a proper installation.
1, A minimum of 1 1/4" exterior grade plywood at least B rating for top layer, 2, spaced 1/8" between sheets, 3, cleaned of all contaminants ( drywall dust, construction adhesive drywall compound) screwed every 8".
4, Use of a plywood rated mortar adhesive (incorrectly called thinset, thinset is a method not an adhesive) not the 12-13 dollar home depot crap.
When I moved to WV I worked for a tile contractor, His method for tile floors was 1/4" durock over 3/4" sub floor glued with construction adhesive and screwed.
I didn't think that was the correct method but he was the boss not me.
I don't know what The current (2020) Tile Council of America hand book says the requirements are for setting tile over plywood, First I don't have a copy and do not intend to buy one ($50.00) as I have been retired for 4 years and don't need one.
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