 chmodPremium
join:2000-12-12
Lockport, IL | reply to PeeWee
Re: Pop from tile floor said by PeeWee:said by robbin:Correct -- it should have been 3/4" over the diagonal subfloor. Basically tile installation specs don't allow for 3/8" as a subfloor material no matter what it is over. The diagonal material is sub-floor the 3/8 material would be called underlayment and can be any thickness. The purpose of underlayment is to eliminate voids and give a smoother surface (as in non-structural). While I agree 3/8 apa rated wood underlayment gapped an 1/8" on long and butt seams is a acceptable substrate to put tile down on, I dont think I would put that over dimensional lumber ie 1x's on a 45 (which my house has). Also, no matter how many layers of underlayment + subfloor you have I wouldn't use anything less than 3/8 for a ceramic install. We use 1/4" hardibacker for fireplace surrounds but high traffic floor areas 3/8 to 1/2" apa rated plywood glued and stapled every 1.5inches on the perimeter of the sheet and 4-6inches in the field.
I don't claim to be a ceramic guru by any means more vinyl than anything. But I install a lot and I mean alot of underlayment for ceramic crews for one of the stores I work for. As for 3/8 or 1/2 like you mentioned it depends on the product its mating up against to. 3/8 for hardwood installations makes a smooth grouted transition. 1/2 is used more on second floors in new construction when going up to carpet. I'm sure I'll get crap because the store I work for one of the largest in will co. and other members have posed about here use apa rated wood underlament for ceramic on most new construction and retail.
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