If my subfloor is cement or concrete, do I still need backerboard underneath the marbles? Please advice.
Thx.
If my subfloor is cement or concrete, do I still need backerboard underneath the marbles? Please advice.
Thx.
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Replies
No. The backerboard is used to either raise the level of a floor, and/or provide a good bonding surface for the thinset. Clean concrete will be an excellent substrate for your floor tiles.
Be careful with the choice of thinset. If you are using green marble you have to use white thinset. And some people have reported that white marble will show some discoloration with regular grey thinset. Just go ahead and spend the extra $2-$3 per bag and use white thinset.
"Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
White, pink, yellow, or green need white thinset. Or any that is translucent.Another reason for backer board is to provide a surface with same degree of thermal movement and to add strengthor decrease deflection to a wood framed floor.
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Just plan on using white thinset with any marble. Cheap insurance."Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
Shame on you Paul...CBB should not be relied on to provide strength to a subfloor.I don't Know what I am doing
But
I am VERY good at it!!
Not as a primary purpose, but it does do so.
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!
Thanks. I bought cherry marble at home depot for less than $5/box. It's really pretty good deal.
No one else memtioned it, so I will.
A tile or stone install over concrete requires an isolation membrane.
While I may not be dutifully capable of thoroughly explaining all (or even some) of the reasons why this is needed; trust me, you need it.
Google isolation membrane and pull up a beer.
[email protected]
Only if you are spanning a joint in the slab, or if there are visible cracks that suggest differential movement."Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
Well I don't recall any information from the OP about how old/new the slab was, or even how thick or what condition it was in.
Concrete calls for a slip sheet. Check the TCA hand book and correct me if I am wrong.[email protected]
I was assuming the slab was poured by Jim-Bob and the Boys, and it's in perfect conditioon, perfectly flat, well reinforced, etc.
But you are right, a crack isolationm membrane is the right way to go."Put your creed in your deed." Emerson
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
And if I was "spanning a joint" I probably wouldn't.
Seems like a perfect location for trouble; or perhaps and expansion joint in the tile.[email protected]