Tile Underlayment


Old 02-11-04, 10:55 AM
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Tile Underlayment

I am planning to install 12 inch tile on a newly constructed floor. The floor consists of 2 layers of 3/4 inch plywood. Do I have to use 1/2 inch cement board or can I use a thinner cement board?
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Old 02-11-04, 12:46 PM
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Go with the 1/2" backerboard and make sure the two layers of 3/4" plywood are well fastened together.
Old 02-11-04, 02:03 PM
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WHY NOT 1/4"?(backerboard) i would.
Old 02-11-04, 04:46 PM
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1/4 " is fine since you have 2 layers of 3/4" sub you are supposed to have atleast 1 1/4" of underlayment for ceramic......so 1/4" will do fine for you......just remeber to spread thinset underneath before you nail it down
Old 02-15-04, 07:42 AM
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I'd agree with the 1/4" cbu being acceptable, do put down the thinset and use screws, not nails on the cbu.
Old 02-15-04, 12:19 PM
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you can use nails with concrete subfloors they need to be 1 1/4" roofing nails if you read the label on the board it tells you that plus nails are cheaper than screws and if you have a roofing nailer its much quicker
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