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Old 09-21-2010, 02:03 PM   #1
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2cm Granite Countertop Installation

I am replacing my existing laminate kitchen countertop with a 2cm granite counter. Do I need a plywood underlayment underneath the granite? The granite installer in my case insists it is not needed and even goes on to say that the plywood might lead to moisture related problems later. Somehow I feel that a plywood support is required in my case (2cm granite) and he might be just cutting corners. Can someone please explain whether the plywood is absolutely required or is it common practice to not use it? Thanks very much.


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Old 09-21-2010, 02:12 PM   #2
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Your "granite guy" is absolutely correct. A plywood top could be problematic in the future. Stone needs to breathe a little.


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Old 09-22-2010, 12:43 AM   #3
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A bead of silicone on the cabinet gable tops, then carefully place the granite into position.

Short of cutting off a body part, the worst that can happen in woodworking is manufacturing really nice looking kindling. --- Quoted from lenaitch
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Old 09-26-2010, 08:29 PM   #4
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For an existing cabinet with a plywood top why not sandwich some 1/4" hardi-backer with adhesive instead? Pulling the plywood off will not make that cabinet stronger or more rigid.
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Old 09-16-2011, 12:36 PM   #5
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I realize this is an old thread, but someone in the future may stumble accross it. When using 2cm granite, you MUST use a plywood backer. Preferably 5/8 or even 3/4''. I cannot stress this enough. The "granite guy", mentioned above, is totally cutting corners. You NEED a backer!
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