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ambersinha 09-21-2010 02:03 PM

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.

Bud Cline 09-21-2010 02:12 PM

Your "granite guy" is absolutely correct. A plywood top could be problematic in the future. Stone needs to breathe a little.:)

jlhaslip 09-22-2010 12:43 AM

A bead of silicone on the cabinet gable tops, then carefully place the granite into position.


tns1 09-26-2010 08:29 PM

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.

dmbuilder 09-16-2011 12:36 PM

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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