I am about to install 2cm granite tops in the kitchen. Do you recommend using marine plywood as a backer or would hardy board be better? And also what thickness of the backer is best.

Thanks,
Chuck

Hello Chuck,

The thickness of the plywood should be 5/8″. This allows sufficient support while still allowing the 2cm (3/4″) laminated front edge to cover the plywood completely. Secondly, Marine Grade plywood is certainly the best but regular CDX plywood is ok. Just make sure you pick out some good flat smooth sheets. 5/8″ hardy board should be strong enough but I do not know of this ever being used because of high costs. It also might be too flexible so I don’t recommend it.

Best Wishes,
Tom Cordova

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