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Old 05-04-2012, 07:12 PM   #1
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Granite countertop underlayment


My granite installer wants two 3/4 inch thick pieces of wood glued together for under the granite. Is simple waferboard good or do I need a smoother surface such as particleboard? Thank you.

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Old 05-04-2012, 07:27 PM   #2
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Granite countertop underlayment


If you are using a Granite installer, they have done this hundreds if not thousands of times. They know what wood product to use, they will either tell you what to install, or they will do it before they bring the counter in off of the truck.

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Old 05-04-2012, 07:37 PM   #3
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Granite countertop underlayment


Is this top going on kitchen cabinets? I've never heard of needing underlayment under it.
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Old 05-04-2012, 07:47 PM   #4
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Granite countertop underlayment


If it is a thinner slab, as some people are opting to go for, since it is cheaper than paying for the thicker slabs, they have to place at least 5/8" Exterior grade Plywood underneath it mrgins. The front of the slab has a edge, so that it appears that it is thicker, but in reality it is at most maybe 1 1/2" for the slab, but as thin as at least 1".
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Old 05-04-2012, 07:52 PM   #5
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Granite countertop underlayment


could you also use 5/4 hard wood 12 or 16 oc?
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Old 05-04-2012, 07:55 PM   #6
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Granite countertop underlayment


It is just easier to use plywood, because you can get it in 4x8 sheets, same as chipboard.
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Old 05-04-2012, 11:41 PM   #7
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Granite countertop underlayment


Be sure to seal the underside of the board you use by the dishwasher, steam from the drying cycle of the d/w could cause the board to swell and crack the granite.
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Old 09-24-2012, 12:06 PM   #8
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Granite countertop underlayment


i definitely would not use particleboard, the second water touches it, it pretty much disintegrates. Im dealing with this right now with my floors. So, steam from a dishwasher or a leak under your sink would destroy the underlayment. Use plywood. like one of the posters said, 5/8 would probably work but if he told you 3/4, you better use 3/4. I was told that for my floor, to coat the underside with Thompson's Water Seal before i put it down, but im not sure if that would work for a countertop or not. Good luck.

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