granite countertop tile question


Hi.....I am contemplating installing a granite tile countertop. All the DIY pages use concrete backer board, or denshield, adhered to the plywood underlay used to form the base for the replacement countertop. What would happen if one just glued the granite tiles directly to the plywood, and sealed them very well to prevent moisture from getting underneath? I can see the need for backer board in say a shower stall floor, but a countertop?
Thanks in advance for any replies.
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If the ply is thick enough, go ahead. However think of it this way. The backer board is cheap insurance. Lou
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Suggest you really think this over as the tiles are liable to become uneven with time , if you do sugest you use the backer board and a good scratch coat . Test your tile for seal by putting canola oil on them for 20 secs see if there is a mark left if so get another tile . Also seal your grout.
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My original countertop was on particleboard, thin wax construction paper above that and than a mortar bed for the tile. This original install lasted 20 years and no water damage to any of the particleboard below, even around the sink area. I didn't trust my skills to do the same thing so I use concrete backer board with plywood as cheap insurance.
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Concrete board is more stable and will better withstand expanding and contracting due to variations of temp and humidity over time, and it won't warp. -----
- gpsman
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