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What is the overall thickness of a WarmWire installation over an existing plywood floor?
by Lindsey on April 2, 2013
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Here are a few rules of thumb:

1. 1/8 inch to 1/4 inch of thinset over the plywood
2. Then, 1/4 inch or 1/2 inch backerboard.
3. Then, the WarmWire wire.
4. Then 1/4 inch to 3/8 inch thinset over the WarmWire.
5. Finally, 1/4 to 5/16 inch tile.

So, the overall thickness of your completed WarmWire tile floor will be about 7/8" - 1" thick. This is only about 1/8 to 1/4 inch thicker than a cold floor without heat.