Vic, here is a better shot (sort of) of the layers. There's groves in the concrete then a sort of rubber mat with ball bearings (not really ball bearings but it looks like it),then plywood, then another rubber mat and then the chestnut....... the design is such that the threat of any water....salty or otherwise NEVER sees the flooring.
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and the red wire is foor the radiant heat which is only under the marble.........
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Peter
Absolutely stunning Peter!
A little of topic. Why did you go with radiant floor heating instead of using hydronic floor heating?
Thanks
Kevin