Heating Mats – NADWM

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Can I install the cable directly on top of the plywood ?

Since wood functions as a natural insulator, you can install your Warmup floor heating system directly on top of such a sub-floor.  Of course, using Warmup floor insulation will still improve performance.

Exception: if your installation involves having a non-insulated crawl space under the plywood, in that case we would recommend the use of insulation boards prior the installation.