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Roofing Felt - heat tolerance

Posted by Dave on January 11th, 2001 11:41 AM

I'm installing electric, radiant floor heating. The manufacturer told me that the heating element gets up to about 200 degrees. He could not answer my real question which was:

Will putting a layer of roofing felt down on the subfloor present a fire hazard? That is, wood subfloor, felt, heating element/mortar, tile.

Since there is no oxygen, I wouldn't expect any flames (but you never know.) Also, roofs get pretty hot in the summertime - but do they reach 200* under the shingles?

What do you think?

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