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I've been cutting down a steel door to fit a short old basement doorway and am currently cutting out the foam core at the bottom so that the interior bottom rail of the door can be replaced. The foam core looks like standard styrofoam, but I noticed that it seems to be fiber-reinforced. I've lived in an old house for long enough to assume that all building materials are deadly until proven otherwise, so I'd like to know what these fibers are. Just fiberglass? Something even more benign?

It's a newly bought Jeld-Wen steel clad exterior door.

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  • It looks like fiber glas but the only way to know for sure is to have it tested. – ArchonOSX Aug 15 '17 at 18:55
  • It is fiberglas, asbestos fibers aren't that long . – blacksmith37 Aug 15 '17 at 20:35
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    If it's newly-bought, then it's safe to assume it isn't asbestos. – Mike Baranczak Aug 15 '17 at 21:01

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