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Can you walk on Polyiso Insulation? (flat roof)

9 years ago

I am planning to have a single-ply membrane roof (TPO or PVC) installed on a flat roof over 1-2 inches of polyiso rigid insulation. The membrane is strong and can be walked on. However, I am concerned that the insulation can get dented if someone is heavy footed, drops a tool, or bangs a heavy ladder when climbing up to do something on the second story of the house. Would the polyiso insulation get dented?. (If it gets dents, puddles would form and not drain away). The compression strength is 20 psi, but I am not sure how to interpret this figure.

I am guessing that I or someone else would be on this roof about 12-15 times a year for one reason or another.

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