Compressive strength of rigid insulation

PhoenixP · Apr 5, 2007

Can anyone tell me the Compressive Strength of Rigid Insulation as I want to put a load onto a roof with rigid insulation on it, there is no issues with the roof structure itself. I am concerned about water pooling around the load if the insulation is compressed and subsequent rupture of the outer membrane.

DaveAtkins · Apr 5, 2007

I just completed a project using Geofoam, under a mat footing, and we had to limit the bearing stress to around 500 psf, in order to limit the compressive strain in the Geofoam to 0.5 percent. I think Geofoam is similar to rigid roof insulation.

DaveAtkins

whyun · Apr 5, 2007

This link gives some ranges for various insulation board material.

http://www.foamglasinsulation.com/literature/compressive.pdf

For low density boards, you may consider using cover boards to spread the impact loads.

Ponding loads, if you calculate to psi unit, will be very low.

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Compressive strength of rigid insulation

PhoenixP

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