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SIPs calculation

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Does anybody know a simple method to calculate the deflection in a flat SIPs roof panel, which is composed of composite materials. The load (in Arizona) is 20 LL + 15 DL and the clear span is 17’. For allowable deflection values, the outer layers are 7/16” OSB and the inner layer is 5-1/2” thick 2.0 lb density polyurethane foam with a tensile strength of 96 psi and a compressive strength of psi. The OSB has a tensile strength of 7450 psi and a stiffness strength of 55,600 lb-in^2/ft. All strengths are along the grain line, the direction of interest.


Thank You, Mark Benjamin

Crown Jade Design and Engineering, Inc.

 (970) 472 2394


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