Design Notes

Acoustics:

3-ply CLT = IIC 22 & STC 38 5-ply CLT = IIC 25 & STC 41 (Rigid board and roofing membrane not included)

Fire:

Non-rated 3-ply CLT 1 1/2-hr rating possible: 5-ply CLT Design No. L901 Would require adding a topping under the rigid insulation

Typical Roof Assembly with Rigid Insulation & TPO*

Roofing membrane 1 1/2" cover board Roofing insulation CLT panels

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