Design Notes

Acoustics:

3PLY 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.

Conduit/Pipe Penetration at CLT Roof Deck

Penetration in CLT is provided either pre-cored or cored in place depending on size of penetration required.

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