This roof section details a TPO single-ply roof membrane mechanically fastened with a UL Class A rating over two layers of polyiso rigid insulation totaling five inches for an R-30.3 LTTR. The base and top layers of polyiso rigid insulation are mechanically fastened to the underlying structural metal deck per the manufacturer's specifications. Joint sealant is applied per the manufacturer's instructions at membrane laps and penetrations.
SEALANT PER MFR. METAL DECK - SEE STRUCTURAL 2-LAYER RIGID INSULATION: POLYISO: 2.5"+2.5" = 5.0" = R30.3 LTTR - (R-VALUE PER ENERGY DOCUMENTS: R30 MIN.) TPO SINGLE PLY ROOF MEMBRANE, MECHANICALLY FASTENED, U.L. CLASS 'A' RATING FM APPROVED POLYISO RIGID INSULATION: BASE LAYER MECHANICALLY FASTENED, TOP LAYER MECHANICALLY FASTENED - PER MFR. &
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