Product: Cornell Corp. Vent-Top ThermaCal 1

Designed for use on shingle and metal roofs, Cornell Corp.’s Vent-Top ThermaCal 1 system consists of 7/16″ OSB sheathing, 1″ wood spacer blocks, and polyisocyanurate insulation board offered in thicknesses between 3″ and 8″. The fully machined assembly offers R-values between 9 and 40.5 and weighs between 1.9 to 2.9 psf. The edges of the 4′-by-8′ panels feature rabbeted wood and a tongue-and-groove pattern in the foam to reduce heat loss. The 12″-o.c. wood spacers allow for 86% up-slope venting and more than 50% cross ventilation. • cornellcorporation.com