FlintBoard™ ISO Plus

CertainTeed FlintBoard ISO Plus Composite Polyisocyanurate Composite Roof Insulation features a closed-cell polyiso core bonded to 1/2" perlite with a fiber-reinforced felt facer on the bottom side. The perlite top makes FlintBoard ISO Plus an ideal recovery board, and when used as the second player over FlintBoard ISO eliminates the need for a separate overlay board, yet retains the benefits of a second layer of ISO.