"Builders first began constructing site-built curbs years ago to help compensate for flat or low-pitched roofs and to accommodate tile roofs and other popular materials," said company president Timothy Miller.
According to Miller, the Model FCM sizes were configured to fix approximately 90% of all curb mount installations in new construction and remodeling. Miller said research indicated that quick installation is important with curb mounted installations. As a result, the FCM has a pre-applied, 4 mm-thick gasket constructed for compression around any defects or misalignments in the wood curb, even those up to a half-inch out of square. The gasket also acts as a seal to protect against moisture, debris, dust, dirt, and air filtration.