Asphalt, wood shakes, slate and other overlapped roofings are fine until they meet an obstruction. Up against a dormer, a vent pipe, a chimney, they need flashing — a patchwork of metal sheets, and ...

DENVER--(BUSINESS WIRE)--Johns Manville, a Berkshire Hathaway company with over three decades of experience producing modified bitumen, announced today two new products for bituminous roofing systems ...