Our end unit 1940"s row house has an old leaking bitumen roof . The water entry point can not be found so a replacement seems the way to go. A roofer suggested a replacement using Firestone 180, 1/2 inch fiberboard insulation covered with fiberglass base sheet, bitumen for flashing and fibered aluminum coating on wall coping . It's all Greek to be but fiberboard insulation and flashing material ? Should I be concerned?
We use kingspan insulation, marine grade plyboard , 3/4 inch, and yes you can use bitumen as flashing. I hope i am not being condescending, but the flashing is the bit that goes from the roof and a little way up the wall and is then "pointed" into the bricks, thus forming a water-proof barrier.
