New bitumen felt roofs can unfortunately still carry a bad reputation from the older and now unused pour and roll systems of yesteryear. Large strides have been made, and continue to be made in flexibility and durability of a modern hot flame applied torch on roofing felts. Typically applied in a 3 layer system consisting of a vapour control layer, a layer 2mm reinforced felt and a 4mm layer of felt called a cap sheet which can be a plain black bitumen finish for a solar reflective paint finish, or a mineral fleck finish in a variety of colours, typically green, brown and a purple / blue.
Damage resistance – Foot traffic in hot weather may scuff the surface of a mineral finish; this can lead to U.V. damage by sunlight. Window cleaners also put step ladders and ladders on them in hot weather which could damage the surface.
Repair – Easily repaired but patches on top can look messy, the plain cap sheet with solar reflective paint is the most repairable and popular in unseen and industrial settings for this reason.
Appearance – Beauty is in the eye of the beholder, but a mineral finish is pretty to look at, like brown and purple.
Installation issues or concerns – Make sure that any contractor has full insurance to work with hot flame, mine carries £1,000,000 liability – never attempt a DIY installation.