Sloped roofing is a ‘water shedding’ roof assembly compared to a flat or low sloped ‘water resistant’ roof assembly.

A ‘water shedding’ roof assembly usually consists of roofing shingles that overlay each other. The slope must be generous enough to allow gravity to push the water downward. By convention, a roof slope exceeding 3” in 12” is required to be called steep roofing.

The design of steep roofing is usually straightforward. The basic components are shingles, the underlayment for them, and the roof deck.

The most common shingles are:

– asphalt shingles
– wood (cedar) shingles/shakes
– metal shingles
– clay and concrete shingles
– slate shingles

Selection of these differing shingle materials is usually dependant on the existing “in place” assembly, aesthetic requirements, durability, life cycle costing, and deck design.

The underlayment is a water resistant layer that is now required throughout the roof area as a second line of waterproof protection under shingle installations.

The roof deck is the most important part of a steep roof assembly. Design depends on the shingle employed.

At Trimstyle, all roofing shingles are under our purview.