Roofing: types of construction

In covering commercial risks, we often run into contractors who provide roofing services and deal products as well. You may notice many roofs available, and different roofs require different services. 

• Torch down - applying roofing strips by means of propane torch on asphalt-like bitumen (that is attached to the single-ply roofing strips)
• Hot tar- Applying hot tar normally by mop to a roof and then laying strips on top
• Foam roofing - Spray a poly-urethane coat onto a roof (high insulation rating)
• Shingles - Applied with Bitumen or asbestos, shingles are predominately fiberglass but some are still made of wood. Shingles need oils to repel water, and over years the oil comes off and the shingles are susceptible to rotting. When rotten, nailheads are exposed and holes are created, also algae may be a problem.
• Tile- Hard and brittle, which means if a tree falls, the roof is destroyed.
• Metal roof- green certified (maybe made from recyclable material)
• 35-50 years longevity to be painted, never need to replace