Lopez Roofing Co. will help you decide what type of low pitch, flat roof you want to install.
There are five basic types. All require periodic inspection and can need maintenance to fix any punctures, tears, cracks or cuts. They are all in rolls of 1 yard (91.44 cm), or in 1 meter width (39.4 inches) except for Single-ply Membrane which come folded:
- Built-up Roofing: This method, known simply as BUR, is done by overlapping rolls of treated felt using hot (molten) tar or asphalt. It becomes brittle and cracks up over the years.
- Single-Ply Membrane Roofs: This type is excellent but requires propane torch heat to install the seams. The membrane may be injured, cut, etc. and with only the one layer that can be problematic.
- Sprayed Polyurethane Foam: This kind of roofing material is sprayed, or squeegeed flowed onto the surface and may be protected by a special second coating.
- Modified Bitumen (Asphalt) Roll Roofing: This is a method in which a single layer of asphalt-treated, granule coated felt is cold cement sealed or hot sealed to the primed decking or to a base sheet.
- “SA” Self-adhesive (SBS, APP or modified bitumen) rolls: These often include (1) both an SA base sheet and the SA cap sheet, both come in rolls — or (2)only a single cap layer is applied to a primed decking. (The material has a split backing where after a length of it is rolled-out and aligned, then half the backing is pealed off and that half smoothed down; next the other half of backing is peeled and smoothed down as well.)