Low Slope Roofing Systems
BUR (built up roofing)- The name says it all. The roof is built up using multiple layers normally consisting first of a 75 lb base sheet either nailed or mopped to the roof deck depending on the deck type. Second two plies of GAF Ply 4 fiberglass are hot mopped over base sheet with hot asphalt. Last but not least a mineral surface cap sheet or mineral surface modified bitumen is mopped over the fiberglass using hot asphalt. Insulation is optional, but if are installing over a concrete roof deck it is recommended to prevent blistering.
There are many different Miami-Dade County approved application methods as well as different types of material that can be used when building up a roof the one listed above is th most commonly used in Miami and Broward County for more information
Built-Up Torchdown Roofs- Torch down roofing (or modified bitumen) is widely used for roofing on flat roofs. Its name is derived from the method of torching the bitumen sheets onto a fiberglass base during installation. The material used in the torch down process is also know as rubberized asphalt. Melting of the bitumen by torching creates a strong and consistent seal which makes torch down roofs long- lasting.
Although it is slightly more expensive, the roofing torch down method is generally regarded as preferable to the alternative method of roofing used for flat roof involving the use of tar and gravel. There are no noxious fumes associated with torch down roofing installation, and torch down roofs are regarded as more durable and resistant. The high quality resins that are combined with the modified bitumen in torch down roofing installation also help to provide protection from UV rays that could otherwise provide damaging.
Single Ply roofing- Unlike built-up roofing, single ply roofs are just that – one layer of roofing material as a waterproofing membrane and a weathering surface. Single ply roofing membranes are much thinner and lighter than built-up roofs. Single ply roofing is used in both residential and commercial roofing.
Single ply roofs are typically installed either in fully adhered (glued to the insulation or fiber board bellow it) or mechanically attached to the roof deck with corrosion resistant fasteners and barbed plates.
Most common single ply roofing systems today are EPDM Rubber roofing and TPO roofing systems (thermoplastic polyolefin).