What is built up roof type?

Built-up roofing systems, or BUR, are a common type of flat roofing material. It’s literally built up using multiple layers of bitumen, felt, asphalt, and other materials to create the final result. They are relatively quick and easy to install and are applied layer by layer.

How is built up roofing applied?

ARMA defines a built-up roofing system as a roof where multiple layers of asphalt alternated with ply sheets (felts) are applied over the roof deck (vapor retarder) and, most often over insulation that is attached to the roof decking. Reflective Cap Sheet or Specified Field Applied Coating System: Asphalt. Ply Sheet.

What is a built up reflect roof?

Built-up roofs consist of several layers of reinforcing materials embedded in waterproofing materials. A coating of gravel, granules, or a reflective coating protects the surface from UV light. Common problems with these systems include: Alligatoring.

How thick is a built up roof?

How thick is built-up roofing? A BUR roof system comes in multiple layers, most often between two and four. The thickness depends on the materials used and the number of built-up roofing layers applied, but typically the selvage area ranges between two to four inches.

What is a 3 ply built up roof?

A 3-Ply Hybrid BUR differs from other membrane options due to its combination of a 1ply base sheet with two plies of glass felt that enhances the performance of the membrane with a quicker installation time and less weight on the roofing system itself.

What is built up bitumen roof?

Built-Up Roof system or BUR system is a common built-up Commercial Roofing system provided by Parsons Roofing Company. Bitumen is the first adhesive layer and roofing felt is installed in multiple plies over the base layer of a commercial roof. The top layer consists of stone, gravel, crushed slag, or other aggregates.

How many layers is a built up roof?

Built-up roofing systems are most commonly applied with three or four layers of roofing materials to make up the complete roofing system. These layers are typically a base sheet, a fiber sheet, and then either one or two layers of bitumen.

How many layers is a built-up roof?

How long will a built-up roof last?

15 to 30 years
Built-Up Roofing Lifespan Depending on the climate and the specific materials used, built-up roofing has an average life expectancy of 15 to 30 years, but some constructions can last up to 40 years. In general, built-up roofing tends to fare better in warmer climates than in cold regions.

What is the top layer of a built up roof?

The top layer consists of stone, gravel, crushed slag, or other aggregates. Typically, a built-up roof lasts anywhere between 15 and 30 years. BURs work well in warm climates since the BUR overlays are designed to cool the roof.

How long does a flat built-up roof last?

A properly maintained flat roof can last for decades, depending on the materials. A built-up roof or layers of modified bitumen can last for up to 20 years. Lightweight thermoplastic polyolefin or spray-on coatings of polyurethane foam, acrylic or silicon have a similar lifespan.