Built-up roofs (BURs) are a type of roofing system made up of multiple layers of material, usually asphalt or coal tar, that creates a waterproof barrier over the roof deck. They have three basic components: a waterproofing layer, a reinforcing layer, and a surfacing layer. BURs can be installed over various types of roof decks if the proper substrate is used and can be customized to meet the specific needs of a roof. It is important to work with a professional roofing contractor for proper installation.
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BUR or Built-up roof consists of multiple plies of roof felts laminated together with bitumen. A surfacing is generally applied and can be asphalt, aggregate (gravel or slag), emulsion, or a granule-surfaced cap sheet.
Base sheets are usually the first piece of Built-Up Roofing material installed and are usually mechanically-fastened (nailed) to the deck or substrate. Felt layers can be installed with hot asphalt, coal tar, or cold-applied liquid adhesive (solvent-based asphalt or "cutback" asphalt.) The surfacing is the same amount of bitumen, or lap cement used to install the cap sheet as is used to install the plies.
The service life of a roof is dependent on many factors: geographical location & weather conditions, foot traffic, materials used, conditions under which the roof was installed, slope of roof, type of surfacing material, etc. Under ideal conditions, a 3-ply built-up roof should last at least fifteen years, a 4-ply should last at least 20 years, and a 5-ply should last at least 25 years.
When it comes to picking the type of material you should use on your built-up roofing system you have several options. Knowing what type of material to pick depends on several factors:
