BUR Roofing Contractors

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.

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Built-Up Roofing

Built-up roofs can be installed over just about any type of roof deck if the proper substrate is used. BURs come in two basic types, asphalt and coal tar with three basic components; waterproofing, reinforcing, and surfacing.

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Modified Bitumen Roofing Installation

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.

Built-Up Roof Materials

Bitumens for BUR

  • Asphalt – Types I, II, III, and IV (and SEBS)
  • Coal Tar – Types I, II, and III
  • Lap Cement - A.K.A. Cold-Applied Liquid Adhesive, A.K.A. Solvent-Based (Cutback)
  • Asphalt - Type I (Grades 1 and 2), and Types II and III

Asphalt-Coated Base Sheets

  • Asphalt-Coated Organic Base Sheet – Perforated and Non-Perforated
  • Asphalt-Coated Glass Fiber Base Sheet
  • Asphalt-Coated Glass Fiber Venting Base Sheet, Types I and II
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Felts And Fabrics for BUR

  • Asphalt-Saturated Organic Felt – Types I (A.K.A. No. 15) and II (A.K.A. No. 30)
  • Coal Tar-Saturated Organic Felt
  • Smooth-Surfaced Asphalt Roll Roofing – Types I, II, III, and IV
  • Asphalt- or Coal Tar-Saturated Cotton Fabrics
  • Asphalt- or Coal Tar-Saturated Woven BUR lap Fabrics
  • Asphalt-Impregnated Glass Felt – Types III, IV, and VI
  • Coal Tar-Impregnated Glass Felt – Type I
  • Thermoplastic Fabrics for Built-Up Roofing – Types I, II, III, and IV

Surfacings for BUR

  • Mineral Aggregate – Gravel or Slag
  • Asphalt Roof Coatings – Asbestos and Non-Asbestos
  • Aluminum-Pigmented Asphalt Roof Coatings – Non-Fibered, Asbestos Fibered, and Fibered without Asbestos
  • Urethanes and other elastomeric coatings (too many to list)
  • Emulsified Asphalt – Fibered and Non-Fibered
  • Mineral-Surfaced Asphalt Roll Roofing (Organic)
  • Mineral-Surfaced Asphalt Roll Roofing (Glass Felt)
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