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Built-Up Roof: a roof consisting of multiple plies of roof felts laminated together with bitumen. Built-up roof material can consist of bitumen-saturated felt, coated felt, polyester felt or other fabrics. A surfacing is generally applied and can be asphalt, aggregate (gravel or slag), emulsion or a granule-surfaced cap sheet.

This section was written simply to give people an idea of what a Built-Up Roof (B.U.R. for short) is and how it’s put together. The materials and information listed here are not comprehensive nor do they represent all types of built-up roof materials available.

Starting in the 1840’s, Built-Up Roofing is one of the oldest and most reliable ways of installing a new roof. Built-Up Roofs come in two basic types, asphalt and coal tar, and three basic components - (1) waterproofing component, (2) the reinforcing component, and (3) the surfacing component which is used to protect the other components from the elements.

There are many different types of materials used in Built-Up Roofing.
Some of these are:

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
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 B.U.R. 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
Asphalt - Types I, II, III, and IV
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
Mineral Aggregate - Gravel or Slag
Asphalt Roof Coatings
Aluminum-Pigmented Asphalt Roof Coatings - Non-Fibered
Emulsified Asphalt - Fibered and Non-Fibered
Mineral-Surfaced Asphalt Roll Roofing (Organic)
Acrylic Coatings
Elastomeric Coatings
Mineral-Surfaced Asphalt Roll Roofing (Glass Felt)