This article is for Built–up roofing, which is called BUR also. For Low-slope roofs it is the most common roofing material method. It is composed of alternating layers of reinforcing fabric and bitumen (asphalt) and is finished with a top layer of aggregate, such as stone or gravel.
Built-Up Roofing Systems (BUR) | Building Architecture
Built-Up Roofing Standards and Code References
Reference is made in this article to the following documents.
American Society of Testing Materials (ASTM)
C 208 Specification for Cellulosic Fiber Insulating Board
C 726 Specification for Mineral Fiber Roof Insulation Board
D 41 Specification for Asphalt Primer used in Roofing, Dampproofing and Waterproofing
D 312 Specification for Asphalt Used in Roofing
D 1079 Terminology Relating to Roofing, Waterproofing, and Bituminous Materials
D 1863 Specification for Mineral Aggregate Used on Built-Up Roofs
D 2178 Specification for Asphalt Glass Felt Used in Roofing and Waterproofing
D 3617 Practice for Sampling and Analysis of New Build-Up Roof Membranes
D 3909 Specification for Asphalt Roll Roofing (Glass Felt) Surfaced with Mineral Granules
D 4586 Specification for Asphalt Roof Cement, Asbestos-Free
D 4601 Specification for Asphalt-Coated Glass Fiber Base Sheet Used in Roofing
National Roofing Contractors Association (NRCA)
Quality Control Guidelines for the Application of Built-up Roofing
Roofing and Waterproofing Manual
Built-Up Roofing Definitions
For the purpose of understanding this article, the following definitions apply.
For definition of terms related to roofing work, see ASTM D 1079 and glossary of NRCA Roofing and Waterproofing Manual.
Hot Roofing Asphalt. Roofing asphalt heated to its equiviscous temperature, the temperature at which its viscosity is 125 centipoise for mopping application and 75 centipoise for mechanical application, within a range of plus or minus 14 °C (25 °F), measured at the mop cart or mechanical spreader immediately before application.
Performance Requirements
Installed roofing membrane and base flashings shall remain watertight, shall not permit the passage of water, and shall resist specified uplift pressures, thermally induced movement, and exposure to weather, without failure.
Roofing materials shall be compatible with one another under conditions of service and application required, as demonstrated by roofing manufacturer based on testing and field experience.
Built-Up Roofing Documents
The following shall be submitted to Company:
a. Product data for each type of product indicated.
b. Shop drawings, including plans, elevations, sections, details, and attachments to other work, for the following:
(i) Base flashings, cants, and membrane terminations.
(ii) Tapered insulation, including slopes.
(iv) Crickets, saddles, and tapered edge strips, including slopes.
(v) Insulation fastening patterns.
c. Samples for verification for the following products:
(i) 300 x 300 mm square of base sheet, and ply sheet.
(ii) 300 x 300 mm square of mineral-granule-surfaced cap sheet and flashing sheet.
(iii) 300 x 300 mm square of roof insulation.
(iv) 1.5 kg of aggregate surfacing material.
(v) Full-size walkway roof paver, or if required, roof-paver ballast.
(vi) Six insulation fasteners of each type, length, and finish.
d. Installer certificates, signed by roofing system manufacturer certifying that installer is approved, authorized, or licensed by manufacturer to install roofing system.
e. Manufacturer certificates, signed by roofing manufacturer certifying that roofing system complies with requirements specified in 4.1.
f. Maintenance data for roofing system, for inclusion in maintenance manuals.
g. Sample Warranties. Special warranties specified in this specification.
h. Copy of roofing system manufacturer’s inspection report of completed roofing installation.
Built-Up Roofing Quality Assurance Guidelines
Built-Up Roofing Types, Materials, and Installation
Built-up Roofing Quality Control Guidelines | How to Inspect
Built-Up Roofing Installation Procedure