BUR
Built-up roofs, or BURs, have traditionally been one of the more popular installation methods for flat commercial or industrial roofing in North America.
*According to the National Roofing Contractors Association: “Built-up roof membranes are composed of layers of bitumen, asphalt, or coal tar, or cold-applied adhesive that serves as the waterproofing component of the membranes. Plies of reinforcement fabric, such as organic felt, which was once cotton- or rag-based, but is now primarily cellulose-based, glass fiber ply sheet or polyester fabric, are installed between each layer of bitumen or cold-applied adhesive. Bituminous membranes are installed in multiple-ply configurations, with bitumen or cold-adhesive between layers or plies of reinforcing fabric to compose the ‘built-up’ membrane.”_
Donan Engineering’s team of professional engineers has the knowledge and experience to successfully study BUR for proper installation, material defect, wear and tear, storm damage, and other potential causes of roof system failure.
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