built up roofing dallas tx

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Saturday, 29

Tar and Gravel Bur Systems:

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.
  • B.U.R.’s come in two basic types, asphalt and coal tar, and three basic components – (1) the waterproofing component, (2) the reinforcing component, and (3) the surfacing component which is used to protect the other components from the elements.

tar and gravel bur systems  dallas tx

The application of gravel or slag surfacings are probably the most popular. The next most popular surfacings are probably the granule-surfaced cap sheets. Then come the emulsions which can be spray, brush, or roller applied.

  • Base sheets are usually installed and are usually mechanically-fastened (nailed) to the deck or substrate
  • Then come the felts, these can be installed with either hot asphalt or coal tar, or cold-applied liquid adhesive, a.k.a. solvent-based asphalt or "cutback" asphalt.
  • Last is the surfacing cap sheet, with gravel or slag, 400 – 500 pounds per square of gravel or 300 – 400 pounds per square of slag is embedded
  • An aluminum reflective coating should be applied after the emulsion cures to help reflect damaging UV rays.
  • Built-up roofs can be installed over just about any type of roof deck as long as the proper substrate is use
  • The service life of a roof, under ideal conditions, should last at least 15 - 25 years, depending on 3-4-5 ply installed.