Built-Up Roof

Business / Construction / Built-Up Roof: A roofing composed of three to five layers of asphalt felt laminated with coal tar, pitch, or asphalt. The top is finished with crushed slag or gravel. Generally used on flat or low-pitched roofs.
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Roof Jack

Business / Construction / Roof Jack: Sleeves that fit around the black plumbing waste vent pipes at, and are nailed to, the roof sheeting. MORE

Roof Joist

Business / Construction / Roof Joist: The rafters of a flat roof. Lumber used to support the roof sheeting and roof loads. Generally, 2 X 10's and 2 X 12's are used. MORE

Roof Decking

Business / Real Estate / Roof Decking: The undersupport material which is typically wood for attaching shingles and other materials to the roof. MORE

Rolled Roofing

Business / Real Estate / Rolled Roofing: An asphalt roofing material that is manufactured in rolls with granules on one side. Asphalt roofing is a relatively inexpensive and short-lived product, and should not be used as a roofing material o MORE

Proof Theory

Technology / Computers / Proof Theory: This deals with the actual 'logic' of the programming. Using mathematical analysis techniques, the programming language is proof checked. MORE

Roll Roofing

Business / Construction / Roll Roofing: Asphalt roofing products manufactured in roll form. 36-inch wide rolls with and 108 square feet of material. Weights are generally 45 to 90 pounds per roll. MORE