Roofing Construction and Estimating Flashcards
Formula for slope of a roof?
- Rise \ Run.
Although not always necessary, solid roof sheathing is recomdnded for installation of shakes or wood shingles when the outide temperature is _________degrees F or colder
- 0 degrees.
Widest board recommended for soldi roof sheathing?
- 1” x 6”
Spacing of wood shingles when installed on non-continusus sheathing?
- 1” x 4” nominal dimension and spaced on center equal to weahter exposure.
At an eave end, drip edge is installed?
- Under the felt.
Agency that dtermines the fire rating for asphalt roofing?
- UL (underwriters labrartory).
Approximate pounds of nails required per square of asphalt shingles?
- 2.5 pounds.
Recommended procudure for installing roll roofing?
- When temp is above 45 degrees otherwise cut shorter lenghts and roll out under the sun.
Overlap for metal cap overlap over a field tile?
- 3”
Type of flashing used for open valleys on slate roof?
- 15” copper or .0179 zinc coated.
The weight of a coated vapor retarder for a built-up roof is usually about 45 to _______ pounds per square.
- 80 pounds.
Pounds of asphalt bitumen required per square between felts with an application tolerance of plus or minus 15 percent is: _________?
301: 25 pounds.
The most common type fo asphalt?
- Type III - Steep.
Max temeprature to which you can heat type III asphalt?
- 475 degrees.
Flash point for asphalt roofs?
- 437 degrees to 500 degrees.