Composition Shingles Flashcards
What are organic chingles
Saturated with heavy asphalt paper and surfacing with a protective layer of minerals.
What are fiberglass shingles
Coated a mat of galss fibers with asphalt and with a protective layer of mineral granules.
What is the roof slope of shingles?
4:12 or greater
There are … strip shingles in a bundle and … bundles per square.
- 27 strips
- 3 bundles
How much of the strips are exposed to the weather?
5”
What are top laps?
The distance a shingle overlaps the shingle directly below (7”)
What is head lap?
Lap of 2 to 3 inches over the upper edge of the shingle.
How many nails an what is the spacing for a three-tab strip shingle?
- 4 nails per strip
- Placed 3/4 to 1 inch above the cutouts
What is one of the purposes of roofing felt underlayment?
Keeps the roof sheating dry until shingles can be applied
What is shingle underlayment?
Starts at the eave with a top lap of at least 2” at all horizontal joists, and side laps 4” at all end joints.
Lap over all hips and ridges … on each side
6”
What is a drip edge?
Causes water to drip free of the underlying cornice or fascia.
Where do you install drip edges?
Over the underlayment at the rakes and under the underlayment at the eaves
* Nailed every 8” to 10”
How is th first course of shingles installed?
Installed inverted.
How far and what way are closed valleys installed?
- Shingles must extend at least 12” beyond the center if the valley.
- Laid alternately, weaving the valley shingles over each other
