01 May 1999
3/ Verify there is sufficient fastening, especially for windy regions.
4/ Verify the alignment is proper at the start of the job.
5/ Verify the tab adhesive is used for cold weather application of asphalt shingles.
(2) Field Storage.
(a) Bundles of asphalt shingles should never be stacked over 1.2 m (4 ft.) high.
(b) Do not store materials directly on the ground or exposed to the weather.
(3) Packaging and Labeling.
(a) Examine all packaging and labeling for evidence of UL or code compliance
(b) Examine all lot or batch numbers (date code). Use the same lot for the entire face of
the roof to avoid manufacturing variations in appearance.
(c) Steep prepared roofings are usually furnished with application instructions on the
wrappers. Compare to published specifications.
(4) Eave Flashing (Drip Edge).
(a) Verify the eave flashing is installed per specifications.
(b) Verify the gauge and finish is per specification. (NRCA recommends 24 gauge or
heavier, prepainted galvanized steel, or equivalent coated aluminum, copper, or stainless steel
material be specified along perimeter roof edges.)
8-5. MAINTENANCE CONSIDERATIONS.
(1) Asphalt Shingles. Some loss of roofing granules is normal with time. A pattern that follows
the installation pattern (e.g., installed shingles from one bundle look better than the shingles adjacent
from the next bundle) is probably a manufacturing problem. This effect can be minimized during
installation by requiring that all shingles on a given area are from the same lot of material.
(2) Algae. Algae will cause darkening of the surface of shingles. Rinsing with a mixture of
detergent, bleach, and water may help, or in warm humid regions where algae is a problem specify
asphalt shingles with specially treated granules. Nailing zinc or copper strips at the eave is also
(3) Slate. Durability is a function of hardness of the slate. Traffic on slate roofs can lead to
breakage. Use copper, brass or stainless steel fasteners with all repairs.
(4) Traffic and Impact. Tile roofs are durable but vulnerable to roof traffic
(5) Debris. Hosing or brooming the spaces between wood shakes can be beneficial. Buildup
of leaves, pine needles, and the like inhibits drainage and accelerates rot. Cleaning gutters every
spring and autumn is beneficial to all sloped roofing systems.
b. Repair or Replace. All materials wear out. Asphalt shingle replacement is neither overly
expensive nor complex. Coatings have not been effective as treatments for asphalt shingles and may
actually accelerate failure by causing curling. Chemical treatments for wood shingles and shakes may