Asphalt Shingles on Low Slopes of to

Additional precautions must be taken on low slopes to ensure a waterproof roof covering. Except for the first two courses, three thicknesses of shingles are used on the entire roof including hips and ridges. This is achieved by using an exposure of not more than one-third the full height of the shingle. A starter strip is first installed as described for higher-sloped roofs, but laid on a continuous band of cement not less than 8 in. (200 mm) wide. The first course of shingles is then cemented to the strip with a continuous band of cement that is 4 in. (100 mm) wider than the shingle exposure. For example, a 10 in. (250 mm) band of cement should be used when the shingle exposure is 6 in. (150 mm). The succeeding courses of shingles are laid on a band of cement 2 in. (50 mm) wider than the shingle expo sure, so that an 8 in. (200 mm) band Is used when the exposure is 6 in. (150 mm).

To avoid defacing the exposed surface of the shingles with cement, the band should be located between 1 and 2 in. (25 and 50 mm) above the butt edge of each succeeding course of shingles. Each shingle strip should be stapled or nailed in place with four nails.

If cold application cement is used, it should be applied at a rate of approximately 1 gal./ioo sq. ft. (0.5 L/m2) of cemented area. Hot application cement is applied at a rate of approximately 0.2 Ib./sq. ft. (1 kg/m2) of cemented area. The above technique is necessary only for slopes lower than 1:4 since there are special low-slope shingles of sufficient length to maintain the three thicknesses necessary at this roof pitch.

Application of asphalt shingles.

Application of asphalt shingles.

roof sheathing eave protection roofing nail tar seals exposure fascia board starting course either solid strip or reversed shingles roof sheathing eave protection roofing nail tar seals exposure fascia board starting course either solid strip or reversed shingles

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