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Brief description from Green Building Solutions above :
These are the most common residential roofing mate rials used in this area. They are usually used on roofs with a 4-12 or great er pitch, but check the building code in your community. (Cleveland Heights, for example, requires that shingles also be installed on roofs between 3-12 and 4-12 pitch; the City recommends that in these cases an ice and water shield be installed beneath the shingles to prevent water from getting underneath the roofing material.) One additional layer may be applied over the firs t layer of shingles; however, on roofs that already have two layers of shingles, the roof will have to be stripped (torn-off) before the next layer is installed. If asphalt shingles are being in stalled on a roof that was originally covered with wood shingles (or, occasionally, slate or clay tiles), a base of plywood sheathing must first be installed over the entire roof su rface after the old roof is removed – generally at an extra cost.
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