Asphalt Shingles

Roof shingles are almost always highly visible and so are an important aspect of a building’s appearance in patterns, textures and colors. Roof shingles, like other building materials are typically of a material locally available. The type of shingle is taken into account before construction because the material is affected by the condition of the structure. All shingle roofs are installed from the bottom upward beginning with a starter course and the edge seams offset to avoid leaks. Many shingle installations benefit from being placed on top of an underlayment material such as asphalt felt to prevent leaks even from wind driven rain and snow and ice dams in cold climates.
At the ridge the shingles on one side of the roof simply extend past the ridge or there is a ridge cap consisting of specialty ridge shingles. An asphalt shingle roof has flexible asphalt shingles as the ridge cap. Some roof shingles are non-combustible or have a better fire rating than others which influence their use, some building codes do not allow the use of shingles with less than a class-A fire rating to be used on some types of buildings. No shingles are watertight so the minimum recommended roof pitch is 4:12 without additional underlayment materials

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