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Building Design and Construction Handbook - Merritt - Ventech!

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FIGURE 12.7 Three-tab asphalt-shingle roof.<br />

ROOF SYSTEMS 12.13<br />

An alternative surfacing is aggregate, similar to the type used for BUR placed<br />

directly over the foam. In this system, coatings are used only on vertical surfaces,<br />

such as parapets or equipment curbs.<br />

See also Art. 12.21, ‘‘Roof Systems Bibliography.’’<br />

12.5 STEEP-SLOPE ROOF COVERINGS<br />

These differ from low-slope roof coverings in that on steep-slope roofs water flows<br />

rapidly over exposed units to eaves. Many of the low-slope roof coverings described<br />

in Art. 12.4 can be successfully used on steep slopes. Many of the low-slope materials,<br />

however, become slick when wet. This should be taken into account before<br />

they are specified for steep slopes.<br />

12.5.1 Asphalt Shingles<br />

These are composed of a reinforcing mat (organic or glass fiber), a specially formulated<br />

asphalt coating, <strong>and</strong> mineral granules. (Glass-fiber reinforced shingles are<br />

sometimes referred to as fiberglass shingles. Organic-reinforced shingles are sometimes<br />

referred to as asphalt shingles, which is confusing, for this term properly

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