Steep-Slope Roof
There are several types of roofing systems typically installed on steep-roofing projects. Existing low-slope roofs can be replaced or retrofitted.
Shingle/Slate/Tile
Shingle: A small unit of prepared roofing designed for installation with similar units in overlapping rows or courses on inclines normally exceeding 3:12 slope (14°)
Slate: A hard, brittle metamorphic rock consisting mainly of clay minerals, used extensively as dimensional stone for steep roofing and in granular form as surfacing on some other roofing materials.
Terra cotta: Low-fired clay, either glazed or unglazed.
Metal
Any of various opaque, fusible, ductile and typically lustrous substances that are good conductors of electricity and heat.
There are several types of metal roof systems
Architectural Standing seam: in metal roofing, a type of seam between adjacent sheets of material made by turning up the edges of two adjacent metal panels and then folding or interlocking them in a variety of ways.
Copper: a natural weathering metal used in metal roofing or flashing; typically used in 16 ounce per square foot (0.56 mm) and 20 ounce per square foot (0.69 mm) thicknesses.
Aluminum: a nonrusting, malleable metal sometimes used for metal roofing and flashing.
Galvanized steel: steel coated with zinc for corrosion resistance.
Steel: a malleable alloy of iron and carbon produced by melting and refining pig iron and/or scrap steel; graded according to the carbon content (in a range from 0.02 to 1.7%); other elements, such as manganese and silicon, may be included to provide special properties.
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