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TPO (Thermoplastic Membrane Roofing)

Thermoplastic Membrane Roofing (TPO) is a cool-roof system. TPO membranes are produced by calendering with lamination, extrusion with lamination or extrusion-coating techniques. TPO sheets consist of a blend of polypropylene and ethylene propylene polymers and are usually reinforced with polyester. The resulting TPO sheets incorporate colorant, flame-retardants, UV absorbers and other proprietary substances to obtain the targeted physical properties. LEED points available.

PVC (Polyvinyl Chloride Roofing)

Polyvinyl Chloride Roofing (PVC) is a cool-roof system. PVC sheets are manufactured by calendering, spread coating or extruding, and are usually reinforced with polyester or glass-fiber mats or scrim. PVC sheets consist of plasticizers, stabilizers, as well as other additives for flexibility and to impart other targeted physical properties. LEED points available.

EPDM (Ethylene Propylene Diene Monomer)

Ethylene Propylene Diene Monomer (EPDM) — A type of synthetic rubber that is an elastomer characterized by a wide range of applications. EPDM is principally composed of two compounds, ethylene and propylene that are derived from oil and natural gas. EPDM possesses outstanding resistance to a variety of weather conditions, including sunlight, ozone and heat, and good resistance to alkalis and acids. Typically used as a waterproofing system for roofs, EPDM does not pollute runoff rainwater.

BUR (Built-Up Roof Membranes)

Built-up roof membranes (BUR) contain asphalt, coal tar or cold-applied adhesive in the typical bitumen. The asphalt (petroleum product refined from crude oil) or coal tar (derived from the distillation of coal) is heated in a kettle or tanker and then applied by mop or mechanical spreader. The cold-applied adhesives are solvent-based asphalts that don’t have to be heated.

Concrete Tile

Concrete Tiles consist of Portland cement, sand and water. These materials are then mixed in the desired proportions and extruded under high pressure on molds. Cementitious material, colored with synthetic oxide additives may be used to finish the exposed surface of the tiles. Required strength is achieved through curing. Concrete tiles typically have lugs on their undersides for anchoring to batten strips. Tiles employ interlocking ribs on the longitudinal edges that impede movement and prevent water infiltration.

Slate Roofing

Slate Roofing is a dense, hard-wearing, naturally-occurring material that is nonabsorbent. Chemical and mineral composition determines the color of slate and because these factors differ from region to region, roofing slate is available in a wide variety of colors. Exposure to weather causes slate to gradually change color.

Standing Seam

Standing Seam Roofing consists of preformed, or field-formed, pans. Pans typically measure about 18 to 24 inches wide when finished. Standing Seam pans run parallel to the slope of the roof and are connected to adjacent pans with double-locked standing seams. LEED points available.


Shingle-Composite, or Asphalt Shingles are the most commonly used roofing material on homes and a variety of commercial structures in the United States. Asphalt Shingles are composed of a base material or organic felt or glass-fiber mat that provides support for the weather-resistant components and imparts strength to the shingle. Asphalt, fillers and surfacing materials—generally in the form of mineral granules—provide protection from impact, UV degradation and improve fire resistance. The duration or life expectancy of composition shingles ranges from 20 to 30 years, depending on the quality rating. Most problems occur with composition shingles due to improper installation such as inadequate ventilation and/or flashing.


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