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Asphalt Built-Up Roof Systems

A continuous, semi-flexible multi-ply roof membrane, consisting of plies (layers) of saturated  felts, coated felts, fabric, or mats, between which alternate layers of bitumen are applied.  Built-up roof membranes are typically surfaced with roof aggregate and bitumen, a liquid-applied coating, or a granule-surfaced cap sheet.

Modified Bitumen Roof Systems

Composite sheets consisting of a polymer modified bitumen often reinforced and sometimes surfaced with various types of mats, films, foils, and mineral granules.

TPO & PVC Roof Systems

Thermoplastic olefin (TPO) is a blend of polypropylene and ethylene-propylene polymers.  Colorants, flame-retardants, UV absorber, and other proprietary substances may be blended with TPO to achieve the desired physical properties.  The membrane may or may not be reinforced.  Membrane is white/grey in appearance.

Polyvinyl chloride (PVC) is a synthetic thermoplastic polymer prepared for vinyl chloride.  PVC can be compounded into flexible and rigid forms through the use of plasticizers, stabilizers, fillers, and other modifiers.  Flexible forms are used in the manufacture of sheeting and roof membrane materials.  Membrane is typically white in appearance.

EPDM Roof Systems

Ethylene-propylene-diene monomer (EPDM) is the ASTM-designated name for an elastomeric single-ply roofing membrane containing a terpolymer of ethylene, propylene, and diene.  EPDM is a thermosetting synthetic elastomer-that is, a macromolecular material that returns to its approximate initial dimensions and shape after substantial deformation by a weak stress and the subsequent release of that stress. EPDM roof systems are black in appearance.