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Built up roofing is laid down to conform to the roof deck and to protect all angles formed by the roof deck with protecting surfaces, and forms a single unit flexible waterproofed membrane fastened to the deck by cementing and nailing.  The principle on the flat roofs is to turn the membrane up to form a skirting or base flashing on the vertical surfaces, making a watertight seal. The only outlets from this roof are the roof drains to dispose of water, or eave troughs along the outer edge.

Modified Bitumen is a rolled membrane composed of reinforcing fabrics coated with polymer-modified bitumen. Torch-applied membranes are tough, resilient membranes manufactured to stringent specifications. Their core is a strong, resilient, non-woven polyester mat that is coated with weather resistant, polymer-modified asphalt. "FR" designated membranes are coated with an inherently fire retardant polymer-modified asphalt. Ruberoid torch-applied membranes are designed for new roofing and re-roofing applications as well as construction of flashings. They are also an ideal product for the repair of built-up roofing systems.

Modified polyester-reinforced mop-applied membranes are tough, resilient modified bitumen membranes manufactured to stringent specifications. Their core is a strong, resilient, non-woven polyester mat that is coated with flexible; Styrene Butadiene-Styrene (SBS) modified asphalt and surfaced with mineral granules. "FR" designated membranes are coated with an inherently fire retardant polymer-modified asphalt. Mop applied membranes are designed for new roofing and reroofing applications as well as construction of flashings. They are also an ideal product for repairs of built-up roofing systems.

Modified - Mop Applied - Fiberglass Reinforced

Fiberglass-reinforced membranes are lightweight, flexible, inherently fire-resistant roofing system with twice the protection from the elements. It is designed for new roofing and reroofing applications where a UL Class a rating is required in a cost-effective multi-ply system.

This system also offers dual protection because of its two-ply system. The first ply has as its core a strong fiberglass mat. This base ply can be used over most decks and roof insulations on slopes up to 3 inches per foot. The top ply also uses a strong fiberglass mat. Both plies are coated with SBS modified asphalt, formulated to give the overall system a UL Class A rating without the need for additional gravel or coatings. This membrane is surfaced with mineral granules offering weathering protection for the SBS-modified asphalt used in the system. In addition to its use in a combined system, it can be used as a component in other modified bitumen systems also.

Rubber

Enterprise offers a wide range of rubber systems, with five, ten, fifteen year warranties available.

This time honored system is preferred for many installations where speed and economy are prime considerations.  Since both insulation and membrane can be loose laid, with Membrane fastened only at the perimeters, and seams limited by applying larger sheets of EPDM membrane, this greatly reduces the installation time required, and that translates into dollar savings.

The fully adhered system is frequently used when a smooth look is desired.  It is ideal for both new and re-roof installations.  Once the membrane is position over the substrate , both the back of the membrane and the bonding surface of the substrate are coated with a bonding adhesive.  The membrane is carefully rolled back and brushed down using a push broom.  Seams are adhered using a seam tape.  This system installs quickly, and has a continuous smooth surface, with no mechanical penetration of the membrane.

Polyvinyl chloride (PVC) is one of the most versatile polymeric compounds for industrial and commercial applications. It is basically a semi-rigid material, but plasticizers, stabilizers and other ingredients impart flexibility, stability and other required properties. PVC was first introduced in North America in the early Seventies. Early problems of shrinkage and embrittlement due to the loss of plasticiziers have now been largely rectified by incorporating more stable plasticizers and glass or polyester fiber reinforcement. Lap joint failures have also been reduced as a result of the use of hot air welding (from an electrically powered hot-air gun) instead of a solvent for adhesion, although solvents are still in use.

Like other single-ply membranes, PVC sheets can be fully adhered, partially attached, or loosely laid and ballasted. The membranes can be exposed to solar radiation without undue deterioration since they contain pigments and UV absorbers. PVC coated sheet metal can be used for flashings and other architectural details due to the ease with which PVC can be heat sealed. These features allow PVC membranes to be used in a wide variety of roof configurations. They are also available with a foam on non-woven polyester fabric backing, which acts as a cushion to accommodate the roughness of the substrate.

The PVC membrane should not come into contact with bitumen or coal-tar pitch if it is applied over an old BUR. The plasticizer in the PVC migrates into the bituminous layer, causing the PVC to become brittle and fairly prematurely. Several types of separation sheets or underlays can be used to avoid this problem.