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COMMERCIAL ROOFING SYSTEMS
Spray Foam Roofs
Spray Foam Roofs are custom-built utilizing closed-cell sprayed-in-place polyurethane foam. The liquid applied application quickly adheres to and entirely covers the roof deck, forming a solid, seamless, monolithic roof membrane to seal the building envelope, as both a thermal and moisture barrier, without joints, fasteners, seams or cracks. Expertly installed, spray foam fills every crevice, corner, gap, and any angle changes to form a waterproof seal around rooftop solar equipment, parapet walls, vents, pipes, HVAC systems, skylights, and other roof penetrations. These lightweight roofs can be installed directly over most existing roof membranes, offering a cost-effective and environmentally friendly alternative to a complete roof removal and replacement. Spray Foam Roofs combine the energy-efficiency of high-performance insulating spray foam with the reflective properties of a Cool Roof Coating, resulting in the most energy-efficient roof available.
Strong Contractors believes Spray Foam Roofs, if installed properly, are the best roofing system on the market.
Below are other commercial roofing systems available...
Built-Up Roofs (BUR)
Commonly referred to as "tar and gravel" roofs, BUR systems generally are composed of alternating layers of bitumen and reinforcing fabrics mopped solid with hot asphalt, which create a finished membrane. They are then covered with gravel, a mineral sheet cap, or other weather resistant coatings. Generally, BUR systems are three or four ply. Built-up roofs have been around for more than 100 years and we believe there exists technology that is more cost effective, environmentally friendly, and efficient, for that reason Strong Contractors does not install BUR systems.
Modified Bitumen Roofs
Modified Bitumen systems combine the layers of a BUR system during the manufacturing process rather than during the application process, creating a single-ply application. Polymer modifiers can be added during the manufacturing process to give the roof additional elasticity, temperature flexibility, and weatherability.
Single Ply Roofs: EPDM, TPO, PVC
Single ply roof systems consist of flexible sheets, made from state-of-the-art polymer manufacturing technology. The single ply membrane is mechanically fastened or fully adhered to the roof deck with all seams hot air welded.
An EPDM rubber roof is the most popular and economical single-ply roofing membrane that has been in wide use for over 40 years. EPDM is a type of synthetic rubber that is made up mostly of oil based by-products with modifiers and stabilizers added to extend its service life. An adhesive is used to glue the roof to the roof deck and special tape is used to seal the seams. An EPDM roof is designed to be UV stable and to withstand inclement weather, ozone and heat. The roof is also resistant to tear, puncture, impact, and normal roof traffic. An EPDM roof is able to accommodate structural movement and remains pliable under a wide range of temperature fluctuations.
PVC, typically called vinyl, is made up of ethylene and chlorine. In the manufacturing process, biocides, plasticizers, ultra-violet light inhibitors, heat-stabilizers, color pigments and polyester or fiberglass reinforcement are added to enhance stability and flexibility, as well as achieve high tearing and breaking strengths. Distinctive to PVC membrane, making it more durable than EPDM are hot-air welded seams. A PVC roof is a premium single-ply roofing membrane, with superior durability, longevity and performance, and therefore costs more than an EPDM rubber roof. Hot – air welded seams make the membrane pliable and watertight under a variety of extreme weather conditions. A PVC roofing membrane is highly resistant to constant dampness, ponding water, as well as high and low alkaline conditions. A PVC roof is also resistant to UV radiation, strong winds, fire, and chemicals.
TPO membrane chemically bonds rubber, ethylene, and propylene as well as numerous filler materials. TPO is said to offer the best of both EPDM and PVC in one package. The material is closer to a rubber roof in cost, but also features welded seems for durability like PVC membranes.
Metal roofs can be made from tin, zinc, aluminum, copper, or galvanized steel and can be an attractive option because of their longevity, minimal maintenance, durability, and energy efficiency. However, despite their many advantages, metal roofs have some potential drawbacks, which include affordability, noisiness, expansion and contraction, and inconsistency of color.
Roof shingles are a roof covering consisting of individual overlapping elements. Shingles are made of various materials such as wood, slate, flagstone, fibre cement, metal, plastic, and composite material such as asphalt shingles. Roof shingles are a very common roofing material in the United States, specially on residential roofs. Shingles cannot be installed on flat roofs, since they do not allow for proper drainage.
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