Commercial Roof Systems
The EPDM (ethylene propylene diene terpolymer) single-ply rubber roofing membrane has been an appealing choice of the low-slope commercial roofing industry for over 40 years.
EPDM has gained industry-wide acceptance and respect by providing immediate and long-term roofing solutions. As environmentalists and code regulators place more emphasis on the sustainable performance of building materials, EPDM continues to be the roofing material that stands the test of time.
TPO membranes are single-ply roof membranes constructed from ethylene propylene rubber. They are designed to combine the durability of EPDM rubber with the proven performance of hot-air weldable seams. They have been tested as having excellent resistance to ozone, are algae-resistant, environmentally friendly and safe to install.
TPO is highly resistant to tears, impacts, and punctures with good flexibility to allow for building movement. TPO's are available in white, light gray and some manufactures will create custom colors with thicknesses of 45 mils, 60 mils, .080 mils and even 120 mils The width of the membrane depends on the manufacturer but they usually come in multiple widths depending on project and up lift rating required to meet building code requirements.
TPO membranes are installed fully-adhered, mechanically-attached or ballasted. Fully-adhered means that the roof is "glued" to the substrate using a special adhesive. What actually happens is the glue creates a chemical bond with the membrane. Ballasted simply means the membrane is loose laid over the top of the roof, sealed at all penetrations and around the perimeter, and then a ballast is put on it to hold it in place. Ballasted (Does not meet new FL building code requirements) Sometimes concrete pavers can be used for patio style deck, these pavers average 20 pounds per square foot and requires special planning. Mechanically-attached membranes are most common and use multiple type of special screws and plates to secure the system. The type of fastener will depend on the type of substrate but all fasteners are generally screw-type fasteners.
PVC is a roof membrane composed of only one layer of material, polyvinyl chloride. PVC roofs are specially designed to withstand ponding water- PVC membrane is welded together with hot air (no open flame) to eliminate all seams so moisture cannot pass through. PVC roofing systems also reflect nearly 80% of the heat of the sun, thus lowering energy costs substantially, especially in high-heat areas such as the southwestern United States. The system can be installed 3 typical ways, it can be fully adhered to the insulation or substrate mechanically attached to the deck and ballasted (not allowed in high wind areas such as Florida).
B U R
Built-Up Roof: Built up roofs are used when the pitch is no more than 3 inches rise to 12 inches run. Bur roof consist of multiple plies of roof felts laminated together with bitumen. Built-up roof material can consist of bitumen-saturated felt, coated felt, polyester felt or other fabrics. A surfacing is generally applied and can be asphalt, aggregate (gravel or slag), emulsion or a granule-surfaced cap sheet. Built-Up Roofing is one of the oldest and most reliable ways of installing a new roof. B.U.R.’s come in two basic types, asphalt and coal tar, and three basic components – (1) the waterproofing component, (2) the reinforcing component, and (3) the surfacing component which is used to protect the other components from the elements. Built-up roofs are rated by how many layers are applied, usually between 3 and 5 layers are considered standard.
Modified Bitumen (MB) is asphalt that has had modifiers added to it to give it plastic or rubber-like properties. The most common types of modifiers being used are APP (Atactic Polypropylene) and SBS (Styrene Butadiene Styrene).
Modified bitumen roof systems consist of one, two, or three ply systems. The type of substrate will often determine the type of system being installed. Modified membranes can also be installed in conjunction with built-up roof materials (such as multiple plies of fiberglass felt) to form a "hybrid" roof system. Modified bitumen roofs have proven performance on residential, commercial, and industrial applications. There are a wide range of reinforcements used in SBS roofing materials. These include fiberglass or polyester mats and scrims, or combinations of both. The fiberglass mats range in weight from 1.0 to 2.5 pounds per 100 square feet or around 50 to 125 grams per square meter. Polyester reinforcements range in weight from 3.5 to 5.0 pounds per 100 square feet or 170 to 250 grams per square meter. The type of reinforcement used depends on the material’s performance requirements warranty lengths and what the roof system will be subjected to in its life time. SBS membrane come in a variety of colors, the most common is white but can also have a variety of surface finishes applied at the factory or in the field. SBS membranes can be hot asphalt applied, torch applied, or cold process applied.
APP membranes are applied using a torch and torch only. The back of the sheet has extra asphalt and burn release film on it which, when heated, bonds to the substrate. This was especially convenient for the smaller, more cut up roofs because less room and equipment is needed on site to torch-apply a membrane than is necessary for application using hot bitumen. These membranes use polyester reinforcements and range in weight from 3.5 to 5.0 pounds per 100 square feet or 170 to 250 grams per square meter. The weight of asphalt used depends on the material’s performance requirements warranty lengths and what the roof system will be subjected to in its life time. APP membrane come in a variety of colors, the most common is white but can also have a variety of surface finishes applied at the factory or in the field.
Metal roofing has been one of the fastest growing parts of the roofing industry. Its popularity is increasing everywhere due to its many positive attributes, color ranges not to mention the various style and shapes they will no accommodate new building styles and designs (barrel or arched, radius, tapered and even compound shapes). While a premium metal roof costs more initially than many other roofs, it can be a great investment in the long run. Not only are metal roofs long lasting, they can also increase a home’s resale value, decrease a home’s and or buildings energy consumption (by up to 40%), and in some areas, reduce the home owner insurance premiums immensely with higher wind ratings.