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Roofing Systems

Built-Up
There are basically two types of built-up roofing (also known as BUR). The difference is that either a coal tar pitch or asphalt waterproofing could be used as the waterproofing element between plies of reinforcing felt. There are advantages and disadvantages to each system.

Modified Bitumen
Membranes are hybrids of the built up-system, only pre manufactured in the factory. The products come in rolls, and are modified asphalt or coal tar systems with rubber added for low temperature and elongation characteristics. These products typically use a built-up membrane underlayment before application of the final modified bitumen membrane. Modified bitumen membranes can be torch applied, self adhered, or mopped in place with hot bitumen. They are always surfaced with some type of Topping System.

Single-Ply
Single Ply roofing systems are just that, a single-ply of a roofing material made from several types of polymer plastics and rubbers. TPO and PVC are commonly used materials in the single-ply category. Often a "cool roof" product.

EPDM
Ethylene Propylene Diene Monomer is manufactured into large sheets for application on a roof. The material can be loose laid and ballasted with rock or pavers to hold the membrane in place. It can also be fully or partially adhered as well. Seams and the membrane are adhered with contact adhesives, with seams sometimes sealed with a sealant. Toppings may or may not be required by the manufacturer in many cases.

Metal
Metal roofs are energy efficient. Standing seam roofs can be insulated with almost any amount of insulation. Add the radiant barrier effect to this and they are the most energy efficient of any roofing system. Fiberglass blanket insulation is installed directly under the panels and stretched over the supporting structural members to reduce energy costs and dampen noise. Foam insulation blocks also can be used between roof panels and substructures to prevent thermal loss, with a natural radiant barrier effect, and are long lasting, resist decay, discoloration, and mildew. Metal roofs come in several major types to include concealed fastener systems and mechanical lock and snap-lock assembly systems. Double-lock, batten seam, and t-panel are among the most common concealed fastener panels.