Types of Roofing - Roof Repair & Roof Installation in Boston

EPDM Roofing Basics
EPDM roofing is short for Ethylene Propylene Diene Monomer roofing - otherwise known as rubber roofing. An EPDM roof is a single-ply membrane, meaning there is only one layer of roofing material. EPDM thickness ranges from 30 mils to 100 mils, with the most common thickness being 45 or 60 mils.

Relatively inexpensive, EPDM roofing has been common in the U.S. since the 60's, and is one of the most frequently used types of roofing materials for a low-slope or flat roof. EPDM roofing also features enhanced durability and versatility, and is typically considered easier to install, maintain and repair than most other types of roofing materials. Rubber roofing can give your company or home an inexpensive option when considering roof installations.

EPDM Membrane Roof Repair & installation
There are 3 standard procedures for EPDM membrane roof installation. First, there is fully-adhered membrane, which uses water or solvent-based adhesives to adhere the membrane to the roof base. Next, there is mechanically-fastened membrane, which is attached by mechanical means to the roof base. Finally, there is loose-laid membrane, for which installation requires that the membrane be secured to the roof base only at the perimeters or any point of penetration. A. C. Roof Repair's EPDM roofing ensures both quick and efficient installation & repair and superb quality.

Advantages Over Asphalt Flat Roofing Systems
This application of membrane roofing show distinct advantages over the previously more common flat roofing method of asphalt and gravel. In asphalt and gravel application, it can be very difficult to create a proper seal at all seams and connection points. This can cause many roofs to leak early in its lifespan, and require much more maintenance. When installed correctly, newer materials are either seamless, or have seams as strong as the body. This eliminates much of the leakage concerns associated with flat roofing systems. Repairs for asphalt and gravel roofs can be hard, mainly because it is difficult to locate the exact point of a leak. Newer systems can be patched relatively easily, and breaks and leaks are easier to locate. Originally asphalt roofing required a layer of gravel above it for two reasons. First, asphalt with direct exposure to sunlight degrades much faster, mainly due to the expansion and contraction throughout a day, and also the damage created by UV rays. Second, asphalt needs weight above to hold it down, because it sits on the top of a building, instead of being attached to it. Each of the three newer types of membrane roofing systems contain materials that resist expansion and contraction, as well as reflect much of the UV rays. Also, because these membranes either lack seams or have strong seams, what expansion and contraction does occur does not create leaks and breaks at these seams. These newer roofing systems are also attached directly to the top of a building, which eliminates the need for excess weight above.

Modified Bitumen – Heat-welded, asphalt-adhered or installed with adhesive. Asphalt is mixed with polymers such as APP or SBS, then applied to fiberglass and/or polyester mat, seams sealed by locally melting the asphalt with heat, hot mopping of asphalt, or adhesive. Lends itself well to most applications.

Built-up Roof – Multiple plies of salt-saturated organic felt or coated fiberglass felts. Plies of felt are adhered with hot asphalt, coal tar pitch or adhesive. Although the roof membrane can be left bare, it is typically covered with a thick coat of the water-proofing material and covered with gravel. The gravel provides protection from ultra-violet degradation, stabilizes the temperature changes, protects surface of the roof and increases the weight of the roof system to resist wind blow-off.

Roof Coating
A roof coating is a monolithic, fully adhered, fluid applied roofing membrane. It has elastic properties that allows it to stretch and return to their original shape without damage. Typical roof coating dry film thickness varies from paint film thickness (plus or minus 3 dry mils) to more than 40 dry mils. This means a roof coating actually becomes the top layer of a composite roof membrane and underlying system. As such, the roof coating is the topmost layer of protection for the membrane, receiving the impact of sunlight (both infrared and ultraviolet (UV), rain, hail and physical damage.

Benefits of Roof Coating
Roof coatings are seamless and when installed correctly, can solve roof leaks on almost any type of roof substrate. Field-applied reflective roof coatings can extend the useful life of nearly every roof substrate keeping a roof surface cool and providing a level of protection from the sun and weather. The National Roofing Contractors Association’s (NRCA) director of technical services has approved roof coatings in all states in the U.S.

Roof coatings can add 25 years to the service life of a roof and reduce the amount of discarded roofing materials that end up in landfills. The infrared image on the right shows "175°F" on the uncoated (black) section of the modified bitumen roof. The coated (white) section is "79°F". Field studies have shown that cool roof coatings can lower rooftop temperatures and reduce air conditioning bills.


A.C. Roof Repair specializes in residential roofing, commercial roofing, flat roofs & flat roof repair,
roof coatings, shingle replacement, metal roofing, rubber roofs, EPDM, tar & gravel roofing, & hail damage repair.

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