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FLAT ROOFS FLASHINGS

Unseen and often overlooked, flat roofs require routine maintenance and detailed repair to effectively prevent water infiltration.

Many institutions have some type of flat (or low-sloped) roof that is only inspected after a leak occurs. And while they are not as glamorous or visible as slate, tile, or copper roofs, flat roofs are just as important and even require more attention. To avoid wasting large sums of money on short-lived repairs (especially those using roofing tar), it is important to understand how flat roof systems are designed, the various types of roofs available, and the importance of routine inspection and maintenance.

Flat roof systems work by providing a waterproof membrane over a building. They consist of one or more layers of hydrophobic material placed over a structural deck with a vapor barrier typically placed between the deck and roof membrane. Flashing, thin strips of material such as copper, intersect with the membrane and other building components (such as the parapet walls) to prevent water infiltration. Water is directed to drains, downspouts, and gutters by the slight pitch of the roof.
Types of Flat Roofs

The four most common types of flat roof systems, listed in order of increasing durability and cost, are: roll asphalt, single-ply membrane, multiple-ply or built-up, and flat & hot tar;seamed metal. They range in cost from as low as $2 per square foot for roll asphalt or single-ply roofing applied over an existing roof to $20 per square foot or more for new metal roofs.

Asphalt roll roofing, used since the 1890s, generally consists of one layer of asphalt-saturated organic or fiberglass base felts, applied over roof felt with nails and cold asphalt cement, and usually covered with a granular mineral surface. Seams are typically covered with a roofing compound. Roll asphalt lasts about 10 years. Minor maintenance and temporary repairs such as small patching can sometimes be performed by knowledgeable building staff or volunteers. Permanent repairs and re roofing should be performed by a qualified contractor.

Single & hot tar;ply membrane roofing is the newest type of roofing material and is often used to replace multiply & hot tar;ply roofs. Hundreds of proprietary products are on the market, including modified bitumen (bitumen is a class of cementitious substances found in asphalts or tars), rubberized asphalt, elastomeric membranes such as ethylene propylene diene monomer (EPDM), and polyvinyl chloride (PVC) sheets. They may be self & hot tar;adhered, installed with hot asphalt, or installed by heating the underside of the sheet with a propane torch or other device. Installation and repairs should only be performed by roofers authorized by the manufacturer. Warranties of 10 to 12 years are typical, but as with any roofing system, proper installation is crucial and maintenance by the owner is still required.

Multiple-ply or built-up roofing (BUR) is composed of overlapping rolls of saturated or coated felts or mats, interspersed with layers of bitumen, and generally surfaced with a granular roofing sheet, ballast, or tile pavers to protect the underlying materials from weathering. Built & hot tar;up roofs are designed to last 10 to 30 years, depending on the materials used. Ballast (also called aggregate) of crushed stone or water-worn gravel is embedded in a coating of asphalt or coal tar. However, since the ballast or tile pavers cover the membrane, inspecting and maintaining the seams of the roof can be difficult.

Flat-seamed metal roofing, used since the 19th century, is made from small pieces of sheet metal soldered flush at the joints. It can last many decades, depending on the quality of the material, maintenance, and exposure to the atmosphere. Galvanized iron requires regular painting to avoid corrosion. Split seams must be resoldered. Metal surfaces, such as copper, can become pitted and pinholed from acid rain and generally require replacement. Copper, lead-coated copper, and terne-coated stainless steel are favored today for long-lived roofs especially for those in inaccessible or seldom-inspected locations.

KINDLY FILL OUT THE FOLLOWING INFORMATION AS COMPLETELY AS POSSIBLE SO THAT WE MAY BETTER SERVE YOU. OR JUST SIMPLY E-MAIL US OR CALL

Roof type:

Approx height of flashing:

Approx lenght of flashing:

Lft.

How tall is the building? :

What is the approximate age of your roof? :

When do you prefer the service to be performed? :