Factory Mutual Research Corporation (FMRC): As it relates to roofing - a division of Factory Mutual System that tests and classifies roof components and systems for their resistance to fire, traffic, impact, weathering, and wind-uplift.

Factory Seam: A splice/seam made in the roofing material during the manufacturing process. It is preferable during installation to cut these splices out of the membrane.

Fading: Losing brightness or brilliance : dim

Fallback: A reduction in the softening point temperature of asphalt that occurs when asphalt is overheated for pro-longed periods of time.

Fascia: Vertical roof trim located along the perimeter of a building, usually below the roof level. Its use can be either decorative or for waterproofing.

Fasteners: Devices, such as screws or nails, used to mechanically secure roof system components.

Feathering Strips: Strips of wood that are placed along the butt ends of wood shingles to form a relatively smooth surface so that the shingles can be roofed over without removal.

Felt: A roofing sheet made of interwoven fibers. The fibers can be wood or vegetable for Organic Felts, glass fibers for fiberglass felts, polyester, or asbestos.

Felt Machine: A machine that will simultaneously install bitumen and felt in a built-up roof application.

Ferrule: A metal sleeve used as a spacer to help a gutter retain it’s shape when secured with spikes.

Fiberglass Insulation: Insulation composed of glass fibers used to insulate walls and roofs. It can be formed into a rigid boards (generally used in roof applications) or blanket insulation.

Field of the Roof: Refers to the main roof area, excluding flashings.

Field Seam: A non-factory material seam made by joining overlapping seams together with adhesives, heat welders, or by other means.

Filler: An inert ingredient added to roofing materials in order to alter their physical characteristics.

Fillet: A sealant material installed at horizontal and vertical planes to ease 90กใ angles.

Fin: A sharp protrusion in a roof deck that can damage roof components.

Fine Mineral-Surfacing: A fine mineral material on the surface of roofing materials to prevent them from sticking to surfaces.

Fishmouth: (1) A half-cylindrical or half-conical opening (resembling a fishes mouth) formed in roofing felts by an edge wrinkle; (2) in shingles, a half-conical opening formed at a cut edge.

Flame Retardant: A substance used to impede a material’s tendency to burn or ignite.

Flame Spread: Per ASTM E 84, a measure of relative combustibility. The flame spread of a tested material is rated relative to asbestos cement board (flame spread = 0) and red oak flooring (flame spread = 100).

Flammability: The ability of a material to burn or ignite.

Flange: A projected edge at the base of a roof flashing component such as flashings. The flange is generally turned out at a right angle to the flashing component and is used to secure and seal the component to the roof membrane.

Flash Point: The lowest temperature of a liquid material at which combustion will occur when air reaches its surface.

Flashing: Components used to seal the roof system at areas where the field membrane intersects vertical surfaces or is otherwise interrupted by adjoining walls, curbs, roof drains or pipe penetrations. Flashings are most commonly formed of flexible roof membrane or metal.

Flashing Cement: A trowelable mixture of solvent-based bitumen and mineral stabilizers. Flashing cement that may contain asbestos stabilizers is categorized by ASTM standard D 2822-91 (1997) or for non-asbestos, ASTM standard D 4586-93. Flashing Cement is the term for Asphalt Roof Cement that can be used on vertical surfaces and has a high softening point, low ductility and conforms to the requirement of ASTM Specification D 312, Types II or III; or Specification D 449, Type III. See also Asphalt Roof Cement and Plastic Cement.

Flashing Collar: A flashing component used to seal pipe penetrations. Also referred to as a flashing sleeve.

Flat Lock: A type seam formed at the intersection of two adjacent metal sheets by folding one edge over on top of itself and the folding the other down under itself and then locking the panels together.

Fleece: Mats or felts used as a membrane backer and composed of fibers.

Flood Coat: The surfacing layer of bitumen into which aggregate is embedded on an aggregate-surfaced built-up roof. A flood coat is applied at an approximate rate of 45 to 60 pounds per square (100 square feet).

Flood Test: A water test performed to determine the watertight integrity of a roof system or component.

Fluid-Applied Elastomer: A liquid elastomeric material that cures to form a continuous waterproofing membrane.

FM: Acronym for Factory Mutual Research Corporation.

Framed Opening: A structurally-framed opening in a roof deck, formed to facilitate the installation of large items such as HVAC units, skylights, or ventilators.

Froth Pack: A term used to describe small, disposable aerosol cans of sprayed polyurethane foam (SPF).


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