Flammability
The ability of a material to resist burning.
Flanking Paths
Paths by which sound travels around an element intended to impede it, usually some structural component that is continuous between rooms and rigid enough to transmit the sound. For example, a partition separating two rooms can be "flanked" by the floor, ceiling or walls surrounding the partition if they run uninterrupted from one room to the other. Ducts, conduits, openings, structural elements, rigid ties, etc., can be sound flanking paths. The acoustic effect of sound flanking paths is dependent on many factors.
Flame retention burner
An oil burner, designed to hold the flame near the nozzle surface. Generally the most efficient type for residential use.
Flammable
Capability of a combustible material to ignite easily, burn intensely or have rapid rate of flame spread.
Flame Spread Rate
The rate at which flames will spread across the surface of a material.
Flake board
A manufactured wood panel made out of 1"- 2" wood chips and glue. Often used as a substitute for plywood in the exterior wall and roof sheathing. Also called OSB or wafer board.
Flagstone (flagging or flags)
Flat stones (1 to 4 inches thick) used for walks, steps, floors, and vertical veneer (in lieu of brick).
Flame Spread Rating
A numerical designation given to a material to indicate its comparative ability to restrict flaming combustion over its surface.
Flash Point
The temperature at which a flammable material will suddenly break into a flame.
Flame Spread
Index of the capacity of a material to spread fire under test conditions, as defined by ASTM Standard E84. Materials are rated by comparison with the flame-spread index of red oak flooring assigned a value of 100 and inorganic reinforced cement board assigned a value of 0.
Flat paint
An interior paint that contains a high proportion of pigment and dries to a flat or lusterless finish.
Flatwork
Common word for concrete floors, driveways, basements, and sidewalks.
Flat mold
Thin wood strips installed over the butt seam of cabinet skins.
Flashing
Sheet metal or other material used in roof and wall construction to protect a building from water seepage. Strips of metal or waterproof material used to make joints waterproof, as in the joining of curtain wall panels.
Flash Set
Very rapid setting of the cement in concrete.
Flocked Construction
Carpet formed by electrostatically spraying short strands onto an adhesive-coated backing material.
Floating wall
A non-bearing wall built on a concrete floor. It is constructed so that the bottom two horizontal plates can compress or pull apart if the concrete floor moves up or down. Normally built on basements and garage slabs.
Floating
The next-to-last stage in concrete work, when you smooth off the job and bring water to the surface by using a hand float or bull float.
Float Process
A glass manufacturing process in which the molten glass ribbon flows through a furnace supported on a bed of molten metal.
Float
A flat hand tool used to smooth the surface of freshly placed concrete after it has been leveled with a darby.