Mats or felts used as a membrane backer and composed of fibers.
Fleet angle
Angle at which a hoisting rope diverges from being vertical.
Flemish bond
Method of brick laying where the long and short sides of bricks are set alternately using one, than the other, and staggering the rows above and below, so that the short side is above the long side of the surrounding rows.
Flex
To bend or contract. The ability to move into a different position, temporarily.
Flex "t" handle
The flex "t" handle is a long-handled drive tool that can provide the extra torque that is sometimes necessary to loosen stubborn nuts and bolts.
Flex coupling
Rubber coupling used to join DWV Pipe. Can be used to connect PVC to Clay or Cast Iron above or below ground. Also used for repairs, and attach by used of steel band clamps.
Flex drive
A wrench, which is on a flexible rod that is used to turn sockets at an angle.
Flex duct
Usually installed in a single, continuous piece between the register and plenum box, a flexible duct usually has an inner lining and an insulated coating on the outside.
Flex head ratchet
With a flex head ratchet the ratchet head flexes 0 degrees to 90 degrees, permitting the user to work around obstructions.
Flexibility
Ability of a coating to expand and contract during temperature changes.
