Insulating board of firm plastic foam, which is often used in the walls of a building to protect against the transfer of heat or cold through the walls.
Foam stop
The edge metal used to terminate Sprayed Polyurethane Foam.
Foamed-in-place insulation
Synthetic material, which is used in places where it is difficult to use sheet installation. A two-part liquid, which forms a chemical reaction that causes rapid expansion of the foam, fills up the area, after it is mixed and applied or applied from a pressurized container.
Foil
(1) A very thin sheet or leaf of metal. (2) A leaf-like, rounded space or design in windows, doors, etc. of gothic architecture.
Foil-backed panel
Gypsum drywall panels that increase the insulating value by being backed with a foil vapor barrier.
Folded seam
In sheet metal work, a joint between sheets of metal wherein the edges of the sheets are crimped together and folded flat.
Folding door
Door that is manufactured in multiple sections that are hinged and fold back as they are slid open. Ceiling tract mounting is preferable so that the weight of the doors can be held more firmly and without sag.
Folding partition
Room divider, which is hinged, and folds back to the wall as it is slid open. Ceiling tract mounting is preferable so that the weight of the divider can be held more firmly and without sag.
Folding rule
Generally with a folding rule two styles are available, one for inside and one for outside reading. Each is comprised of twelve slats with 1/16th inch graduations on top and bottom, stud center markings every 16 inches, brass strike plates for long wear and spring-actuated joints for positive locking when the rule is opened.
Folding stairs
Retractable stairway that folds up into an overhead opening, when not in use. Often used as attic stairs, they can be pulled down for use and stored out of the way at other times.
