Fascia board:

Timber (or plastic) boarding applied to the edge of the roof at eaves level, often behind the gutter.

Fire door:

A door of suitable construction to withstand the passage of fire for a specified period (e.g. half-hour fire door).

Firrings:

Tapered sections of timber fixed above the joists of a flat roof, designed to provide a slight fall on the roof for drainage purposes.

Flashings:

Narrow strips of metal, usually lead, dressed into the base of a chimney stack to prevent water penetrating at the junction with the roof.

Flaunching:

Cement based compound applied to the top of a chimney stack, in which the chimney pots are bedded.

Floating floor:

A solid based floor with a timber or other floor finish located over a layer of insulation.

Floor screed:

The top surface or layer of a solid floor.

Flue:

A duct within a chimney or an independent pipe which conducts smoke or exhaust gases from a fire, boiler or heating appliance.

Footing:

A traditional name for a foundation, where the base of a wall is thickened with brickwork, stone or concrete to spread to load into the ground.

Foundation:

A structural device below ground level, usually of concrete construction, designed to support and transfer the weight of the building into the ground.