General

General

backfill

Soil which is replaced in an area that has been excavated previously.

General

backbend

1. Same as backband. 2. At the outer edge of a metal door or window frame, the face which returns

General

backboard

A temporary board on the outside of a scaffold.

General

back-mop

To mop the back or underside of roofing felts with asphalt or tar when laying a built-up roof.

General

back-nailing

Nailing the plies of a built-up roof to the substrate (in addition to hot mopping) to prevent slippage. back nut

General

back-paint

To paint the reverse or hidden side of an object, usually for protection against the weather.

General

back-draft damper

A damper, 1 having blades which are actuated by gravity, permitting air to pass through them in one direction only.

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