B/L
Abbr. for bill of lading
A door carrying a certification from the Underwriters Laboratories, Inc. that it meets the requirements for a class-B door.
A metal screed having expanded or short perforated flanges; acts as a dividing strip between plaster and cement; provides a
Saturated and/or coated felt sheeting which is laid as the first ply in a built-up roofing membrane.
A molding used next to the floor on interior baseboard.