weatherboarding having its upper edges narrowed to fit into grooves or rabbets in its lower edges, and its backs flat against the sheathing or studs of the wall.
Also called novelty siding.
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Examples from the Web for drop siding
Historical Examples of drop siding
Over this paper place any kind of boards that the fancy of the builder may dictate, as clapboards, shiplap, or drop-siding.Secrets of Wise Men, Chemists and Great Physicians
William K. David