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ridgeboard, ridgepole

A longitudinal member at the apex of a roof which supports the
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
To assemble the rafters, nail opposite pairs to the ridgeboard and to the top plates of the walls.
Nail a temporary second brace running at an angle from a cross tie to the ridgeboard near the first set of rafters.
This will level your ridgeboard, so you can fill in the remaining rafters one pair at a time.