Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 135
epost would have to be well bedded in theground. Span, Couple=close, and Collar-beamRoofs. Next to the lean-to, the simplest form ofroof construction is that known as the span But the more common method is to introduce purlins, one on each side of theroof, so as to support the centre of therafters.… … Fig. 439.—Section through Span Roof withCollar Braces. or couple roof, consisting of two raftersfixed at the required pitch or inclination, andfastened at the feet to plates embedded onthe tops of the walls, while their heads areeither halved and pinned together, or nailedto a ridge-board. Such…
Carpentry · Joinery
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