principal roof

principal roof, principal rafter roof

A roof supported by principal rafters.
References in periodicals archive ?
Work done included fully recovering the principal roof, with modern sarking felt below French reed thatching, which was renewed at the time.
The two principal roof forms rise up in opposing orientations, with the studio along its length forming an open loft.
Slate had supplanted shingles as the principal roof covering by the early decades of the 14th century.

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