principal roof

principal roof, principal rafter roof

A roof supported by principal rafters.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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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.
* Principal roof areas are designated with a "green" roof--a layer of soil over the top of the membrane houses grasses and other plants--and serves as an adjacent landscape for tenants and visitors at the public outdoor terrace.

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