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Bowlegs, zigzags ... there's a reason.

Bowlegs, zigzags . . . there's a reason

A dramatically sculpted wall supports a 15-foot-high roof extension, creating a covered side porch on this house in Petaluma, California. Despite the extra-wide footings and zigzagging base, the construction, by architect Tom Ward, is deceptively simple.

At the top, a triangular truss matches the pitch of the house roof. A post hidden in each angled leg supports the truss. Besides giving visual interest, the angled sections strengthen the wall against side-to-side movement (shearing). Three 4-by-8 beams tie the wall to the house.

For a roof, Ward mounted lightweight translucent fiberglass to a grid of 2-by-4s. The panels provide shelter and let diffused light reach below and indoors.

Photo: Slightly bowlegged open wall supports light-diffusing fiberglass roof. Above woodpile, horizontally hinged triangular wall vents greenhouse

Photo: Built-in light beneath cutouts at peak provides nighttime illumination that washes roof and patio below
COPYRIGHT 1984 Sunset Publishing Corp.
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Copyright 1984 Gale, Cengage Learning. All rights reserved.

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Title Annotation:greenhouse design
Date:Oct 1, 1984
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