their edge-rolls are locked together. Thescroll, or partly open tube, on each edge,is about three-fourths of an inch indiameter; and it will at once be ob-served, that it is perfectly water-proof. i¥i … 538 The Architectural Review and American Builders Journal. [Feb., It is likewise evident, that, if any damp-ness should exist beneath the roof, itwill escape at this point. Fig. 4 represents the cleat used forfastening the sheets in place. It is
Architecture
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