San Francisco : Architect and Engineer, Inc · leaf 196
le, placed nearthe edges of the shingles and not more thanthree Inches above the butts. No. I Shingle Top Course No. 2 or No. 3 ShingleUnder-Course WEATHER EXPOSURES12 for 16 Shingles14 for 18 Shingles16 for 2U Shingles Two Noils to Q Shingle,nailed 2 above BuH-lineand -^/ii from edge The exposed… … *j Building Paper Outer-Course V2 lowerIhon Under-Course CONSTRUCTION DETAILS OF DOUBLECOURSING The following table shows the reason why thedouble-coursing is economical due to thegreater allowable exposure of the shingles: LENGTH OFSHINGLES (in inches) 161824 EXPOSURE OF SHINGLES (in inches)…
Architecture · Building
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