Coal Tar Pitch Roofing Handbook - 1896 - Page 30
While the foregoing photographs show copper flashings in one piece of metal, in the best practice against brick walls where the roof is laid over wooden beams the flashing metal is used in two strips, base and cap. The cap should be built in the wall not less than 2 inches with a downward flange of about four inches as shown in the following illustration.
The base piece which turns out four inches on the flat stands up against the wall 6 to 10 inches and under the cap about 2 or 3 inches, thus fully providing for the shrinkage of the roof beams and boards.
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