Coal Tar Pitch Roofing Handbook - 1896 - Pages 26 and 27
THE photograph on the following page shows the “Sawtooth" construction on a mill erected in 1901 having a pitch of 5 ½ inches to the foot.
Where the pitch of such a roof does not exceed 4 ½ inches to the foot, follow the Barrett Specification using Slag.
At over 4 ½ inches keep the pitch of the roof down to the lowest point consistent with the area of skylight required and consult an experienced roof contractor, as the Specification must necessarily vary with the pitch of the roof.
Good results can be shown by experienced contractors at 12 inches to the foot (45 degrees) but as you increase the pitch, you increase the cost per square foot.
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