While a rain-proof roof can be made with our shingles, our system, as
well as all metal or slate roofing should not be put upon open sheathing.
If walked upon the metal will not support the weight, and bends out of
shape, and the roof is blamed. In high latitudes where we have driving
storms of fine snow or “blizzards,” _we specify close sheathing covered
by paper_ (_using same rules as for laying slate_). We will then
guarantee a perfect roof.
THE NATIONAL SHEET METAL ROOFING CO.,
510 to 520 East 20th Street, New York City.