In modern rolled bituminous materials cardboard which eventually collapses was replaced with glass fiber glass half or synthetic fabric.
Roll roofing material impregnated.
Otherwise the safest minimum pitch for rolled roofing is 2 inches of decline per 12 inches of horizontal direction 2 12 pitch.
Now almost not produced and is not used due to the fact that tar is a carcinogen.
Rolled roofing material is often used on roofs that are low sloped.
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If your roof pitch declines up to 1 inch vertically for every 12 inches horizontally 1 12 pitch it is a good candidate for rolled roofing as long as you use the concealed nail method of fastening.
This material is similar to pergamin only as impregnation coal tar was used.
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