How many rolls of felt are needed for the roof shown in Figure 15.19? The slope of the roof is 4:12. The felt comes in rolls 36 inches wide by 67 feet long. The felt is lapped 19 inches.
What will be an ideal response?
From Figure 14.48 in Estimating in Building Construction, the slope length factor is 1.055.
Run = 28? / 2 = 14?
Length of rafter = 14? × 1.055 = 14.77?
Area of roof = 2 sides × 14.77? × 34? = 1,004 sf
sf of felt in a roll = 36? × 67? / 12 in per ft = 201 sf
Exposure = 36? – 19? = 17?
Roll coverage = 201 sf × 17? / 36? = 94.9 sf
Rolls of felt required = 1,004 sf / 94.9 sf per roll = 10.6 rolls – Use 11 rolls
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