How many rolls of felt are needed for the roof shown in Figure 15.20? The slope of the roof is 5:12. The felt comes in rolls 36 inches wide by 134 feet long. The felt is lapped 6 inches. From Figure 14.48 in Estimating in Building Construction, the slope length factor is 1.083.
What will be an ideal response?
Run = 28?8? / 2 = 14?4?
Length of rafter = 14?4? × 1.083 = 15.52?
Area of roof = 2 sides × 15.52? × 38?8? = 1,200 sf
sf of felt in a roll = 36? × 134? / 12 in per ft = 402 sf
Exposure = 36? – 6? = 30?
Roll coverage = 402 sf × 30? / 36? = 335 sf
Rolls of felt required = 1,200 sf / 335 sf per roll = 3.6 rolls – Use 4 rolls
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