How many rolls of R-19 insulation are required to insulate the roof of the residence shown in Figure 15.18? The insulation comes in rolls 15 inches wide by 56 feet long. The insulation is installed between the ceiling joists, which are run horizontally and are spaced 16 inches on center.

What will be an ideal response?


Find the area of the ceiling as follows:

Area of ceiling = 36? × 26? – 4? × 12?6? = 886 sf

Effective coverage per roll = 16? × 56? / 12 in per ft = 75 sf

Rolls of insulation = 886 sf of ceiling / 75 sf of coverage per roll = 11.81 rolls – Use 12 rolls

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