How many rolls of R-19 insulation are required to insulate the floor shown in Figure 15.14? The insulation comes in rolls 15 inches wide by 56 feet long.

What will be an ideal response?


Find the area of the floor as follows:

sf of floor = 40? × 28? – 8? × 6?6? = 1,068 sf

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

Rolls of insulation = 1,068 sf of floor / 75 sf of coverage per roll = 14.24 rolls – Use 15 rolls

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