A vapor barrier is to be placed below the slab in Problem 56. Determine the number of 10-foot by 50-foot rolls of vapor barrier needed. The vapor barrier needs to be lapped one foot.
What will be an ideal response?
Run the rolls the 30? direction. The 25? by 30? area will require three 10? by 30? pieces and the 15? by 20? area will require two 10? by 20? pieces. The length of the plastic is calculated as follows:
Length = 3 × 30? + 2 × 20? = 130?
Number of rolls = 130? / 50? = 2.6 – Use 3 rolls
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