How many pieces of 4 x 8 sheathing are required for a net area of 1220 sq. ft. if no allowance is made for waste?

To determine how many pieces of 4 x 8 sheathing are needed for a net area of 1220 square feet, we first need to calculate the area of a single piece of sheathing. A 4 x 8 sheet measures 4 feet in width and 8 feet in length, so its area can be calculated as follows:

Area of one sheet = width x length = 4 ft x 8 ft = 32 square feet.

Next, to find out how many sheets are required to cover a total area of 1220 square feet, we divide the total area by the area of one sheet:

Number of sheets required = Total area / Area of one sheet = 1220 sq. ft. / 32 sq. ft. = 38.125.

Since you cannot have a fraction of a sheet when calculating the number of whole pieces needed, we round up to the nearest whole number. This means you would need 39 sheets of sheathing to cover the area of 1220 square feet.

The correct answer reflects this calculation, indicating that 39 pieces are required with no allowance made for waste.