How many 4 x 12 x 2 plywood sheets are required for a square subfloor that is 36 x 36, factoring in 10% for waste?

How many 4 x 12 x 2 plywood sheets are required for a square subfloor that is 36 x 36, factoring in 10% for waste?

• A. 20
• B. 22.5
• C. 24.75
• D. None of the above

Answer: (D)

The main idea is to compare the total floor area to the usable area of the plywood sheets, then include waste and round up to whole sheets. First, convert the floor to square feet: 36 ft by 36 ft equals 1296 square feet. Each sheet covers 4 ft by 12 ft, which is 48 square feet. Ignoring waste, you’d need 1296 / 48 = 27 sheets. Now factor in 10% waste: 27 × 1.10 = 29.7 sheets. Since you can’t purchase a fraction of a sheet, you round up to 30 sheets. Thus, you’d need 30 sheets. That number isn’t listed among the options, so the correct choice is none of the above. The thickness (2 inches) doesn’t affect the area calculation for coverage.

The main idea is to compare the total floor area to the usable area of the plywood sheets, then include waste and round up to whole sheets.

First, convert the floor to square feet: 36 ft by 36 ft equals 1296 square feet. Each sheet covers 4 ft by 12 ft, which is 48 square feet. Ignoring waste, you’d need 1296 / 48 = 27 sheets.

Now factor in 10% waste: 27 × 1.10 = 29.7 sheets. Since you can’t purchase a fraction of a sheet, you round up to 30 sheets.

Thus, you’d need 30 sheets. That number isn’t listed among the options, so the correct choice is none of the above. The thickness (2 inches) doesn’t affect the area calculation for coverage.