Question

If you have a house being built which has a footprint of 25'wide X 40' long (including the overhanging

eaves) with a roof pitch of 5/12, how high would the center of the house be above the top of the wall
(roof rise)? How many sheets of 4'X8' plywood would you need to cover the roof (count any partial
sheets as a full sheet)?

Answer 1

The roof rise is 10 feet. This is because the pitch of the roof is 5/12, which means that for every 12 inches of horizontal run, there are 5 inches of vertical rise. To calculate the roof rise, you can use the following formula:

Roof rise = 12 inches / 5 inches x 10 feet = 10 feet

To calculate the number of sheets of plywood needed to cover the roof, you can use the following formula:

Number of sheets = Roof area / Plywood area = 40 feet x 25 feet / 4 feet x 8 feet = 20 sheets

However, you should note that this is just an estimate, as you may need to cut some of the plywood sheets to fit the roof.

Explanation: