Estimate Roof Size From Floor Plan

From the diagrams there are two intersecting roofs measuring 114 feet and 30 feet at the eaves with equal rake of 18 feet.

Estimate roof size from floor plan.

Now based on the info provided your home s floor plan is roughly 1 000 sq ft. Assuming a single story rectangular house with a hip roof that has two foot overhangs on each side of the house we have approximately 13 squares or 1 300 square feet of 2d roof surface area. This is a rather complicated way to estimate a roof area and hardly suited to the diy fans. The next thing to determine is the roof pitch see how to determine roof pitch the easiest and most accurate method to measuring a roof plan is to square everything off.

Anything more than 9 in 12 is considered steep. Steeper sloped roofs are considered more aesthetically pleasing and last longer. A 12 in 12 roof can cost up to 50 more than a 4 in 12 roof. These benefits do not come cheaply though.

A low slope roof is anywhere from 2 in 12 to 4 in 12. The roof area is simply 114x18x2 plus 30x18x2 giving 5184 square feet which is perfectly adequate for estimating materials. While it is possible to estimate the amount of necessary materials using only the total roof area measurement as can be seen from the table depending how large the pitch of the roof the actual area of the roof can differ by up to 2 236 from the measured total area at a pitch of 24 12. Multiply by the square footage of a single floor of your house.

In this drawing a 1 8 scale ruler is being used.