Estimate Roof Size From Floor Plan

So continuing our example if you ve got a two story house with a total square footage of 2 700 square feet with each floor having.

Estimate roof size from floor plan.

In this drawing a 1 8 scale ruler is being used. Anything more than 9 in 12 is considered steep. A low slope roof is anywhere from 2 in 12 to 4 in 12. 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.

The roof area is simply 114x18x2 plus 30x18x2 giving 5184 square feet which is perfectly adequate for estimating materials. A 12 in 12 roof can cost up to 50 more than a 4 in 12 roof. These benefits do not come cheaply though. From the diagrams there are two intersecting roofs measuring 114 feet and 30 feet at the eaves with equal rake of 18 feet.

The roof below is drawn in 1 8 scale this means that if using a regular tape measure that 1 inch would equal 8 feet. Multiply by the square footage of a single floor of your house. This is a rather complicated way to estimate a roof area and hardly suited to the diy fans. Now based on the info provided your home s floor plan is roughly 1 000 sq ft.

Conventional slope roof range between 4 in 12 and 8 in 12.