Estimate Roof Size From Floor Plan

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

Estimate roof size from floor plan. 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. 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. Anything more than 9 in 12 is considered steep. A 12 in 12 roof can cost up to 50 more than a 4 in 12 roof.

Now based on the info provided your home s floor plan is roughly 1 000 sq ft. The roof area is simply 114x18x2 plus 30x18x2 giving 5184 square feet which is perfectly adequate for estimating materials. 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. 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.

From the diagrams there are two intersecting roofs measuring 114 feet and 30 feet at the eaves with equal rake of 18 feet. These benefits do not come cheaply though. This is a rather complicated way to estimate a roof area and hardly suited to the diy fans. 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.

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