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.

Now based on the info provided your home s floor plan is roughly 1 000 sq ft. 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. Anything more than 9 in 12 is considered steep. A low slope roof is anywhere from 2 in 12 to 4 in 12.

Multiply by the square footage of a single floor of your house. The roof area is simply 114x18x2 plus 30x18x2 giving 5184 square feet which is perfectly adequate for estimating materials. In this drawing a 1 8 scale ruler is being used. This is a rather complicated way to estimate a roof area and hardly suited to the diy fans.

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. Conventional slope roof range between 4 in 12 and 8 in 12. Steeper sloped roofs are considered more aesthetically pleasing and last longer. 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 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.