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Question DetailsAsked on 2/3/2016

what is the average square foot roof area of a 2000 square foot house? your question...

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"Average" would not be a real meaningful number - depends too much on the overhang and the shape of the house and roof slope. For instance - a 20x100 house with 3 foot overhangs would have 26x106 foot plan on the roof, or 2756 SF for a flat roof. Take that to a 12:12 pitch and the actual roof square footage goes up to (assuming peaked along the 100' dimension) 3896 SF.

Change the 2000SF dimensions to 45x44.4 feet with ridge along the 45' dimension, you get 51x50.4 roof plan footage = 2570 SF flat, or 3635 at 12:12 slope.

Just those two examples give you a range of from 1.3 times footprint square footage to almost 2 times, for a one story house. Take away overhangs and of course the ratio can go as low as 1.0. Of course, for a two story the ratio goes down to roughly half those and even less with three stgory or some multi-level designs - so an "average" ratio is meaningless - you have to actually measure or at least estimate using the surface area of the roof based on top story area as above, overhangs including any stepped or dormer roofs), and the difference between slope dimension and plan dimension (remember the Pythagorean Theorem from school ?)

Answered 4 years ago by LCD

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