Find the area

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Originally Posted by HoneyBadger

But if the roof were flat, the area would be 1001-ish sq units (sq ft... I assume) Take the bigger box (40'8"x 37') and subtract the two smaller boxes (23'5" x 6'4" and 7'6" x 13'7")

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It's Not Flat, stop trying new math on the problem

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Originally Posted by davsel

42

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Common Core math.

http://www.kappit.com/img/pics/201509_1635_afece_sm.jpg

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Originally Posted by Great-Kazoo

It's Not Flat, stop trying new math on the problem

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Don't worry Kazoo, I'm a rocket scientist. [LOL]

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Originally Posted by Great-Kazoo

$4700 in roofing materials + labor . That doesn't include decking. Don't forget gutters & down spouts. Which will get trashed by the tear off crew. Throwing another $4200 in materials.

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Knowing the rough size of the roof, this isn't actually that far off.

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Originally Posted by HoneyBadger

Exactly. Because it has slope, there is a third measurable dimension that the above "two rectangles" don't account for. Need to know the pitch(es) of the roof if you are looking for a surface area measurement.



Are you saying you measured from eve to ridge here? If so, and the pitch is consistent through out, then the rectangles method will work fine.

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You have to find the area of each shape individually because of the slope. The measurements are actual, just drawn on an image that is "in scale" so it looks the same as if you were viewing the roof from a bird's eye view. I didn't measure eave to ridge, except for along the hips and valleys (which isn't helpful). A friend suggested that Wolframalpha can do this for me, and I may start using that program to save time.

So how far off was my 1001sqft guestimate?

Well, I'd say over 900 sq/ft off, but I'm not sure I'm comfortable with the way I came to my answer. I'm going to see what wolframalpha says.

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Originally Posted by Irving

Well, I'd say over 900 sq/ft off, but I'm not sure I'm comfortable with the way I came to my answer. I'm going to see what wolframalpha says.

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Uhhhhh wtf is the roof pitch?

I'm laying in bed with my iPad after a few glasses of scotch. Math is a bit harder, but inventing things is easier... Got any niche problems that need solving?

So what was the roof pitch? Was it consistent throughout? That will make things easier.

The triangles you measured out are simple trig, but the other shapes are a bit tougher...