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Posted by Raider Bill on February 16, 2008, 8:31 am
>
> > House is 40x48 and will have simple gabled roof 4-12 pitch. How do I
> > figure out my roof sq ft? Figure adding on a 2' overhang.
>
> The plan area of the roof is 44 x 52 due to the 2' overhangs. =A0The
> hypoteneuse of a 4-12 triangle is sqrt(4*4 + 12*12) =3D 12.649. =A0So the
> roof area is (12.649/12) times as big as the plan area. =A0This makes
> (12.649/12) * 44 * 52 =3D 2412 square feet.
>
> However, if you are ordering 4' x 8' plywood, then you want to know a
> little bit more. =A0Assuming the ridge runs the 52' direction, each side
> of the roof is 52' by 22 * (12.649/12) =3D 52' by 23.19'. =A0So you'll
> need 6 rows of plywood on each side (23.19 / 4, rounded up). =A0Each row
> will require 6.5 sheets (52/8, rounded up to nearest half). =A0So you'll
> need 2 * 6 * 6.5 =3D 78 sheets.
>
> Cheers, Wayne
Thats guys. I slept through my math classes in school. Now I pay the
price.
Ridge line will run the 40 feet
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