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Roof Plane Sheathing Area?

 
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Old Yesterday, 09:05 PM   #1
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Roof Plane Sheathing Area?


New to the forum. Any assistance and/or education provided would be highly appreciated. Thank you in advance for your responses!

I was recently asked to bid on the installation of pre-engineered roof trusses and sheathing for a 2-story home. The homeowner had provided me with both the architectural renderings and preliminary layout from the material supplier. The total square feet (40' x 40') based upon the architectural rendering is 1600 +/- square feet, but the layout provided by the material supplier calculated the roof plane sheathing area square feet of the roof to be 2500 +/- square feet. The square footage does not include sheathing of other areas such as fascia, gable, etc...

I am unable to figure out, where the difference in square footage is coming from? Am I missing something?
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Old Yesterday, 09:13 PM   #2
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Re: Roof Plane Sheathing Area?


the roof planes rise from the wall plate to the ridge.

that length is greater than the straight horizontal run from the plate to a center line.

add in the overhangs and there you are...

if you do not realize this YOU ARE IN WAY OVER YOUR HEAD...

my bet is you are a home owner/diyer trying to figger this chit out...

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Old Yesterday, 09:14 PM   #3
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Re: Roof Plane Sheathing Area?


Are there overhangs? Is the roof sloped?
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Old Yesterday, 09:22 PM   #4
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Re: Roof Plane Sheathing Area?


I've only been accustomed to doing small interior framing additions and have never done any structural roofing related jobs before I'm still learning and do not claim to know everything by any means. Again, still learning is all. Thank you for the prompt responses. Didn't even consider the pitch, slope, overhang, or other. Makes perfect sense now.
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Old Yesterday, 09:51 PM   #5
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Re: Roof Plane Sheathing Area?


Holy crikey ! I think anyone who’s watched one house flipping show on DITV would’ve understood what’s going on.
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Old Yesterday, 10:30 PM   #6
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Re: Roof Plane Sheathing Area?


Quote:
Originally Posted by beerpockets View Post
I've only been accustomed to doing small interior framing additions and have never done any structural roofing related jobs before I'm still learning and do not claim to know everything by any means. Again, still learning is all. Thank you for the prompt responses. Didn't even consider the pitch, slope, overhang, or other. Makes perfect sense now.
Prob'ly maybe a good time to pass on this one.



Or stop carrying beer in your pockets, and focus on learning your trade.
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Old Yesterday, 11:08 PM   #7
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Re: Roof Plane Sheathing Area?


Quote:
Originally Posted by beerpockets View Post
I've only been accustomed to doing small interior framing additions and have never done any structural roofing related jobs before I'm still learning and do not claim to know everything by any means. Again, still learning is all. Thank you for the prompt responses. Didn't even consider the pitch, slope, overhang, or other. Makes perfect sense now.
You might want to work with a good roof framer on a dozen or so homes before you jump into this one..
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Old Today, 05:38 AM   #8
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Re: Roof Plane Sheathing Area?


You have to use pitch multiplier, there is one for every roof pitch, you can use a multiplier chart for a common roof pitch.... that will give you an exact roof plane area in SF /100 that will give you material count. Use the same multiplier to get your gable lengths.

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