Roof Vignette - why the higher room elevation is 19'

Ramp, Stair, & Roof Vignettes and Multiple Choice

Roof Vignette - why the higher room elevation is 19'

Postby jijiniuniu » Wed Jun 27, 2018 12:20 am

the intersection point of the lower roof is 14', + 1'6" roof deck thickness + 2' window height , the lower roof point of the higher roof should be 17'6", why the NCARB passing solution shows 19'

please advise.

Thanks
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Re: Roof Vignette - why the higher room elevation is 19'

Postby Coach » Wed Jun 27, 2018 1:28 am

Look at the whole picture rather than concentrating on one number and you'll figure it out.
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Re: Roof Vignette - why the higher room elevation is 19'

Postby jijiniuniu » Wed Jun 27, 2018 11:40 am

Thank you Coach.

yes , I figure it out. The distance of the two ends to the ridge is different. starting from the east edge from 10', then we will get the 19' at the west edge.

But my question is do we need to add 6" ? If the lowest point of higher roof is 9'6" , then the west edge could be 18-6".

additionally, why NCARB passign solution use 3:12 slope instead of 2:12 ? any reason ?

Please advise. Thanks
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Re: Roof Vignette - why the higher room elevation is 19'

Postby Coach » Wed Jun 27, 2018 12:44 pm

jijiniuniu wrote:But my question is do we need to add 6" ? If the lowest point of higher roof is 9'6" , then the west edge could be 18-6".

The upper roof must be higher than lower at all points where they meet.

additionally, why NCARB passign solution use 3:12 slope instead of 2:12 ? any reason ?

No reason.
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Re: Roof Vignette - why the higher room elevation is 19'

Postby jijiniuniu » Wed Jun 27, 2018 1:12 pm

I see, thank you Coach.
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