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Rise For A 4:12 Pitch Roof

 
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Old 07-05-2010, 09:54 AM   #1
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Rise For A 4:12 Pitch Roof


I am building a portch roof and it has been a long time . can someone tell me what the rise from the bottom cord to the peek it on a 4:12 pich the span is 23 foot acrost the botttom cord . thanks
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Old 07-05-2010, 10:22 AM   #2
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Re: Rise For A 4:12 Pitch Roof


4" per foot. uh lets see... 23' divided by 2= 11.5'. 11.5' X 4 would be 46"

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Last edited by [email protected]; 07-05-2010 at 10:27 AM.
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Old 07-05-2010, 10:40 AM   #3
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Re: Rise For A 4:12 Pitch Roof


Quote:
Originally Posted by [email protected] View Post
4" per foot. uh lets see... 23' divided by 2= 11.5'. 11.5' X 4 would be 46"
It depends on what type of porch roof, if it is a shed type roof, it will have 92" of rise.
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Old 07-05-2010, 10:55 AM   #4
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Re: Rise For A 4:12 Pitch Roof


set it up as a ratio proportion...

4 / 12 = x / 23 (cross multiply and divide...)

(4*23) / 12 = 7.6666 = 7' 8"

it's up to you to figure out where to measure up from based on your construction methods.
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Old 07-05-2010, 03:02 PM   #5
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Re: Rise For A 4:12 Pitch Roof


From the "bottom cord" to the "peak"?

If that means from the plate line to the top of ridge you will have to add the vertical distance of the truss at the plate line to the rise.
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Old 07-05-2010, 04:29 PM   #6
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Re: Rise For A 4:12 Pitch Roof


Quote:
Originally Posted by topdog View Post
I am building a portch roof and it has been a long time . can someone tell me what the rise from the bottom cord to the peek it on a 4:12 pich the span is 23 foot acrost the botttom cord . thanks

Not for nothing but why is it important at this point?
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Old 07-05-2010, 05:39 PM   #7
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Re: Rise For A 4:12 Pitch Roof


um you are forgetting about the undetermined heal height so with out that missing variable the true height can not be found.
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Old 07-05-2010, 05:51 PM   #8
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Re: Rise For A 4:12 Pitch Roof


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um you are forgetting about the undetermined heal height so with out that missing variable the true height can not be found.
I guess I still don't understand why the question.. He already has the trusses, unless I misunderstand.
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Old 07-05-2010, 06:08 PM   #9
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Re: Rise For A 4:12 Pitch Roof


good point w/ the 'chord' terminology and description...does a truss certification sheet have total height from the plate? I 'assumed' he was building this out of stick...hence Canning's response. May be the OP is stick building the roof and unfamiliar with the terms, or mabye not
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Old 07-05-2010, 06:22 PM   #10
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Re: Rise For A 4:12 Pitch Roof


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Originally Posted by 72chevy4x4 View Post
good point w/ the 'chord' terminology and description...does a truss certification sheet have total height from the plate? I 'assumed' he was building this out of stick...hence Canning's response. May be the OP is stick building the roof and unfamiliar with the terms, or mabye not
I did a beachfront home that had trusses through one section. The shop drawings had all the dimensions on them. The only problem was, they were 6" taller than the shop drawings. Had to lower the entire section 6" by cutting the wall studs, after the trusses were set and the walls were sheathed. I won't ever set another truss in a home with height restrictions without checking them first.
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Old 07-05-2010, 07:38 PM   #11
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Re: Rise For A 4:12 Pitch Roof


I am dealing with overhang issues at the gables on my metal truss project. The shops say they work, but reality is they don't. Truss manufacturer is picking up the cost of the fix, but what a pain in the ass.

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