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-   -   rise for a 4:12 pitch roof (https://www.contractortalk.com/f14/rise-4-12-pitch-roof-80827/)

topdog 07-05-2010 09:54 AM

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

[email protected] 07-05-2010 10:22 AM

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

bwalley 07-05-2010 10:40 AM

Quote:

Originally Posted by [email protected] (Post 964565)
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.

AustinDB 07-05-2010 10:55 AM

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.

Gus Dering 07-05-2010 03:02 PM

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.

Framer53 07-05-2010 04:29 PM

Quote:

Originally Posted by topdog (Post 964556)
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?

CanningCustom 07-05-2010 05:39 PM

um you are forgetting about the undetermined heal height so with out that missing variable the true height can not be found.

Framer53 07-05-2010 05:51 PM

Quote:

Originally Posted by CanningCustom (Post 964779)
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.

AustinDB 07-05-2010 06:08 PM

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 :blink:

loneframer 07-05-2010 06:22 PM

Quote:

Originally Posted by 72chevy4x4 (Post 964815)
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 :blink:

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.:furious: I won't ever set another truss in a home with height restrictions without checking them first.:whistling

mudpad 07-05-2010 07:38 PM

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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