Lean to slope

[rinconnick]

I am building a 30x40 pole barn with a 4/12 pitch roof. To get the clearance I want in the lean to's I am going to be at like a 1.5/12 pitch is the ok or a little low?

 

[rinconnick]

Should have went taller with the building but contractor had post concreted before I could change it.

 

[Moosefire]

How big is the lean-to? If it's only a few feet wide it's no big deal I think, but if it's a significant distance then it might have load bearing issues if theres snow load...

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[u2slow]

I have something like that on my house's car-port. Its certainly not ideal.

How wide is the lean-to? If you go with metal the full width there's no seams to draw water back underneath. The transition is still vulnerable though.

 

[rinconnick]

Its a 14 foot lean to. I plan to use 2x10 for the rafters. It will be a metal roof.

 

[readhead]

Land the rafters further up the main pitch rather than at the eave if possible.

 

[u2slow]

14' lengths of tin shouldn't be a problem. You'll want to membrane the 4/12 roof up to past the level of snow accumulations on the lean-to.

 

[Bretny]

Check with the manufacture of metal roof pannels. I do beleve there is one that says there profile is good down to 1.5/12 pitch. Its not a normal R rib pannel. Those are good to 3/12 pitch.

 

[Lynden]

What will be the height of the lean-to's outside wall? Can you reduce the height to increase the roof pitch? The outside wall on my lean-to is 6.5' high and I don't have any problems walking around inside.

 

[larry4406]

We ice and water guard 100% anything 3/12 or less.

Our shallowest pitch roofs are 3/12. Asphalt shingles.

New home construction guy..

 

[rinconnick]

I need 11 feet on the outside to park my camper underneath it.


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[rinconnick]

My height at the eave is 12’6”. The truss is another 6-7 inches above that


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[ard]

I need 11 feet on the outside to park my camper underneath it.

Dig?

 

[Bretny]

http://www.unioncorrugating.com/rpanel.html

PBR pannel is the name. Good down to 1:12 pitch. The spec is all the way at the bottom.

 

[blackdak8]

I have a 32X50 at 4/12 with a 17x50 lean-to at 1.5/12 with metal roof. Rafters are 2x8 at 24" centers. It's been up for about 5 years with no problems. In central KY.

 

[kwb]

Dig?

I was going to say the same thing - take about a foot of grade out and you will make a big improvement in slope. Cut the eves off, put the rim joist a few inches high, balloon in the pitch to the existing roof and you will be money.

Scraping off a foot and blending back into the surrounding area is pretty easy as long as the approach isn't paved yet.

 

[Lynden]

Land the rafters further up the main pitch rather than at the eave if possible.

Have you considered this ^^ idea? If you extended the roof of the addition to the ridge of the pole barn, what would the pitch be?

http://4.bp.blogspot.com/-t1JhLcbZx5Y/U_CymYuM95I/AAAAAAAAAPU/a6D7g_rQ5A8/s1600/t1760-rv1.jpg