Thoughts on roof pitch?i

[Jimmies63]

I'm putting up a 44x80 pole barn. Height restriction is 18'.

Roof pitch at that size with 12' walls is 2.9:12. That will be a pretty low slope, though engineer stamped, for our region.

I don't plan to have attic storage. Any thoughts on roof pitch +/-'s?

The alternate is to go 4:12 or 5:12 and apply for a code variance.

 

[FlyingLow]

Around here 3:12 would need torch on, not sure about metal as an option. I wouldn't want less than 5:12 with asphalt shingles. Depending on roofing costs it may be best to apply to the varriance for 5:12 so you can save a bit of money on roofing.

 

[Jimmies63]

Right now it is spec'ed and priced for steel roof.

 

[Wingnut65]

Check to see what the measurement is for the height restriction. Many jurisdictions allow it to be the Mean Roof Height, which is half way up the slope. If that would be acceptable, then your roof could possibly go up to 24' at the peak.

For a metal roof, 2.9:12 will work.

 

[noslin]

you can put comp on at that pitch using double felt. if you do comp at that pitch put on a self adhered underlayment (snow and ice) and you will be fine. put that on the entire roof. hten put a 15lb over it for a good solid underlayment. the self adhered will help in ice dam situations if that happends in your area. manufactures set 4:12 as the cutoff between double felt and single layer felt.

if you do a torch you should strap the roof as if you do it the conventional way it will eventually slide right off the roof. only a few manufactures will have a system that you can put on a 2:12 that is warrantable; certainteed is one. but they wont supply any warranties for a residential applications.

for metal, you can go down to 1/2:12 depending on the panel you use, some 1/4:12. if you have straight runs and no vallley a PBR or R type panel can be used. thats what is used on most steel buildings anyways.

dean

 

[Jimmies63]

sounds like a 3:12 metal roof pitch is not a bad idea. I might just stick with that forgo the variance application.

thanks for the replies.

 

[DekeT]

If your pole barn is strictly for agricultural use, zoning ordinances usually takes a back seat on the rules.

If this is just an accessory building for whatnots, why do you need 12 foot sidewalls? Why do you need 44 feet across instead of 40 feet. Why not build longer than 80 feet to make up the difference. Does the size of your planned accessory building exceed what is allowable for your zoning? A variance is usually not granted for circumstances you create and could have avoided.

 

[SARG]

I would go 5/12 just because they look better ....and they function better as well.

 

[ddawg16]

Where are you located?

Like the others...I would prefer a bit more pitch. If you get snow....you want more pitch....

Why do you need 12' walls? Keep the tall stuff in the middle.....storage shelves 12' up are hard to reach

 

[jdieter]

like others stated if you're in a snow area or a heavy leaf drop in the fall, the steeper the pitch the better