Open End Pole Barn Truss Orientation

[jeepcj7]

I am building a 30' x 30' x 10' pole barn with 1 end fully open (10' 30 opening). The roof trusses are gable shaped. The open side of the building will be facing straight East. The prevailing wind blows from the West, Southwest or South. Will use metal sheeting for the roof and sides.

I am trying to decide on the pros and cons of installing the trusses so the peak runs East and West vs North and South.

It seems like it would be cheaper to run the trusses so the peak runs East and West because I will not have to have a header over the opening. Since the opening is under a truss, it would not require an any kind of center pole either... but I could be all wet in my thinking.

Any thoughts are appreciated.

 

[747driver]

Sounds logical. Maybe a double truss for the open end to give it more strength. Your planning on the prevailing winds is good. You want to make sure that the wind will not get under the roof to often on that open end. I take it your putting metal siding on the open end truss ? You could put 45 degree corner braces up on each end wall maybe 4 foot down from the where the eave and truss attach.

 

[LouNY]

From the sounds of the east to west you would not have an eve dumping on your open side, that would be a big plus in my mind.

 

[Rustyiron]

It seems like it would be cheaper to run the trusses so the peak runs East and West because I will not have to have a header over the opening. Since the opening is under a truss, it would not require an any kind of center pole either... but I could be all wet in my thinking.

Any thoughts are appreciated.

You are correct in your thinking. The only consideration I'd have (for the prevailing wind) is your 30' opening, not the roof orientation.
(put the gable end above your open wall):thumbsup:

 

[bcp]

Truss Orientation?

Peaks go on top.



Bruce

 

[Oldoak]

Truss Orientation?

Peaks go on top.



Bruce

So that's why my roof is flat even though I specified trusses with a 5/12 pitch. And I keep hitting my head every time I walk into my pole building. :confused3:

 

[aczlan]

From the sounds of the east to west you would not have an eve dumping on your open side, that would be a big plus in my mind.

That is how we did our 30 x 40 pole barn. The peak runs parallel to the 30-foot side and the 40 foot side has doors on it so that the snow dumps on the 30-foot side instead of in front of the doors

Aaron Z

 

[chim]

If a Truss applies for a job, it's probably illegal to ask.

 

[EddieWalker]

I am building a 30' x 30' x 10' pole barn with 1 end fully open (10' 30 opening). The roof trusses are gable shaped. The open side of the building will be facing straight East. The prevailing wind blows from the West, Southwest or South. Will use metal sheeting for the roof and sides.

I am trying to decide on the pros and cons of installing the trusses so the peak runs East and West vs North and South.

It seems like it would be cheaper to run the trusses so the peak runs East and West because I will not have to have a header over the opening. Since the opening is under a truss, it would not require an any kind of center pole either... but I could be all wet in my thinking.

Any thoughts are appreciated.

It really wont matter. What is more important is how you attach your trusses to your walls. Wind damage to roofs is from the roof lifting off of the wall. In some states, you are required to have one solid piece of metal tied into the foundation, attached to the wall studs and then over the top of the trusses or rafters.

The other consideration is going to be on the pressure applied to that end truss over the opening. In most buildings, there is a header to hold everything together. It doesn't only carry the load above it, but it also keeps the wall straight and secured. Your end truss is going to want to bend in from the wind going over it, and then back into your building. I've never dealt with a 30 foot opening, and my guess is that very few people have. This might be a good time to consult an engineer.

 

[Dave M7040]

Regardless of the orientation you decide on, consider building the roof structure on the ground.

I see safety regulations on construction sites drive more and bigger entire roof assemblies to be built on the ground and then hoisted in one lift into place and secured.

I can envision the poles being attached to the roof assembly using a hinge so the poles are lying horizontally and then when lifted the poles are hanging from the assembled roof. Now you guide each pole into its hole and secure at top and bottom.

Dave M7040