30x50x16 pole barn construction

[ovrszd]

Its the same concept just different materials. You have to be sure the trusses are constructed correctly. Thats the key factor...these trusses are over built, which allows using a 2x4 purlin.

The potential sag that concerns me isn't rafter sag.

A test might be to walk on the roof after it's tinned. Can you tell where the rafters are?

 

[GSVette]

On my 40x60x14 pole barn-designed for a 65#/ft gsl and with bottom loaded trusses on 12’ centers required 2x6 select structural purlins on 24” centers to meet code deflection criteria.

At low snow loads I could see the use of 2x4 purlins-As a structural engineer I personally would have spec’d 2x6 but if the engineering allows 2x4 and they meet the code deflection criteria then they are good enough

 

[Hiltz]

After much thought and reflection Ive come up with the following conclusion. I think I would trust certified engineers and building code enforcement officials on my construction project rather than anonymous internet posters.

 

[ovrszd]

After much thought and reflection Ive come up with the following conclusion. I think I would trust certified engineers and building code enforcement officials on my construction project rather than anonymous internet posters.

Especially if those engineers are covering the warranty!!!

 

[Fuddy1952]

It looks fantastic and will give years of enjoyment. My only suggestion was to do whatever you think you may do now before moving in!

 

[two_bit_score]

After much thought and reflection Ive come up with the following conclusion. I think I would trust certified engineers and building code enforcement officials on my construction project rather than anonymous internet posters.

Really!? Now why???

 

[Hiltz]

Really!? Now why???

Call me crazy

 

[/pine]

On my 40x60x14 pole barn-designed for a 65#/ft gsl and with bottom loaded trusses on 12 centers required 2x6 select structural purlins on 24 centers to meet code deflection criteria.

At low snow loads I could see the use of 2x4 purlins-As a structural engineer I personally would have spec壇 2x6 but if the engineering allows 2x4 and they meet the code deflection criteria then they are good enough

The only thing I question is if the live load (wind, snow, ice etc.) factor used in the design was interpolated to reflect contemporary weather extremes ?
I have not searched so I don't know if the design factor charts for things like storm water runoff (rainfall) and snow/ice loads have been updated in the last couple of decades??

 

[buckeyefarmer]

After much thought and reflection Ive come up with the following conclusion. I think I would trust certified engineers and building code enforcement officials on my construction project rather than anonymous internet posters.

Yea, because no one else is capable of reading a span table....

 

[buckeyefarmer]

Using E=1,200,000,000 and deflection of 1/240. A 2x4, 12" oc as a rafter can span 11'3" and still support 10# sf live weight.