I’ll find out tomorrow, but will a truss maker engineer a package for a 4,000 sf roof footprint when the owner wants 42″ truss spacings, 2×4 purlins, no sheathing, and the roofing will be steel panels?
Ground snow loading is 90 psf.
I’ll find out tomorrow, but will a truss maker engineer a package for a 4,000 sf roof footprint when the owner wants 42″ truss spacings, 2×4 purlins, no sheathing, and the roofing will be steel panels?
Ground snow loading is 90 psf.
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Replies
its going to fall in
A professionally engineered truss roof can be achieved in the manner you describe, however the greater the truss spacing, the stronger the truss needs to be. I have seen home-made trusses @ 8ft. spacing w/2x6 purlins standing 20 years later. Trust the engineer,let him/her do his/her thing.
Yes Gene, very easilly.
I live down in utica, how is your weather?
Shouldn't be a problem.
I have done a lot of buildings with 50" spans, Trusses 8' O.C. and 2 x 6 purloins.
Trusses are "Ganged" or multi ply when doing this in my experience.
Lack of sheathing may create problems with the lack of a roof diaphragm to counter wind loads however. Make sure that the entire roof assembly gets checked by an engineer, not just the trusses alone.
Steel roofing may make up for lack of a diaphragm I don't know . If not strapping or bracing can be added to the framing.
Piece of cake.
Why would you think it would NOT work?
I think he is worried about snow load. Though not real sure.
I don't see the snow load as a problem. The purlins could be a higher grade of lumber or they could use closer spacing to make them work. The trusses could use larger chord sizes or be made 2 ply if it's a longer span.
When two egotists meet, it's an I for an I.
I know we have done that!
What is your ground snow load?
I'm in KY and where I live it is 20 lbs./sq.ft.
My shop is trussed at 48" o.c. and purlins are 2x4 at 2' o.c. let in between the trusses. Trusses are 30' span with 2x6 top and bottom cords.
My guess would be changing the purlins to 2x6s would have added to my snow load capacity without changing the trusses. I think they were over figured because the manufacturer got flustered when I caught him designing for the GSL next to the one where I lve. It is 15 lbs/sq. ft. there, and he didn't know there was a higher loading zone in the whole state. However he is one of the very few to every send me a spec. sheet on the trusses before they were delivered.