I'm starting a new hay shed which is to be 30' X 40' and have planned to use 4X4 steel columns supporting 30' manufactured steel trusses which support 4" purlins and then steel roofing. The columns and truss spacing were to be 13.3' for good frontal access, but I am now beginning to wonder whether or not the 4" purlins can take that 13 foot spacing. Any opinions?
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hay shed roofing
- Thread starter regarcia
- Start date
John in OH
Well-known member
You've got to provide more info ....
Where are you located? Are hurricane winds and issue? What snow load is normal for your area? What purlin spacing will you be using? When you say "4" do you mean 2x4s as purlins? Are you placing the 2x4 purlins flat or on edge? What gauge steel roofing will you be using?
As a general "shoot from the hip" answer, I think 13 ft. is too great a span. I wouldn't go more than 8 ft. for 2x4 purlins on 2 ft centers ... but you need to provide more info.
Where are you located? Are hurricane winds and issue? What snow load is normal for your area? What purlin spacing will you be using? When you say "4" do you mean 2x4s as purlins? Are you placing the 2x4 purlins flat or on edge? What gauge steel roofing will you be using?
As a general "shoot from the hip" answer, I think 13 ft. is too great a span. I wouldn't go more than 8 ft. for 2x4 purlins on 2 ft centers ... but you need to provide more info.
ibedayank
Well-known member
I have a polebarn 12 foot spans 2x6 spaced 24 inches apart on the roof on edge
walls 2x6 4foot spacing flat mounted to posts tin screwed in with 1 1/4 inch polebarn screws
snowload...couple inches but never stays more than a few days
wind... tornado alley so if i get hit...gonna bend over and kiss my ... goodbye
walls 2x6 4foot spacing flat mounted to posts tin screwed in with 1 1/4 inch polebarn screws
snowload...couple inches but never stays more than a few days
wind... tornado alley so if i get hit...gonna bend over and kiss my ... goodbye
BWS
Well-known member
One advantage to "buying" trusses,is the usually....VG engineering that co. can provide on exactly what you're asking.Further....if that truss co is a homey(local to you),they'll be on top of all applicable "special" requirements.
Most folks never take the opportunity to consult with their engineers....they call around getting prices.Not giving a second thought about the why's and how's of this engineering resource,choosing the cheapest price.And in the process,are potentially "leaving alot on the table"....WRT little changes in design that may actually SAVE you money and even increase storage.just sayin,BW
Most folks never take the opportunity to consult with their engineers....they call around getting prices.Not giving a second thought about the why's and how's of this engineering resource,choosing the cheapest price.And in the process,are potentially "leaving alot on the table"....WRT little changes in design that may actually SAVE you money and even increase storage.just sayin,BW
Sorry for the lack of information. I'm located in northern New Mexico. Small wind loads, but snow can get to 24". The pulins are 2X4 steel on edge welded to the trusses. I had planed on 3' centers per the steel company I bought the material from. They stated that the purlins on edge could go up to 15'. I have questioned this advice since they're business is selling metal. I have not yet picked out a thickness for the metal roofing. By the way there are fewer county restrictions in this area.