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Old 12-02-2009, 07:37 PM   #1
cheif outhouse engineer
 
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16' lean on a 36 X 45 pole barn


I am adding a lean on the side of my pole barn. I am considering building my own truss' as I have three teen age boys who could use something to do this Christmas break and we could all learn a little something along the way.

I need info on what size lumber to build the truss' out of and where to place the bracing, etc. I would just use plywood and glue like they used to before metal gussets became the rage.

I also need to determine the appropriate size of my top supporting board. Not sure of the right term, but the 2 X that the truss' would set on.

I have a decent handle on the pitch and dimensions, but I have no framing experience to tell me where to find the necessary live load calculations etc.

Do I need an engineer or can I over build without wasting too much on additional lumber.

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Old 12-02-2009, 09:37 PM   #2
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16' lean on a 36 X 45 pole barn


Menards will make them for you cheaper than you can make them your self!

If you want to make them--go to Menards and ask them to show you what they would do-
----Copy that!--MIKE--

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Old 12-02-2009, 10:32 PM   #3
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16' lean on a 36 X 45 pole barn


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Originally Posted by oh'mike View Post
Menards will make them for you cheaper than you can make them your self!

There is some value of doing it ourselves but if the materials are more than the truss, then I guess we will just have to learn something else. I'm an hour from Menards, Lowes, Home Cheapo or whatever.

I'm calling a local truss company to get their prices and go from there. Looking for something online, but haven't found what I need yet.
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Old 12-02-2009, 10:59 PM   #4
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16' lean on a 36 X 45 pole barn


My lean to is only 12' X 35'. I used a 2X6 for the ledger board and 2 X 12 for the rafters and 3 2X12 for ties Plus the closed ends.
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Old 12-02-2009, 11:33 PM   #5
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16' lean on a 36 X 45 pole barn


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Originally Posted by hayewe farm View Post
My lean to is only 12' X 35'. I used a 2X6 for the ledger board and 2 X 12 for the rafters and 3 2X12 for ties Plus the closed ends.
How did you determine the 2 X 6 was sufficient to carry the load.

Looking for a table or something. I have found several span tables, but they are for rafters on 2 foot centers. I'm thinking about a truss, maybe I can go to 4 foot centers, but how do I know for sure.
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Old 12-03-2009, 12:04 AM   #6
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16' lean on a 36 X 45 pole barn


Mine is on a post and beam barn so the ledger is nailed into a horizontal beam. In a pole barn you can nail into the posts and add additional support to the ledger by screwing through the metal sheeting into the ledger. Most of the weight is on the lower wall. I went every 24" and used 2X4s flat for perlins If you go 48" you will want to use 2X4s on edge for perlins. You can see the lean to on the side of the bar picture below. Mine is closed in.
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Old 12-03-2009, 07:24 AM   #7
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16' lean on a 36 X 45 pole barn


So you S.W.A.G.'ed the strength requirements. What works for you, no problem.

Since my span is 16 feet and and I hope to insulate and heat this area for a workshop I am a little more concerned that it doesn't collapse under a heavy load.

Thanks for your input, I built the first barn so I am aware of polebarn construction.
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Old 12-03-2009, 08:30 AM   #8
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16' lean on a 36 X 45 pole barn


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Do I need an engineer..........?
Yes! And the engineer will need to see the site to determine width, slope, anchorage, support, species of wood, grade of lumber, etc.


A licensed P.E. for 26 years
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Old 12-03-2009, 10:24 AM   #9
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16' lean on a 36 X 45 pole barn


You don't need an engineer if your building department will allow you to use the rafter span table in the IRC and you don't mind stick framing. Call the building department and see if that's ok.
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Old 12-03-2009, 01:59 PM   #10
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16' lean on a 36 X 45 pole barn


Not exactly a swag. I went to the lumber yard and ask what size I needed for 12' clear spam rafters. They had a chart. The ledger board was no problem because it could be nailed or lagged ever 16". A little harder to do on a pole barn. It has withstood 6" of snow accumulation and 70 mph winds.
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Old 12-03-2009, 03:06 PM   #11
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16' lean on a 36 X 45 pole barn


I agree with MI-Roger, get an engineer. He/she will tell you point loads, bearings, footing size, and header size so the soffit line doesn't sag. Make sure your insurance company knows you got a permit for it, otherwise it's a big liability if anything ever happened.

Be safe, Gary

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Last edited by Gary in WA; 12-03-2009 at 03:08 PM.
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