Anyone ever built a pole barn DIY (approx. 36x16 total, 16x24 enclosed)?

No, not extacly.

But I have built a pavilion that size with a metal roof.

I can tell you one thing for sure, you are gonna need help. Probably two friends or relatives I would guess.

Just the parts touching the ground needs to be treated. Spray paint everything else.

Sawmill shack.

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Just the parts touching the ground needs to be treated

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I wouldnt let the treated post touch the ground. Pour some concrete and the use a base anchor like this. They have several different types. But you wanna keep the wood off the ground. Even treated stuff will rot and invite termites if it's on or in the groind.



As far as using untreated or treated I would probably go ahead and use treated since it is going to be an open shed with no interior walls to cover the frame. But it would probably be fine either way. Definitely use treated for anything exposed to the weather though, and stain it with a sealer. You could paint it too, but that thomspson's or Olympic spray on stain and sealer is so much easier to do.

Eta: Also, as far as your 4x4 post go you are gonna be hard pressed to find them untreated anyway. Your ceiling joist and rafters could be untreated though.

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You could paint it too, but that thomspson's or Olympic spray on stain and sealer is so much easier to do.

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The bumblebees can be ruthless on wood not painted

Oh, and another note. Whether you paint or stain, wait about 4 months to do it and let the wood dry out.