Framing Walls Inside a Pole Barn: The Posts Won't Be Straight

You can frame an ordinary stud wall inside a pole barn, and it's the usual way to turn one corner of a big open building into a workshop you can heat or cool. The catch is the posts. By the time you get around to framing, they've probably moved, and a wall built to follow them won't be plumb.

The video below is a family on their farm framing the workshop inside a pole barn that had been standing, open, for almost a year. It's a rainy-day job, the kids are carrying boards, and the useful part is what the owner says at the end.

What they're building, and what they're not

The plan is modest on purpose. Frame and enclose a workshop. Close in three sides of the barn. Leave the front bays open so equipment can pull in out of the weather. His stated goal is getting tools that have lived in totes and under the porch for years into one place.

That's a sensible order for a lot of owners. The shell is the expensive, hard-to-DIY part, and it's often done by a crew. The interior walls are the part a handy owner can do in evenings, a wall at a time, which is exactly how he describes the rest of his week.

It's also a reminder that "a pole barn" isn't one price. A shell with open bays and a shell with a framed, insulated room inside it are different projects, and the building can be the smaller part of the total. In the itemized 40x60, it was less than half the bill.

The posts moved

Posts that have stood for a year will not be where they were set. Frame the wall to plumb, not to the post.

This is the one lesson in the video worth the whole watch. Nearly a year after the posts went in, he says, some had twisted and some had bowed "like a banana." On one wall the new framing touches the post at the bottom and sits an inch and a half off it at the top. His own verdict: "which is not good, but I can fix it."

He's right on both counts. It isn't good, and it's fixable. The sidewall and siding will cover the gap, and nobody will see it once it's closed in. What you don't want is to shim the wall toward a bowed post and end up with a wall that leans.

Two things follow from that:

1. Measure every bay before you cut. Top and bottom, both posts. A bay that measures right at the slab can be off at the top plate.
2. Dry fit before you fasten. He stands the hardest wall up once just to check it works before committing. That's cheap insurance on a wall you can barely lift.

If you're still choosing posts, this is the real-world version of the warning in our framing walkthrough: a builder there explains why solid posts can twist as the grain moves, and why laminated posts are his default. This video doesn't say which kind these were. It does show what movement looks like when you try to build against it.

Build the wall for the room it will become

He framed the front wall in 2x6, not 2x4, and gives the reason on camera. It's the east-facing wall, it takes a lot of sun, and he wants to put air conditioning in the workshop eventually. A deeper stud cavity holds more insulation.

That's the right way to decide wall depth: by what the room will be used for, not by what's left in the lumber pile. A wall that will never see a heater or an AC unit doesn't need the extra depth. The wall between a conditioned shop and the sun does.

He also admits the 2x6 walls were a lot of work. They are. A long 2x6 wall with a header in it is heavy enough that the video has several people on it and repeated warnings to stay out from under it while it goes up. Plan the lift before you build the wall flat on the slab, and have the hands there when you do.

Openings, headers, and the slab

A few details worth copying:

• Build to the door jacks first. He framed the walls over to where the door jacks go (four of them for the bay door header to sit on) and left the header work for last. He calls that the hardest wall, and it is. Everything else lines up to it.
• Pick the doors before you frame. The workshop gets an 8x8 main door. He's planning a small window, around 3x3, set high on the wall. Rough openings are far easier to frame in than to cut in later.
• Set first, anchor later. The bottom plates get tapped into place with a sledge and fastened with Tapcons afterward. If one wall needs to move an inch, you're not backing screws out of concrete.

The joint between that bottom plate and the slab is where water finds its way in. One owner put a sealed bottom plate on his list of things he wishes he'd asked for up front, in what to know before building a pole barn.

What this costs

The video doesn't give a number, and we won't invent one. What drives the cost of framing a room inside an existing pole barn is easy to name, though: how many linear feet of wall, 2x4 or 2x6, how many door and window openings, and whether you're insulating and conditioning the room or just enclosing it. Doing the labor yourself, as this family does, takes the labor line off the bill entirely. The concrete underneath is already paid for, which is why the slab is worth getting right the first time, as one owner found building his shop twice.

If you'd rather have the interior framed by the same crew that builds the shell, ask for it as its own line on the bid.

Find a builder who'll frame the inside too

Check the posts. Frame to plumb. Build the wall for the room it's going to be.