I'm in CT and sounds like I have similar stalls to yours. Metal channels where 2x12s slide into the channels length wise horizontally.
I put in white pine. Seems to work well, it does warp a tiny bit but not enough to really notice or stress the channels. It's a smooth pine, not rough. Relatively inexpensive. Simple to pop out between stalls as long as you don't put the grills on top. But it does warp like hell if you hang floor mats from them on a stall kicker's walls. I wouldn't recommend that. (don't ask how I know that, LOL)
It also takes a decent amount of abuse if two stalled next to each other decide to kick a bit or run their teeth up and down it. I would've gone with the hard-as-hell oak but boy howdy was that expensive around here.
FWIW if you haven't built the stalls yet...I'd recomment looking at the Priefert stall systems instead of the "do-it-yourself" type of channel stall systems. That was my first choice when building and last minute I swapped it to the stalls I have now and have kicked myself since then. I swapped them solely because I was ordering so much other stuff from one company that they were bringing it on a flat bed and if I added stalls from there too they voided the shipping charges. Dumb. The Prieferts are welded complete walls that you just measure and slide the wood into and then stand up and bolt/drop pin together. MUCH easier to build and get them perfectly square but also easy as pie to swap out a broken board and even easier to remove a center wall to double a stall size. Just remove end pins and slide the wall out. And they're around the same price. (and better looking)
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Well dried Oak is probably the best...it is also very expensive. I used 2x12 treated pine and did exactly as you describe with the channels. The barn has been up for over eight years and there has been some warped boards. They don't all lay flat BUT I like the ventilation. Being in the south we build for ventilation not weather proofing. I used treated pine so I don't have to worry about termites and dry rot destroying my barn.
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Any time I've seen pine used, even TIG, the horses always manage to gnaw it up. Worse if you're planning to leave space between the boards, but even for a smooth wall they love to chew it up. Even my pair of beavers don't touch the oak
We used mostly rough sawn oak in our stalls. Our newer barn does have some pressure treated pine down low to the ground. If you want to keep your walls straight, I highly recommend stall stiffeners http://www.woodstarproducts.com/Stal...87c71ab47f1598. They came with our stall kits for our newer barn and we liked them so much, we bought more for our older barn.
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Rough oak straight from the saw mill, and as bludejavu said, treated pine for the two boards closest to the ground. For a stall stiffener (hadn't see this product), we used a piece of decking board on each side of the wall with a lag bolts (3, I believe) holding them together. We recessed the bolt heads/nuts/washers into the wood, so there wasn't a protrusion.
I have rough cut oak and hickory in the run-in shed, and I'm planning to use the same for stall walls. Boards will probably have to run vertically since I don't have enough 12' tree sections to make what I'd need.
(Seriously leaning towards those Priefert components, though having metal on the ground edge doesn't seem like a good idea. Or is it up off the ground a bit? I can't tell from the pictures.)
We used a channel system (had a local fabricator make the u-shaped channels, and it was WAY cheaper than the stall kits) and a mix of lumber types. Treated lumber for the boards closest to the ground, to protect from moisture, then pine, since that was the most cost-effective, then rough-sawn oak for the tops and any high wear/stress areas.
The oak is really sturdy, but it was pricier, heavier, and definitely needed to be pre-drilled when we were building the doors.
The pine was cheaper, softer, lighter, and oh-so tasty and chewable.
I'm pleased with our results, functional and cost-effective, but I do have at least one friend who is disgusted by the "patchwork" appearance of my stalls. Too bad, my barn, I don't take boarders, so it's just me and my horses that have to like it
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Ours are 2 x 8 pine. I did keep the boards weighted on a flat surface until they were bone dry, so minimal warping. Tongue-in-groove is nice, but wasn't in my budget and I've had NO problems with my boards warping or shrinking.
Every surface within reach of a horse's teeth is sheathed in lightweight galvanized metal, so no chew-marks anywhere.
2 x 10 or 2 x 12 are nice, but HEAVY. Take that into consideration if it's a DIY project!
Previous barn had one stall with a removable wall (u-channels and boards) and yes, the 2"X12"s are really heavy.
If you think you'll be removing them yourself, go for the 2"x10"'s, it does make a big difference.
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PT lumber. I also have bars across the front of stalls. Horses haven't really chewed it. I have 2 12x12 stalls and the wall that divides them was put on sliding stalldoor hardware. The entire wall just pushes back against one wall to create a foaling stall. Wall is pinned into which ever position you are using. Really awesome design, super easy. No taking out heavy boards and than having to store them somewhere. I will try to post a picture later.
We have smooth southern yellow pine T&G boards on all 4 sides of the stalls. We have not had any problems with horses getting a hold of them with their teeth, and there is no warping. We can remove the divider walls from a channel to double the stall size.
If cost is not a concern, then I think oak is your best choice. I used a combination of T&G pine and spruce. The stalls are about 10 years old and I haven't had any trouble with warping or chewing. With bars on the top 1/2 of the stalls, there's really nothing for them to get their teeth on. However, they have chewed the casings on the exterior door openings (which are easily replaced) and around the window casings.