Thanks for the feedback. I already use 2x4s inside the barn (I have stall gates that don’t go all the way to ground). They do the job (mostly) but I’m now working on the openings of stall doors that lead out to the individual paddocks. There’s a very slight step down (barn is on a concrete pad) so paddocks are a few inches lower. I have mats outside each opening. The main reason I’m doing this is that bedding has become so expensive and my minis and ponies ALL drag tons of it outside and when it’s raining, I often end up with soaked bedding outside.
Truthfully, I also think that I would eventually trip and break my neck if I had a piece of wood to step over going in and out, pulling a muck bucket or feed or wheelbarrows. Much easier inside for whatever reason.
My bedding has gone from $5.99/bale to $8.99. I keep my stalls very deeply bedded (over rubber mats over the concrete floor).