4, Tongue and groove
Home Up 2, After drilling holes 3, Once posts are set 4, Tongue and groove 5, Help building walls 6, Walls from road 7, After building walls 8, Holes in the posts 9, After drilling holes 10, Ready for the tarp 11, Laying out the tarp 12, Slide the tarp over 13, Tarp pulled over 14, Lacing the tarp 15, Fastening the tarp 16, Pulling excess 17, Floor cement 18, Setting the post 19, Building the fence 20, Pigs, new building 21, Back view, winter 22, Bales covered

 

(Click on picture for larger version.)

As you can see in the photo, the boards are tongue and groove, making the walls more sturdy.