Horse fence, post and board

Sterling Fence Inc.'s post and board style can be done  with different material, What we have found that works well is 3 rail, using a 5" x 8' post, setting them 8' or less apart. Using 2 x 6 x 16' boards, the fence is aprox 48" to 50" tall, The boards we like measure 1 1/2 " x 6" x16'. We always use treated  wood,