Details & Upgrades Back Vertical With Pickets – Board on Board Gallery Showing Slide 1 of 9 Material Design & Upgrades: Build Out 4 x 4 Treated Pine Posts2 x 4 Treated Pine Rails (x2)1 x 6 Western Red Cedar Pickets½” Board Overlap Durability Upgrades 2 x 4 Treated Pine Rails (x3)