Nomad Shelter use Alaskan white spruce from Fairbanks on all yurt lattice sizes. All lattices are router ed and finished with Danish Oil. There is no need for vertical bracing. Our lattice is nominal 1"x2" and the connectors are all heavy duty stainless steel rivets providing structural integrity not just aesthetics. Walls on the 20-foot and 30-foot diameter yurts are 7' standard. The 16-foot diameter yurt has a 6' wall.