“Round Timberframing. Harvesting trees from the site where we are building and using the trees as round structural members is ideal. Certainly this is time and labor intensive, although structurally, round timbers outperform milled timbers of the same dimension. This is because of the natural spiral form of the tree grain which is lost when the tree is milled. This spiral form is what allows tree branches of large girth to hang horizontally to limits that seem unbelievable.