HELP ME PLEASE .... I am in the process of remodeling an early 1900 built family farm house. On the outside walls, but on the inside of the house, there are diagonal boards. I first thought this may be an 'pre-insulation' way to help keep the house warmer, but some told me it was an early form of bracing to help keep the house structurally sound. Any insight would be VERY much appreciated.