Our Swedish wooden house from '35 is built with Tretex on the inside, two-inch standing tongue-and-groove wood, 1-inch horizontal sections filled with wood chips about 600 mm wide, about 15mm of rough-sawn wood, paper, and exterior paneling. It was very cold on the back when sitting on the sofa against the outer wall with that construction, and when we changed the exterior paneling, we added 80 mm of West Coast insulation. The comfort in the house improved significantly.