We recently bought a historic ranch with beautiful 100 year old barns! They are structurally sound but very drafty, to the point snow drifts in. We’re in Colorado near a mountain peak at 8500ft elevation, so we get blizzards and a lot of wind. We would like to insulate them better and make them more weatherproof before housing livestock and storing hay – what’s the best way to do that while maintaining their historic appearance?