Walls and Roofs
Why Your Walls Get Wet: A 'Building Science Made Easy' Guide to Understanding the Dew Point
...two-thirds rule for insulation
By putting enough insulation on the outside of your house (and retrofitting existing homes with exterior insulation) you keep the structural parts of the wall warm. By keeping the wood studs and plywood at indoor temperatures, the air never gets cold enough to reach its dew point inside t...
