Peter Yost is the founder of Building-Wright, a building performance consulting firm based in Brattleboro, VT. He is also former vice-president of Building Performance for BuildingGreen and a founder and current technical director of Green Building Advisor.
A flash-and-batt system is one way to warm the first condensing surface with air-impermeable insulation.
The building science behind common moisture problems in attics and roofs, and a practical guide on how to prevent them.