September 3, 2009
Preppy in Pink - Insulation on the Outside
Passersby may be wondering why THE CONCORD GREEN HOME is sporting pink. Actually, its all part of the strategy to super-insulate this house.
We grew up thinking that the old pink fiberglass insulation goes on the inside of the house. Its a whole new world. No spun glass here. Thick and rigid Extruded Polystyrene (XPS) insulation, installed here over Green Guard's Raindrop house wrap, acts as a great thermal barrier, and is supplemented by additional healthy insulation on the inside. This strategy achieves R-values that are significantly higher than required by code (R-value is the measure of resistance to heat flow). The higher the R-value, the better the insulating properties, and the lower the energy consumed to keep temperatures comfy inside.
Next, strapping (long thin strips of wood) is applied over the rigid insulation, which creates an air space between the insulation and the clapboard, also known as a drain screen. This allows moisture to evaporate instead of building up behind the exterior cladding, which can wreak havoc on the health of the structure.