Building Envelope Sheet
How does P2000 enhance the standard building envelope?
In today’s marketplace, insulation is sold based on center of cavity thermal resistance, or R-value. However, R-value is only one piece of the thermal equation. A list of common issues that plague conventional insulations when installed in a building
- Conductive heat loss
- Air leakage and convective heat loss (can be 35% of heat loss/gain in a building envelope)
- Moisture infiltration (water is highly conductive)
- Radiative heat loss (can be 55% of heat transfer in ordinary air spaces)
- Installation deficiencies
- Thermal bridging (average of 25% of a residential building’s surface area is framing)
- Long term stability
Most of the thermal performance testing completed on conventional insulations focus on their resistance to conductive heat transfer as measured by R-value in the ASTM C518 test. This standard laboratory test measures thermal resistance under a specific set of conditions. In reality, R-value of a particular material is dependent on a number of environmental and installation parameters, external to the material itself.