|Source:||National Institute of Standards and Technology|
|Date:||4/1/94 Record No.: 10072|
|Contact:||Hunter Fanney, 301-975-5864|
Insulation R-Value Measurement
Develop measurement standards and technniques, and certify NAHB measurements. New higher insulation value materials can be harder to measure accurately; for example, gas-filled panels have an R-value of about 15/inch, powder evacuated panels 25/inch, and vacuum stainless steel is estimated theoretically to reach as high as 100/inch. A large calibrated hot box can accommodate actual size wall systems for detailed performance measurements vs. temperature and humidity, including weather cycles.