What is infiltration and exfiltration you e probably asking ?
Infiltration: Cold outside air entering (infiltrating) the living space though a void in the building envelope. Exfiltration: Warm air exiting (exfiltration) the building envelope thru a similar opening or void in the building envelope. I’ve written this in non-technical terms about as simply as I know how… Infiltration – Exfiltration Losses Don’t read the following wrong… Adequate insulation is also very important. But FIRST, consider the following. Insulation (or lack thereof) is RARELY ever the main source of energy loss in most residential building envelopes. In almost all instances, losses due to inadequate insulation ranks a far distant second. Rather, in most cases and especially in residential structures, infiltration losses (literally due to “holes” in the structural envelope) account for the lion’s share of energy loss. Having R-30 insulation throughout one’s home will be of little benefit if your building envelope leaks warm air like a sieve. To put it in more understand
