The Blower Door - Revisited

We've touched on the blower door in the past - it's time to touch on it again. The blower door is a great tool to detect air leakage, NOT insulation.

The blower door is used to set the bar for the tightness of a home. A home should not be completely tight - however is should be to a certain level. 2,750 CFM50 is where "optional" air sealing begins.

The last house I tested came in at 2,195 at CFM50 with an A-ring. The clients were astounded when I said they had minimal issues. Minor caulking to be done along the sill plate in the basement - but that was it. The biggest issue the client had was with a hole cut into a wall - this had nothing to do with air sealing.

So...the blower door is a tool, not an all-saving answer...