A new client called me, saying that his insulation contractor urged him to contact me about some moisture problems in the home before they actually embarked on a major energy upgrade. (That was gratifying.) Many years ago the home had been moved off of a failing rubble foundation to a new concrete masonry unit (CMU) foundation on a different site.

But there was a puzzling stain on the fireplace support column. Here are the puzzle pieces:

Puzzle Piece #1:

I don’t do blower door work every day, but I do enough of it to appreciate the attention to detail that The Energy Conservatory (TEC) built into its new blower door kit. I have used both TEC and Retrotec blower door kits and found them trustworthy and rugged.