Final Sidewall Numbers

Well, we completed the lower level of sidewalls today. No injuries or deaths...

The most recent blower door reduction was 204 @ CFM50 for the lower level. This brings the overall reduction from 2,778 @ CFM50 to 2,344 @ CFM50. In essence, the sidewalls brought the blower door reduction down 434 @ CFM50. This reduction is equated to closing up a 4.5" x 4.5" hole in the wall to the outside.

So not only will the home retain heat and A/C better - the overall draftiness will be greatly reduced.

Remember, anything BELOW 2,750 @ CFM50 is to be optional air sealing. We are now below the optional.

The only thing that is "left" to do - and I haven't decided to at this stage - is to pump foam into the above grade masonry block to stop that air leakage and insulate to the frost line. The hesitancy is due to only having 3 small areas to insulate due to ground height (it's above almost to the sill plate).