"I don't think I'd go any further out than 10 years for major air sealing (done at the high pressure boundary). That's assuming the foam is getting pretty good contact with the surrounding wood or other mechanically fastened A/S…"
"I would agree about the technique comment. The air sealing done in my attic was a combination of single part foam for chaseways, wiring and plumbing penetrations, and a little mesh & densepack cellulose on two small kneewalls. The…"
"There was something there to make it look like there was a correlation between cooling degree days and increased kwh usage.
Or, there was no correlation, but it is too hard to interpret reliability statistics, and no one wants to pay for…"
"I'm guessing that is the short metal tube that comes with the DG. If that is the case, go with perpendicular to the pipe. Might want to trim some of the pipe insulation off as well before the job is completed. The insulation…"