Insulation by definition does not necessarily tighten up a house (think fiberglass batts) but many types of insulation do:
– spray foam
– foam board (as long as it is sealed at seams with the proper tape, and at edges with “good stuff” type spray foam.
So that’s been the story with the insulation we just added to this house:
– walls (there was none) => DENSE PACK CELLULOSE
– garage wall and ceiling separating garage from the house
– attic (loose fill cellulose, lots of spray foam filling up leaks everywhere, and some poly iso foam board on a few knee-wall areas touching living space)
Original blower door was 3000+ CFM50. The one today after the work was 1400 CFM50.
I am not sure I quite believe it, but we’ll see… I believe an inspector will also do a blower-door test.
– windows and doors
– cathedral ceiling (someday…. maybe 4″-6″ of polyiso right on the existing drywall, with new drywall over it?)
LINK: MASS SAVE
Interesting, Washington state has a new-building requirement for SLA — Specific Leakage Area