The Richmond project is a rare attached garage model for me to undertake. We’ve decided to spray foam the garage ceiling to seal out vapour from the garage and to make the upper floor warmer. This uses a lot of foam but the job is at least easy to do when it is completely accessible.
Garage spray in progress
The dropped ceiling used to frame the main duct runs is now fully encased in foam
Hard to seal joist butt ends are foamed against the rim board. Many hard to insulate areas are done this way on the lower levels. The skylight frame is also foamed.