Originally Posted by Windows on Wash
Are you just talking about the garage kneewall areas?
Foam blockers that are spray foamed will stop the air. No need to dense pack and you won't be able to effectively do it. Stopping the air is about 85% of the problem.
Spray foam seal the sill plate and any wall penetrations.
Back the wall with another layer of fiberglass or rigid foam.
No vapor barrier required.
No knee wall.
I sprayed Cellulose before and built a rig to dense pack. Now can I gurantee I met the actual dense pack requirement, No. But it was defineately more densely packed as I heard the machine whine and I slowly moved the pipe down. I dense pack to avoid settling and I do not think there was going to be much settlement after I dense packed.
I would love to seal the SIL plate, because that is another area for leak penetration, but there is sheetrock on the walls and T1-11 on the outside. Any suggestions on how to do that?
I was thinking about installing 1/2" Tuf-R. It has a silver side that I think is a vapor barrier, so does it matter if I have a vapor barrier? Again it is just the ceiling I am insulating.
You mentioned, "Back the wall with another layer of fiberglass or rigid foam". I was not planning on insulating the walls. Sheetrock is on the walls and I doubt there is insulation in them. The garage door has openings everywhere and I was not planning on trying to insulate the garage itself. Should I??
Also there is some Fiberglass batt insulation already installed, but from what I read it is nearly impossible to install that properly. Too Short, Too Long or around pipes and wires all problems. I had two thoughts. Keep the fiberglass in cavities with no wire and etc. or move it to the attic above the joist, where it might work better.