I have a 12X20 garage and I can't remove the garage door due to condo docs... how do I keep the door sealed well and allow it to breathe without mold accumulating? I want to put an interior wall with R19 and sheetrock it... there will be some space between the new wall and the exhisting garage door... do I vapor barrier the door first? Or do I vapor barrier behind the sheetrock? And would R-19 be best or R30 I live in the northeast... I have read so much on vapor barriers and still don't know if I even need one... considering the breathing factor... also faced or unfaced insulation... any help is appreciated.Also tuck tape?
Debbie

Yes, you will need a vapor barrier on the warm side of the studs. Whether you use R19 or R30 is up to you. Consider the cost difference an investment. A good investment in my opinion, as I see a major increase in energy cost coming in the near future.

Hi Debbie...

Harold touched on facts. I wanted to pop in and answer the last part of your question... faced or unfaced batts of insulation?

You'll want to install UNFACED BATTS in the new stud wall and then install the vapor barrier in between the sheetrock and the new studs or as Harold said, "on the warm side of the studs".

If you use a faced insulation and a vapor barrier you would be installing a DOUBLE VAPOR BARRIER in a manner of speaking that would eventually trap mositure and could cause mold/mildew issues.

Any more questions? If so, post below to reply!

Mark