How to insulate this?

[Repsolracer22]

Ok. Have a 2 car garage attached to the house. Cleaning it out and want to finish it with drywall and painted floor. As you can see, the left side and ceiling is drywalled already. But the back wall and right wall are not. And the entry doorway too.

I have a drywall guy. But what/how should this be insulated first? It's wood, so I don't know if moisture can penetrate some and then mold up the insulation?? Should I flash it with spray foam then regular stuff on top or what? Should I scrap the foam and just put regular pink fluffy insulation in there and call it a day? Should there be a moisture barrier of some sort first?


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[Aftermath]

I would just put batts in. Either use batts with kraft paper or unkrafted with 6mil plastic. The kraft paper or plastic will be your vapor barrier. Vapor barrier almost always gets installed on the warm side of the insulation.

D.

 

[Repsolracer22]

What is kraft paper? Just insulation that has paper on one side?


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[Erampu]

Yes, Kraft paper is the paper on one side of insulation. Some insulation has a foil faced paper. Aftermath said it all.

 

[JCByrd24]

The simple rule of vapor barrier on the warm side is over simplified old school thinking and likely not a good idea, especially plastic, I would definitely skip that step. Kraft paper is a more appropriate retarder itself but cannot really be installed as such but your drywall with a coat of paint is actually perfect along with the more importantly air sealing all the currently exposed exterior sheathing as best you can and do the drywall as you put it up as well... In any event, it's a garage so vapor likely won't be an issue unless you vent your clothes dryer there or burn and unvented propane heater which you shouldn't do once insulated and sheet rocked. I take that back, on a hot humid MD summer day if you put up plastic it could trap vapor drive from the outside. Even in heating dominated climates if the summers are humid interior vapor barriers have proven to be bad and unnecessary.

 

[patrick66]

You can have it spray-foamed, which has to be done professionally. Were this mine, I'd go that route.