Insulating drop ceiling after spray foam

[Boomer343]

Pulled down an insulated drop ceiling in an attached garage to have the floor joists in the rooms above the garage sprayed with 2 pound foam.

The foam has encapsulated the area as the foam comes down to the 2 x 6 drop ceiling framework. So the 10 dollar question is do I put the old fiberglass batt insulation back up and then put a 6 mil vapor barrier up and seal it or insulate with no vapor barrier or put up the drywall and let the foam act as the insulation and vapor barrier. 4 inches of foam so roughly R28.

The area will be unvented so that is what has me flipping between the options.

Any suggestions?

 

[Jbullfrog]

no additional insulation or vapor barrier should be needed.

 

[dlenkewich]

Drywall and you're done.

You never want to trap insulation between two vapour barriers.

 

[Boomer343]

Thanks for the replies. I put the batts back up, no sense in throwing out R28 insulation.

I won't put up a poly vapor barrier before hanging 5/8 fireguard.

Looks like the walkout basemwnt walls are going to get sprayed as well.....forget the insulation value the selling point was keeping out bugs, especially spiders....LOL

Makes my life a lot easier not having to redo the whole thing with batts and poly.