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In looking at the insulation it is R19 instead of R30 and is not up against the floor of the bonus room but rather at the bottom of the void to be flush with the garage ceiling sheetrock. The ends were also left open which seems it will allow for thermal bypass according to some guides I've looked at. It looks like it should at a minimum be up against the floor of the bonus room using wire to hold it in place and preferably R30. Thoughts? Sheetrock goes up this week. Thanks!

I'll post photos in a subsequent reply.
 

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Many threads here about cold room above an unheated garage. Heat in the room above has difficulty getting down to the floor.

As Neal said, some advise installing the insulation up against the floor while others say down with a gap above. I say fill it full as that area needs all of the help it can get. I also like Roxul as it cuts to a tight fit and installs neatly and neatness counts. The stuffed-in insulation in that center picture would net you about r-10 total performance.

Caulk the perimeter at each joist cavity and the rim to foundation. Air infiltration is a major source of heat loss.

Bud
Citations available for high vs low if you choose to not fill the cavities.
 
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