How to insulate top of wall between garage and utility

[Bungle139]

Hi

Newly built attached garage with utility at the back. The utility has a warm roof. The garage is not insulated but caviry wall between garage and utility room.

Should i be insulating the top of the walls, sealing the gaps where the joists run? If so what the recommended method?

Photos are around the top of the 3 external walls of utility room.

Thanks

 

[23vc]

Yes with PIR and foam the gaps