How difficult is it to install insulation ?
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I bought a fixer upper and there must of been a leak at one time because the sheet rock in the garage is missing. I hired a com to install sheet rock but didon’t ask him to put insulation now my bathroom floor is freezing. Which is directmy over the garage
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You will have to remove the sheet rock in garage ceiling and put in the insulation, then re-sheet rock. OR tear out the bathroom floor and have heating installed in the floor.
It can be blown it, but should be left to the professionals.
Sorry but the person you hired was not every good. Even a licensed handyman ought to know basic building code. Barbara is correct, you need to remove the sheetrock, install the correct insulation (to code), then re sheetrock. That is easier than ripping up your bathroom floor, unless you were intending to do so anyway. For future reference, see if these help.
https://www.consumer.ftc.gov/articles/0242-hiring-contractor
https://www.travelers.com/tools-resources/home/renovation/checklist-for-hiring-the-right-contractor
You would have to remove the drywall on the garage ceiling to install the insulation, and put in sheet fiberglass. https://www.youtube.com/watch?v=dee7g_HtMIQ
You could hire someone to come in an drill holes in exterior or in the drywall and blow-in insulation .... https://www.youtube.com/watch?v=R-7lQPBedpc
or you could have someone remove the drywall and use spray foam insulation. https://www.youtube.com/watch?v=cMQYEjJyHVc he has some real good points about the rafter ends and gaps to be filled.
AND because the bedroom is above the garage... there is a special process to "seal" the garage to keep fumes from entering the house.