You should have a vapor barrier between the insulation and the ceiling of your garage.
How to insulate the attic floor.
For example heating and air can come from clothes driers.
The solid base.
This is particularly imnportant if you have heating and air in the garage.
You ll want to buy enough batting to lay at least 10 to 14 inches over the entire space.
1a attic access door.
Stop using your attic for storage.
Take the insulation up to your attic so that you are above the garage ceiling.
For example loftzone storefloor is lightweight and very easy to install.
Start with the attic floor.
Loftzone raises the height of the lower chord of the attic truss.
To insulate an attic get some batting made out of mineral wool fiberglass or recycled foam.
Attic flooring consists of materials as basic as sheets of plywood as well as more elaborate interlocking floor systems.
In unfinished attic spaces insulate between and over the floor joists to seal off living spaces below.
Additionally purchase some loose fill insulation to insulate corners and angles where the batting won t fit.
Even easier you can also use a prefabricated attic floor kit designed specifically to raise the attic floor above the insulation.
The moisture will condense on the wood and insulation reducing the insulation r value and encouraging the growth of mold and mildew.
With a finished attic insulation must help keep the attic areas comfortable.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.
How to lay attic flooring on top of fiberglass insulation.
If you have to insulate around electrical boxes or cables then support from an electrician might be needed as part of the process too.
How to insulate a finished attic.
That means insulating the attic floor only not the walls and having vents in the roof.
If you need regular access to your attic it makes sense to build a catwalk before you insulate the floor of your attic.
This allows the full depth of attic insulation to work as intended.
To build a catwalk you would usually elevate a section of the framing perhaps with 2x6s installed at 90 degrees to the joists and you would install osb or plywood on top of the elevated framing.
Take up the floor allowing you to see the joists.