To install the insulation overhead you need to staple the pieces to the roof trusses.
Insulating garage roof trusses.
To answer some of your questions.
In either case you will need to follow the general steps below to insulate your garage roof.
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Make sure that all of the pieces are the same size so that they fit into the trusses.
I am planning on insulating and finishing the outside walls.
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Box out light fixtures.
If you have a flat garage roof and an attic above you can install the garage insulation from below using a standard ladder.
You should use some foil tape to make sure that the insulation is stable on the roof edges.
Water is insulation s enemy.
That s the wall you see in one of the pics.
There are many methods that you can use for insulating garage roof trusses but the most popular one is definitely the foam board.
This is part 1.
It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow.
Insulating garage roof trusses.
The garage is free standing not attached the previous owner used this property as a vacation rental and walled in one bay of the garage up to the trusses presumably for personal storage.
The tape will also make sure that there is an air pocket available in the insulation.
Some do it yourselfers commonly forget to leave air space between the fiberglass and the underside of the wood roof sheathing.
However if you have a cathedral style garage roof you will need a scaffolding to get into the upper areas of the roof.