It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow.
Insulating garage roof trusses.
The tape will also make sure that there is an air pocket available in the insulation.
I am planning on insulating and finishing the outside walls.
If you have a flat garage roof and an attic above you can install the garage insulation from below using a standard ladder.
To answer some of your questions.
This is part 1.
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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.
There are many methods that you can use for insulating garage roof trusses but the most popular one is definitely the foam board.
In either case you will need to follow the general steps below to insulate your garage roof.
If you are insulating the garage ceiling not only by the truss level but also up by the roofline then you must leave at least 1 1 2 to two inches of air between the fiberglass and the underside.
However if you have a cathedral style garage roof you will need a scaffolding to get into the upper areas of the roof.
You should use some foil tape to make sure that the insulation is stable on the roof edges.
The main benefit that it provides is it s very cheap yet at the same time it manages to provide the broad coverage that you need very fast.
To install the insulation overhead you need to staple the pieces to the roof trusses.
Water is insulation s enemy.
That s the wall you see in one of the pics.
Insulating garage roof trusses.
Box out light fixtures.
Some do it yourselfers commonly forget to leave air space between the fiberglass and the underside of the wood roof sheathing.