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.
Insulating garage roof trusses.
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It creates a breeding ground for mold and mildew and ruins the air trapping pockets that block heat flow.
Make sure that all of the pieces are the same size so that they fit into the trusses.
Box out light fixtures.
Look for water stains on the roof sheathing or damp or moldy spots on attic joists and existing insulation as a clue to where leaks might be.
This is part 1.
To answer some of your questions.
Some do it yourselfers commonly forget to leave air space between the fiberglass and the underside of the wood roof sheathing.
Insulating garage roof trusses.
However if you have a cathedral style garage roof you will need a scaffolding to get into the upper areas of the roof.
Water is insulation s enemy.
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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.
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.
To install the insulation overhead you need to staple the pieces to the roof trusses.
The tape will also make sure that there is an air pocket available in the insulation.
That s the wall you see in one of the pics.
In either case you will need to follow the general steps below to insulate your garage roof.
There are many methods that you can use for insulating garage roof trusses but the most popular one is definitely the foam board.