how to insulate garage ceiling

Old 11-19-08, 05:23 PM
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how to insulate garage ceiling

my attached 1 story (UNINSULATED) garage roof is 2x4 truss construction. The bottom of the trusses (to which the ceiling drywall is attached) extend beyond the exterior garage walls to create the soffet... which has built into it a continous vent around 3 sides. On the 'attic' side of the garage ceiling, there is nothing separating the soffit vent from the remainder of the attic.
I want to install fiberglass batt insulation between the trusses. Do I need to first build a barrier (1"x6" plywood panels) in the attic above where the exterior walls are to separate the 'interior' of the attic that will have insulation from the soffit area.... so that there is no chance that the fiberglass will shift and cover the vents?
Old 11-19-08, 06:33 PM
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Welcome to the forums! You should use insulation baffles above your insulation in the soffit area to allow air to move from the soffits to the ridge vent. You don't want to obstruct this air flow. The air in the attic must remain as close to the temperature outside in order to prevent ice from forming due to the difference of temperatures.

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