My attic currently has about six inches of loose-fill insulation (loose insulation pieces) and no vapor retarder. If I want to add another six inches of insulation, what type should I use?

Always use unfaced fiber glass insulation with no vapor retarder when adding another layer to existing blanket or loose-fill insulation. If your attic has existing insulation but no vapor retarder, you will need one square foot of free vent area for each 150 square feet of attic floor area. (To add ventilation, consider a combination of soffit and roof vents.

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