Any new batt or roll insulation installed over existing insulation in the attic needs to be without a vapor retarder face.
Installing attic insulation over existing insulation.
To install blown in insulation in existing walls holes are drilled at the top of each stud space usually on the exterior and material is blown in via a long flexible hose.
This method can be used in any climate though it historically has been most popular in colder climates.
Faced insulation should not be placed on top of existing insulation in the attic.
Before installing determine the insulation material best suited for your home.
Over the insulation install laying foil over on top of insulation on the attic floor this is probably the easiest method to install radiant barrier atticfoil is to lay the foil out over the existing insulation on the attic floor.
Choose your insulation type.
Whether you live in a warm weather state as i do or in a cooler northern climate it s hard to stay comfortable and keep your energy bills in check if you don t have adequate insulation in the attic.
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Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all.
The hole is then.
Install fiberglass batts over existing batt insulation.
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The vapor retarder on top of or between layers of insulation can trap moisture.
How do i add insulation to existing attic insulation.
Cost effective way to save energy with this old house general contractor tom silva.
To install fiberglass batts over existing insulation lay the batts perpendicular to the joists so they do not compress the insulation below.
Put on goggles and gloves to protect yourself while handling.
Measure how much insulation you already have.