Adding Attic Insulation Over Existing Insulation

Batt or rolled insulation or blown loose fill insulation fiberglass or cellulose can be installed on top of old insulation. When adding roll the insulation perpendicular to the joists not parallel. Install fiberglass batts over existing batt insulation.

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The structural elements are usually exposed in these areas which makes it easy to see what type of insulation you have and to measure its depth or thickness inches.

Adding attic insulation over existing insulation.

To install fiberglass batts over existing insulation lay the batts perpendicular to the joists so they do not compress the insulation below 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. Do not tack down any rolled insulation. Any existing batt or roll insulation in your attic needs to have the facing against the attic drywall floor or no facing at all. You can add loose fill on top of fiberglass batts or blankets and vice versa.

The vapour retarder on top of or between layers will trap moisture. It needs to be unfaced. Faced insulation should not be placed on top of existing insulation in the attic. Insulation should be rolled out perpendicular to the joists and unfaced rolls should be used.

The vapor retarder on top of or between layers of insulation can trap moisture. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all. Add the right kind of insulation. How do i add insulation to existing attic insulation.

When adding additional insulation you do not have to use the same type of insulation that currently exists in your attic. Check the depth using a tape measure. Measure how much insulation you already have. Any new batt or roll insulation installed over existing insulation in the attic needs to be without a vapor retarder face.

Adding rolled batt or blown in insulation over existing insulation is not a problem. It is vital that any new batt or roll insulation that is installed over existing insulation in the attic be without vapour retarder. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all. Put on goggles and gloves to protect yourself while handling.

If you use fiberglass over loose fill make sure the fiberglass batt has no paper or foil backing. Check the attic walls and floors adjacent to an unheated space like a garage or basement. Don t add faced insulation on top of your existing insulation because the vapor retarder in between layers leads to trapped moisture.

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