New Attic Insulation Over Old
Any new batt or roll insulation installed over existing insulation in the attic needs to be without a vapor retarder face.
New attic insulation over old. Your home was built before the ban on asbestos so unless you get the insulation tested assume it is in there. Can you add new insulation over old insulation. Always use unfaced batts both when laying product for the first time and to prevent moisture from becoming trapped between new and old layers of insulation.
The vapor retarder on top of or between layers of insulation can trap moisture. Can you put insulation over existing insulation. The old insulation can be fluffed a bit with a leaf rake which will help.
The levels of attic insulation recommended today by energy star are substantially higher than those used earlier so it s worth checking out what s recommended in your geographic area. Unless you have rodent droppings or mold in the existing insulation you can leave it in place. 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. Take a quick visit up to the attic armed with a ruler to determine how much insulation is there. If it s clear the insulation level is well under 12 inches or you cannot see the floor joists you could certainly benefit from adding more.
Place a new layer of unfaced batts perpendicular to the old layer to cover any gaps in the lower layer. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all. The vapor retarder on top of or between layers of insulation can trap moisture.
Yes in most instances you can. In most cases existing insulation typically fiberglass batts installed between attic floor joists can be covered by new insulation. Be careful no matter what you do in the attic.
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