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.

Place a new layer of unfaced batts perpendicular to the old layer to cover any gaps in the lower layer. However you must guard against mold and mildew growth. Be careful no matter what you do in the attic. Any new batt or roll insulation installed over existing insulation in the attic needs to be without a vapor retarder face.

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. Unless you have rodent droppings or mold in the existing insulation you can leave it in place. Wet insulation is a breeding ground for mold mildew or rot.

Can you add new insulation over old insulation. If the insulation appears wet you have an underlying problem that needs to be addressed first. 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.

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. You can buy them unfaced or simply remove the paper or foil backing. 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.

In most cases existing insulation typically fiberglass batts installed between attic floor joists can be covered by new insulation. 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. Can you put insulation over existing insulation. Yes in most instances you can.

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. Any new roll or batt insulation installed over existing insulation in the attic needs to be without a vapor retarder face. Your home was built before the ban on asbestos so unless you get the insulation tested assume it is in there. Insert the ruler through the insulation until it makes contact with the attic floor.

The old insulation can be fluffed a bit with a leaf rake which will help.