Over Insulation Attic

Blowing attic insulation isn t hard but it s dusty sweaty work.

Over insulation attic.

If you use fiberglass over loose fill make sure the fiberglass batt has no paper or foil backing. It needs to be unfaced. Over the insulation install start at the farthest corner. Try a spray foam insulation kit to fill cavities gaps cracks expansion joints and other sources of air leaks.

What is the right insulation for an attic. Creating a moisture barrier. More insulation installation tricks and tips work from the perimeter of the attic toward the door or hatch so that you don t trample all over the insulation you just. The higher the r value the better the thermal performance of the insulation.

Start in a far corner and start rolling out the foil over the insulation. You can add loose fill on top of fiberglass batts or blankets and vice versa. It s often used over existing insulation in the attic where moisture control isn t needed. Insulation level are specified by r value.

Cut around these items it does not have to be. The pros charge 1 500 to 2 000 to do a 1 200 sq ft. When adding additional insulation you do not have to use the same type of insulation that currently exists in your attic. R value is a measure of insulation s ability to resist heat traveling through it.

Faced insulation should not be placed on top of existing insulation in the attic. An un insulated attic should have some airflow to prevent humidity from building up in the winter which could condense and form ice. It helps resist moisture that can lead to mold or mildew and provides increased sound and thermal insulation. Typically houses in warm weather states should have an r 38 insulation in the attic whereas houses in cold climates should have r 49.

Alignment obstacles in the attic. Always cover the tops of the ceiling joists to make sure the insulation is deep enough to reach your target r value and. You can do it yourself for about 500. Warnings for installing.

To make insulating an attic easier grab a helper and set aside two days. As a result of evaporation people breathing and plant respiration air carries some. Another benefit of the ventilation is that it will keep your attic cooler in the summer as well as your house. One for attic prep and the second to actually blow the insulation.

The vapor retarder on top of or between layers of insulation can trap moisture. The table below shows what levels of insulation are cost effective for different climates and locations in the home. Supports braces and other obstacles. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all.

Rolls batts or blown in insulation. These insulation levels will keep heated air from migrating out in winter. In a cooling climate a good blanket of attic insulation helps keep the house cooler and reduces the load on air conditioning equipment.