Attic Insulation Batts Over Blown

For diy attic insulation you ve got two choices.

Attic insulation batts over blown.

I bought r 38 faced batts. If properly done this should not cause a condensation problem in the wall cavity unless you are leaking interior air thru gaps etc. 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.

Cellulose insulation has an average thermal value of r 3 7 so you d need just over five inches to equal an r 19 batt. Blown in insulation is then applied over the batt level to fill any voids and gaps around joists and other structures and to increase the level of insulation to recommended levels. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. Any new batt or roll insulation installed over existing insulation in the attic needs to be without a vapor retarder face.

My attic has very very little existing blown in insulation in between the joists. Blown in insulation requires a professional. I live in chicago and my house is cold. The vapor retarder on top of or between layers of insulation can trap moisture.

How do i lay the batts over the blown in insulation. Click the button to calculate the depth in inches and pounds of total insulation required for this job. This calculator is to be used as an estimating tool only. Batt insulation take time to read this column.

Fiberglass comes from what i ve heard one major fiberglass insulation manufacturer call a rapidly renewable resource sand. Input length width and desired r value of the area to be insulated. If you are upgrading your attic space we blow in insulation on top of your batt to achieve desired insulation values. Before choosing blown vs.

I don t know about that but it s a common insulation material that works much better in the blown form than in batts. With the paper face down or up. I don t want to add more blow in insulation. The photo above shows an attic insulated with blown cellulose.

In the vapor barrier. Can i even do it this way because of the existing blow in insulation as far as moisture getting in between the blow. Both can be added to uninsulated attics or layered over existing material. Loose fill or batt the common term for blanket insulation.

Batt insulation is available at home centers and lumberyards. For this we use owens corning propink. A bag of cellulose runs about 11 50 and will cover 36 7 square feet at a.