Attic Insulation Batts Over Blown

For this we use owens corning propink.

Attic insulation batts over blown.

Loose fill or batt the common term for blanket insulation. Fiberglass comes from what i ve heard one major fiberglass insulation manufacturer call a rapidly renewable resource sand. The vapor retarder on top of or between layers of insulation can trap moisture. For diy attic insulation you ve got two choices.

In the vapor barrier. Before choosing blown vs. Input length width and desired r value of the area to be insulated. A bag of cellulose runs about 11 50 and will cover 36 7 square feet at a.

Batt insulation is available at home centers and lumberyards. Can i even do it this way because of the existing blow in insulation as far as moisture getting in between the blow. I don t want to add more blow in insulation. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all.

This calculator is to be used as an estimating tool only. If you are upgrading your attic space we blow in insulation on top of your batt to achieve desired insulation values. I live in chicago and my house is cold. To install fiberglass batts over existing insulation lay the batts perpendicular to the joists so they do not compress the insulation below.

How do i lay the batts over the blown in insulation. 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 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. Blown in insulation requires a professional. Attic insulation is accomplished with either fiberglass blankets batt or blown in insulation. 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.

Click the button to calculate the depth in inches and pounds of total insulation required for this job. 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. If properly done this should not cause a condensation problem in the wall cavity unless you are leaking interior air thru gaps etc. Unfaced batt insulation friction fit between studs in walls with poly vapor barrier over walls and ceilings blown in attics with minimum r 40 insulation attention to detail.

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