Attic Insulation Batts Over Blown

I live in chicago and my house is cold.

Attic insulation batts over blown.

With the paper face down or up. A bag of cellulose runs about 11 50 and will cover 36 7 square feet at a. For diy attic insulation you ve got two choices. Attic insulation is accomplished with either fiberglass blankets batt or blown in insulation.

Batt insulation take time to read this column. 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. My attic has very very little existing blown in insulation in between the joists. Fiberglass comes from what i ve heard one major fiberglass insulation manufacturer call a rapidly renewable resource sand.

In the vapor barrier. For this we use owens corning propink. If you are upgrading your attic space we blow in insulation on top of your batt to achieve desired insulation values. Once you ve decided which type is best for you examine the material options and prices to home in on the right product.

Before choosing blown vs. Any new batt or roll insulation installed over existing insulation in the attic needs to be without a vapor retarder face. To install fiberglass batts over existing insulation lay the batts perpendicular to the joists so they do not compress the insulation below. 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.

I bought r 38 faced batts. Both can be added to uninsulated attics or layered over existing material. How do i lay the batts over the blown in insulation. 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. Click the button to calculate the depth in inches and pounds of total insulation required for this job. Can i even do it this way because of the existing blow in insulation as far as moisture getting in between the blow. This calculator is to be used as an estimating tool only.

If properly done this should not cause a condensation problem in the wall cavity unless you are leaking interior air thru gaps etc. Input length width and desired r value of the area to be insulated. I don t know about that but it s a common insulation material that works much better in the blown form than in batts. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all.

Batt insulation is available at home centers and lumberyards. The photo above shows an attic insulated with blown cellulose. I don t want to add more blow in insulation.