# How many bags of insulation do I need for attic?

For example, if the square footage of the room you’re planning on insulating is 1,000 square feet and you want to achieve an R-value of 60, you will need approximately 17 bags to fully insulate your room.

Calculate attic area

1. Measure the outside of your home.
2. The interior attic space may differ (e.g., additions, varying levels of insulation). Separate into smaller spaces from the largest area.
3. Multiply the length and width of each area.
4. (A + B + C) ÷ 144 = total square footage.

One may also ask, how much blown insulation should be in the attic? R-Value is a measure of insulation’s ability to resist heat flow. The higher the R-Value, the better the thermal performance of the insulation. The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.

Then, how many bags of blown insulation do I need?

Average Cost of Blown-In Fiberglass Insulation

R-Value Bags Per 1,000 Sq. Ft. Installed Thickness (Inches)
R-30 15 10.25
R-38 20 13
R-44 23 14.75
R-49 26 16.5

How many sq ft does a bag of insulation cover?

10 bags/pallet is equal to 110-pieces/1065.60 sq. ft. The right insulation can save on energy and heating and cooling bills. Check out our Buying Guide for helpful tips.

### How do I know if my insulation is blown?

Cellulose blow-in insulation is constructed out of recycled paper. To determine how much cellulose insulation you need, take the square footage of the space and divide it by either the depth or the desired R-value. Fiberglass blow-in insulation is essentially made up of spun fibers from recycled molten glass.

### Can you have too much attic insulation?

But there may be a theoretical point of “too much.” If a home is over-insulated and is too tightly sealed, moisture can get trapped inside. Without proper ventilation, a home can build up too much moisture, especially in the attic (warm air rises), which can cause mold problems and, overall, lower indoor air quality.

### How much is a bag of blown in insulation?

On average, a 19-pound bag of blown-in cellulose insulation also costs about \$30, but it covers about one-fourth of the amount of space as fiberglass loose fill insulation. Cellulose is a more natural alternative to fiberglass, but it’s generally more expensive.

### How much does it cost to put insulation in the attic?

It can cost anywhere from \$1,700 to \$2,100 or between \$1.50 and \$3.50 per foot to insulate an attic depending on what insulation material you choose. Blown-in insulation is the least expensive option and ideal for older attics. Spray foam, while the most expensive, is best for noise reduction and new construction.

### How do I know if I need insulation?

Measure the height and width of any windows or doors in the wall. Multiply the measurements to find the area of each window or door, and subtract them from the total square footage of the wall. This gives you the square footage of insulation you need for that wall.

### How deep is r30 blown insulation?

Blown in Fiberglass Attic Insulation R-Value Minimum Thickness Bags per 1000 sq ft of net area R44 17.4” 26.9 R38 15.3” 22.9 R30 12.4” 17.6 R19 8.1” 10.8

### How long does blown in insulation last?

around 20 to 30 years

### How many bags of insulation do I need calculator?

Example Calculation = 12 Area = 10 * 6 = 60 square ft Required depth to achieve R value needed = R 12 / R 3.6 = 3.3 inches Volume needed = 60sq ft * 0.275 (3.3 /12 converting to decimal ft) = 16.5 cubic feet You would need one bag in this case. Note: the cost is based on rounding up the number of bags needed.

### What is the best attic insulation?

Keep in mind that even the best insulation will not protect your home from the cold if it’s not installed properly. Typical attic insulation types include cellulose, fiberglass, mineral wood, spray foam, and rigid foam.

### Is spray insulation worth the cost?

The EPA’s Energy Star Association has shown that monthly energy bills can be cut by up to 20% when air leaks are sealed and efficient insulation is installed. The initial cost of spray foam insulation is well worth the investment, when factoring in the overall savings that will be headed your way over the long term.

### How much is a bundle of insulation?

The cost for batt and roll insulation starts at \$0.12 to \$0.16 per square foot for a three-and-a-half-inch barrier that provides a value of R-11. The cost of a single roll of reflective insulation varies according to its R-value.

### Can you put new insulation over old?

According to ENERGY STAR®, you can put new insulation over old insulation, “unless it is wet. 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.

### What is the best blown in insulation?

The best insulation options for an attic are open cell spray foam, fiberglass, and cellulose. Cellulose is the oldest insulation material used for not only the attic, but other areas of the home as well. Fiberglass is another traditional insulation material that consists of extremely fine glass fibers.