Is It Better To Insulate Attic Ceiling Or Floor?

Should I remove old attic insulation before adding new?

Unless the old attic insulation is wet, new insulation can be installed over old insulation.

Any wetness will get trapped between the old and new it will mildew, mold and rot the attic floor and rafters..

How many inches of insulation should be in my attic?

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.

How much does it cost to insulate a 1500 sq ft house?

Cost: Blown-in insulation is perfect for the weekend warrior looking to get the job done cheaply. There is little learning curve involved with the application, and a DIY job will cost you about $500. Calling in the pros, on the other hand, will run you about $1,500 to $2,000 for an average 1500 square foot home.

Can I put new insulation over old?

If the existing insulation is in reasonable condition (dry and no rodents in it) it can often remain in place and is simply covered with a new additional layer.

What is better for attic insulation?

If you check with the North American Insulation Manufacturers Association, they’ll assure you that fiberglass or mineral wool is definitely your best choice for attic insulation.

Which is better attic insulation blown or rolled?

Rolled fiberglass insulation scores an R-value of 3.7. So overall, rolled fiberglass insulation is slightly more effective at blocking in and out heat than its blown counterpart.

How do you tell if your attic is properly insulated?

If you notice that your energy costs are higher than usual, it is wise to get the insulation inspected by a professional roofing company. If you find that a few of the rooms in your house are colder than the others, or if the ceiling and interior walls are cool when you touch them, it is a sign of improper insulation.

How much does it cost to insulate a 1000 sq ft attic?

Blown-In Attic Insulation Costs The cost to insulate an attic with blown-in insulation runs from $600 to $1,200, assuming it is 1,000 square feet in size. If you choose to hire a professional, expect to pay from $40 to $70 an hour for labor in addition to the cost of materials.

What is the cheapest attic insulation?

Rolled fiberglass or rock wool insulation, known as batt, is the least expensive form of insulation. Spray foam and foam board are the most expensive forms of insulation and are rarely used for attic space because of the higher cost.

What is the best insulation for an attic ceiling?

Also known as loose-fill, blown-in insulation comes in tiny chunks packaged in large bags, and entails using a blowing machine to fill in necessary spaces. Fiberglass, cotton, and mineral wool can all work as loose-fill material, but the far and away top choice for blown-in insulation is fiberglass.

Should I insulate my attic floor or ceiling?

1. In unfinished attic spaces, insulate between and over the floor joists to seal off living spaces below. If the air distribution is in the attic space, then consider insulating the rafters to move the distribution into the conditioned space.

Is adding insulation to attic worth it?

Installing attic insulation this winter is a worthwhile long-term investment because it can significantly decrease your heating bills. As an added benefit, when the hot D.C. temperatures come back, the attic insulation will also minimize your air conditioning bills.

Can you put too much insulation in your attic?

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 does it cost to insulate a 1500 sq ft attic?

Attic Insulation CostsItemUnit CostCostInsulation: install Kraft faced R-19, 23″ wide x 6.25″ thick x 1,500 sq.ft.; prepare and clean up; including waste and miscellaneous material.$0.64$1,053+ Labor Cost$32$448Total Cost$1.00$1,501

Is attic insulation dangerous?

Improperly disturbing insulation can cause microscopic asbestos fibers to break away and become airborne which is dangerous to anyone in close proximity. The older asbestos is, the more likely it is to degrade with time and once fibers are inhaled it can cause serious health issues.