Can You Put New Attic Insulation Over Old?

How do I know if my attic needs more insulation?

If you can see the floor joists – boards about eight inches high spread a few feet apart across the attic floor – you probably need more insulation.

Whether you have batt insulation (fluffy blanket-like material) or loose fill (shredded material), there should be enough to completely cover the joists..

Should I remove old attic insulation before adding new?

According to ENERGY STAR®, you can put new insulation over old insulation, “unless it is wet. … “Faced” insulation should not be placed on top of existing insulation in the attic. Any new roll or batt insulation installed over existing insulation in the attic needs to be without a vapor retarder (face).

How long does it take to remove insulation from attic?

For an attic that’s 1,500 Square Feet attic insulation removal will take approximately 4-6 hours to complete. This is based on a team of 3 attic cleaning technicians with proper equipement and training. For a DIY project in a 1,500 Square Foot attic insulation removal can take between 6-18 hours.

How much does it cost to insulate a 1200 sq ft attic?

How much does attic insulation cost? The pros charge $1,500 to $2,000 to do a 1,200-sq. -ft. house.

How often should you add insulation to your attic?

Depending on the type of insulation, it can last anywhere from 20 to 80 years. Unless your home is decades old, you shouldn’t have to worry about replacing insulation for that reason. Older homes often will need their insulation replaced, simply because the quality of insulation has so greatly improved since the 1970s.

What is the best insulation for the attic?

Loose-fill fiberglass attic insulation still experiences convection, but not nearly as much as old fiberglass used to. 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.

Is attic insulation dangerous?

Respiratory Problems Improper attic insulation can cause chemical off-gassing. This is a situation where the insulating agent releases potentially harmful chemicals into your home via evaporation.

What is the difference between r30 and r38 insulation?

Example: R38 has a U of 1/R or 1/38=. 026 and R30 has a U of 1/30=. 033. So R38 is about 20% better.

Will adding more insulation attic make difference?

According to the Department of Energy, properly insulating the attic can save 10 to 50 percent on a typical heating bill.

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

Attic Insulation CostsItemUnit CostInsulation: 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.$0.64per sq.ft.+ Labor Cost$32per hourTotal Cost$1.00per sq.ft.

Is it better to insulate ceiling or roof?

In order to avoid damage to the roof deck, you should insulate ceilings to create an air barrier between the living space and an unfinished attic or airspace underneath the roof deck.

How many bags of insulation do I need in my attic?

Average Cost of Blown-In Fiberglass InsulationR-ValueBags Per 1,000 Sq. Ft.Installed Thickness (Inches)R-382013R-442314.75R-492616.5R-6032201 more row

Is spray foam worth the money?

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.

Can you put too much insulation in 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.

Is rolled insulation better than blown?

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 I remove attic insulation myself?

How to Remove Blown-In InsulationInspect the Insulation. There are several different types of insulation, so you should first identify the type you have in your attic. … Gather the Right Equipment. … Protect Your Space. … Create Your Workspace. … Set Up Tarp and Trashbags. … Put on Safety Gear. … Vacuum Insulation. … Clean Up.

Can you lay insulation over electrical wires in attic?

It’s caveman simple to install residential attic insulation batts on top of an existing ceiling when you’re in an attic. … Don’t step on any cables or wires in the attic.