Quick Answer: Can You Put Too Much Insulation In Your Attic?

What are the disadvantages of insulation?

No type of insulation completely stops heat transfer and fiberglass has other drawbacks, as well.Coverage Issues.

Fiberglass batts are available in precut widths of 16 inches or 24 inches.

Air Exchange Issues.

Moisture Issues.

Mold Issues..

Is there such thing as too much insulation in the attic?

There’s really no such thing as “too much insulation.” It is more likely that your attic is not ventilating properly, resulting in warmer air on the 2nd floor and an overheated attic. … Lots of attic insulation will keep the 2nd floor temperature from changing quickly.

How often should you add insulation to your attic?

Most experts, including those at the U.S. Department of Energy, recommend that you have you insulation inspected at least once a year. If your roof has had to be repaired or replaced because of leaks, you should definitely make sure to have an attic insulation inspection.

Can you lay insulation over electrical wires in attic?

If you use batts, just roll those out according to the instructions on the packaging. 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.

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.

Is it worth adding more insulation to my attic?

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 in too much insulation?

It is possible to over-insulate your house so much that it can’t breathe. The whole point of home insulation is to tightly seal your home’s interior. But if it becomes too tightly sealed with too many layers of insulation, moisture can get trapped inside those layers.

Is it better to insulate attic ceiling or floor?

1 Answer. Since the ceiling in the attic is too low to make it into a living space, you should only insulate the floor. Insulating the ceiling will create a new heating zone, and essentially you will be paying more to heat your attic.

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. … Any new roll or batt insulation installed over existing insulation in the attic needs to be without a vapor retarder (face). The vapor retarder on top of or between layers of insulation can trap moisture.

How long does insulation last in the attic?

80 to 100 yearsUnless damaged, it can last 80 to 100 years in most houses before it needs to be replaced. However, insulation can start falling from fiberglass batts after 15 to 20 years, so if your insulation was installed in batts well over a decade ago, it might be time for an inspection or a home energy audit.

How many inches of insulation should be in my 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.

Can I put new insulation on top of old?

Yes! You can absolutely new insulation over old insulation… as long as it isn’t wet. … Wet insulation can lead to mold, mildew, or even the rotting of your ceiling or roof rafters.” In fact, you can add new insulation over the existing installation in other areas of your home, not just the attic.

What is the best insulation for an 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.

How do I know if my attic needs more insulation?

A quick way to see if you need more insulation is to look across your attic floor. If your insulation level is at or below the top of the floor joists, you probably need to add more insulation (but remember to seal the air leaks before you insulate).

Can you put too much blown 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.

Is it better to insulate ceiling or roof?

Saving energy costs by preventing heat loss due to heat conduction. Preventing the roof from accumulating moisture damage. Ease of construction- insulating the ceiling can be easier than insulating the roof, particularly with older homes.