Elite QandA


Is it better to remove old attic insulation before adding new?


  1. Is it better to remove old attic insulation before adding new?
  2. Is it worth replacing old insulation?
  3. How do you get rid of old blown in insulation?
  4. Can you lay new roof insulation over old?
  5. How long does blown in attic insulation last?
  6. Can you reuse blown in insulation?
  7. How long does blown insulation last?
  8. How often should you replace blown in insulation?
  9. How can you tell if old insulation has asbestos?
  10. Can you reuse blown-in insulation?
  11. Can you put fiberglass insulation over blown-in insulation?
  12. How often should you replace blown-in insulation?
  13. How do I know if my attic insulation has asbestos?
  14. How do you redistribute blown in insulation?
  15. Will blown insulation mold?
  16. Can blown in insulation be removed?
  17. Is it worth replacing attic insulation?
  18. Can you insulate over old insulation?
  19. What happens if you breathe in asbestos once?
  20. Does blown in insulation contain asbestos?
  21. Can you put 2 layers of insulation in attic?
  22. Can you put too much insulation in an attic?
  23. Can you reuse loose insulation?
  24. How do I redistribute my attic insulation?
  25. Can black mold grow in insulation?
  26. How much does it cost to remove old insulation?
  27. What type of insulation was used in 1970?
  28. Will a mask protect you from asbestos?
  29. How long does asbestos stay in air?
  30. How thick should blown attic insulation be?
  31. How many bags of blown insulation do I need?

Is it better to remove old attic insulation before adding new?

Expert contractors that specialize in insulation advise that removing old fiberglass insulation is best before installing new cellulose insulation because of possible mildew, mold, or rodent excrement. So, by have attic insulation removal service, you are getting rid of those possible issues.

Is it worth replacing old insulation?

Unless 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 do you get rid of old blown in insulation?

2:286:12How to Remove Old Insulation From the Attic - YouTubeYouTubeStart of suggested clipEnd of suggested clipUsing you know just a regular old shovel. And a big bigger than a contractor's bag at the accessMoreUsing you know just a regular old shovel. And a big bigger than a contractor's bag at the access home filling it that way or finding a rather large vacuum. I know you can get the removal bags online.

Can you lay new roof insulation over old?

Many specialists will install new installation on top of the old and they will try to lay it crossways, if the old insulation is to joist depth. That way they will cover any holes or gaps that there may have been in the old insulation. This gives you more insulation and therefore less heat lost!

How long does blown in attic insulation last?

20-30 yearsHow Long Does Blown in Attic Insulation Last? Regardless of what kind of insulation you choose, blown insulation is a permanent solution. Cellulose insulation lasts 20-30 years because it is made from recycled natural materials, whereas fiberglass materials will last much longer because it does not degrade.

Can you reuse blown in insulation?

Cellulose: This insulation material is largely comprised of recycled materials already, and it's an excellent option for reusable blown-in insulation in the home. Insulation professionals can completely recover and reuse cellulose for continued use to help save money on your insulation needs.

How long does blown insulation last?

How Long Does Blown in Attic Insulation Last? Regardless of what kind of insulation you choose, blown insulation is a permanent solution. Cellulose insulation lasts 20-30 years because it is made from recycled natural materials, whereas fiberglass materials will last much longer because it does not degrade.

How often should you replace blown in insulation?

After about 15 years, homeowners should consider replacing attic insulation in Northern California. Some folks may need to replace their insulation sooner than that, though.

How can you tell if old insulation has asbestos?

In general, any insulated part of your home could potentially be hosting asbestos-containing material. Therefore, when looking for and trying to identify asbestos insulation, check the areas that are the most vulnerable to heat transfer. That's where you'll find insulation material, which may contain asbestos.

Can you reuse blown-in insulation?

Cellulose: This insulation material is largely comprised of recycled materials already, and it's an excellent option for reusable blown-in insulation in the home. Insulation professionals can completely recover and reuse cellulose for continued use to help save money on your insulation needs.

Can you put fiberglass insulation over blown-in insulation?

A: There's no problem with installing fiberglass batts over your existing blown-in insulation. The only thing you want to make sure of is that you use "unfaced" insulation, meaning it doesn't have a paper or aluminum foil facing on the batts.

How often should you replace blown-in insulation?

After about 15 years, homeowners should consider replacing attic insulation in Northern California. Some folks may need to replace their insulation sooner than that, though.

How do I know if my attic insulation has asbestos?

In general, any insulated part of your home could potentially be hosting asbestos-containing material. Therefore, when looking for and trying to identify asbestos insulation, check the areas that are the most vulnerable to heat transfer. That's where you'll find insulation material, which may contain asbestos.

How do you redistribute blown in insulation?

1:212:45How to Spread Insulation by Hand - Loose fill - Blow in - YouTubeYouTube

Will blown insulation mold?

Two things happen when cellulose insulation gets wet: Mold growth sets in: Thanks to its chemical treatment, mold doesn't grow on cellulose insulation. However, water-soaked fibers sit right against wood studs and drywall, which are susceptible to mold growth.

Can blown in insulation be removed?

Remove Old Insulation. Once there is no asbestos, mold, or rodents, it is generally safe to proceed with attic insulation removal yourself. Luckily homeowners are more likely to find the easier kind which is blown-in fiberglass or cellulose insulation. Removing rolls or batting is a bit harder, but can be done.

Is it worth replacing attic insulation?

Standard insulation starts to degrade and start peeling from walls after about 15 years. Insulation should also be replaced, in some cases sooner than 15 years, if it is no longer doing its job properly. You'll know it needs to be replaced if there are insulation leaks or if it is peeling from the walls.

Can you insulate over old insulation?

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 happens if you breathe in asbestos once?

If you breathe asbestos fibers, you may increase the risk of several serious diseases, including asbestosis, mesothelioma and lung cancer. Asbestos exposure may increase your risk for cancers of the digestive system, including colon cancer.

Does blown in insulation contain asbestos?

They don't always contain asbestos, and some types are much more likely than others to pose a risk. Some insulation materials — including fiberglass, cellulose, and mineral wool — rarely contain hazardous mineral. Others, especially vermiculite insulation, almost always contain asbestos.

Can you put 2 layers of insulation in attic?

You should install two layers of insulation in your attic, wood joists must be covered to allow the air to move. The first layer will sit between the joists, and the second layer will run perpendicular over the joists. The first layer should have the facing against the drywall to act as a vapor barrier.

Can you put too much insulation in an attic?

It's possible to over-insulate an attic as too much will cause moisture buildup and eventually result in mold. Eventually, adding more insulation leads to diminishing returns in trapping heat as well.

Can you reuse loose insulation?

Cellulose insulation is a material that can be reused. When installed by professionals, cellulose can be completely recovered and reused on site, leaving hardly any excess material to go to waste.

How do I redistribute my attic insulation?

0:152:07The Right Way to Insulate Attics with Blown-in Insulation - YouTubeYouTube

Can black mold grow in insulation?

Technically, mold does not typically grow on the insulation itself. Fiberglass is not a viable food source for mold. Yet mold growth is often found on the top surface of attic insulation.

How much does it cost to remove old insulation?

The estimated cost of removing old insulation is $1 to $2 per square foot. Keep in mind, this is on top of the price of installing your new insulation.

What type of insulation was used in 1970?

One of the most harmful insulation materials, asbestos, continues to cover attic floors in many older homes. Other insulation materials in use in the 1970s include vermiculite, which can also be dangerous, as well as fiberglass and rock wool, which are still in use today.

Will a mask protect you from asbestos?

Not made to stop asbestos A dust mask is great at what it's supposed to do, which is blocking normal dust. However, it is not enough to stop asbestos particles. Wearing a simple mask from Lowe's or Home Depot isn't going to give you the protection you need or ensure that you don't develop mesothelioma.

How long does asbestos stay in air?

The toxic mineral dust can remain in the air for hours, placing anyone nearby in danger of inhaling or ingesting it. In an ideal environment with little disturbances, it may take 48 to 72 hours for asbestos fibers to settle. If the dust is disturbed, it can easily become airborne again because it is so light.

How thick should blown attic insulation be?

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 many bags of blown insulation do I need?

More on Calculating Insulation Needs Divide the measured square footage you obtained by 1,000 square feet to obtain the multiplication factor: 1,500 square feet/1,000 square feet = 1.5. Multiply the R-value chart number to obtain the number of bags (rounding up at the end): 40.8 * 1.5 = 61.2 or 62 bundles.



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