Does your home need more insulation? Looking to improve your home’s cooling and heating efficiency? If you’re wondering whether or not it’s okay to install a new layer of insulation over existing insulation, check out our guidelines below.
When to Add New Insulation Over Old Insulation
As long as the old insulation is in good condition and shows no evidence of exposure to moisture or wetness, you can add new insulation over existing insulation. Here are some tips for installing the new insulation over existing insulation:
· Faced insulation should not be placed on top of existing attic insulation. Any new batt or roll insulation that is going to be added on top of existing attic insulation needs to be without a vapor retarder (face). The presence of a vapor retarder between layers of insulation can trap moisture that could lead to mold. Any existing batt or roll insulation in the attic should have the facing (vapor retarder) against the attic drywall or no facing at all.
- Only use batt, rolled or blown loose-fill insulation (fiberglass or cellulose) on top of the old insulation.
- If you are installing rolled insulation, make sure to install it perpendicular to the old insulation. Be sure to use un-faced rolls.
- Avoid taking down the new insulation.
- If you discover vermiculite insulation, make sure to have it tested for asbestos and removed if it is found.
When to Remove Old Insulation Before Adding New Insulation
- Old insulation should be removed before new insulation can be installed when:
- Old insulation is wet, has been wet, or appears like it has been wet in the past.
- Evidence of mold is present; the mold should be cleaned before new insulation is installed. The cause of the mold or moisture should be identified and repaired and affected insulation removed.
ASAP Heating and Cooling serves customers in the in the Ft. Myers and Cape Coral, FL areas. Please feel free to contact us at 239-217-4148 with any questions you may have regarding the addition of new insulation in your home.