Many homes have the right amount of insulation, but too many homes don’t have enough. Do you think this could be the case for your house (and a professional can help with this)?
If it turns out you need more insulation, the next question you may have is “can new insulation be added over old layers, or should I remove and replace it?” Contact us to start your project, or keep reading to learn more about adding insulation on top of old layers!
Can I Add New Insulation Over Existing Layers?
According to ENERGY STAR®, you can put new insulation over old insulation, “unless it is wet. If it is wet or appears that the insulation has previously been wet, you should look for the cause and repair the problem…” Wet insulation is problematic, as it can lead to mold, mildew and sometimes the rotting of ceilings or roof rafters.
Although insulation professionals will handle the installation for you, here are some things to keep in mind about removing old insulation and installing new insulation over old insulation, according to ENERGY STAR:
- “Faced” insulation should not be placed on top of existing insulation in the attic. Any new batt or roll 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. Any existing batt or roll insulation in the attic should have the facing against the attic drywall floor or no facing at all.
- Batt or rolled insulation or blown loose-fill insulation (fiberglass or cellulose) can be installed on top of old insulation.
- Insulation should be rolled out perpendicular to the joists—and unfaced rolls should be used.
- Rolled insulation should not be tacked down. The R-value can be reduced if the insulation is squashed or flattened.
- Any vermiculite insulation found in your attic should be tested. If the test reveals that asbestos is present, the vermiculite should be removed by a certified professional before installing more insulation.
- It’s recommended to air seal before installing insulation since air leaks can hinder the performance of insulation and significantly reduce the energy efficiency and comfort of your home.
The most important thing to keep in mind is that you don’t have to worry about all this. Insulation professionals will be able to answer any questions you have about putting new insulation on top of existing insulation—and handle the entire project.
If you live in Tacoma, Washington or a surrounding area, look to the team at Pacific Partners Insulation South. We have experience installing all types of insulation and can help you with your project. Contact us today to learn more about our services or if you’re ready for a quote!
