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Old 09-09-2019, 10:57 AM   #1
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Attic Insulation after testing attic for mold


I have a question about insulating my attic + air-sealing and attic maintenance after finding elevated mold spores in the attic.

First, some background info: the house is in Michigan (near Detroit), built in 1964. This year (2019) I've done a mold test using an air sample, and results came back as such:

Spore estimate count per cubic meter:
chaetomium 200
stachybotrys 50
penicillium/aspergillus 1500

Looking at the mold test results I wondered if I need to clean out my attic, remove old insulation, and reinsulate the attic.

When I went up into the attic I've discovered that it is very dusty and poorly insulated. I am currently at R11-13 (estimated). I am also concerned about mold.

I saw signs of water damage stains on some walls and attic drywall flooring. At one time several years ago the pump on the SpacePak blower coil unit failed, leaking through the drywall ceiling. That has been repaired.

Attic is vented with vent caps, but there are no soffit vents and no baffles.

I have a few questions in no particular order:
  • Do I need to remove my old insulation (due to mold)?
  • Do I need to remove my old insulation (due to all the dust & debris in my attic)
  • What is my current insulation?
  • Do I need to add more insulation? What kind?
  • Do I need to add baffles? Do I need soffit vents?
  • Do I need a radiant barrier?
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Attic Insulation after testing attic for mold-dsc00778.jpg  

Last edited by dennismv; 09-09-2019 at 11:11 AM.
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Old 09-09-2019, 11:18 AM   #2
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Re: Attic Insulation after testing attic for mold


Did you do the air test out in the yard too, so you would know what you are dealing with. Mold spores are everywhere, they need moisture and food, if you can't find any growing you are likely in good shape. Can you add soffet vents?
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Old 09-09-2019, 11:47 AM   #3
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Yes, outdoor test only had 820 the of Penicillium/Aspergillus Group spores, and none of the other kind.

I haven't seen any actual mold growing in the attic but I haven't looked everywhere. I could probably add soffit vents although I never have done that before and will need to do some research.
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