Are black spots on the underside of roof sheathing mold
attic
There is black spots identified in our attic which we are trying to gauge if this is mold.
Best Answer
Yes it is mold , don’t panic all wood has mold spores.
Most of the spores are not hazardous the only way to know is by testing.
If you want to kill the mold bleach water OR hydrogen peroxide and water 3% both will kill surface mold. I prefer hydrogen peroxide as it doesn’t stink.
Keeping the attic well vented really helps to stop mold growth but a few spots like you have is quite normal,
Why don’t you see mold in the lumber yard? After wood is finished it is sprayed with a fungicide that stops mold growth for a couple of months, kiln dried has the moisture removed so it doesn’t get the treatment.
I tried to cover common issues as some folks are panicked by the word mold when most of the time it is harmless and has been there for years, if new may indicate a roof leak or moisture source in the attic space.
The Illinois DPH site related to mold, which does not specifically license remediation firms.. They also don't do inspections. They DO list several internet sites for contractors:
It might be a pertinent question to ask: "Do you follow the EPA guidelines for remediation?".
A basic tool for your own use, a moisture gauge, will tell you if the area is ready for treatment: Wooden interior framing should be < 15% moisture content. One reasonably accurate meter (non-contact) is the Ryobi E49MM01.
Best Answer
Yes it is mold , don’t panic all wood has mold spores. Most of the spores are not hazardous the only way to know is by testing. If you want to kill the mold bleach water OR hydrogen peroxide and water 3% both will kill surface mold. I prefer hydrogen peroxide as it doesn’t stink. Keeping the attic well vented really helps to stop mold growth but a few spots like you have is quite normal, Why don’t you see mold in the lumber yard? After wood is finished it is sprayed with a fungicide that stops mold growth for a couple of months, kiln dried has the moisture removed so it doesn’t get the treatment. I tried to cover common issues as some folks are panicked by the word mold when most of the time it is harmless and has been there for years, if new may indicate a roof leak or moisture source in the attic space.