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Our log home is 30 years old. I noticed that below and air conditioner there was a sizable amount of a white/yellow foam seeping from a small hole in a log. It had the stickiness and consistency of spray foam before it dries. Outside were two tiny, oval-shaped holes two logs below the log with the inside seepage. There are no signs of dry powder on the outside or inside. Is this an insect, a fungus, or something else?


Sounds like mold from moisture from the air conditioner or rain splash off from the air conditioner.

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