I have not been involved with the causes for green mold before and now find myself indirectly attached to a house that has it. The parsonage built by the members in 95 was lived in until 07 and then sat empty. 18 months ago we brought a new pastor in to live there. A month ago they were complaining of being sick a lot and they found high levels of green mold in some but not all of the bedrooms. A mold abatement team came in but thought that there is a problem larger and want to call in an engineer to study the problem. Of course the insurance company is involved now so I have been just watching from the sidelines.
The house built in 95, has ladder truss floors, vinyl siding with an asphalt shingle roof. Decent insulation with poly covering the walls before being sheetrocked.There is a Lennox F.A. system, Lennox HRV taking air from the bathrooms and kitchen. While there is some little things that could be fixed on the system that I saw I'm at a loss as to the mold being in weird places. Most of the areas are on outer walls in the corners by the baseboard including the baseboard. Never over 18" froom the floor. It is in the upsairs bedrooms on opposite corners of the house and one bedroom down stairs. There is some in the closet by the front door at the other end of the house, which had it's register closed. The HRV is used on timers for when the bathrooms are used. The A/C was off and the windows open but it did not feel too humid. This was just a walk through, I'll have to go back with my psycometer some time but with the windows open it might not be accurate. It has been raining a lot here in Lake City,MN. They have been running a dehumidifier in the basement.
I think this is a lack of air flow problem but would like input on this as I have not encountered it before, my time now is mainly in refrigeration and teaching of it.
What do you think? I'm not sure an engineer is going to know what to do.