Got a call from a women. She complained about water and ice on her inside walls. Townhouse with the living area above the garage.
- Chimeny chase not insulated at all
- Interior wall, over entry stairway
- Corner of master bedoom
- Side wall of master bedroom
Ice forming on inside walls and at baseboard. Temp outside was 16F. Inside temp was about 72F (away from the walls). Furnace was going gangbusters. All the these places coincided with either inside or outside corners. Exterior siding metal. Window penetrations not taped.
No house wrap. Open duct from attic to utility closet (for combustion air, I suppose. Cat 1 furnace and clothes dryer in the utility room, along with conventionally vented water heater. This duct was closed off “because it was cold”.
I am calling lack of vaopr barrier and improper sealing of sheathing, along with negative interior pressure, drawing cold air into the house. Moisture readings were OK (except where ice was forming). Interior humidity was 45%.
I think that the cold air, behind the walls (and I could feel it, coming up under the base molding at the bedroom corner) was making the drywall and base so cold that the indoor humidity was just freezing.
Feel free to use.