I'm suspicious of my vent stack. When we have winds blowing from a South Easterly direction our house starts to smell of a musty, moldy type odour. I've check all the plumping in attic and made sure everything was clear and connected. Couldn't find any poor connections.
The house was built in 1998. I live in Southern Ontario not far from Detroit, Michigan.
We have two vent stack on the house. But it's usally only the East side of house that starts to get the odour.
My question's are, should the stack be capped? Its just straight up and how high should a stack be compared to the roof line? Or should it be above the top of the roof? Its only 14" above the roof. Lastly could I pour bleach or something down it to curb the odour?