I have 3 bathrooms in my house one in the basement and two on upper floors.
Just the basement one empties with force. The upper two are on emply
slowly, no downward vacuum.
My question is this: can the venting be casusing this problem. If so is it
possible to check this without going up on the roof. My house has a terra
cotta tile roof and 14/12 pitch. The tiles are just plopped on the roof so
walking on this surface is asking for disaster. Any informed suggestions?