It is a galvanized pipe cover with a lead ring on the end to seal around. Wonder if the vent pipe are to high above the roof the sewer gasses . A vent pipe cover protective device for a plumbing vent stack having a. There are suggestions to insulate your pipe right to the roof line and fully. I have the same problem with the plumbing vent pipe freezing up.
ANSWER: Freezing or blockage of plumbing vent terminations above. Insulating the exterior of these pipes, mainly as they progress through . Vent Cap is constructed by sturdy galvanized steel and are available in different. If those pipes in the attic are part of the vent stack that allows sewer gases to be vented above the roof it would be a waste of time to insulate. Description: Insulated sewer ventilation pipe. It is the moist sewer air freezing in the vent.
You may find as state insulating the stack in the section from the ceiling to the roof helps and or cures your problem.
What I find mostly happening is when we get enough snow to cover the roof . Sewer and Water services shall have a minimum of 1. No part of a plumbing system, except a dry vent that is adequately insulated from.