September 25, 2011 at 11:17 am
We live in Northern MN and our vent pipes were also freezing in the winter. We have a newer home and the vent pipes were slightly below the roof line. We painted the vent pipe black, that did not solve the problem so we extended the vent pipe above the roof line.
The vent pipes still froze-we have 2 vents. We went to L&M and found a black plastic boot type thing that fits over the vent pipe. It is black and the middle of this boot rests at the top of the vent pipe.
This boot, directly above the top of the vent pipe, has about three holes and there is an insulating Styrofoam inside the bottom half of this boot. The part of the plastic boot that is above the vent pipe is aprox 10 inches long and the part below the top of the vent pipe is aprox 10 inches long. This seems to help but we have to watch so the snow does not pile up and cover these three wholes on the top half of the boot.
A plumber also suggested we check the insulation around the vent pipe within the attic area. We have a lot of insulation so this could not be the problem. The vents are PVC and bout 4 inches in diameter.
I don’t understand how these pipes could freeze, prior to the use of the boot, do you have any ideas?