Look also for short plumbing vent stacks above the roof line they can be covered and blocked by snow.
Covered drain vents on roof tops.
The idea of roof vents existed for hundreds of years with natural vents employed in chinese buildings during the tang dynasty natural ventilation ducts in the buddhist monks caves and wind catchers incorporated in arabian architecture.
So you may want to have this job done by someone who has experience working up high.
It is a vertical pipe attached to a drain line and runs through the roof of your home.
Start by trying to clean the roof vent and main drain with a hand held drum auger.
They regulate the air pressure in your system allowing waste to flow freely.
Slow draining and gurgling plumbing fixtures could be a sign of a clogged roof vent.
It channels the exhaust gases to the vent and helps maintain proper atmospheric pressure in the waste system.
Why plumbing air vents are important.
Insert the head into the vent opening and feed it down until you encounter resistance.
My guess is that the underside of the metal cap rapidly became choked with ice as your plumbing vents are normally aspirating moist air when nothing is going down your drain pipes.
Normally those are found on walls and aren t found on roofs.
Crank the handle to work the head through the obstruction.
The vent stack is the pipe leading to the main roof vent.
Bring a 20 foot sewer auger onto the roof.
And on homes that do not have a main drain cleanout accessing a clogged main drain through the roof vent could be your best option.
If they become blocked your system won t drain properly.
Here is a diagnostic guide to types of stains and staining materials found on roof surfaces black red green brown or other coloured stains on asphalt roof shingles or on other roofing materials need first an accurate diagnosis of the stain cause and then proper steps to remove the stain or to prevent future staining on roof shingles surfaces.
If you feel confident about performing the work yourself be sure that the roof is dry wear rubber soled shoes and use a safety harness to prevent yourself from falling off the roof if you slip.
A vent cap that is covering an air vent of some kind is susceptible to water damage.
Vent roofs with steeples towers or cupolas can be found in different buildings from barns to cathedrals.
At some point the ice came in contact with the top of the vent pipe and no air could enter the vent.
Located on the roof these vent pipes allow gases to escape from your sewer system.
Working up on the roof can be a dangerous task to say the least.
Plumbing vents need to be unobstructed.