Jay depending on plumbing vent location above the roof window location and distance below the roof and wind direction site characteristics may be giving you a down draft that sends plumbing vent stack odors down into a nearby window.
Roof vent bad smell.
In the short term your plumber can fix the issue by clearing snow away from the vent and melting any snow that has made its way down inside of the vent.
The vent stack is the pipe that releases all the gases that build up in your septic tank.
One of the main jobs of vent pipes is to get rid of those nasty odors and gasses so if you smell something off it s time to check it out.
These gases are a natural byproduct of the bacteria that break down the waste in either your septic system or sewer line.
This is most likely to occur on a flat roof from which the snow does not drain properly or after a really heavy snowstorm that results in several feet of snow on the roof.
Often wind currents cause these odor problems.
Because of this naturally occurring cycle the septic and sewer gases have a foul odor.
Clear your sense of smell by stepping outside for a few minutes.
If it is close enough to your ducts then the ducts can spread the smell throughout your home.
The plumbing roof vent pipe and yard based sewer vent pipe are also a place where septic gases and sewer gases exit the system safely.
Because of this naturally occurring cycle the septic and sewer gases have a foul odor.
A backed up sewer line or a crack in a plumbing or sewer vent pipe could cause the smell.
Sewer and septic tank odors are a big problem for some homes.
Strong sewage smells are a telltale sign that your toilet vent pipe may be clogged.
The plumbing roof vent and yard based septic vent is also a place where septic gases and sewer gases exit the system safely.
Unfortunately leaves and other fallen debris can get jammed inside and cause odors to be trapped around your house.
Now let s look at the top signs to look for which may mean a vent is clogged.
Stop sewer and septic vent pipe odors with septic solutions activated carbon vent pipe filter.
The stack should send these gases out around your roof so the smells don t affect you.
If you smell raw sewage coming from your vents there is one usual cause.
When you re enter your house follow the offending scent until you reach the area where the smell is the strongest.