If you have no other vents in the house and this is the only vent going through the roof the last t the upper most one before exiting the roof needs to be a 3 x 2 x 2 t and not a 2 with an increaser reducer after it.
Sanitary t in attic.
Possums and raccoons leave behind much more waste than rats.
I have a customer that we are doing some work in the attic for and i noticed yesterday that the plumbing is vented up into the attic phew and not thru the roof.
If you work carefully you won t disturb the roof flashing.
Still it s a good idea to spray the flashing area on your roof with a garden hose.
There are 3 vents in one area and 2 in another.
Although our prices for attic cleaning and decontamination are very competitive several factors determine how extensive the damage is including the layout of your attic the length of the infestation how many rodents occupied your attic and the type of rodent.
Because they need water daily they tend to nest where water is readily accessible.
Then check the attic to make sure there are no other leaks.
Or in many cases it can tee into the home s existing venting system.
The best way to get rid of rats and mice is to use the classic wooden snap traps or bait traps.
Studor aavs installed in attic area must be located a minimum of six 6 inches above the ceiling insulation.
I see situations around like this sometimes.
You ll probably have to go to a plumbing supply store to find the 3 in to 4 in.
Roof rats aka black rats often build nests in attics.
Then this vent can terminate through the roof all on its own.
Only two plumbing set ups could require sewer pipes in the attic.
In the ipc use a 1 5 sanitary tee upside down or in the upc use a 2 x2 x1 5 san tee upside down to make this connection.
This will help remove dust and dirt which has inevitably collected over the years.
The first would be a bathroom or kitchen in that part of the house and the other would be a pressurized drain system with pipes.
Another important thing about plumbing vents.