Yes. And you should.
Do ensure that the vent pipe is of adequate diameter (generally 3"-4" for a combined-fixture gable vent), turns upward to travel adequately above the roofline (generally 18" is accepted) and that the pipe itself is both adequately secured to withstand physical forces acting upon it and protected from potential ultraviolet degradation. In areas with freezing temperatures, significant rains, or snowfall, other measures might be taken to ensure that condensation and water do not restrict the airway, such as ensuring a neutral or slightly positive slope of the horizontal runs.
Vent through roof
You should not have to clean a vent on the roof. unless you are trying to clean the waste line to the fixture below. Then you would send plumbing rods through the vent on the roof.
In plumbing the roof vent should be a min of 4" to prevent hoarfrost
Yes. The roof vent is usally located on the roof. If the vent is clogged, it can create numerous issues and prevent your plumbing system from working properly.
I don't quite get what you mean. -A vent pipe in a plumbing system is usually 1 1/2 inch ABS pipe and may extend through the roof, or may end in a AAV under a countertop.
Plumbing vent pipe is installed through a cathedral ceiling and metal roof surface there is no easy access into the roof cavity. In an attic after cut off the elbow whose female end contained the remains of the ABS pipe, glued on a short extension and new elbow in the attic, and glued a new plumbing vent rooftop riser into the new elbow. For more information visit at: alliedallcityinc.com
Yes BUT not an outside wall
The alternative to a plumbing roof vent is an AAV. This is an Air Admittance Valve, a simple spring loaded ABS fitting that serves exactly the same function as a roof vent, except that it does not penetrate the roofing. I used 4 of these while re-plumbing my mobile home, three under countertops and one in the wall behind toilet. I'm very happy with their performance and even happier at having less holes in the roof.
No plumbing code allows a loop in a vent line. They must be pitched just like a drain line as there are many conditions where water can be in a vent line, such as rain through a roof vent and condensation. If the "u" were to fill with water it would no longer function as a vent.
4 " vent to prevent hoarfrost and pitch pocket around the pipe filled with bituminous material 4 " vent to prevent hoarfrost and pitch pocket around the pipe filled with bituminous material
A roof vent can be blocked by hoar frost and to illimate this phonimia you need to increase the vent terminal to 4" If a vent terminal is blocked by leaves or other soft debris the water jetting is one of the best ways to clear it
By removing foul sewer fumes and venting them to the outside air nomally through the vent terminal knowing warm air rises