[ercconst]

Question:
Why is it necessary to have a vent for sink and toilet

Ed

[speedball1]

Good question ED,
Every fixture that has a trap MUST be bvented. On a two bath house, as a rule you have three vents. One each on a bathroom lavatory that vents the group, and a kitchen sink vent. If you have a laundry room that could be another vent. Sometimes we tie them all togather in the attic so that we only have one pipe coming out the roof. This is called reventing. It is possible that a bulder will terminate the vents in the attic. A vent that does not terminate through the roof is called a local vent. There is only one way to prevent sewer gas fron escaping from a local vent that terminates inside a wall. This is a mechanical vent that is spring loaded so that it lets air in to vent but stops sewer gas from getting out. This vent is called a Studor Vent. A plumbing drainage system has traps on each fixture. These traps keep sewer gas from escaping into your house. On a unvented system the water draining sets up a suction that syphons the water out of the trap letting sewer gas out into your house. I have tried to explain how vents work and the different kinds. You asked how important venting is. Vents are necessary for a plumbing system to function. Regards, Tom

[ballengerb1]

If you take a full soda bottle and turn it upside down with the cap off you'll see why a vent is needed. This is how your toilet and sinks would drain with no vent. If you need to add a vent to a sink its pretty easy and cheap, about $28. Venting toilets and tubs is more complicated, which two need vents?

[ercconst]

If you take a full soda bottle and turn it upside down with the cap off you'll see why a vent is needed. This is how your toilet and sinks would drain with no vent. If you need to add a vent to a sink its pretty easy and cheap, about $28. Venting toilets and tubs is more complicated, which two need vents?

THank you that is a great way to explan the problem
ercconst