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The most common is 3" or 4" depending on the # of toilets in th home.

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Q: What is the most common size for the main house sewer drain?
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What size main sewer line is required to have 3 toilets in a house?

3" house (building) drain allowable. 4" building sewer line needed for house from sewer main.


Hwy when you flush your upstairs toilet does your downstairs shower drain erupt sewage?

The drain from the toilet to the main drain is plugged and the branch to the shower is not. If the main floor toilet flushes, it is between the two toilets and not between the house and the sewer.


What is the recommended drop in elevation for a main sewer line in a house for it to drain properly?

Anytime I have plummbed a house, I always start on the far end of the drain system and slowly drop the grade as I work my way to the main drain. Just always remember sh!t rolls downhill. goodluck


Your sewer outlet is lower than the main sewer lines what are your options?

A little more detail about the sitsuation would help. New construction, remodel, sewer outlet in the house to street or sewer outlet in house to main going out of house.


Why would both toilets in the house be overflowing when flushed?

The drain pipe has a blockage somewhere downstream from where the toilets are connected to the main sewer line from the house. All the drains in a house normally connect to one main line that either goes to the city sewer system or your septic tank. If you know where the sewer line exits the house, you could check there to see if the blockage is in the yard. Most sewer blockages are caused by tree roots, broken fittings, or crushed pipes. Good Luck


Where does the water in the washer drain to?

It goes into the main sewer system. It will go through your sewer system and then out to the main sewer. That is if you live in town!


Are cast iron sewer lines 4 inches?

4" is the standard house sewer main


How much does it cost to have a plumber snake a main drain?

Drain under the sink or main to the city sewer? It depends on how long a plumber is there. $50 to $250.


Sewer smell in the basement when it rains?

Could be caused by a couple of things. If you have an onsite septic system (tank and drain field) the tank may be full, and the rainwater is causing it's contents to backup the main drain back in to the house. A vent pipe could be plugged, which causes the sewer gas to back up. If you are hooked to a public sewer, there may be a blockage in the main drain out to the line in the street. Have a plumbing contractor check it out. It can be very dangerous.


Who owns a drain connection between the property boundary and the main sewer?

The property owner is totally responsible


You want to install shower in the basement tying into the main drain for the house should there be some kind of backflow preventer installed between the shower trap and the main line to prevent backup?

If the existing sewer line is lower than basement grade (does it go into the basement floor and out of the house?) you can just connect in to the existing drain. By code, sewer lines must have a slope of 1/4 inch per running foot, meaning that raw sewage will run AWAY from the main plumbing stack of the house. If the sewer line is ABOVE the level of the basement plumbing fixtures, you will need to purchase and install a pump check-valve, and tank to install any plumbing below the house sewer line. If you have any questions, contact a licensed plumber to find out the needs of your home.


How do you splice PCV piping on a Cast Iron main drain at sewer end?

A rubber Fernco or Clamp All