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Not knowing the age/size/configuration of your Plumbing or it's condition, I can only suggest what might be causes for your situation.

. Your pipes are old and the interior of the pipes have become narrowed by rust or corrosion.(over time sediments collect on the interior of your pipes and severely restrict the flow(volume). The older the plumbing the more chance this has happened)

. Your water supply pressure is too low. . A restiction in the shower head/diverter. . Corroded valves in the shower.(not fully opening) . Supply lines are to small to handle all the fixtures at one time. . Main supply line valve not open all the way. There is a multitude of things that could cause this situation.

Start by:

.Taking off the showerhead. Turn on the valves, hot and cold, test one at a time, and see it there is sufficient water coming to the shower when the valves(upstairs and downstairs) are both open. This will identify if there is enough water coming up to the shower and if it is just in one side.(hot or cold)

If there is sufficient water flow: Clean or replace the shower head.

If not: . Check the sink/toilet water flow and see if they slow or stop running when the downstairs shower is running. If they too slow considerably, it is probably a problem common to the supply line to the upstairs. . Check your water lines(hot or cold) feeding the upstairs shower to see if it is large enough and tied into a line large enough to carry the demand.

You can also:

. Test the water pressure as near to the Main suppy line as possible.(outside hose bib) You can get a gauge to screw onto a hose nozzle for a few dollars at the hardware store.

Unless you have a Water Pressure regulator in line with the Main Valve, the water pressure should be the same at all outlets.

If you do have a regulator, the "presuure"(not volume) may be reduced after the Regulator but shold still be at a new equal pressure throughout the house. note:(Water Pressure Regulators help protect your fixtures from excessive pressure and surges. High pressure could cause leaks or failure of some units.)

The gauge may help you identify where a restriction may be located.

If the upstairs shower was added during a remodel, it's possible the supply lines were not properly designed to handle the extra water demand. This would require some plumbing renovation to bring it up to specs.

As a general note: Old 3/4" galvanized pipes after time can restrict down to pencil size or smaller inside. Even plug off completely. You know what that will mean...

Good Luck.

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13y ago

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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.


How much does a shower plumbing cost?

"Shower plumbing will vary greatly in cost depending on wether you are installing a new shower system, refurbishing an older system, planning to add upgraded features and fixtures, and if there will be tiling involved."


Is a shower head an appliance?

A shower head is not typically classified as an appliance; rather, it is considered a fixture or plumbing accessory. Appliances are usually electrical devices designed for specific tasks, such as washing clothes or cooking. Shower heads, while functional and essential for bathing, do not fit this definition as they do not operate independently or require electricity. Instead, they are part of a larger plumbing system.


What causes one bathroom upstairs to have very little water pressure in the shower and bathtub but the other bathroom has plenty?

Insufficient water pressure or incorrect pipe sizing


Why does your shower leak once the toilet is flushed?

The drains for the shower, toilet and sink all connect to a common line. Assuming the toilet is not backing up, the problem indicates that there may be a partial blockage, enough so that some of the toilet flow is backing up through the shower drain line. You need plumbing repair. The shower leak you mention should only be in the shower, or else you have a broken drain line as well.

Related Questions

What kind of drainage do you need for a downstairs shower?

Same as upstairs BUT LESS drainage piping BUT more vent piping.


Why does downstairs shower drip but ONLY when the upstairs shower is used?

the pies are connected so when you turn on the shower the vaulve in the pipe going to the other shower might not be all the way closed thus causing it to leak


What would cause the upstairs bathrooms to leak downstairs?

Gravity. Also- If someone takes a shower with the curtain on the outside of the tub this can happen.


Why does your upstairs toilet and drains gurgle and back up when your down stairs shower and toilet work just fine?

The drain is plugged somewhat between the upstairs and downstairs. Need to snake the drains.


What is the cause of downstairs shower and floor draining backing up?

The main drain is plugged. Not completely, but enough that it is easier for the upstairs water to come out in the shower and floor drain instead of going out the drain.


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.


Is the upstairs shower leaking through the ceiling?

Yes, the upstairs shower is leaking through the ceiling.


What is the definition of shower plumbing?

Shower is water that is sprayed over someone. Plumbing is the fixtures and piping that supplies water in a building. Shower plumbing would be the fixtures that spray water in a bathtub/shower stall.


Where does upstairs sink water and shower water drain to?

There is a main drain that runs from the basement through the roof where it is the vent for the system. If you look at the layout of the house, the upstairs bath is most likely over the downstairs one or the kitchen. If you look on the roof, you will see a 4 inch pipe coming through the roof that should be over the upstairs bath. The sink and shower drain into that and then to the basement and out of the house. Most likely the main stack is in the wall behind the toilet.


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How can you diagnose and repair a problem with pipes in the wall that bang downstairs when an upstairs shower is used in a 1982 townhouse?

You have air in the system you need to bleed it out. do you have a really old heater/ boiler. hot water heater need more info


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Your toilet may be bubbling when the shower is running because there is a blockage in the plumbing system that is causing air to get trapped and create pressure, leading to the bubbling effect. This can be a sign of a clog or ventilation issue that needs to be addressed by a plumber.