All you have to do is hire a licensed master plumber and have her install a pressure /temperature balanced shower body made by Delta
OrRepipe the potable water system and increase the C/W riser and branch lines to have less pressure drop and loss of volumeYes, remove your old shower valve and fit a new Moen anti-scald valve. This will not change when other items are turned on.
There is a clog between the sink and the line to the street or septic tank. The sink is the easier path for the upstairs shower.
The shower valve needs to be repaired! As for the water not shutting off when you turned off the main that is also needing replacement when it shut of by turning on other faucets you were simply diverting the flow from the leaking main shut off.
you are not straight if you get turned on by men (and you are a man), by definition
he suddenly turned up (to appear, emarge)
The shower is turned off but the water is still running because there may be a leak in the faucet or showerhead, causing water to continue flowing even when the shower is not in use.
the shower might be turned the wrong way so they can't use it or something could be blocking the shower the path to the shower.
Its a loss in water pressure to the shower.
What happens after one pulls out their kitchen sink depends on what one did or didn't do prior to pulling out their kitchen sink. Not turning off the water supply to the sink prior to removal would likely lead to water being sprayed everywhere. Turning the water supply off, but not turning on the tap prior to sink removal, would likely lead to the remaining water draining out of the free end of the pipe. If the water supply was turned off and the remaining water in the lines drained, then the faucet can be removed safely removed.
The shower head drips because of a faulty seal or worn-out washer that fails to completely stop the flow of water when the shower is turned off.
Your tub faucet may be leaking when the shower is turned on due to a faulty diverter valve. This valve directs water flow between the tub faucet and the showerhead, and if it is not working properly, water may leak out of the faucet when the shower is in use.
Water may continue to flow from the shower head after it is turned off due to a faulty valve or seal that is not fully closing, allowing water to leak through. This can result in water dripping or flowing out even when the shower is not in use.