Quote:
Originally Posted by opendoor
That's actually a pretty common problem, at least if I'm understanding things correctly. Here are a few threads on a plumbing forum about it:
https://terrylove.com/forums/index.p...-filled.38737/
https://terrylove.com/forums/index.p...er-down.43103/
https://terrylove.com/forums/index.p...is-open.74920/
Basically, the issue is usually too much restriction from the valve to the tub spout, which means water enters the valve faster than it leaves the spout, and it then finds its way up to the shower head. That can be caused by using pex pipe from the valve to the tub (the inside diameter is usually too small to deliver the right volume to a tub spout), some kind of blockage, or something wrong with the tub spout. And theoretically at least, too much water pressure/volume could also cause that. So if that's the most likely issue, you could always put a pressure reducing valve on the main line if it's too high.
I don't think it would be a leaky diverter valve as mentioned above; that would normally cause the opposite problem (water coming out the tub spout when you're showering). In the standard shower/bath valve setup, the only thing really keeping water from coming out the shower head when filling the tub is gravity and lack of pressure due to tub spout's flow; the valve doesn't really come into play. |
It is probably using Pex to the tub spout, but I am wondering if this will be a problem in the future and if I should bother to rectify it? I think the only way I could fix it properly would be to go in through the wall behind the bathroom, rather than removing tile. Or I could get a longer shower head that extends further to the tub so when it does drip, the water lands in the tub and not onto the edge of the tub onto the floor.