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Question DetailsAsked on 4/11/2016

New tub and shower faucet, when I turn tub water on water comes out of the shower head.

Only happens when water is turned on at full capacity.

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1 Answer


The flow out the tub spout is not as much as the pipe is capable of delivering, so some water is building up in the shower riser pipe - but only enough to come out when the faucet is full on - the rest of the time the spout can handle what the valve is letting through.

1) try fiddeling with the tub/shower selector lever or tab - might be partly stuck. Or if the type that is mounted on the end of the spout, as a pull-to-shower knob, if you do not push that down after a shower it commonly stays partly or fully engaged, trapping water in the shower riser to nail you (as room temp water) next time you start the shower. Push down on it with faucet off - if water comes out of spout or shower head it was vacuum locked, it is at least partly engaged and diverting part of the water to the shower. Commonly does not happen on older ones (though my 34 year old showers still do it) because lime and corrosion on the shutoff valve allow slight leakage.

2) if it is because the tub spout is undersized (some fancy ones are) or the shower feed lines are 1 inch (done in some newer and high-end houses to allow higher flow, especially to jetted tubs), then only solution may be to put on a shower head with a shutoff lever on it

3) check faucet itself if exposed head/control type - some have a shower diverter lever built into them which might be partly on

4) remote possibility of a partial blockage of the spout with wrapping material (like saran wrap) or caulk - if flow from spout seems low call plumber back to fix it

Answered 4 years ago by LCD

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