Shower Drips when Toilet Flushed???

Old 12-10-08, 05:13 AM
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Shower Drips when Toilet Flushed???

This is a huge mystery...when we flush the toilet on our second floor bathroom, the shower heavily drips until the toilet is full. It does this to a lessor extent when the third floor toilet is flushed and doesn't drip otherwise.

This may not be relevant, but when taking a shower and someone flushes the toilet, the cold water pressure goes way down and the shower water temperature gets hot.

I have since changed the single valve stem in the shower but this didn't do much.

Old 12-10-08, 03:20 PM
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This may be a single valve faucet, but it does not sound like you have a pressure balance faucet. With a preassure balanced faucet, if the pressure drops on one side, it also drops the pressure on the other side. Flow may change, but temp should not dramatically change. It also sounds like you may have low water pressure or too small pipes. Another possibility is galvanized supply pipes that are partially rusted closed.
Old 12-14-08, 05:27 PM
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Its the faucet

You have a washer less faucet. (Not really, it just has rubber cups and springs rather then a compression bibb washer.) If you will replace the cups and springs it will be fine. The springs become weak and when there is low pressure in the system the spring is not strong enough to keep the cup pressed against the stem.

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