Tub draining weird

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Tub draining weird
Author: woody05 (CO) My tub has been doing this thing where it doesn't drain for a minute or two when first starting the shower and then it drains super fast. What could be the cause of this and how can I fix it?
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Re: Tub draining weird
Author: hj (AZ) IF this is a recent installation, the first thing that comes to mind is that it is double trapped, and if so there is NO easy correction for it.
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Re: Tub draining weird
Author: bsipps (PA) Couple questions Does this happen everytime anyone showers What level of the house is the shower on Is it a tub/shower combo How long has this issue been happening
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Re: Tub draining weird
Author: woody05 (CO) Happens most times but not every time It's on the main floor of a ranch- there is a basement It is a tub / shower combo Started a year or so ago
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Re: Tub draining weird
Author: bsipps (PA) Kind of an odd issue not sure if its venting or drainage could be a partial clog maybe hair
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Re: Tub draining weird
Author: bsipps (PA) Try filling the tuna a quarter full of water then drain it and see if you hear gurgling in any of the other fixtures like the toilet or kitchen sink
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