03:53PM | 02/10/06
Member Since: 02/05/06
1 lifetime posts
demo'd the bathroom and installed a new shower stall. after running the show for 5 mins the drain clogs up. The plumbing in the house is all copper. So the shower stall has a 2" p-trap to a frenco 2" adaptor to the 2" copper waste line. after the p-trap is a TY(2"x2"x1.5") the 1.5" outlet is a horizontal air vent which leads to the roof. The waste from the shower stall leads to the 3" wasteline from the toilet. In the bathroom the toilet has a 3" copper waste line. The waste line also has a horizontal air vent, which is located after the toilet via 3x3x3 TY. after the 3x3x3 TY comes the 2" copper waste line from the shower stall.

I noticed that in the 5mins of running the water in the toilet bowl bubbles with air. why?

We snailed the main waste lines and have freed all the wastelines of any obsticals - but the problem remains, any idea?



03:48AM | 02/11/06
Member Since: 04/25/05
1915 lifetime posts
What happens to the water in the shower?

Does it eventually drain out? Does it gurgle.

It sounds like you have have a venting problem as shown by the gurgling of the toilet.

How I can visualize the layout, but having a horizontal run on the vent at the same level as the drain line does not sound right. It should go vertical for a distance before any horizontal sections.

And any horizontal sections need to have a POSITIVE slope towards the drain end so that any rain wateer will drain out.


06:44AM | 02/11/06
Member Since: 01/24/06
1626 lifetime posts
Me office1
Bill is totally correct, The vent laying on the horizontal is a no, no.

The desired system would have the waste line (drainage) pitching down away from the fixture so it can drain by gravity.

The vent line pitching up from the fixture being serviced.

Reasoning is simple, the warm air in the vent you want to go up hill as warm air is lighter and will move up drawing sewerage gases with it to the vent terminal.

Also with the vent line pitching up away from the fixture this will alllow any condensation in the vent piping to flow back towards the fixtures waste line.

Picture a large bottle of soda and you open the cap and turn it upside down the contents "plop" out starving for air you hear the gurgling sounds.

Now picture if you put a hole in the bottom of this same bottle you just created a funnel where atmospheric pressure equalizes as the contents are poured.

PERSONALLY I never install any drain or vent pipe under ground less then 2" but that is a matter of choice

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