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itssnowing

05:13AM | 08/12/07
Member Since: 08/11/07
1 lifetime posts
Bvplumbing
Hello. My 4" plastic sewer pipe freezes every winter. It is in a unheated crawl space, and drops a quarter of an inch per every foot of run.( total run is approx. 25' ) The pipe is wrapped with foil insulation. The crawl space is inclosed with foam insulation board. The cottage is on piers. I live in northern ny, and it is not uncommon for the temps to go -20. Im usually ok until late jan. early feb. The foil insulation was new last year, but only bought me a few weeks. Any advice or suggestions would be appreciated. I have no problems starting over. Thanks.

Billhart

05:40AM | 08/12/07
Member Since: 04/25/05
1918 lifetime posts
In most cases the drain pipe gets a slug of water and it move through and does not have time to freeze.

Either there is a low spot that holds water or you have a fixture that is dripping water.

The likely supsects are flapper valves on toilets.

Check the water level in the tank. Then turn the stop valve off and wait an hour. If the water level is down then the toilet needs to be fixed. Most likely it is a leaking flapper. But it can be syphoning through the refill tube or overflowing the overflow tub.
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