
01/16/11, 02:23 PM
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Join Date: May 2006
Location: Manitoba, Canada
Posts: 1,110
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If your drain pipes are properly sloped, the only place water sits is in the bottom of the trap. Normally, all the sink traps are within the heated part of the trailer, as is the trap built into your toilet. So it is usually the shower and tub drains where you have the trap extend into the crawl space.
Since there should be no water in most of the sewer line except shower and tub traps, insulation and heat tape is mostly wasted. If you insulate securely around those vulnerable traps, you should avoid most freezing incidents. I live in the Great White North, and sometime with windchill, even insulated skirting and all the rest isn't enough. Pouring warm water in the tub and waiting for the temp to come back up a little usually solves the problem.
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