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Insulation for shower drain

I have a shower stall that is above an outside back porch. Every winter the drain freezes. We have replaced the piping and have put as much fiberglass insulation in the ceiling over the porch as would fit. The pipe continues to freeze. What would be the best approach to insulate this area and prevent the freezing every year?

Re: Insulation for shower drain

If there is no source of heat, the insulation will only slowdown the freezing of the pipes, it won't stop it. Any insulation that you have put in the ceiling must all be below the pipes, any placed above the pipes will cause them to freeze that much quicker. Do not wrap the pipes in insulation, that will make them freeze also.

If the pipes are insulated only on the cold side, then there are two choices: wrap the pipes in electric heat tape or leave the water dripping into the pipes when it is below freezing. You should only need to heat around the P trap.


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