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Is the waste pipe trap supposed to get this cold?
I'm in the process of finishing my basement and I'm looking to start sheetrocking in a few months. The frigid temps here in New York have been a really good test of the insulation I installed. Where the waste pipe exits the house, I have a cast iron trap with a vent that exits the house at ground level. I installed 1" rigid foam insulation right against the sides of the trap and spray foamed the gaps. I also installed Roxul in the framed 2x4 wall a foot away from the foundation to neatly cover up the pipes. I will be installing access panels to the clean outs.
When the temps were hovering around 10*F this morning, I noticed the area in the basement around the trap was very cold. I took out my infrared temp gun and realized the portion of the pipe that exits the house was 32* and the lower part of the pipe, where the water sits, was about 40*.
I've lived in the house for 10 years and I've never had a problem. But once the wall in front of the trap is sheetrocked, less warm air will be coming in contact with the trap.
This might seem like a silly question, but do I need to worry about water freezing inside the waste pipe?
Since the main vent stack is about 4 feet to the left of the trap and I have two inline vents located in other areas, is the vent connected to the trap necessary?
Thanks,
Logan