How much drop on a long waste line? Also q re: freezing lines


Old 12-12-05, 06:42 PM
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How much drop on a long waste line? Also q re: freezing lines

I'm considering moving the washer and dryer to a room over my 3 car garage, which is attached to the house. I'd need to run the water, electricity, gas and waste within a chute in the garage, to avoid ripping up the floor or cutting trusses. The chute, with pipes inside would run nearly 30 feet. Q1) how much must the waste line drop over it's length to provide proper drainage? Q2) What can I do to avoid freezing pipes? SE Michigan location. The garage is fully insulated (including the door) with a finished heated space above on attic trusses. Snow melts off the cars, but outside temp gets to -10 here periodically.

Thanks much for any advice.

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Old 12-12-05, 11:04 PM
majakdragon's Avatar
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Location: N.E. Arkansas
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Proper drainage is 1/4" per foot. Being a washer drain, realize that there is a lot of lint in the drain water. This causes clogs so slope is important. You will have to find a way to get heat into the chute to prevent freezing. Good luck with your project.
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