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Old 09-11-2010, 10:11 PM   #1
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How do I blow out the water lines in a house and how much air pressure should I use?


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Old 09-11-2010, 11:41 PM   #2
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Do you have a basement?

if so, jjust turn off the water then open up the hot water heater and anywere else you have a local low spot in the plumbing, such as a cloths washer hook-up.if you leave the upstairs faucets open, that should let it all drain down.

flush the toilet, scoop out as much water as you can, then add salt or RV antifreeze to the bowl


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Old 09-12-2010, 09:32 AM   #3
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There's no need to blow out the lines in a house to winterize. As forresth mentioned, just drain everything down. The only thing that causes a water line to burst is lack of room for expansion. When water freezes it expands. Thus, if the pipe is full of water and has no place to go it may burst. So if there is a small amount of water left, you shouldn't have a problem.

Keep in mind however, all the places water can get trapped. i.e. (not exhaustive list), toilets, supply lines (disconnect if necessary), exposed p-traps (uninsulated near a vent in a crawl space), etc.
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Old 09-16-2010, 12:40 PM   #4
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After drainng pipes, don't forget the washing machine and dishwasher, they need to have RV anti freeze run through the water pumps. My kitchen aid dishwasher i have to drain the water feed selinoid or it will freeze and brake. I would pour anti freeze in all drain traps and toilet traps. If you leave too much water in a pipe there is a good chance it will freeze and brake. I have 2 pipes that run under a door that i clear with air compresser, its easy to clear digging up concrete would be a project!

Last edited by jerzeedivr; 09-16-2010 at 12:43 PM.
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