Winterizing Laundry Sink Sump Pump - Plumbing - Contractor Talk

Winterizing Laundry Sink Sump Pump

Thread Tools Search this Thread Display Modes
Old 10-09-2017, 07:48 PM   #1
Willin's Avatar
Trade: Retired
Join Date: Aug 2012
Location: Where it snows
Posts: 325
Rewards Points: 434

Winterizing Laundry Sink Sump Pump

Roughing in right now, new construction, summer vacation house in area with deep cold winter. Basement laundry will have washing machine discharge to utility sink adjacent, will raise discharge to main drain above using a 1/3 HP sump pump directly under sink drain.

We figure there is about 8/10 gallon of fluid left in total of drain line riser, the check valve, the "throttle" valve, the pump itself, and the sink drain atop the pump.

A gallon of RV antifreeze costs about $4.50 at Walmart.

Here's the plan and we invite your critique.

We'll switch the pump, rather than direct-wire it. We'll mark the switch, "leave on always except for winterizing."

To winterize, we'll pour two gallons of antifreeze into the tub, move our hand to the switch, and switch the pump OFF when most all the two gallons is pumped away, leaving a little antifreeze in the tub.

This should ensure the pump and all the inline PVC 1-1/4 DWV pipe, fittings, valves, the riser, etc. is all safe from freezing.

Anything else?
Willin is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!




Old 10-09-2017, 07:54 PM   #2
John the Builder
SmallTownGuy's Avatar
Trade: Carpenter/Builder
Join Date: Sep 2012
Location: Oxford, MI
Posts: 13,227
Rewards Points: 1,708

Re: Winterizing Laundry Sink Sump Pump

what about the washing machine?


All my Life loving Hippie friends turned into soul-sucking Conservatives - or died. Same difference.
"Mornin' ladies, my goodness don't you look happy. Must be cuttin' somebody up pretty good." - Andy Griffiths
SmallTownGuy is online now  
Old 10-09-2017, 08:06 PM   #3
Willin's Avatar
Trade: Retired
Join Date: Aug 2012
Location: Where it snows
Posts: 325
Rewards Points: 434

Re: Winterizing Laundry Sink Sump Pump

SOP for the washer. Disconnect hoses, drain, run RV antifreeze in rinse cycle, etc., etc.
Willin is offline  
Old 10-09-2017, 10:14 PM   #4
tjbnwi's Avatar
Trade: Remodeling
Join Date: Feb 2009
Location: Cedar Tucky, Indiana
Posts: 8,393
Rewards Points: 4,926

Re: Winterizing Laundry Sink Sump Pump

You need to pump the RV antifreeze through the washing machine. Use a waterbed pump, connect it to the water inlet hoses, slowly hand cycle the timer or run it through a cycle if digital. Lay the discharge hose on the floor pour a gallon of RV anti freeze in the drum, it should run out the hose.

tjbnwi is offline  

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
laundry sink in a garage that can freeze nickko Plumbing 11 04-29-2015 07:04 PM
A Visitor from Paint / a plumbing question / bathtub backs up from sink JTemple Plumbing 24 02-12-2013 07:33 AM
Bathroom sink strainer drain issue with venting stanfordconst Plumbing 1 05-19-2011 06:06 PM
Mixing mortar with sump pump water mdshunk Masonry 13 01-25-2006 04:58 PM
sink pump zbwmy Plumbing 1 11-11-2005 03:47 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for

At we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?