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The Associated Landscape Contractors of Colorado are at it again, giving us wise advice on keeping our sprinkler systems in top shape.  After their helpful information on winterizing the backflow preventer published in a previous post, they have super-sized their advice by sending out instructions on the rest of the system:

“Each year, many Colorado homeowners have serious water damage when the sprinkler system left in summer-mode freezes in November or December.  Winterizing most sprinkler systems runs in the $100 range, but repairs due to freeze damage can be many times that amount.  Proper winterization can save you a world of grief–and a lot of dollars. 

How to get your system ready for winter:
-Wrap the backflow prevention device located outside to help prevent freezing before your system is fully winterized.

– Shut off the water to the sprinkler system.  There’s usually a shut-off valve in the basement.

– Drain water from the backflow prevention device from the ports. 

On warm days, you can turn the water back on and run the system until it is winterized.

Schedule a winterization.  Some homeowners think draining the sprinkler system is all they need to do.  But even when the system is drained, water often remains in the pipes and in the sprinkler heads.  Remember, water expands when it freezes and pressure from that expansion can burst pipes and damage sprinkler heads and other parts.

 Winterizing is done with an air compressor, and because of the equipment, usually requires the help of a landscape service contractor.  The compressor is hooked up to the sprinkler system and zone-by-zone pushes air into the pipes so that all the water is forced out. This process takes 1 to 3 minutes per zone.  Winterizing the system with compressed air is the best way to make sure your sprinkler system has no water in it that can freeze, create damage and lead to costly repairs. 

What to do with the controller (timer):

If the controller is outdoors – Manufacturers recommend leaving the power on and the dial or switch in the “Off” position. 

If the controller is indoors – Either leave the power on and the dial or switch in the “Off” position OR remove the battery backup and unplug the transformer from the power outlet.

 To find a contractor to winterize your sprinkler system, go to www.alcc.com and click on Find a Pro.

Published with permission from ALCC.

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Years ago, in one of my more embarrassing moments, I learned the value of winterizing the sprinkler system.  My spouse had shut the system off that fall, bleeding the lines dry. But on a warm January day while he was at work, I decided to water the trees the easy way by turning on the sprinklers.

Things were fine for a few days but then a hard cold snap settled in and froze the lines.  Once things warmed up again, a broken pipe near the house began to leak.  No, leak is an inadequate word here – water was gushing.  This was the main line running to the valve box; a big, three-quarter inch pipe that can put out a lot of water.

I know the sounds of my house, and “fire hose” isn’t one of them, so I did the only thing that seemed logical:  run around in a panicked circle a few times, then call my spouse at work.

After a moment of sheepish explanation on how water got into the lines, he told me to shut the water off to the sprinkler system until he got home to figure it out.  You know that moment in the movies where the hero/heroine have to go into the dark tunnel filled with icky things?  This is the same thing – it was a crawl space. 

Some things I won’t do, so I ran to my neighbor for help.  Matt is a brave man and a kind one, so he sighed and jumped into the darkness to go shut the line down.  Years later, we three still remember every detail of that day.

With the record setting low, our gardens are saying goodbye for the season, and although we may get a few more weeks out of our plants, the time has come to start shutting the systems down.  When to do this is a question haunting many, so it was with pleasure that I read the email Tip of the Week from the Associated Landscape Contractors of Colorado ( you can sign up to receive this too – just go to their website.  This is a professional organization, not a company, so they won’t try to sell you something.):

“One simple precaution can save you $100 in sprinkler repairs and a world of grief,” their tip reads, “Every year that first early freeze catches homeowners off guard and the most expensive part of their sprinkler system freezes–often causing flooding and water damage.  Then there’s the repair bill to fix the tiny part that froze.

“Protect the most expensive part in your sprinkler system:  the backflow prevention device.  This component is required on all systems because it keeps the water that’s in your sprinkler system from backing up into the domestic water inside the house.  It’s also the most vulnerable part of your system if there’s a freeze.  It’s usually located somewhere outside the home and next to the foundation.

“This precaution will help protect the backflow from early freezes and still allow you to run your sprinkler system until it’s winterized.

– Wrap the backflow device with a towel which provides insulation.

–  Then wrap the device and towel with a plastic bag and secure with duct tape.  The bag keeps moisture that can freeze out of the device.

“Be ready to take these additional precautions before winter sets in:

– Drain the backflow so there is no water left in the device.  If you don’t know how to do this, call a pro.

– Winterize the system.  You won’t be able to operate your sprinkler system after draining it, so you are ready for the final step of protection which is having the system winterized by blowing out the lines (pipes) with compressed air.

“For help with winterizing your irrigation system to prevent freeze damage, go to the ALCC website and click on Find a Pro, a service that helps you search for companies in your area.

As a general guideline, get your sprinklers winterized before mid-November.

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