A Did You Know Tip From Theiss Landscape Works
If your irrigation system is not properly winterized, freezing temperatures can cause serious and expensive damage. Pipes can crack, valves can fail, and backflow devices can break, often without any visible signs until spring.
Fortunately, winterizing your irrigation system is straightforward when you know what to do and what to avoid.
Why Irrigation Systems Get Damaged in Winter
Water expands when it freezes. If water is trapped inside your irrigation pipes or backflow preventer, that expansion can crack fittings or split components. This is especially common in the backflow device, which is exposed above ground and more vulnerable to cold temperatures.
Step One: Insulate the Backflow Device
Your backflow preventer is usually located on the side of your home. While designs vary, the pipes entering and exiting the device should be insulated and taped to reduce exposure to cold air.
Additional covers can be added for extra protection, but basic insulation is often enough for typical winter conditions.
Step Two: Turn Off the Water Supply
In front of the backflow device, there is usually a valve box in the ground. Inside, you will find a ball valve that controls water flow to the irrigation system.
Turn this valve 90 degrees so it runs perpendicular to the pipe. This indicates the water supply is fully shut off.
Step Three: Open the Test Valves
On the backflow device itself, you will see two small test valves. These valves should be opened so they are parallel with the pipe.
Opening them allows any remaining water to drain out of the system and relieves pressure inside the backflow preventer.
The Most Common Winterization Mistake
Many homeowners mistakenly turn the test valves off instead of opening them. This traps water inside the backflow device.
When that trapped water freezes, it expands and can crack the internal components or blow out the housing. Leaving the test valves open gives the water space to expand safely.
Extra Protection for Colder Weather
For areas that experience longer or more severe freezes, installing an insulated backflow cover can provide additional peace of mind. While not always necessary, it can help protect exposed components during extreme cold.
When Professional Help Makes Sense
If you are unsure where your shutoff valve is located or want to ensure your system is fully protected, professional irrigation winterization is a smart option. A trained technician can confirm everything is properly shut down and ready for winter.
If you have questions about protecting your irrigation system or would like assistance, Theiss Landscape Works is here to help. Proper winterization now can prevent costly repairs later.
