how to add sprinklers to existing system

3 min read 07-02-2025

how to add sprinklers to existing system

Adding sprinklers to your existing irrigation system can significantly improve your lawn's health and curb appeal. Whether you're expanding your coverage to a newly landscaped area or simply need to address dry spots, this guide provides a step-by-step approach to seamlessly integrate new sprinklers into your existing setup. This process is manageable for DIY enthusiasts with some basic plumbing knowledge. However, if you are uncomfortable working with water lines, it's best to consult a professional irrigation installer.

Assessing Your Current System and Planning Your Expansion

Before you begin digging, thoroughly assess your existing sprinkler system. This crucial first step ensures a smooth and efficient expansion.

1. Identify Your System's Components

Main Water Line: Locate the main water supply line that feeds your current sprinklers. Note its diameter and pressure.
Valve Locations: Pinpoint the location of your existing valves. These control the water flow to different zones.
Backflow Preventer: Verify the presence and functionality of your backflow preventer. This device prevents contaminated water from flowing back into your main water supply.
Water Pressure: Check your water pressure. High pressure might necessitate pressure regulators. Low pressure may limit your options for new sprinkler heads. You can use a pressure gauge to check this.
Existing Sprinkler Zones: Determine which zone(s) the new sprinklers will be added to. Adding to an overloaded zone may necessitate splitting it into two.

2. Planning Your New Sprinkler Zones

Coverage Area: Outline the area you want to cover with new sprinklers. Consider the throw distance of the sprinkler heads you intend to use. Overlapping coverage ensures even watering.
Sprinkler Head Selection: Choose the appropriate sprinkler heads based on the area and desired coverage pattern. Rotors are best for larger areas, while spray heads work well for smaller spaces.
New Zone or Existing Zone: Decide if you'll create a new zone or add to an existing one. Creating a new zone might require a new valve and wiring. Adding to an existing zone could overburden it.

Tools and Materials

Gathering the necessary tools and materials beforehand streamlines the installation process.

Shovel: For digging trenches.
Pipe Cutter/Saw: For cutting PVC pipe.
PVC Glue and Primer: For joining PVC pipes.
PVC Pipe: Use the same diameter as your existing system.
Sprinkler Heads: Select the type and quantity you need.
Valves (if creating a new zone): Choose valves compatible with your system.
Fittings: Elbows, tees, and other fittings needed to connect the new pipes.
Wire and Connectors (if creating a new zone): For wiring the new valve.
Tape Measure: For accurate measurements.
Level: To ensure even sprinkler head placement.

Installing the New Sprinklers

This section details the steps for adding sprinklers, whether to an existing or new zone.

1. Digging Trenches

Carefully dig trenches from your existing main line or valve to the planned locations of your new sprinklers. Keep the trench depth consistent with your existing piping. Trenches should be wide enough to easily work with the pipes and fittings. Mark the location of underground utilities before digging to avoid accidental damage.

2. Connecting the Pipes

Use PVC glue and primer to securely connect the new PVC pipes to the existing system. Ensure all connections are tight and leak-free.

3. Installing Sprinkler Heads

Install the sprinkler heads according to the manufacturer's instructions. Ensure they are level and positioned for optimal coverage.

4. Testing and Adjustments

Once everything is connected, turn on the water and check for leaks. Adjust the sprinkler heads as needed to achieve even coverage.

Adding a New Zone (Advanced)

Adding a new zone to your irrigation system requires more significant work and involves adding a new valve and wiring. It's advisable to consult a professional for this process. However, if you're comfortable with electrical work, here's a brief overview:

Install a New Valve: Install a new valve on your main water line, ensuring compatibility with your existing system.
Run New Wiring: Connect the new valve to your existing controller using appropriate wiring.
Connect the New Zone: Connect the pipes from the new valve to your new sprinklers.
Test and Adjust: Test the new zone to ensure everything is working correctly. Adjust the sprinkler heads for optimal coverage.

Maintaining Your Expanded System

Regular maintenance is crucial to ensure the longevity of your irrigation system.

Check for Leaks: Regularly inspect your system for leaks and address them promptly.
Clean Sprinkler Heads: Clean clogged sprinkler heads to ensure even water distribution.
Winterize Your System: Properly winterize your system to prevent damage from freezing temperatures.

Adding sprinklers to your existing irrigation system improves your lawn's health while enhancing your property's aesthetics. By following these steps and using the right tools, you can successfully expand your system and enjoy a lush, well-watered lawn. Remember, safety should always be your top priority. If you're unsure about any part of this process, consult with a professional irrigation installer.