How to Reroute Sprinkler Lines? Easy Guide

Introduction

Rerouting sprinkler lines is a task that many homeowners encounter when redesigning their landscape, installing new hardscaping features, or repairing damaged irrigation systems. Whether you are dealing with a broken pipe, planning a new garden bed, or simply reorganizing your yard layout, understanding how to reroute sprinkler lines can save you hundreds of dollars in professional service calls and help you maintain an efficient watering system. This guide walks you through everything you need to know about rerouting sprinkler lines, from identifying your existing system to making clean, code-compliant connections.

Table of Contents

• Understanding Your Sprinkler System
• When to Consider Rerouting Sprinkler Lines
• Tools and Materials You Will Need
• Planning the Reroute: Mapping Your New Layout
• Shutting Off Water and Depressurizing the System
• Locating Existing Sprinkler Lines
• Cutting and Removing Old Piping
• Installing New Sprinkler Line Sections
• Making Secure Pipe Connections
• Testing the Rerouted System
• Backfilling and Restoring the Landscape
• Common Mistakes and How to Avoid Them
• Sprinkler Pipe Material Comparison
• Tips and Best Practices
• Frequently Asked Questions
• Conclusion

Understanding Your Sprinkler System

Before you begin rerouting sprinkler lines, it is essential to understand how your irrigation system is organized. Most residential sprinkler systems use either polyethylene (poly) tubing or PVC pipe to deliver water from the main supply to individual sprinkler heads. These pipes are typically arranged in zones, with each zone controlled by an electric solenoid valve that opens and closes based on signals from a central timer or controller. The main line carries pressurized water from your home’s water supply to the valve manifold, and then individual lateral lines branch out to supply water to each sprinkler head. Understanding this layout helps you identify which pipes you need to reroute and how to maintain proper water flow throughout the system.

Main Components of a Sprinkler System

The primary components include the backflow preventer, which protects your home’s water supply from contamination; the valve manifold, which controls water flow to each zone; the main line, which delivers water under pressure; lateral lines, which carry water to individual sprinkler heads; and the sprinkler heads themselves, which distribute water evenly across your landscape.

When to Consider Rerouting Sprinkler Lines

There are several common scenarios where rerouting sprinkler lines becomes necessary. If you are installing a new patio, driveway, or garden bed, the existing pipes may be in the way and need to be relocated. Tree roots can crack or displace pipes over time, requiring targeted rerouting to restore proper function. Freezing temperatures in colder climates can cause pipes to burst, leaving you with no choice but to replace or reroute damaged sections. Additionally, if your sprinkler system is inefficient and overwatering certain areas while neglecting others, rerouting can help you achieve better coverage and water distribution.

Tools and Materials You Will Need

Having the right tools and materials on hand will make your rerouting project much smoother. Gather the following items before you start:

• Waterproof tape and pipe clamps
• Pipe cutter or hacksaw suitable for your pipe type
• Teflon tape or pipe joint compound
• New sections of poly tubing or PVC pipe matching your existing system
• Barbed fittings, couplers, and tees as needed
• Shovel and flat-head shovel for trenching
• Pressure testing equipment or a simple garden hose attachment
• Utility knife for cutting poly tubing
• Safety gloves and eye protection

Planning the Reroute: Mapping Your New Layout

Effective planning is the foundation of a successful sprinkler line reroute. Start by sketching a rough map of your current system, marking the location of each sprinkler head, valve, and major pipe run. Identify the section of pipe that needs to be moved and determine the best path for the new line. Keep the following considerations in mind:

1. Maintain Grade: Ensure new pipes slope slightly downward away from your home’s foundation to prevent water pooling.
2. Avoid Obstacles: Route new lines around tree roots, building foundations, and underground utilities.
3. Minimize Disruption: Plan the shortest practical route that avoids disturbing established landscaping unnecessarily.
4. Maintain Pressure: Avoid sharp bends and excessive fittings that can reduce water pressure.

Once you have mapped the new layout, mark the proposed trench path with spray paint or garden hose to visualize the route before digging.

Shutting Off Water and Depressurizing the System

Safety and efficiency begin with properly shutting off and depressurizing your sprinkler system. Locate the main water shut-off valve, usually found near your water meter or where the main line enters your home. Turn the valve clockwise to stop the flow of water. Next, open the highest sprinkler head in each zone to release any remaining pressure in the lines. This step prevents unexpected bursts of water when you cut into the pipes and makes the entire process safer and cleaner.

Locating Existing Sprinkler Lines

Finding your existing sprinkler lines without unnecessary digging is crucial for a clean reroute. If you have original installation plans, use them as a reference. If not, you can use a metal detector to trace metal piping or a pipe locator device that detects the electromagnetic signature of buried lines. For non-metallic poly tubing, carefully probe the soil with a thin rod to feel for the pipe. As you dig, use a flat shovel and work slowly to avoid damaging the pipe. Once located, mark the pipe’s path with spray paint or flags so you can follow it accurately during removal and installation. (See Also:How Much To Move Sprinkler Heads)

Cutting and Removing Old Piping

With the water shut off and the lines depressurized, you can safely cut and remove the section of pipe that needs to be rerouted. Use a pipe cutter for clean, straight cuts that will make it easier to install new fittings. If you are removing a long section, dig a small access trench along the pipe’s path and carefully extract the old pipe. Be cautious not to damage nearby pipes or electrical wiring. After removal, clean the exposed ends of the remaining pipe to ensure a good seal when you connect the new section.

Installing New Sprinkler Line Sections

Installing new sprinkler line sections requires careful attention to both the pipe material and local plumbing codes. For polyethylene tubing, slide barbed fittings onto the pipe ends and secure them with stainless steel clamps. For PVC pipe, apply Teflon tape or pipe joint compound to threaded connections and use solvent cement for glued joints. Route the new pipe along the path you planned, ensuring it maintains the proper slope and avoids sharp bends. Use pipe supports or stakes to hold the line in place temporarily until you can backfill the trench.

Joining Poly Tubing

To join sections of poly tubing, push the barbed fitting fully into each pipe end and tighten the clamp until it is snug but not over-tightened, which could damage the tubing. Always double-check that the connection is secure before moving on to the next step.

Joining PVC Pipe

For PVC connections, cut the pipe cleanly with a hacksaw, deburr the ends with sandpaper, apply primer followed by solvent cement, and hold the joint together for a few seconds until the cement sets. This creates a permanent, watertight seal.

Making Secure Pipe Connections

Secure connections are essential to prevent leaks and maintain system pressure. Whether you are connecting to an existing pipe or joining two new sections, take time to ensure each fitting is properly seated and tightened. For threaded connections, wrap the threads with Teflon tape in a clockwise direction to create a watertight seal. For compression fittings, tighten the nut by hand and then give it an additional one to one and a half turns with a wrench. Avoid over-tightening, which can deform the fitting or crack the pipe.

Testing the Rerouted System

Before backfilling your trenches, it is critical to test the rerouted system for leaks and proper operation. Slowly turn the main water supply back on and observe each connection point for signs of dripping or pooling water. If you notice a leak, tighten the fitting slightly or disassemble and reseal the joint as needed. Once all visible connections are dry, activate each zone from the controller and watch the sprinkler heads to confirm they are spraying normally. This testing phase allows you to catch and correct problems while the system is still accessible.

Backfilling and Restoring the Landscape

After confirming that your rerouted sprinkler lines are leak-free, you can begin backfilling the trenches. Start by placing a layer of small gravel at the bottom of the trench to improve drainage and protect the pipe from abrasion. Carefully cover the pipe with soil, tamping it down gently to eliminate air pockets that could cause settling later. As you restore the landscape, reseed bare grass areas or replace sod to match the surrounding lawn. Take care not to compact the soil too heavily, which can damage newly installed pipes or hinder plant growth.

Common Mistakes and How to Avoid Them

Even experienced DIYers can make mistakes when rerouting sprinkler lines. Here are some of the most frequent errors and how to prevent them:

• Inadequate Planning: Rushing into the project without mapping the new layout can lead to unnecessary digging and poor pipe placement. Always plan the route in advance.
• Improper Slope: Installing pipes with the wrong grade can cause water to pool or drain unevenly. Maintain a slight downward slope away from buildings.
• Over-Tightening Fittings: Cranking fittings too tightly can damage threads or deform plastic pipes. Tighten securely but do not overdo it.
• Skipping the Pressure Test: Failing to test the system before backfilling means you may discover leaks after the trench is already filled. Always test first.
• Ignoring Local Codes: Some areas require permits or specific materials for irrigation work. Check with your local building department before starting.

Sprinkler Pipe Material Comparison

Choosing the right pipe material for your reroute depends on your climate, soil conditions, and existing system type. The table below compares the most common options: (See Also:Does Trugreen Install Sprinkler Systems)

Tips and Best Practices

Follow these expert tips to ensure a successful sprinkler line reroute:

• Call 811 Before You Dig: This free service marks underground utilities so you can avoid dangerous and costly strikes.
• Use the Right Tools: A sharp pipe cutter produces cleaner cuts than a dull hacksaw, reducing the risk of uneven joints.
• Keep Joints Accessible: If possible, install access boxes or leave small inspection points at key connections for future maintenance.
• Match Pipe Size Exactly: Using the same diameter pipe as your existing system maintains consistent water pressure and flow.
• Label Your Zones: As you work, label each valve and pipe section so future repairs are straightforward.
• Work in Layers: If rerouting multiple lines, install and test one zone at a time to isolate problems quickly.
• Consider a Smart Controller: Upgrading to a weather-based or soil-moisture-sensing controller can improve efficiency after your reroute.

Frequently Asked Questions

How Much Does It Cost to Reroute Sprinkler Lines?

The cost varies significantly depending on the extent of the reroute, your location, and whether you hire a professional. DIY materials typically range from $50 to $300, while professional services can cost between $500 and $2,500 or more. Larger jobs involving multiple zones or extensive trenching will naturally be more expensive.

Do I Need a Permit to Reroute Sprinkler Lines?

In most residential areas, minor sprinkler line repairs or reroutes do not require a permit. However, some jurisdictions mandate permits for any work involving the main water supply or new irrigation installations. Contact your local building department to confirm requirements before beginning your project.

How Long Does It Take to Reroute Sprinkler Lines?

For a typical residential job involving one or two zones, expect to spend 4 to 8 hours working alone. Factors that affect timing include the length of pipe being rerouted, soil conditions, the number of connections required, and how quickly you need to troubleshoot any issues that arise during testing.

Can I Connect Different Types of Sprinkler Pipe Together?

It is technically possible to connect different pipe materials using appropriate transition fittings, but it is not recommended for long-term reliability. Mixing materials can lead to differential expansion, incompatible joining methods, and increased risk of leaks. Whenever possible, match your new pipe to the existing system material. (See Also:How To Recharge Sprinkler System)

How Do I Prevent My Rerouted Lines from Freezing?

In freezing climates, bury polyethylene pipes at least 12 inches deep and insulate above-ground components. Consider installing a manual or automatic drain valve at the lowest point of each zone to remove standing water before winter. For PVC systems, use Schedule 80 pipe in exposed areas and wrap vulnerable sections with foam insulation.

What Should I Do If I Find a Leak After Rerouting?

Small leaks at threaded or compression fittings can often be fixed by tightening the connection or reapplying Teflon tape. For glued PVC joints, you may need to cut out the faulty section and replace it with a new coupling. If the leak is in a buried section, you will need to expose the pipe, repair the joint, and retest the system before backfilling.

Conclusion

Rerouting sprinkler lines is a manageable home improvement project that combines basic plumbing skills with careful planning and attention to detail. By understanding your system’s layout, gathering the right tools, and following a methodical approach from planning to testing, you can successfully redirect your irrigation lines to accommodate new landscaping or repair damaged sections. Remember to shut off the water, locate existing pipes accurately, make secure connections, and always test your work before restoring the landscape. With the guidance provided in this how to reroute sprinkler lines guide, you can tackle the job confidently and maintain an efficient, well-functioning irrigation system for years to come.