PEX is flexible and forgiving, but a reliable system still depends on planning, the right fittings and a proper pressure test. Here is how the work is done, and where a pro belongs.
PEX (cross-linked polyethylene) has become the go-to material for repiping in Central Florida because it resists corrosion, handles our hard water well and flexes around corners with fewer fittings than copper. Its ease of handling also makes it appealing to handy homeowners. This guide explains how to install PEX the way professionals approach it, so you understand the process whether you are tackling a small project or hiring someone for a whole-home repipe.
Before you start: permits, codes and honest limits
A few ground rules come first:
- Check permit requirements. Replacing or adding water distribution piping generally requires a permit from your city or county. Call the building department before buying materials. Unpermitted plumbing can cause problems with insurance claims and home sales.
- Follow the manufacturer’s instructions. PEX systems are tested as a set. Pipe, fittings and tools should be used together exactly as specified.
- Know your limits. Whole-house repiping, connections at the water heater and main service, and any work inside finished walls are best left to a licensed plumber.
If your home has polybutylene or aging copper, read our guide to older pipe materials and repiping evaluations first.
Step 1: Plan the layout
PEX systems typically follow one of two designs:
- Home-run with a manifold. Each fixture gets its own line from a central manifold with individual shutoffs. This uses more pipe but delivers steadier pressure and makes isolating a fixture easy.
- Trunk and branch. A larger main line runs through the house with smaller branches teed off to fixtures. It uses less pipe but more fittings.
Sketch the route from the main shutoff to each fixture. In slab homes, lines usually run through the attic and drop down inside walls. Mark where each line will run, where it will pass through framing and where supports are needed.
Step 2: Choose the right materials
Gather:
- PEX tubing in the correct sizes, with red and blue for hot and cold to keep things clear
- Fittings compatible with your chosen connection method
- Crimp rings, cinch clamps or expansion rings to match
- The correct tool for that system, along with a go/no-go gauge for crimp rings
- A PEX cutter that makes square, clean cuts
- Supports and hangers rated for PEX
- Stub-out elbows or brackets for fixture connections
- Pipe insulation for attic runs
Step 3: Shut off and drain the system
Close the main shutoff valve and open the lowest faucets to drain the lines. Turn off power or gas to the water heater before draining or disconnecting it. Have towels and a bucket ready at each connection point.
Step 4: Cut and connect
- Cut the tubing square with a PEX cutter. Angled or crushed ends cause leaks.
- Slide the ring or clamp onto the pipe before inserting the fitting.
- Push the fitting fully into the pipe so it seats against the shoulder.
- Position the ring the specified distance from the end.
- Compress with the tool and check every crimp with the go/no-go gauge.
For expansion systems, expand the pipe and ring together in steps, rotating the tool, then insert the fitting quickly so the pipe shrinks back around it.
Step 5: Support and protect the pipe
PEX expands and contracts with temperature more than metal, so leave a little slack in long runs. Support horizontal runs at the spacing the manufacturer and local code require, and use protective sleeves or grommets where PEX passes through metal studs or drilled framing. Install nail plates where pipe passes close to the face of studs. Keep PEX away from recessed light housings, flue pipes and other heat sources, and never leave it exposed to sunlight.
Step 6: Make the fixture connections
Use stub-out elbows to bring lines through the wall at sinks and toilets, then install quarter-turn angle stops. At the water heater, follow the manufacturer’s requirements. Many heaters require a length of metal pipe or a specific connector before transitioning to PEX.
Step 7: Pressure test before closing walls
This is the step that cannot be skipped. With all fixtures capped or valves closed, pressurize the new system and watch a gauge for the period required by your local inspector. A steady reading means tight joints. A drop means a leak. Find and fix it, then retest. Never close up a wall before a successful test and any required inspection.
Step 8: Flush, check and insulate
Open each fixture slowly to purge air, then check every joint again with water flowing. Insulate attic runs to protect against summer heat and the rare Central Florida freeze.
When to call K&K Plumbing
PEX is forgiving, but whole-house work involves code requirements, permits and many hidden connections. Our licensed team handles complete repiping services using PEX, copper or CPVC depending on the home. Homeowners in Marion County can see our Ocala repiping page. To learn why so many homeowners choose this material, read about the benefits of a PEX plumbing system.
Thinking about a PEX project and want a professional opinion first? Call or text 352-810-9472. We can evaluate your existing piping, explain what the job involves and give you an upfront quote for a permitted, pressure-tested installation.
Need help with repiping services?
K&K Plumbing’s licensed team handles repiping services across Central Florida — call or text 352-810-9472 for a free estimate.