Step 6 · Running New PEX Lines
Now it's time to run the new PEX lines. Use blue PEX for cold water and red PEX for hot water to maintain clear identification. Starting at the manifold, unroll and run a continuous PEX line to each fixture location. You can often follow the same paths as the old pipes. If you need to drill new holes through studs or joists, use an auger or spade bit and keep the holes centered to avoid accidental piercing with future nails or screws. To prevent sagging and water hammer noise, secure the PEX tubing with plastic pipe hangers every 32 inches on horizontal runs and every 48 inches on vertical runs. PEX is flexible, so use wide, sweeping turns instead of sharp 90-degree fittings where possible.