Water Supply Pipes
Copper
- Traditional, proven reliability
- Long lifespan (50+ years)
- Requires soldering
- More expensive
PEX (Cross-linked Polyethylene)
- Flexible, easy to install
- Push-fit or crimp connections
- Good for retrofits
- Can't be used outside (UV sensitive)
Polybutylene (PB)
- Similar to PEX
- Common in hot water
- Flexible installation
Drainage Pipes
PVC
- Standard for drainage
- DWV (drain, waste, vent) rated
- Solvent weld connections
- Long lasting
Cast Iron
- Traditional in older homes
- Quiet (less water noise)
- Heavy, expensive
- Still used in high-rises
Gas Pipes
- Copper: Traditional gas lines
- PE (Polyethylene): Underground gas
- Pex-Al-Pex: Modern alternative
Sizing
- Water supply: 15-20mm typical
- Basin waste: 40mm
- Shower/bath: 50mm
- Toilet: 100mm