Water flow capacity in pipes. Standard velocity 5-8 ft/sec. 1/2 inch for fixtures, 3/4 inch main supply, 1 inch for multiple fixtures. Higher velocity causes noise and erosion. PEX flexible and easier to install, copper traditional and heat-tolerant.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
Main: 3/4 to 1 inch, branch lines: 1/2 inch, high-flow fixtures: 3/4 inch.
PEX flexible, cheaper, freeze-resistant. Copper durable, handles high heat, traditional.
Ideal 5-8 ft/sec. Over 10 ft/sec causes noise, water hammer, and pipe erosion.