Plumbing Reference
Pipe sizing · Fixture units · Rough-in dims · Materials
Material Comparison
PEX-A
✓ Flexible, freeze-resistant, easy install, chlorine-resistant
✗ Requires special fittings, UV sensitive
Use: Residential supply lines
PEX-B
✓ Cheaper than PEX-A, barb fittings available
✗ Less flexible than PEX-A, slightly stiffer
Use: Residential supply lines
Copper (Type M)
✓ Durable, recyclable, proven track record
✗ Expensive, requires soldering skill
Use: Supply lines, hot/cold
Copper (Type L)
✓ Thicker walls, more durable, better for commercial
✗ More expensive than Type M
Use: Commercial, hot water recirculation
CPVC
✓ Chemical resistant, lower cost than copper
✗ Brittle, requires primer/cement, temp limited ~200°F
Use: Hot/cold supply, chemical lines
PVC (Schedule 40)
✓ Low cost, lightweight, easy to cement
✗ Not for hot water supply, UV degrades
Use: DWV, cold supply underground
ABS
✓ Lightweight, easy to cut/cement, handles cold well
✗ Not allowed in all codes, expands with temp
Use: DWV (common in western states)
Cast Iron
✓ Quietest drain pipe, very durable
✗ Heavy, expensive, requires no-hub bands
Use: Multi-story DWV stacks, hotels/apts