What are the advantages of PEX pipe over copper?

PEX (cross-linked polyethylene) has become the material of choice for residential plumbing in Quebec. Here are its advantages compared to copper:

Advantages of PEX:

• Flexibility: Bends with a radius of 6 times the diameter, reducing fittings by 50-60%
• Freeze resistance: PEX can expand 10-15% without cracking, unlike copper which bursts
• Fast installation: Crimp or push-fit fittings — no soldering (torch). Time reduced by 30-40%
• Price: $0.50 to $1/ft for ½ in PEX, vs $4 to $6/ft for ½ in type L copper
• Corrosion resistance: No corrosion, no pitting, no mineral buildup
• Sound insulation: PEX is quiet — no expansion noise like copper

Disadvantages of PEX:

• UV sensitive — cannot be used outdoors without protection
• Risk of rodent gnawing
• Crimp fittings can leak if improperly installed (training essential)
• Estimated lifespan of 50 years (vs 50-70 years for copper)

PEX is approved by the Quebec Plumbing Code for potable water (PEX-A or PEX-B). It allows a manifold plumbing system where each fixture has its own dedicated line.