The basement and mechanical room are the most visible parts of a home's plumbing system — and in most cases, the most deteriorated Poly B in the building. Exposed runs, direct access to the water supply, and high fixture density make these areas both the highest-priority sections of a Poly B replacement and the most accessible.
What's Typically in a Basement / Mechanical Room
A typical Coquitlam home's basement or utility room contains: the water meter (or PRV after the meter), the main cold supply trunk, the hot water tank with both supply and outlet connections, basement bathroom supply lines if present, laundry connections, and any sub-floor heating supply lines. In many homes, the basement also has exposed overhead runs that supply the floors above.
All of these are high-priority in a Poly B assessment. The main supply and HWT connections are the highest-pressure points in the system and therefore the highest-risk failure points. An HWT connection failure inside a finished utility room can easily cause $15,000–$50,000 in damage before it's discovered.
- Water meter, PRV, and main cold supply trunk
- Hot water tank — both supply inlet and outlet connections
- Basement bathroom supply lines
- Laundry hookups and utility sink supply
- Overhead exposed runs to upper floors
Mechanical Room Replumbing
The mechanical room replumb is often the most technically complex part of a repipe because of the density of connections. Supply to the HWT, from the HWT, to any mixing valves, to the pressure relief, and to any recirculation pumps all terminate in this room. We work through this systematically — shutting down the system, removing all Poly B connections, and rebuilding in PEX-A to a clean, labelled installation.
We pay particular attention to ensuring proper support and spacing for the new runs. Well-supported PEX doesn't vibrate, doesn't knock against other components, and doesn't create movement-fatigue failures over time. Every run is clipped and labelled before we leave.
If the exposed plumbing in your basement is grey and plastic, it's Poly B and it needs replacing. provides a fast, clean basement and mechanical room repipe that gives your home's most critical plumbing section a 50-year reset.
Contact Coquitlam Poly B Replacement today to book your free inspection.
Questions About This Service
Can I do just the basement and mechanical room without replacing the whole house?
Yes. We'll give you a scope for whatever portion you want to tackle first. Many homeowners do the basement first for the highest-risk section, then plan the rest of the home.