The Challenge: Multi-Family Hot Water Recirculation Failure
The HOA Board of a 16-unit condominium building in Golden, CO was facing a financial crisis. Over an 18-month period, the building suffered from six separate catastrophic water leaks originating in the central plumbing chases. The leaks were cascading from third-floor units down into the units below, resulting in tens of thousands of dollars in drywall, paint, and flooring remediation.
With the HOA master insurance policy threatening non-renewal, the Property Management company reached out to Master Plumber Bill Clark at Just Plumbing, Inc. to formally diagnose the building and present a permanent solution at the next Board meeting.
The Master Plumber Diagnosis
During the structural audit, Bill Clark identified that the building's central hot water recirculation loop was suffering from severe velocity erosion. To ensure all 16 units had instant hot water, the original builders installed an oversized circulation pump that forced water through standard, thin-wall Type M copper lines 24 hours a day.
The hydraulic friction scoured the protective oxide layer off the inside of the copper, wearing the metal paper-thin—particularly at 90-degree elbows. Bill proposed a hybrid commercial repipe: replace the main 3-story vertical risers with heavy-duty Type L Copper (to handle velocity and meet commercial fire-stop code), and install individual sub-meters and Uponor PEX-A lines branching into each unit to minimize drywall destruction.
Transparent HOA Board Communication
Managing a multi-family repipe requires more than just plumbing skills; it requires resident communication. Bill Clark personally attended the HOA Board meeting to present the mechanical engineering plan.
Shelly Clark coordinated directly with the property manager to distribute phased 48-hour entry notices, clear scheduling timelines, and daily water shutoff windows so every resident knew exactly what to expect.
The Phased "Vertical Stack" Execution
Isolating Work Zones to Prevent Displacement
Displacing 16 families to hotels would have bankrupted the HOA reserves. Instead, Just Plumbing executed the project in "vertical stacks" (Units 101, 201, and 301 simultaneously). By isolating the water service to just one stack at a time between 8:00 AM and 4:30 PM, the rest of the building remained completely functional.
Main Risers & Fire-Stopping
Our crew opened the central hallway chases, extracting the degraded copper. We installed new commercial Type L Copper risers. Because these pipes penetrate floor/ceiling assemblies, Bill ensured all penetrations were rigorously sealed with commercial intumescent fire-stopping caulk to maintain the building's structural fire rating per City of Golden municipal code.
Unit Branching & Drywall Repair
Inside the individual condos, we transitioned the copper mains to Uponor PEX-A expansion tubing. This highly flexible material was fished through the ceilings to feed kitchens and baths, drastically reducing the amount of drywall that needed to be cut. At the end of each stack phase, our professional drywallers patched, textured, and primed the common areas and interior walls.
The Outcome
The entire 16-unit complex was successfully repiped ahead of schedule and under the HOA's authorized budget. The new Type L risers eliminated the velocity erosion threat, and residents immediately noticed improved water pressure. Just Plumbing issued the final Master Plumber sign-off to the HOA board, successfully allowing them to renew their master insurance policy without premium penalties.
Learn more about our Commercial Repiping Services, read about Copper Pinhole Leak Diagnosis, or explore another residential project in our Park Hill Case Study.
Frequently Asked Questions — Condo Repiping
Why do hot water recirculation lines fail so quickly in condo buildings?
Multi-family buildings utilize continuous recirculation pumps so residents have instant hot water. Over time, the high velocity of this continuously moving water mechanically erodes the inside of standard copper pipes, particularly at 90-degree elbows, leading to rapid pinhole leaks.
Did residents have to move out during the HOA repipe?
No. Just Plumbing organized the project in vertical "stacks." By isolating specific units vertically, we completed rough-ins during the day and restored domestic water service every evening, preventing costly hotel relocation expenses for the HOA.
Why did Just Plumbing use both Type L Copper and PEX-A for this commercial project?
Commercial building codes and fire-stopping requirements often dictate rigid, non-combustible materials for multi-story vertical risers. We installed commercial-grade Type L Copper for the main building risers, and transitioned to flexible Uponor PEX-A inside the individual units to minimize drywall demolition.