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Posted By NpS on 05/26/2021 8:49 AM
As far as underground water lines are concerned, no one can estimate the cost of replacing those lines 20 years from now, or what the useful life will be with reasonable accuracy.
For COAs/HOAs with significant length of underground piping, and having observed pipe failing within 25 years, this is one I have pondered. I think NpS is right on, regarding the high margin of error for estimates of useful life, or even the expected lifespan, of, say, PVC piping (which is often used for underground piping) are all over the map. Can PVC water supply piping be replaced piecemeal? Sure. But this is likely a lot more expensive than doing it all in one fell swoop.
How long does interior PVC pipe last? Longer than exterior pipe, for the most part. But the latter is not all that helpful. When would a condo association's interior pipe all have to be replaced? Maybe this point denotes the end-of-life for some condos, given that the replacement of interior pipe means tearing out all the walls and so on.
I wonder how long some condo buildings will last. The life expectancy of apartment buildings (without major renovations) is like 75-100 years. New York City has some apartment buildings over 100 years old. (Then again, New York City is supplied by "Water Tunnel No. 1" and "Water Tunnel No. 2," completed in 1917 and 1935 respectively. This is like 20+ foot diameter piping. The shutoff valves for the two tunnels are so beat up that engineers are afraid that shutting them, to do repairs on the tunnels, might mean the valves could not be opened again. Construction on Water Tunnel No. 3 started in 1970. Perhaps NYC is hanging on by a thread, infrastructure wise.)
A study of condos that have been razed on account of age yada could be interesting.
From Aug 2020, https://www.hawaiibusiness.com/condo-owners-beware-part-1/:
A Condominium Can Last Hundreds of Years, But Not Its Components
A 40-year-old Honolulu condominium can show its age in many ways: brittle, leaking pipes; cracks in its concrete walls and decks; rusted rebar; and corroded railings and window frames.
Dana Bergeman is the CEO of Bergeman Group, a local construction management company. He says many of Hawai‘i’s condominiums were built in the 1960s and ’70s and are reaching the point where they will need major infrastructure, cosmetic and architectural improvements to keep their value and remain liveable.
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Kimo Pierce, president of Hawaii Plumbing Group, says condo associations should start looking at replacing their pipes at 40 years and be ready to start the project at 45 years. Once the pipes hit 50 years, he says, a condo is “on borrowed time.”
Cast-iron drain, waste and vent pipes eventually rust from the inside out. That can lead to clogged and cracked pipes and, eventually, water leaks. It’s during the investigation of these leaks that contractors discover if the pipes need to be replaced, he says.
There can be millions of feet of pipes and hundreds of units in a high-rise condo, so the process to repipe involves a lot of coordination. Contractors hold town hall meetings before construction begins to educate owners about the project, its schedule and what’s expected of them. They also do a pre-construction walk-through of each unit to check for any preexisting water damage and to identify which walls will be removed and how they will be replaced.The cost to complete this work is generally influenced by the size of the building, how the pipes are laid out, the number of stacks shared between units and other variables, Lecky says. Pierce estimates that a one-bedroom, one-bathroom condo can cost $17,000 to $20,000 to repipe. That means a 100-unit building with all one-bed, one-bath units might cost $1.7 million to $2 million to repipe.
Bergeman says, depending on the building’s configuration, he’s seen per-unit prices range from less than $10,000 to over $80,000, but the typical cost is $20,000 to $30,000.