Galvanic corrosion between dissimilar metals is one of the most commonly missed causes of early pipe failure in Nelson, NH homes. When copper pipe is connected directly to galvanized steel without a dielectric union, the electrochemical potential difference between the two metals accelerates corrosion at the joint - typically consuming the galvanized metal at the connection point significantly faster than isolated galvanized pipe would corrode on its own. The result is an accelerated failure at exactly the transition point where the homeowner sees a drip at the fitting. Repairing the leak without addressing the galvanic connection is a temporary fix that will fail again. Proper repair installs a dielectric union that isolates the two metals electrically.
Under-slab pipe failures deserve a separate discussion for Nelson homeowners. When a water supply line or drain runs through or beneath a concrete slab foundation and fails, the repair options are different from above-ground failures. Direct excavation of the slab is one path - effective but disruptive, particularly for finished interiors. Pipe rerouting outside the slab is often the preferred alternative for supply lines: running a new line through the wall and ceiling cavity to bypass the failing under-slab section entirely, leaving the old pipe capped in place. This approach eliminates the risk of future slab leaks in that run, avoids concrete disturbance, and is often faster and less expensive than slab penetration for supply-line applications.
After any pipe repair work - single fitting, section replacement, or full repipe - pressure testing is a non-negotiable step. The process involves closing all fixtures, pressurizing the supply line to standard working pressure, and observing the pressure gauge over time. A line that holds pressure for the test duration confirms that all connections in the repaired section are holding. A pressure drop reveals a leak that may be at a new connection made during the repair, which is far preferable to discovering it days later as water damage. ESM Plumbing INC performs pressure testing as a standard completion step on every pipe repair in Nelson because the goal is not just a repair that appears dry - it's a repair that is verified to be watertight before we close up and leave.
Material-specific repairs using the right method for your pipe type, not a one-size approach.
Copper-to-galvanized connection failures repaired with proper dielectric union installation. We address the electrochemical cause rather than just the visible leak, preventing the accelerated corrosion from recurring at the same point.
Braided flex connectors under sinks, toilets, and appliances degrade and fail from age and vibration. We replace all standard connections with appropriately rated stainless-braided flex lines and verify the shutoff valves are operational.
Full static pressure test of all repaired sections before job completion. No repair is finished without pressure confirmation. We also identify and correct any existing pressure issues that could stress the new work.
When under-slab supply lines fail, we reroute replacement lines through wall and attic cavities, bypassing the failing slab section entirely. Avoids concrete disturbance and eliminates future slab leak risk in the rerouted run.
PEX manifold systems with port valves allow individual supply line isolation. We service, repair, and replace manifold assemblies, individual port valves, and damaged home-run lines from manifold to fixture.
Polybutylene pipe installed in the 1970s through mid-1990s degrades with chlorinated water contact and should not be repaired - only replaced. We identify PB pipe on inspection and repipe affected sections with modern materials.
Material assessment first, then the right repair method - not the fastest one.
Describe what you're seeing - active leak, low pressure, discoloration, visible corrosion. We schedule same-day or next-morning in most Nelson service areas.
Tech identifies pipe material, age, and the specific failure type. This determines whether a spot repair or section replacement is appropriate, and which method fits the material.
You receive a clear quote that explains the repair method, materials used, and why it's the right approach for your pipe type. No surprises after the work is done.
Repair completed, pressure test performed, and all connections confirmed before the job is closed. Documentation provided for insurance or permit records where needed.
“We had a slab leak and were dreading tearing up the floor. ESM Plumbing INC rerouted the line through the wall instead. No slab cutting, minimal disruption, all finished in a day. The reroute was the smarter call.”
“Our old galvanized pipes were affecting water pressure for years. ESM Plumbing INC identified the galvanic corrosion problem at the copper transition and repiped the affected section properly. Pressure is back to normal.”
“During a repair call, the tech noticed polybutylene in one section of our supply lines and explained why it needed to come out. Replaced it, documented everything, and we’re set. Thorough work.”
Licensed pipe repair and repiping services for Nelson and all of Nelson, NH. Flat upfront pricing, verified repairs.
☎ Call Now: +1-855-718-1500Pipe repair and repiping services throughout the Nelson region and all of Nelson, NH.
