Condensate Leak in the Attic in Piedmont

Condensate Leak in the Attic in Piedmont

Piedmont's housing is mostly older Tudor, Mediterranean, and Colonial estate homes, built for heat rather than cooling. Where owners have added AC, the air handler frequently ends up in the attic of a multi-story house, above finished plaster ceilings. The climate is mild and these systems don't run constantly, but when they do they make condensate, and a blocked drain puts that water straight onto a ceiling that's expensive to repair.

This is rarely a dead system. The cooling coil makes water, a pan catches it, and a drain line carries it out of the attic. A clogged line, a failed pump, a cracked pan, or a float switch that never tripped is almost always the whole story, and each is a part-level repair. The emergency pan and float switch are the last barrier before the plaster gets wet, and on a lot of Piedmont retrofits into these old houses, that secondary protection was an afterthought.

Because cooling was added to homes that were never designed for it, the condensate plumbing in Piedmont attics is often the weakest part of the install. We see long runs through old framing, traps with no cleanout, and pans that were never leveled. We find the real cause and build the drain so it can actually be serviced, instead of clearing it and leaving the same setup to clog again.

Common causes

Clogged primary condensate line. Algae and biofilm plug the drain at the trap or an elbow, and water backs into the pan and over the edge onto the ceiling. We clear the line from the termination, confirm flow, treat it, and add a cleanout if the original run had none, which is common on these retrofit installs.

Float switch missing or failed. The safety float should shut the AC off before the pan overflows. In older Piedmont attic retrofits it was often skipped or the switch corroded and stuck. We lift-test it for shutdown and install a proper float switch on the pan and secondary drain when it's absent.

Failed condensate pump. Attic units in these multi-story homes often can't gravity-drain and rely on a pump. A dead motor or a stuck check valve lets water collect until it spills. We test the pump, replace it when it isn't lifting, and confirm it has a safety switch wired to cut the system on a backup.

Cracked or rusted primary pan. Steel pans rust and plastic pans crack with age, and a leaking pan ruins a ceiling even with a clear drain. We inspect with a light and mirror and replace the pan when it's gone. On an older air handler we'll tell you honestly whether the pan or the whole unit is the right call.

Unit not level / poor pan slope. An air handler set off level in an attic holds water at the low corner of the pan and overflows there regardless of the drain. We level the unit, shim or re-set the platform, and confirm the pan drains toward the fitting.

How we diagnose it

• Confirm the water is condensate from the attic air handler and not a roof or chimney-flashing leak finding the same plaster ceiling.
• Inspect the primary pan, emergency pan, and drain lines for standing water, rust, cracks, and a working trap.
• Lift-test the float switch and verify the system shuts off; flag it if there's no switch.
• Clear and flow-test the primary line, and bench-test the pump and its safety switch where the unit can't gravity drain.
• Level the unit and verify pan slope before calling the repair complete.

$75 diagnostic, credited toward any repair over $200. You get a written quote before any work begins.

Condensate Leak in the Attic in Piedmont: common questions

Nearby and related

Condensate Leak in the Attic near Piedmont: Oakland · Berkeley · Alameda .

This is usually a ac repair in Piedmont job. See our ac repair overview or the Piedmont service area.