Plenum Box In Attic Leaking Water

But this is an uncommon problem.

Plenum box in attic leaking water.

Shoot a boatload of foam insulation all around where the ducting connects to the plenum in the attic and your problem should be resolved. There are a few reasons why water would leak from the plenum. I find it interesting that the problem started after you moved the duct. If the metal anywhere on the ductwork is exposed to ambient air from the hot attic then it will cause the ductwork to sweat leak and cause damage in your attic.

This can help prevent the water from causing damage to the electrical components of your air conditioner and limit the amount of water damage to your home. Excessive air velocity through the evaporator coil could cause the condensation to blow over the pan and leak out of the plenum. Any leaking or pooling water around an indoor ac unit should be attended to right away. As soon as you discover a leak be sure to turn off your air conditioner.

The outside of the plenum is still condensing and the branch off the plenum zone that goes up a unconditioned flu chase up to the attic for the upstairs heating cooling is dripping water down the chase off the ducts. The duct is heated from 70 to 110 degrees or more in a couple of minutes with a furnace. Any ductwork that is installed in an attic must be either wrapped with insulation or you must use flex duct which is already insulated. It takes a sp.

Please make sure all ductwork is insulated.