Duct Sealing & Repair in Langhorne, PA

The most expensive duct leak in lower Bucks County is the one above the ceiling. In the slab-built post-war housing around Langhorne and Levittown, forced air was retrofitted long after the houses were finished, and the only route left for it was the attic. On a July afternoon that attic sits well over a hundred degrees, so every leaking supply joint gives away air you paid to cool and every return-side leak drags that heat back into the rooms.

That is why sealing pays back faster here than in a house whose ducts run through a heated basement. PJ MAC seals and repairs ductwork across Langhorne, Penndel, Levittown, Newtown and the surrounding Middletown Township neighborhoods.

Retrofitted flex, thirty years on

Most of those attic systems were built with flexible duct, and flex ages in ways sheet metal does not. The outer jacket slackens, the insulation slides down the run and leaves bare liner exposed to attic temperatures, and the liner itself tears where it was banded to the collar. A section that has drooped between joists holds a low point that costs pressure every time the blower starts. None of it is visible from inside the house.

Where sealing pays and where it does not

Sealing an attic run is worth doing ahead of almost anything else, because air escaping up there is lost to the outdoors. Sealing a run inside a heated basement returns considerably less, since the leaked air stays within the thermal envelope. And on a system whose duct is too small for the equipment bolted to it, closing every joint sharpens the pressure problem rather than curing it. We measure first so the money goes where it comes back.

The return side in a slab house

Slab construction rarely left room for generous return duct, so a lot of these houses run on a single central grille sized for a smaller blower than the one behind it today. The shortage shows at the bedroom doors: with a door shut, the supply keeps feeding a room that has no legitimate path back to the air handler, and the pressure difference finds its own way out through the building shell. Adding a transfer path is one of the cheapest corrections available and usually does more for that room than new equipment would.

Rooms that were finished later

Newtown and the older borough housing bring a different set of faults. Spaces added after the fact — a converted porch, a garage turned into a family room, a bedroom finished in the attic — are frequently fed by a branch tapped into a trunk with nothing left to spare. The register is there, the air is not. That is a capacity problem in the duct, solved by reworking the branch rather than replacing the furnace.

What the visit involves

• ✓A static pressure reading at the air handler, compared against what the equipment is rated to work against
• ✓Delivered air measured at the registers that matter to you, not only at the one nearest the unit
• ✓Attic and crawlspace runs walked, with insulation coverage and collar connections inspected
• ✓Reachable seams, collars and plenum connections sealed with mastic rather than tape
• ✓Sagging flex re-supported and re-terminated, or replaced where the liner has torn

What sealing will and will not do

Sealed duct delivers more of what you already paid to produce, so rooms hold temperature better and the equipment runs less to get them there. It will not rescue a system that is undersized. What it will do is stop you buying a larger machine to overcome a problem the machine never had.