Since 2003 · Patented in-slab duct restoration

The air your family breathesshouldn't be making them sick.

If your ducts run under the slab, years of moisture and rust are quietly pouring into every room of your home. DuctArmor restores them from the inside, with no jackhammers and no demolition.

US Patents #7,112,350 B1 & #8,529,992 B2
EPA-compliant coating
Non-hazmat shipping
Class A flame rating
Underneath a real home
The problem you can't see

Your ducts are buried in the concrete and you can't see them or the changes happening.

In a slab home, the ducts are buried under the concrete, in dirt. They're probably the most overlooked problem a house can suffer from.

Musty smell when the AC kicks on?
That’s mold growing where you can’t see it.
Rust stains around your vent covers?
Your ducts are rusting from the inside out.
Allergies worse inside than outside?
The air moving through your home passes over rust, dust, dirt, and possibly mold.

You don't need to demo your foundation to fix it.

The fix

A new duct, formed inside your old one.

We clean the inside of your existing ducts, then spray a proprietary polymer coating onto the walls. It bonds, hardens, and forms a new smooth surface that seals rust, cracks, and corrosion.

The original ductwork stays exactly where it is, where it's efficient. No need to open up the slab or convert to an overhead HVAC system. It saves thousands of dollars, and yet offers a better, more efficient, and more comfortable solution.

Protected by US Patents #7,112,350 B1 & #8,529,992 B2

DuctArmor-coated duct interior
After DuctArmor
Proof, not promises

Same duct. Drag to see the difference.

These are unretouched photos from real homes. Every job we do starts here, with a rusted, pitted, sometimes leaking piece of metal, and ends with a smooth, sealed, airtight new surface.

After DuctArmorBefore DuctArmor
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Before
After
Rectangular trunk with branch takeoffs
After DuctArmorBefore DuctArmor
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Before
After
Round supply line: corroded to coated
After DuctArmorBefore DuctArmor
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Before
After
Floor of a commercial return
After DuctArmorBefore DuctArmor
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Before
After
Heavy oxidation on twin takeoffs
The process

Three steps. One day. Zero demolition.

We inspect with a camera.
01

We inspect with a camera.

A certified dealer feeds a video scope through an existing register. You see exactly what we see: rust, debris, separations, water.

We clean every inch.
02

We clean every inch.

Loose rust, dust, and debris are removed through the existing openings. No demolition. No digging. Your flooring and foundation stay intact.

We coat the inside.
03

We coat the inside.

Our proprietary water-based polymer is sprayed through the duct in two full coats, forming a new smooth surface that seals everything in one continuous piece. The system can be used the same day and dries within a few days.

For homeowners

Give your family back the air they deserve.

Most in-slab ducts were installed decades ago and were never meant to last forever. If yours are leaking, rusting, or full of moisture, you're breathing a little bit of that every day. We can stop it in a single visit.

  • No demolition, no moved furniture, no open concrete.
  • Water-based, low-odor, safe for kids and pets.
  • Warrantied restoration through certified local dealers.
For facilities & property teams

Restore duct systems without shutting down the building.

Schools, clinics, offices, government buildings: the same in-slab duct failures that plague older homes happen at commercial scale, and the cost of replacement is usually six figures and weeks of downtime. DuctArmor is installed through existing openings, overnight if needed.

Downtime
Minimal
Fire rating
Class A Flame Rating
Asbestos
Encapsulated
Certified
Water-Based
No solvents. No fumes.
Certified
Non-Hazmat
Ships by ground. Stored like paint.
Certified
EPA Compliant
For asbestos encapsulation.
Certified
Fire Rated
Class A flame rating.
Certified dealers nationwide

Ready to stop breathing rust?

DuctArmor is available only through trained, certified dealers. Find the one closest to you and get a real inspection, not a sales pitch.

What people ask

The questions we hear every week.

Yes. Every step happens through your existing supply and return openings. We never need to break concrete, pull up flooring, or relocate equipment.