Ductwork repair and sealing in Birmingham, AL
Ducts hide in the attic or under the floor, so their problems usually show up as a hot room, a high bill or a damp crawlspace. We find the leaks and the broken runs and repair what is already there.
Ductwork repair fixes the problems we find most in Birmingham homes: joints leaking at the plenum and boots, flex duct crushed or sagging, runs that have pulled apart, and ducts sweating in humid crawlspaces. Zeltman Heating & Air inspects the full system, seals with mastic, re-straps and reinsulates where needed, and quotes every repair before it begins.
What goes wrong with ducts in Birmingham attics and crawlspaces
Most duct trouble is not dramatic. It is a joint that was never sealed, a flex run that sagged a little more each summer or a boot that pulled away from the ceiling. Each one leaks a share of the air you paid to cool, and a duct leaking in a 130 degree attic loses a lot of it.
Crawlspace ducts have different problems. Humid summer air meets cold supply ducts and condenses, especially where the insulation wrap is torn or missing. That water drips onto the soil, raises crawlspace humidity and can rot wood and invite pests. On the red clay lots common around Birmingham, a damp crawlspace tends to stay damp.
Many of these repairs are straightforward. Joints get sealed with mastic, not cloth duct tape. Flex gets pulled tight and supported every few feet so it keeps its full diameter. Disconnected runs get reattached with proper collars and straps, and torn insulation gets replaced so the duct stops sweating.
Repair is the right call when the layout is basically sound and the problems are local. A home with a handful of bad joints, one crushed run and some torn wrap is a classic repair job. When the ducts are undersized for the system, badly routed or falling apart throughout, patching every joint costs nearly as much as starting over. In that case we will show you why ductwork replacement may be the better use of the money.
What we inspect on a duct repair visit
- Plenum connections at the air handler or furnace
- Supply trunk and branch joints for leaks
- Flex duct routing, sags, kinks and crushed sections
- Boot connections at ceiling and floor registers
- Return duct and filter grille seals
- Duct insulation for tears, gaps and missing wrap
- Condensation and water staining on crawlspace ducts
- Static pressure and airflow before and after repairs
What ductwork repair costs in Birmingham
$345 to $1,890
Reattaching a single disconnected run or sealing a leaky plenum sits near the low end. Sealing every reachable joint, re-strapping long flex runs and reinsulating a crawlspace system lands higher. If replacement makes more sense, we show you both numbers before any work starts.
Ask for a price (659) 777-4129What moves the number
- How much of the system needs work
- One disconnected boot is a short job. Sealing an entire attic system joint by joint takes most of a day.
- Access
- Low attics, tight crawlspaces and hillside homes with shallow access take longer to work in safely.
- Duct type
- Sheet metal, duct board and flex each repair differently, and older homes often have all three.
- Insulation work
- Replacing torn wrap on sweating crawlspace ducts adds materials and labor.
- Pest or water damage
- Ducts chewed by rodents or soaked by an old leak may need sections replaced rather than sealed.
How a duct repair visit goes
You tell us the symptoms
Hot rooms, dusty registers, a damp crawlspace or a high bill each point us toward different parts of the system.
We inspect and measure
The technician goes into the attic or crawlspace, follows each run and takes static pressure readings at the equipment.
You see what we found
We show you photos of the leaks, sags and breaks, explain which repairs will make a real difference and give you prices.
We make the repairs
Joints are sealed with mastic, flex is pulled tight and strapped, disconnected runs are reattached and torn wrap is replaced.
We measure again
After the repairs we check airflow at the registers and static pressure at the equipment, so you can see the change.
When duct repair is worth doing
One or two rooms never cool
A disconnected or crushed run to a single room is a common and inexpensive fix.
Dripping under the house
Sweating crawlspace ducts need sealing and new insulation before they damage the floor framing.
Dust blowing from registers
Leaky returns pull in dusty attic or crawlspace air and spread it through the house.
Higher bills with no new equipment
Duct leakage grows slowly, so rising bills on a healthy system often trace back to the ducts.
A new system is going in
Sealing the existing ducts before a new unit starts keeps that investment from leaking into the attic.
Whistling or rattling sounds
Gaps at joints and boots can whistle, and loose straps let ducts rattle when the blower starts. Both are usually quick fixes once we find the spot.
Duct repair in Birmingham area homes
The brick ranches in Huffman, Crestwood and Center Point often still have their original crawlspace ducts, sometimes with patches from several owners. Sweating, sagging and disconnected runs are routine finds there. In Glen Iris and other early 1900s neighborhoods, ducts added long after the house was built are often a patchwork of metal, duct board and flex. Each material needs its own repair method, so we note them as we go.
In Vestavia Hills split-levels, ducts squeeze through tight crawlspaces and low attics, which makes crushed and kinked runs more common. Two-story homes in Hoover and Trussville tend to have long attic flex runs to the far bedrooms that sag over the years. We reach Crestwood and Irondale quickly from our base on 15th Avenue North, and the rest of the metro every day.
Areas we cover most often
We repair and replace equipment from these manufacturers, plus most other makes.
Questions about ductwork repair and sealing in Birmingham
Rooms that never match the thermostat, dust around registers, ducts dripping in the crawlspace and bills rising on a healthy system are the usual clues. An inspection with static pressure readings shows whether the ducts are the cause or something else is to blame.
We seal metal joints with water-based mastic, sometimes over fiberglass mesh, and use foil tape made for ductwork where mastic does not suit. Flex is joined with proper collars and nylon straps. Sweating ducts get new insulation wrap with an intact vapor jacket.
Often, if the cause is a crushed, kinked or disconnected run, or a leaky boot. If the room is simply too far from the system or the duct is undersized, repair alone may not be enough, and we explain options such as balancing, a larger run or a ductless head.
Sealing supply and return leaks keeps conditioned air in the ducts and stops the return from pulling damp crawlspace air into the house. Fixing torn insulation stops the ducts from sweating. Moisture rising from the soil itself needs a vapor barrier or dehumidification as well.
Reattaching a single run or sealing a plenum often takes an hour or two. Sealing and re-strapping a full attic or crawlspace system usually takes most of a day. We give you the expected time along with the price.
Usually, yes. Chewed flex and nests in return ducts are common finds in crawlspaces and attics with open access. We repair or replace the damaged sections and point out the entry gaps we see, though sealing the house against pests is a separate job.
Related services and reading
- Ductwork ReplacementNew supply and return ductwork designed for the airflow your system actually needs.
- Hot and Cold Room FixesAirflow testing and balancing for rooms that never match the thermostat.
- Duct CleaningSource-removal cleaning after renovations, pests or years of dust and pollen.
- Whole-House DehumidifierDucted dehumidifiers that pull sticky Birmingham humidity out of the whole house.
- Sweating, leaking, crushed: duct trouble in older homesDuctwork guide
Need ductwork repair and sealing in Birmingham?
We answer 24/7. Tell us what the system is doing and we will tell you what happens next.