Air Duct Cleaning Services › Duct Sealing Service
Duct Sealing Service in Alexandria, VA
Duct sealing closes gaps, separations, and failed connections in your duct system using mastic compound or metal tape — not the cheap duct tape that dries out. Leaky ducts push conditioned air into your attic, crawlspace, or wall cavities instead of your living rooms. You pay to heat or cool space you never use. Sealing fixes that at the source.
Alexandria Air Duct Pros provides duct sealing service for homeowners across Alexandria, VA. Call for a free inspection and a written quote before any work begins.
When to Call
When You Need Duct Sealing Service
- One bedroom in your Alexandria townhouse stays 5 degrees warmer than the rest, no matter what the thermostat says.
- Your utility bills climbed significantly after an HVAC replacement but your contractor has no explanation.
- You can hear air hissing near a flex duct connection in your attic or basement.
- A home energy audit flagged duct leakage as your biggest source of efficiency loss.
How It Works
Our Process for Duct Sealing Service
- 1
Leak Detection
We pressurize the duct system and use airflow testing to locate where leakage is worst — not just visible gaps.
- 2
Joint Preparation
Surfaces around leaky joints are cleaned so sealant bonds properly. Dirty or greasy surfaces cause sealant to fail early.
- 3
Mastic Application
We apply UL-listed mastic compound or foil tape to each identified leak point. Every sealed joint gets a second pass inspection.
- 4
Post-Seal Verification
We retest system pressure after sealing to confirm leakage is reduced to an acceptable level before we pack up.
Alexandria Context
Why this matters in Alexandria
Many Alexandria homes with flex duct systems installed in the 1990s have connections that have pulled loose or dried out over time. Northern Virginia's temperature swings accelerate joint failure, making sealing a practical fix rather than an optional upgrade.
Straight Talk
About pricing & scope
Price is driven by how many leaks we find and how accessible those sections of ductwork are. Crawlspace or attic runs take longer to reach and seal than exposed basement ductwork.
What This Fixes
Problems We See in Alexandria
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