New insulation will not help if air still blows through the ceiling.
Plenty of Houston homes have insulation but still feel drafty upstairs, because air moves through can lights, attic hatches, and gaps at the top plate. Our Search & Seal crew finds those leaks and closes them before or with an insulation upgrade. Residential and commercial. Pasadena-based. Call 409-316-9957.
Contact us
Not sure what you need? That is normal. Tell us what you are seeing. We call back with plain answers, no jargon, no pressure to sign.
Quick answer
Usually yes. Sealing the attic plane first stops hot, humid air from pushing through blown-in insulation or whatever you add on top of it, so the new material performs the way it's rated to.
Quick answer
Closing gaps at the attic floor and ceiling plane, hatch, recessed lights, duct boots, bath fans, and top plates. It stops hot, humid attic air from entering living space and cuts the load on your AC.
Dust puffing from can lights when the AC runs often means attic air leakage.
Sealing alone can help; sealing plus attic depth is stronger.
Humid attic air at the ceiling can contribute to condensation and mold risk if left open.
We use fire-rated materials at recessed lights where code requires it.
Air sealing closes holes and gaps in the building shell, not the same as adding inches of insulation. We use fire-rated foam, caulk, and gaskets where codes require them, focused on the attic floor and other high-leak zones.
You need air sealing when you feel hot spots near recessed lights, smell attic air in hallways, or an audit showed high infiltration. Also smart before blowing insulation on top of a leaky deck.
Less dust puffing from can lights when the AC runs. Upstairs may track downstairs closer. On its own, sealing helps; with new attic insulation, the combo is stronger.
Related on this site
Services: Blown-In Attic Insulation, Spray Foam Insulation, Attic Fan & Ventilation
Guides: Air Sealing vs. Insulation: What to Fix First
Areas we serve: Clear Lake, Pasadena, Seabrook, Pearland · all locations
Air sealing targets airflow through the ceiling, the boundary between conditioned space and the attic. Humid outdoor air wants in. Every penetration at the ceiling is a straw: cans, duct boots, bath fans, the hatch. In summer, that air carries heat and moisture into your home and adds load on your HVAC. Sealing is often the highest-impact step on older homes with dozens of can lights and a loose attic hatch.
0%
Attic
0%
Walls
0%
Windows
0%
Doors & Other
Air sealing is the airflow control layer of the envelope. It stops hot, humid attic air from reaching conditioned space through cans, hatches, chases, and duct penetrations. Insulation is the heat-control layer. Houston homes need both when leaks are driving AC strain and indoor comfort problems.
After sealing we often add blown-in attic insulation or spray foam for the thermal layer.
Sealing and insulation address different layers of the building envelope. Many Harris County and Fort Bend County homes need both, but the order matters. Compare below, then see our attic R-value guide for Houston for depth targets.
| Factor | Air sealing (Search & Seal) | Insulation only |
|---|---|---|
| What it fixes | Gaps at cans, hatches, plates, ducts | Thin or missing thermal depth |
| Stops airflow | Yes — primary purpose | Slows heat; does not seal gaps alone |
| Humid attic air | Blocks paths into living space | New fill can still filter air if leaky |
| Typical cost | $800–$2,500 residential | $1,200–$2,000+ blown-in attic |
| Best when | Dust at cans, drafty hatch, new build leaks | Joists visible, under R-38 depth |
| Recommended order | First (or with blow-in same visit) | After sealing when depth is still low |
Pair sealing with blown-in to R-38–R-60 or compare spray foam vs blown-in when the attic is both leaky and thin.
Leaks
We mark problem spots instead of guessing.
Comfort
Upstairs often evens out when ceiling leaks close.
Humidity
Blocks humid attic air from entering living space.
Combo
Best results with attic depth added after sealing.
Leaks
Why does dust puff from can lights?
Comfort
Can sealing fix hot upstairs bedrooms?
Humidity
Does sealing reduce muggy indoor air?
Combo
Seal first or add insulation first?
Homes with can lights, pull-down stairs, and ductwork in unconditioned attics, typical in Pearland and Clear Lake subdivisions from the 1980s and 1990s.
Get Residential QuoteOffice plenums, warehouse ceilings, and retail suites where infiltration drives HVAC runtime.
Commercial Services →We can test visually and seal the worst paths first. Written scope before work starts.
Free inspection. No obligation.
Or call: 409-316-9957
Attic walk with you; note hatches, cans, chases, and plates.
Prioritize high-flow paths; quote materials and labor.
Fire-rated products where required; protect finished areas.
Recommend insulation depth or foam if the attic still needs R-value.
Air sealing in Houston typically runs $800–$2,500 depending on home size and how many penetrations we treat. Often bundled with attic insulation.
Insulation services across 23 Greater Houston communities
Genuine customer reviews on drafts stopped, energy comfort, and thorough attic inspections.
Amy Karlson
"Working with USA Insulation has been fabulous. We have used them to foam our entire house, from our attic to our walls to underneath the floors. It has made a big difference in keeping the moisture out of our waterfront home. As installers, they were communicative, responsive and able to flex with our other contractors, and I appreciate their knowledge, their advice and their attention to detail (and clean-up). I give them the highest possible recommendation there is. Thanks to all: Tim, Andy, Henry, Zee and all the installers! A+++ Just a few pictures of the foam right after it was pumped into our ceilings beneath the house!"
"Amy Karlson, thank you so much for this incredible feedback! We're glad the foam insulation made such a noticeable difference in helping manage moisture throughout your waterfront home. It was a pleasure working on your Pasadena home and coordinating with your other contractors, and we're especially grateful that you noticed our communication, knowledge, and attention to detail. Tim, Andy, Henry, Zee, and all of our installers truly appreciate your kind words and recommendation for USA Insulation Houston!"
Often because air still moves through can lights, the attic hatch, and duct gaps. New insulation alone can't block that airflow, air sealing closes those paths.
Our Search & Seal process locates and seals attic air leaks at the ceiling plane, the cans, hatch, duct boots, and top plates that let conditioned air escape. It's typically done before adding new insulation depth.
Before, when possible. Sealing first keeps humid Houston air from moving through new insulation material.
Yes. Scope depends on ceiling type and access. Call 409-316-9957 for a walkthrough.
Often $800–$2,500 for residential attics. We quote after an on-site inspection.
It can reduce humid air moving into conditioned space and condensing on cool surfaces. Active roof leaks must be fixed first. We do not add insulation over wet material.
Yes. We provide Search & Seal air sealing throughout Greater Houston, including Pearland, Pasadena, and Clear Lake, as a standalone service or as part of a larger insulation upgrade.
Independently owned USA Insulation franchise · National brand since 1985 · Locally owned since 2023 · Local Pasadena crew · usainsulation.net/houston
