The Foundation of Energy Efficiency
You can have the best insulation in the world, but if air is leaking through gaps, cracks, and penetrations in your building envelope, you're still wasting energy and money. Air sealing is the critical first step to creating an energy-efficient, comfortable home or building.
Research from Oak Ridge National Laboratory shows that air infiltration accounts for 25-40% of heating and cooling energy loss. By sealing gaps around pipes, wires, ducts, chimneys, attic hatches, and other penetrations, we stop conditioned air from escaping and prevent outside air from infiltrating your home.
Professional air sealing works hand-in-hand with insulation—together, they create a complete thermal barrier that dramatically reduces energy waste and improves comfort throughout your property.
The Air Sealing Advantage
Lower Energy Bills Stop paying to heat and cool the outdoors. Air sealing reduces energy waste by 25-40%, resulting in lower utility bills year-round.
Improved Comfort Eliminate drafts, cold spots, and temperature inconsistencies. Air sealing creates more even temperatures throughout your home, making every room comfortable.
Maximizes Insulation Performance Insulation works best when air can’t bypass it. Air sealing ensures your insulation performs at its rated R-value by preventing air movement through and around it.
Better Indoor Air Quality Reduce allergens, dust, pollen, and outdoor pollutants from entering your home. Air sealing creates a controlled environment with cleaner indoor air.
Prevents Moisture Problems Air leaks carry moisture into wall cavities and attics, leading to condensation, mold, and structural damage. Proper air sealing prevents these costly problems.
Quieter Home Sealed gaps and cracks reduce outside noise infiltration, creating a quieter, more peaceful indoor environment.
Extended HVAC Life When your heating and cooling system doesn’t have to work as hard to maintain temperature, it lasts longer and requires fewer repairs.
Where Air Leaks Happen
Attic Penetrations
- Recessed lighting fixtures (can lights)
- Plumbing vent pipes and stacks
- Electrical wiring penetrations
- HVAC ductwork boots and registers
- Chimney chases
- Attic access hatches and pull-down stairs
- Whole-house fans
Walls & Ceilings
- Top plates (where walls meet the attic)
- Bottom plates (where walls meet the floor)
- Electrical outlets and switch plates
- Around door and window frames
- Where interior walls meet exterior walls
Basement & Crawl Space
- Rim joists (band joists)
- Foundation sill plates
- Crawl space access doors
- Ductwork penetrations
- Plumbing and electrical penetrations
Other Common Leaks
- Around fireplace dampers
- Dryer vents
- Exhaust fan housings
- HVAC closet doors
- Gaps around exterior doors and windows
Professional Air Sealing Solutions
Spray Foam
- Expanding foam sealant for larger gaps (1/4″ to 3″)
- Creates airtight, insulated seal
- Ideal for rim joists, large penetrations, attic bypasses
Caulk & Sealants
- Flexible sealants for small cracks and gaps (less than 1/4″)
- Used around window/door frames, electrical boxes, small penetrations
- Weather-resistant formulas for durability
Weatherstripping
- Compressible seals for moving parts (doors, windows, attic hatches)
- Prevents air leakage while maintaining functionality
Rigid Materials
- Foam board or sheet metal for larger openings
- Sealed with spray foam or caulk around edges
- Used for attic hatches, large chases, oversized penetrations
Specialty Solutions
- Can light covers for recessed lighting
- Chimney chase sealing
- Ductwork sealing with mastic (not tape)
- Insulated access door systems
Our Air Sealing Process
1. Free Evaluation We inspect your attic, basement, crawl space, and other areas to identify air leakage points. We can also perform a blower door test (optional) to measure total air leakage and prioritize sealing locations.
2. Custom Sealing Plan We’ll identify the most significant air leaks in your home, explain which areas will provide the greatest energy savings, and provide transparent pricing for comprehensive air sealing.
3. Professional Air Sealing Our crew seals all identified leakage points using appropriate materials and techniques. We work systematically through your home, addressing attic bypasses, penetrations, rim joists, and other critical areas.
4. Insulation Installation (If Needed) Air sealing is most effective when done BEFORE adding or upgrading insulation. We can complete both services back-to-back for maximum energy savings.
5. Verification We inspect completed work to ensure all gaps are properly sealed. If a blower door test was performed initially, we can retest to document improvement in air tightness.
Air Sealing Works Best with Proper Insulation
Air sealing and insulation are a powerful combination. Here’s why they work together:
The Right Sequence Matters Always air seal FIRST, then insulate. This ensures access to all penetrations and prevents conditioned air from bypassing insulation through gaps and cracks.
Combined Energy Savings Air sealing alone can reduce energy loss by 25-40%. Adding proper insulation on top of air sealing can reduce heating and cooling costs by 20% or more (DOE). Together, the savings compound dramatically.
Spray Foam Does Both Spray foam insulation acts as both insulation and air barrier in one application. For attics, crawl spaces, and rim joists, spray foam provides the most complete solution.
We Handle Both Southern Seal provides complete air sealing and insulation services. We can seal your home and install insulation in the same project, delivering maximum energy efficiency and comfort.
Air Sealing FAQs
Considering air sealing for your home? We've answered the most common questions about air sealing, from costs and energy savings to what's involved in the process. Don't see your question here? Give us a call—we're happy to help.
Book a Free EvaluationHow much does air sealing cost?
Professional air sealing typically costs $1,500 to $4,000 for a whole-house approach, depending on home size, accessibility, and extent of air leakage. Attic-focused air sealing (the most critical area) costs $800-$2,000. We provide detailed estimates during your free evaluation and often bundle air sealing with insulation installation.
How much can air sealing save on energy bills?
Air sealing can reduce heating and cooling energy loss by 25-40% (EPA/Oak Ridge National Laboratory). For the average Metro Atlanta home, this translates to $300-$600 per year in energy savings.
Should I air seal before or after insulating?
Always air seal BEFORE adding or upgrading insulation. This ensures access to all penetrations and prevents air from bypassing insulation through gaps. If you already have insulation, we may need to remove some to properly seal, then replace it.
What is a blower door test?
A blower door test measures your home’s total air leakage by depressurizing the house and measuring airflow. It helps identify where leaks are located and quantifies improvement after air sealing. We can perform this test as part of your evaluation.
Will air sealing make my house too tight?
No. Modern homes need proper ventilation, but that should be controlled (bathroom fans, kitchen exhaust, HVAC fresh air intake)—not through random leaks. Air sealing stops uncontrolled air infiltration while maintaining healthy indoor air quality.
Can I do air sealing myself?
Some simple air sealing (caulking around windows, weatherstripping doors) is DIY-friendly. However, attic bypasses, rim joists, and hard-to-reach areas require professional equipment, knowledge, and often insulation removal for access. Professional air sealing is more comprehensive and effective.
How long does air sealing take?
Most air sealing projects take 1-2 days, depending on home size and scope. Attic-focused air sealing can often be completed in 4-6 hours.
Does spray foam insulation eliminate the need for air sealing?
Closed-cell spray foam acts as both insulation and air barrier, eliminating the need for separate air sealing in the areas where it’s applied. However, other areas of your home may still need traditional air sealing methods.
Ready to Stop Wasting Energy?
Air sealing is one of the most cost-effective energy improvements you can make. Stop paying to heat and cool the outdoors—seal your home and start saving today.
Schedule your free evaluation and discover where your home is losing energy.
Service Areas
Proudly serving Metro Atlanta including: Alpharetta, Atlanta, Brookhaven, Cumming, Duluth, Johns Creek, Kennesaw, Lawrenceville, Marietta, Milton, Roswell, Sandy Springs, Suwanee, and surrounding areas.
Explore Our Other Insulation Services
Insulation Health Check
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Insulation Removal
Old, damaged, or contaminated insulation? We'll safely remove it and install fresh, effective insulation.
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Batt Insulation
Traditional, reliable insulation perfect for new builds and renovations. Choose from fiberglass or mineral wool.
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