Air Sealing Techniques: Why It Matters, How It Works, and DIY Tips for Homeowners

When Massachusetts homeowners think about energy efficiency, insulation is usually the first upgrade that comes to mind. But an equally important part of home performance is air sealing. Air sealing and insulation work together to improve comfort, reduce drafts, and lower energy bills, yet they serve very different functions.

Understanding these differences can help you make better decisions for your home and maximize the benefits of the no-cost Home Energy Assessment available through the Mass Save® program.

Air Sealing vs. Insulation: What’s the Difference?

Air Sealing Prevents Uncontrolled Airflow

Air sealing targets the cracks, gaps, and penetrations that allow conditioned indoor air to escape and outdoor air to enter. These leaks often occur in hidden or hard-to-reach areas such as:

• Attic penetrations and recessed lighting

• Chimney chases

• Pipe and wire openings

• Rim joists and basement sills

• Attic hatches and kneewalls

If left unsealed, these openings cause drafts, uneven temperatures, and higher heating and cooling costs because your HVAC system must work harder to keep up.

Insulation Reduces Heat Transfer

Insulation slows the movement of heat in and out of your home. Common materials include:

• Blown-in cellulose

• Fiberglass

• Spray foam

• Rigid foam board

Insulation is essential for comfort and energy efficiency, but it cannot block air movement by itself. If air is flowing through or around insulation, its R-value drops dramatically. This is why Mass Save® requires air sealing before insulation upgrades.

Why Air Sealing Is Critical for Energy Efficiency

Even a well-insulated home may lose up to 30% of conditioned air through unsealed gaps and cracks. Effective air sealing:

• Reduces drafts throughout the home

• Improves temperature consistency between rooms

• Lowers heating and cooling bills

• Enhances indoor air quality

• Allows insulation to perform at its full rated value

For many older Massachusetts homes, air sealing is one of the most cost-effective upgrades available.

Rogers Insulation completes no-cost professional air sealing as part of the Mass Save® Home Energy Assessment, ensuring leaks are properly identified and sealed.

DIY Air Sealing Tips for Homeowners

While professional air sealing provides the biggest performance improvements, there are several simple, low-cost upgrades homeowners can do themselves.

Weatherstrip Exterior Doors

Apply V-strip, foam, or rubber weatherstripping to seal gaps around:

• Entry doors

• Bulkhead doors

• Attic access hatches

This is often the quickest way to stop drafts.

Seal Window Gaps

Use:

• Clear interior caulk for stationary seams

• Rope caulk for temporary or seasonal sealing

• Window insulation film for winter months

These methods help maintain consistent indoor temperatures.

Install Outlet and Switch Gaskets

Exterior-wall outlets often leak air. Foam outlet gaskets are inexpensive and easy to install behind switch plates.

Seal Plumbing and Cable Penetrations

Use caulk or spray foam around gaps where pipes, cables, or wires penetrate walls or floors. Common locations include:

• Under sinks

• Behind toilets

• Where outdoor spigots enter the house

• Cable or utility connections

Check Basement and Rim Joists

The rim joist area is one of the most common sources of cold drafts in New England homes. Sealing gaps here can immediately improve winter comfort.

Professional Air Sealing Through the Mass Save® Program

A professional energy assessment uses diagnostic tools such as blower-door testing and thermal imaging to locate leaks you cannot see. Through Mass Save®, eligible homeowners receive:

• No-cost professional air sealing

• Generous rebates for insulation upgrades

• Access to 0% HEAT Loan financing

• A tailored energy efficiency plan based on the home’s needs

Rogers Insulation’s certified technicians complete all work directly, ensuring high-quality results and measurable improvements.

Why Homeowners Trust Rogers Insulation

• Over 45 years of expertise in insulation and air sealing

• Accredited Mass Save® partner

• Specialists in blown-in cellulose and building-shell diagnostics

• Proven improvements in home comfort and energy savings

• Professional, clean installation trusted by thousands of homeowners

Take the First Step Toward a More Comfortable, Efficient Home

If your home feels drafty, unevenly heated, or expensive to operate, air sealing is one of the most effective upgrades you can make. The best place to start is with a no-cost Mass Save® Home Energy Assessment.

Call us today to schedule your appointment.