AirSealing America, LLC is a residential building performance contractor.
Based in Concord, MA, we provide services to clients in Massachusetts and southern New Hampshire.  Our services include airsealing, insulating and radiant barrier installation (to reduce summer time heat gain from the attic). 

We provide air leakage testing using a blower door and Infrared scanning, and test the safety of the home through combustion safety testing.  Once testing is complete, we can proceed to airseal and insulate a home's attic, walls and cellar.  Energy efficiency is improved.

AirSealing America, LLC was contacted on behalf of the town of Concord, MA and asked to participate in the "green your heat Concord" program.  Contact us for more information.

Most homes leak air and drive up utility bills as a result. The annoying leaks around windows and doors pale in comparison to the hidden leaks (thermal bypasses) in attics, basements and walls.  Read what Fine Homebuilding Magazine has to say about bypasses.

(contrary to popular belief, a home doesn't need to "breathe";  however, it does need to have a minimum amount of ventilation to bring fresh air in and allow pollutants such as water vapor, odors and other gases to escape.  Spot ventilation via bath fans and kitchen fans can help.)

Using the home-as-a-system approach, AirSealing America, LLC, will evaluate the amount of air leaking into (or out of) your home using a calibrated  blower door and a sophisticated manometer to measure air flow and pressure differences in the home. 

From these measurements and measurements of your home's volume (the square footage of your home multiplied by the height), the home's "Building Airflow Standard", or BAS, is calculated.  The blower door readings determine whether there are opportunities to "tighten up" the home, and helps determine where the leakiest areas are.

The opportunity to tighten up a home against costly air leaks is only taken if, using the building-as-a-system approach, it can be done safely;  therefore, we run an extensive battery of combustion safety tests to ensure that your appliances such as furnace, boiler, water heater and clothes dryer, will continue operating safely after the amount of air leakage is decreased.​

In the attic, penetrations through the attic floor (for electric wires, plumbing pipes and chimneys) as well as wall caps/top plates and pull down attic stairs are pathways that allow warm air from your home (in winter) to escape to the cold attic.  The process reverses in the summer and brings warm air into your home.  If you use air conditioning, the unit has to work that much harder to overcome the infiltration of hot, humid air.

After the airsealing is done, our crew will blow cellulose insulation into the attic space to a uniform depth, thereby filling all empty cavities and achieving a uniform R-value to your attic. 

Go from this (open wall caps; chimney chase open to cellar)

Icicles indicate poor airsealing, poor insulation, poor ventilation or all three!  The heat you're paying to warm your home is melting the snow on your roof, causing icicles and ice dams.  We will evaluate your home and make airsealing and insulation recommendations. 

Air Duct leaks are another cause of high heating (and air conditioning) costs. 
Uninsulated air ducts in unconditioned spaces (cellars, attics) can waste 50% of the energy you paid for.  Duct seams must be sealed and the duct must be wrapped in duct insulati on.

Contact us for a free estimate to air seal and insulate your home.

Seal up the gaps...Seal in the Savings

Don't Just Insulate - Airseal, then Insulate...Why?
Insulation slows heat loss by holding the heat in air pockets between the fibers.  If there's air movement through the insulation, the heat is lost and the R-value of the insulation is reduced.
With the blower door fan running, it's easy to feel the air leakage in a home - and it is a useful tool for determining where the biggest leaks are in a home (it's usually not the windows).

On its own, insulation is little more than an air filter.  Block the airflow through the insulation by proper airsealing techniques and then the insulation can do its job! 

 Icicles are pretty...Pretty Expensive!

To this (sealed wall caps & chimney chase. Ventilation baffles, joist cavity blocking and cellulose insulation installed)​