ductwork on the left has mastic on the seams. Finished insulated duct is on right.

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 up to 60% of the energy you paid for.  Duct seams must be sealed and the duct must be wrapped in duct insulation.


Contact us for a free estimate for airsealing, insulation and weatherization of your home.

This leaky duct needs to be sealed.

Seal up the gaps...Seal in the Savings with airsealing

After the airsealing is done, we 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)

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

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.
















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!



Hand in hand with airsealing is maintaining proper ventilation of the attic.  If a house has soffit vents, the air coming in must be directed up the roof, and not through the insulation.  Watch the video to the left to see how we do that.

AirSealing America, LLC is a home 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 also provide air leakage testing using a blower door and Infrared scanning, and combustion safety testing at the beginning and end of the project for safety.  


Home energy efficiency is improved.


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.

We've all heard that a home needs to "breathe";  however, most homes breathe like a fire-breathing dragon, losing valuable heat to the attic, cellar and through walls.  We will calculate the proper amount of ventilation for your home.