The building code in Massachusetts has changed several times over the last few years.  One of the biggest changes has been in the area of energy efficiency.  The new building code requires barriers against both heat loss and air infiltration, which can be very hard to acheive with traditional fiberglass insulation. One of the best solutions we have found has been Closed Cell Foam insulation.  Closed Cell Foam has a very high R-value, and creates an almost impenetrable barrier against water, moisture, and air infiltration.  We began using closed cell foam about 4 years ago and the performance has been exceptional. 

    One of the drawbacks of this type of insulation is that it creates such a tight building envelope, that it can prevent fresh air exchange in a home.  To eliminate this problem, we always recommend a heat recovery ventilator, also known as an air exchange system, that mechanically removes stale air and replaces it with fresh air from outside. 

Here are some of the other benefits of Closed Cell Foam:

1. Stiffens the structual frame of the home
2. Only insulation approved by FEMA for flood-resistant construction
3. Insect resistant
4. Low permeability and moisture absorption rates.

So if you are thinking of Building, Remodeling, or Renovating on Cape Cod, you should definitely look into Closed Cell Foam Insulation for your next project. 

Here is a brief article  from coastalcontractor.net on the subject that talks further about the benefits:  Closed Cell Foam