I have an owner that was going to include open cell spray foam in the 2×6 exterior walls of his addition until someone mentioned to him that “insects like to burrow and inhabit spray foam”.  I know that is an all-encompassing statement versus the types and formulations of spray foams available, but I wanted to reach out to anybody with experience with this.  As the designer I have no skin in the game whichever way the owner goes, but I had not heard of the issue being more than a one-off problem from time to time.  The project is new construction close to the edge of a pond in Massachusetts.  Any suggestions for the owner?  Any specific details or products to retard the issue beyond borate additives in the sill plate?