We are framing stages now, so exciting... I was asked by the builder today if I'd like to upgrade my insulation from R21 with poly wrap vapor barrier for the sidewalls to blown cocoon spray. He is asking $1700 for this upgrade. The house is 2800 sq feet and in Upstate NY with cold winters. Is this upgrade with it. Is $1700 too much for this. Thanks for any with any experience or advice.