What is NEX-FOAM? The NEX-FOAM Insulation SystemNEX-FOAM, the leading soft foam insulation and air barrier system, is becoming the industry standard for providing maximum building envelope performance. NEX-FOAM&＃39;s pour and spray formulations represent a breakthrough in the science of moisture and thermal management.NEX-FOAM is the leading 100% water-blown foam insulation that minimizes air leakage for increased energy efficiency, creates a healthier indoor environment, reduces airborne sounds and offers greater design freedom. NEX-FOAM maintains its performance with no loss of over time. It does not shrink, sag or settle. NEX-FOAM adheres to most construction materials and is the perfect insulation for walls, attics, ceilings and floors.