Airtight Foam Energy Solutions Inc. Insulation is so effective because it is applied as a liquid and expands in seconds. As it expands, it conforms and fills each cavity, crevasse and void to create a sealed thermal envelope. Airtight Foam Energy Solutions Inc. creates a highly-efficient seal against air infiltration, the number one source of energy loss in a structure. This innovative insulation adheres to any clean, dry surface and will not sag, settle or disintegrate.