Triple H used a two-part expanding spray foam for the rim joist of this Farmingdale, NY home.Spray foam was installed on rim joist and over sill plate to seal all air leaks from the outside and insulate this important area of your home. Dr. Energy Saver’s spray foam has a high insulation value per inch. When it expands, it seals all cracks and gaps and joints where air from the outside enters your home. Insulating your rim joist properly results in warmer floors, less drafts, more comfortable rooms, and your home is easier to heat and cool when needed.