Closed cell spray foam insulation is applied to fill the gaps between the deck i-beams.A smaller foam application pre-fills gaps.The first pass with the sprayer fills the corners helping to make the insulation airtight.Spray foam expands to fill the gap between the overhanging deck soffit and the foundation. This helps create an airtight seal between the deck and the foundation.The spray foam curing in place after the first application. Two applications were made on different days to fill out the thickness of the cavity.LVL’s are glued, screwed and sealed in place to finish the deck perimeter.