The Multiple Benefits of Spray Foam Adhesive


Make Resilient Upgrades | Strengthen Your Home • Hurricanes | Tornadoes

Why does it matter?

Closed-cell spray polyurethane foam insulation applied to the underside of the roof deck can seal your deck, create a secondary water barrier, strengthen the roof deck connections to increase wind resistance, and improve energy efficiency.

What do I need to know?

Spray foam adhesive comes in two forms: closed or open cell. While both provide a measure of increased R-value and wall insulation, closed cell provides better heat resistance, second water barrier benefits, and enhanced strengthening properties that reinforce the roof deck attachment.

  • Properly applied spray foam adhesive is an impermeable insulation. Controlled air permeability helps to prevent and control bulk water entry, and this creates a sealed roof deck.
  • Spray foam adhesive serves as a secondary water barrier to keep water out of your attic.
  • Spray foam provides support against wind uplift and racking by making connections stronger.
  • Spray foam saves energy by increasing R-value.

Where do I start?

Identify a licensed, bonded, and insured professional who is certified to install spray foam. Apply a 3” minimum, full insulating layer of closed-cell polyurethane foam adhesive between roof rafters/trusses and on the underside of decking at all points of framing and sheathing intersections.

More Resources:

  • FLASH. Resilient Design Guide: High Wind Wood Frame Construction Edition



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