Can you paint spray foam instead of covering it with drywall? Regular paint doesn't count as a spray foam thermal barrier. However, some specialty coatings are tested as fire barriers for specific foam products and may be accepted when they meet CAN/ULC-S124 or have an approved evaluation. The key is making sure the coating is approved for your exact foam product and application, and that your local building official accepts it. Our guide explains when coatings may be an option and when traditional materials like drywall or plywood are the better choice. Read more: https://westerninsulation.ca/spray-foam-thermal-barrier-bc/