How much does 2# foam expand?

How Much Does 2-Pound Pour Foam Expand?

Two-pound density polyurethane pour foam is a closed-cell marine foam commonly used for flotation, insulation, and filling voids. When mixed properly, it undergoes a chemical reaction that causes it to rapidly expand.

Expansion Volume

• Mixing 1 gallon of Part A with 1 gallon of Part B yields approximately 9 cubic feet of expanded foam.
• This is based on a 2 lb/cu ft density, meaning the foam is lightweight yet strong enough for most marine and structural applications.

Usage Tips

• Measure both parts accurately by volume for consistent results.
• Mix quickly and pour immediately, as expansion starts within seconds.
• Ensure adequate working space — the foam will grow significantly.
• Work in a well-ventilated area and follow all safety instructions.

At Fiberglass Florida, we stock 2 lb and 4 lb pour foams for marine, automotive, and construction projects. Click here to shop pour foam now.