Open Cell Spray Foam


Foam-Lok 500 (FL500) is a half pound density open cell foam that creates an air seal undetectable by human senses. FL500 is a 2-part spray applied polyurethane cellular foam plastic. The product is sprayed on as a liquid, expands, and cures within minutes. The major differences between FL500 open cell foam and FL2000 closed cell foam are as follows:

  • Aged R-value of 3.9 per inch of depth (Closed Cell is 6.3 (aged) per inch)
  • Vapor Barrier (Open Cell is a vapor retarder; Closed Cell is a vapor barrier)
  • Structural (Open Cell is soft like angel food cake; Closed Cell is almost as hard as wood)
  • Less Expensive (more materials are needed to produce an "R" of Closed Cell)

Although FL500 is suitable for almost any use, our typical installs of this product include:

  • Residential homes
  • Areas where space is not an issue (i.e. attics - new and existing)
  • Sound attenuation
  • Wood Surfaces

Our Open vs. Closed Cell Foam page is a great source for an even more detailed comparison of the products. Remember, if you're confused, just contact us. We work with these products every day!