Spray foam insulation types include open cell and closed cell foam insulation.  The following is a summary of their differences.

Open cell:

  • Cells are not completely closed
  • Foam is lightweight
  • Foam provides and air barrier
  • Less expensive than closed cell
  • Higher R value
  • Doesn’t provide a vapor barrier

Closed cell:

  • Foam cells are completely closed
  • Foam is higher density
  • Provides a vapor barrier
  • More expensive
  • Lower R Value

Open cell insulation is lightweight foam and is the less expensive option of the two.  It stays soft and flexible.  Closed cell spray foam is a higher density product and becomes hard and durable when cured.  it is a more expensive product that also serves as a moisture barrier.  It is more suitable for basements and under-grade application than open cell foam.

Open cell spray foam insulation type can be used for homes or business structures and is a great option for attics and non-vented crawl spaces.  It out performs fiberglass batting insulation by  to 4 times as it expands into place.  And, importantly, it will not sag or lose its loft over time.

Closed cell spray foam insulation type has an R-value of nearly 6.8 per inch.  It is rigid structurally and can add strength to walls.  It can provide a vapor barrier when install in all wall cavities and deters the growth of mold and mildew.  It should last the lifetime of a home without sagging or shifting.