Spray Foam Insulation

Open Cell and Closed Cell Spray Foam

man spraying, spray foam insulationSpray foam is widely regarded as the best insulating material for buildings. Whether it is for commercial buildings accommodating offices or residential homes of family units, spray foam (also known as spray polyurethane foam, or SPF) is the superior material when compared to traditional ones, like fiberglass and cellulose. Insulation Wizards offers the best spray foam insulation for thermal and acoustic insulation purposes. It enhances energy efficiency by preventing thermal leakage through walls, reducing the cost of heating and cooling all year round. It also provides soundproofing for studio environments where people are unperturbed by outside noises SPF is a two-component foam as two separate chemicals react to form the foam instantaneously as it fired from a nozzle. SPF comes in two forms – open cell and closed cell foam. Insulation Wizards offer both varieties for our customers so you can decide which one you want to apply in your building. Of course, each comes with their own pros and cons and we want to be transparent with our customers by providing the benefits of each variant.


spray foam insulationOpen Cell Foam Features

  1. The microscopic cells of open cell foam are not entirely sealed. It is a good barrier to air, but it is not good at blocking water molecules. It permeates water, making it inferior to its closed cell counterpart.
  2. It has an R-value (a thermal resistivity parameter) of 6 per inch, which is already higher than other insulation materials. Open cell foam is also called low density SPF or half pound foam since it weighs roughly 0.5 lbs. per cubic feet.
  3. Open cell foam requires significantly less material to create, making it resource efficient and environment friendly. It is usually applied on interior walls as it provides good acoustic insulation but it is not applied outdoors since it has poor water resistance.
  4. Open cell foam is much cheaper than closed cell foam so when money is an issue or if you only require air resistance or airtight seals, then open cell foam is your go-to choice.

If you are concerned about cost and care about the environment, then Insulation Wizards recommends open cell foam for your insulation purposes. For indoor applications only, it is hands down the best insulation material.


spray foam insulation in between studs in a wallClosed Cell Foam Features

  1. Closed cell foam is a highly dense and tightly compressed foam in comparison to open cell foam. Due to its compact cell structure, it is impermeable to both air and moisture, making it water resistant.
  2. It has an R-value of 5 per inch, much higher than that of open cell foam. This makes it a superior thermal insulator. Closed cell foam is also called high density SPF or two pound foam because it weighs about 2 lbs. per cubic feet.
  3. Closed cell foam has high tensile strength, making it an excellent choice for reinforcing structural supports in walls. Hence, it performs two functions – provides topnotch thermal insulation and strengthens wall supports.
  4. As it is great for providing a good water barrier, it is frequently applied in outdoor applications, like on roofing materials.
  5. Closed cell foam is more expensive than open cell foam. If you are willing to invest money in very good insulation, then closed cell foam is your best option.


If you are willing to invest in very high quality insulation for maximum thermal and acoustic insulation, both indoors and outdoors, then Insulation Wizards recommends going for closed cell foam. It is your best bet, being more durable due to its water resistant property.

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