Closed Cell Foam Insulation – Texas Home

By: Heidi Brunet (Modern-Shed Dwelling Owner, Dallas, TX)

According to the US Dept of Energy, air infiltration can account for 30% or more of a home’s heating and cooling costs. Traditional types of insulation allow air leakage throughout your home. This draftiness is responsible for high heating and cooling costs, an uncomfortable home during the summer and winter months, and allows allergens to freely accumulate in your home.

To maximize energy efficiency, I chose to use 2 inches of closed-cell spray foam insulation in combination with rockwool, a green insulation made mostly from rocks and minerals. Rock wool insulation contains 70-75% recycled content. 

Why closed cell foam insulation?

  • First, its high R-Value which provides outstanding thermal performance, so it minimizes hot and cold spots that can affect the efficiency and comfort of a home.
  • Second, its rigidity provides added structural integrity to your walls.
  • Third, it acts as a secondary moisture vapor barrier to help reduce the risk of moisture or mold in the walls, roof and crawl space of the house.

This insulation combination (closed-cell spray foam and rockwool) will achieve… 

R-value of R-28 in the 2×6 exterior walls [R-13 (closed cell) + R-15 (rockwool)]. Compare that to traditional fiberglass insulation of R-11 to R-15. The higher the R-value the better – the higher the R-value, the greater the insulating effectiveness.

R-value of R-39 in the 2×10 roof panels [R-13 (closed cell) + R-26 (rockwool)]. 

The combination of energy efficient spray foam and rockwool insulation will provide excellent insulation, save on energy cost, protects against moisture reducing the chance of mold or mildew, provide excellent sound control and superior indoor air quality.

To see the most recent photos of the Modern-Shed dwelling, visit:

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2 Responses to Closed Cell Foam Insulation – Texas Home

  1. Jeff says:

    Heidi, I would also add this to your list of benefits – that rockwool is fire resistant, and very easy to install. Overall I really think you nailed it with that combination.

  2. You have added quite informative and useful post about closed cell foam insulation, nice to read that for maximize energy efficiency, you chose to use 2 inches of closed-cell spray foam insulation in combination with rockwool. I want to say thanks for sharing your thoughts about insulation…..

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