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Spray Foam Solutions for Your Crawl Space

Spray Foam Solutions for Your Crawl Space

March 22, 2019

spray foam solutions for your crawlspace

As native Texans, we can’t imagine living anywhere else. From the bluest skies and open planes to the legendary Dallas skyline, Texas offers beauty in many forms. With that being said, the extreme temperatures in our great state can offer some not-so-beautiful energy bill costs. Especially for homeowners who have a crawlspace, it can be a struggle to keep your home temperature regulated without raising your energy bill. Luckily, the pros at DFW Thermal Solutions know the struggle is real and are here to help with some spray foam solutions for your crawl space!

Types of Spray Foam Insulation:

When choosing the best spray foam solution for your crawl space, you should weigh the pros and cons of open-cell foam and closed-cell foam. Here are some of each to consider:

Open-Cell Foam –

This foam is soft and spongy in texture. Full of cells that deliberately remain open, this type of foam is incredibly flexible.


  • Easy installation – Because open-cell foam expands to twice the thickness as closed-cell foam, only one application is necessary in most standard walls.
  • Flexible for Hard-to-Reach Areas – Another benefit of open-cell foam is its ability to expand and fill those nooks and crannies in wall and ceiling cavities.
  • It is Cost-Effective – In addition to easier installation, this foam is much less expensive to make and install than closed-cell foam.
  • Excellent for Soundproofing – With a single application of open-cell foam, you can completely fill the area between studs, allowing for better soundproofing of the space.
  • Safer Blowing Agent – An important aspect to look at when choosing your foam spray is the type of insulating gas, or blowing agent, it uses. Unlike a closed-cell foam spray that uses a chemical agent, an open-cell foam uses water as its blowing agent.


  • No Vapor Barrier – Although this can be considered an advantage in some cases, the lack of water-resistance in an open-cell foam can make it a less effective insulation choice for spaces prone to moisture.
  • Lower Heat Resistance – In addition to lacking a vapor barrier, an open-cell foam has a lower level of heat resistance, or R-value. Therefore, open-cell foam insulation can fail in the event of extreme temperatures.  

Closed-Cell Foam –

Contrary to an open-cell foam, this foam is more rigid and stable in texture. Remaining completely closed, the cells are pressed together so heat and moisture are unable to penetrate the foam.


  • High R-Value – Unlike an open-cell foam, a closed-cell foam has a higher R-value per square inch. This makes closed-cell foam more heat resistant.
  • Offers a Vapor Barrier – Because closed-cell foam is resistant to water penetration and moisture build-up, it can help prevent hazardous mold growth.
  • Better for Insulating Air – With its denser texture, a closed-cell foam can insulate air, preventing drafts and containing regulated temperatures indoors. This temperature control will cut down on the humidity levels and reduce potential mold growth.
  • It Can Strengthen Walls – Another benefit of the dense texture of a closed-cell foam is its ability to strengthen walls to which it is applied.
  • Gravity-Defying Application – With its dense texture, closed-cell foam can defy gravity and provide a thicker hold when applied to tricky areas like your crawl space walls.


  • Higher Cost – Not only is closed-cell foam spray more expensive to make but must be applied in thinner coats in several layers, driving up installation time and overall cost.
  • Less Expansion and Flexibility – As previously explained, closed-cell foam must be applied in several thin coats. Because closed-cell foam has minimal expansion and flexibility when applied, it is less effective in filling hard-to-reach voids.

Which One is Best for My Crawl Space?

Our Recommendation: Closed-Cell Foam Spray – Your crawl space contains the proverbial “guts” of your house. This includes plumbing, electrical wiring, and heating and cooling systems. Because a closed-cell foam spray limits both moisture and air transfer, it is the best option for insulating your crawlspace. Additionally, its reduced thickness helps the foam defy gravity and stick when sprayed on the underside of the floor or on crawl space walls.

Ask the Experts

Are you still unsure which of these spray foam solutions for your crawl space are best-suited to your needs? Just ask the experts! At DFW Thermal Solutions, our seasoned team offers over 25 years of experience serving the residents of the Dallas/Ft. Worth Metropolis. For reliable insulation services from skilled and passionate contractors, call the DFW Thermal Solutions pros today at (972) 382-7124 or request a free insulation quote by visiting our website and filling out our online form.