Greater Houston › Closed-Cell Foam
Why Closed-Cell Spray Foam is a Game Changer for Houston Homes
Six performance advantages that make closed-cell foam the default choice for serious Houston homeowners — and why the upfront premium is almost always worth it.
It's the Highest R-Value Per Inch Available
Closed-cell spray foam achieves R-6.5 per inch — the highest of any insulation material. In Houston's existing homes with 2×4 wall framing (3.5" cavity), closed-cell delivers R-22 where fiberglass batts max out at R-13. In tight attic assemblies sprayed to the roof deck underside, closed-cell reaches code-required R-values in far less depth than any alternative.
R-6.5/in
Closed-cell R-value per inch
R-22
In a standard 2×4 wall cavity
It Seals Air and Vapor Simultaneously
Closed-cell foam at 2" thickness achieves a Class II vapor retarder (0.1 perms or less). This means one product air seals and vapor controls in a single application — eliminating the need for separate house wrap, vapor barrier, or spray-applied vapor retarder in most assemblies. For Houston's humid climate where moisture drives from outside to inside all summer, this is not a nice-to-have. It's the whole point.
Class II
Vapor retarder at 2" thickness
1 product
Air seal + vapor control in one
It Adds Structural Strength to Your Building
Unlike any other insulation material, closed-cell spray foam bonds rigidly to framing and sheathing and contributes to the structural assembly. Studies document 200–300% increases in racking resistance when closed-cell is applied in stud bays. For Houston homes in coastal zones or areas subject to tropical storm wind loads, this structural contribution provides meaningful improvement to the building envelope's resilience.
200–300%
Increase in wall racking strength
Rigid bond
Bonds to framing and sheathing
It Doesn't Settle or Degrade
Fiberglass batts lose contact with framing and sag. Blown-in cellulose settles 10–20% over time, reducing effective R-value. Closed-cell foam bonds permanently and maintains its performance indefinitely. A closed-cell attic conversion installed today will perform the same in 25 years as it does on day one. That longevity is part of why the higher upfront cost calculates out to a lower lifetime cost per R-value-year.
0%
Settling or degradation over time
25+ yrs
Expected performance longevity
It Converts Your Attic Into a Conditioned Space
The biggest performance gain in a Houston home comes from converting the vented attic to an unvented conditioned attic — spraying closed-cell foam directly to the underside of the roof deck. The attic shifts from 140–160°F in summer to within a few degrees of indoor temperature. HVAC equipment and ductwork now operate in a conditioned environment rather than an oven, reducing run time and improving efficiency by 20–40%.
140→80°F
Summer attic temp reduction
20–40%
Cooling cost reduction
It Handles Houston's Humidity Without Absorbing It
Closed-cell foam is hydrophobic — it does not absorb water. When Houston flooding events or roof leaks expose insulation to liquid water, closed-cell foam survives without damage. Fiberglass batts and cellulose both absorb water, lose R-value when wet, and can become mold substrate. Closed-cell foam dries out and continues to perform. For Houston homes with crawl spaces, this water resistance is particularly valuable.
Hydrophobic
Does not absorb water
0% loss
R-value retained after water exposure
When Open-Cell Makes Sense Instead
Closed-cell isn’t always the right choice. Open-cell foam costs less and is appropriate for interior walls (sound control), some commercial applications, and projects where vapor permeability is desired or required. In Houston’s exterior assemblies — attics, exterior walls, crawl spaces, and metal buildings — closed-cell is typically the right call. We’ll tell you honestly which system fits your project.
Use Closed-Cell For
- Attic deck underside (unvented conditioned attic)
- Exterior wall cavities in Houston's humid climate
- Crawl spaces and rim joists
- Metal buildings and barndominiums
- Any assembly where vapor control is needed
Open-Cell May Fit For
- Interior partition walls (sound attenuation)
- Interior applications where vapor permeability is acceptable
- Budget-constrained projects with a separate vapor barrier plan
- Some commercial interior assemblies
- When paired with a vapor retarder on the warm side
Ready to Upgrade to Closed-Cell?
Free on-site assessment — we measure your space, evaluate your current insulation, and give you a written quote. 0% interest financing for 12 months. Licensed and insured in Texas.