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Open cell spray foam insulation Anna TX homeowners choose from NTX Foam Pros delivers outstanding air sealing performance at a more accessible price point than closed cell — making it the right choice for a wide range of residential applications across North Texas. Open cell expands aggressively to fill every cavity, gap, and penetration it contacts, creating an airtight building envelope that dramatically outperforms traditional batt and blown-in insulation on air leakage control.
How Open Cell Spray Foam Works
Open cell spray foam expands to roughly 100 times its liquid volume when applied, filling wall cavities, attic spaces, and any other voids completely. Unlike closed cell, the cell structure remains open after curing — giving the foam a soft, spongy texture and an R-value of approximately 3.5 to 3.7 per inch. While this is lower than closed cell’s R-6.5 per inch, open cell’s aggressive expansion and complete cavity fill makes it highly effective at eliminating air leakage — often the dominant source of energy loss in North Texas homes.
According to Energy Star, air sealing is one of the most impactful improvements a homeowner can make for energy efficiency. Open cell spray foam delivers exceptional air sealing performance at a cost that makes whole-home treatment practical for most budgets.
Where Open Cell Spray Foam Is Used
Open cell spray foam is well suited to interior wall cavity applications, attic floor and roof deck insulation in vented attic assemblies, interior side of exterior walls in new construction, sound attenuation between floors and interior walls, and any application where vapour permeability is acceptable or desirable. It is not the correct product for below-grade applications, direct ground contact, or anywhere moisture management requires a vapour retarder — those applications call for closed cell.
Open Cell vs Closed Cell — Making the Right Choice
Open cell is more economical and expands more aggressively — ideal for filling large cavities and attic applications where space isn’t constrained. Closed cell costs more but delivers nearly double the R-value per inch and adds vapour control — essential for specific applications. Many projects use both — open cell in wall cavities and attic decks, closed cell at rim joists, crawl space walls, and any moisture-sensitive assembly. We assess every project and specify the right product for each application.
Our Open Cell Spray Foam Process
Every open cell spray foam project starts with a free in-home estimate. We assess the application, existing insulation condition, and performance requirements before recommending a scope of work. Installation is completed in a single visit for most residential projects. We protect adjacent surfaces, apply foam to the correct thickness, and leave the site clean.
Serving Anna TX and Surrounding Communities
NTX Foam Pros installs open cell spray foam throughout Anna, McKinney, Celina, Melissa, Van Alstyne, Weston, Gunter, Howe, and Sherman. Call (972) 645-2933 for a free estimate.
Frequently Asked Questions
What R-value does open cell spray foam provide?
Open cell spray foam provides approximately R-3.5 to R-3.7 per inch. A 3.5-inch application — filling a standard 2×4 wall cavity — delivers approximately R-13. A 5.5-inch application in a 2×6 wall delivers approximately R-20.
Is open cell spray foam waterproof?
No — open cell spray foam is vapour permeable and not waterproof. It should not be used in applications with direct water or ground contact. For below-grade and moisture-critical applications, closed cell is the correct specification.
Can open cell spray foam be used in an attic?
Yes — open cell spray foam is commonly used in attic applications, either on the attic floor for a vented attic assembly or on the roof deck for an unvented conditioned attic. The correct application depends on the attic configuration and HVAC layout. We recommend the right approach for your specific home during the estimate.