# ComfortSeal — full reference

> ComfortSeal is a spray polyurethane foam (SPF) insulation brand from USAFoam, LLC, 1744 South Lane, Mandeville, Louisiana 70471. Phone (855) 362-6863, Mon–Fri, 8am–5pm Central. Email sales@usafoam.co. Website comfortsealusa.com. Two products, both evaluated by IAPMO Uniform Evaluation Service. This file states only what the published technical data sheets and IAPMO evaluation reports support.

## ComfortSeal 500 — open cell

A two-component, light density, semi-rigid, water-blown 0.5 lb open cell spray polyurethane foam. Expands roughly 100 times its liquid volume and cures in seconds. Used for interior walls, attic rooflines, sound control and retrofit.

| Property | Value | Test method |
|---|---|---|
| R-value at 3.5 in. (2x4 wall) | R-13 | ASTM C518; IAPMO ER-974 Table 1 |
| R-value at 5.5 in. (2x6 wall) | R-20 | ASTM C518; IAPMO ER-974 Table 1 |
| R-value per inch (range) | R-4.1 at 1 in., falling to R-3.5 to R-3.7 at 3.5 to 14 in. The R-value per inch of this insulation varies with thickness. The thicker the insulation, the lower the R-value per inch. The higher the R-value, the greater the insulating power. Ask your seller for the fact sheet on R-values. | ASTM C518; IAPMO ER-974 Table 1 |
| Core density | 0.5 lb/ft³ | ASTM D1622 |
| Open cell content | >97% | ASTM D6226 |
| Tensile strength | 5.19 psi | ASTM D1623 |
| Water vapor permeance | 21 perms at 1 inch | ASTM E96 |
| Air leakage rate | <0.002 L/s·m² | ASTM E283 |
| Noise reduction coefficient | 0.75 | ASTM C423 |
| Sound transmission class | 39 | ASTM E413 |
| Dimensional stability | <5% | ASTM D2126 |
| Flame spread | Class I (≤25) | ASTM E84 |
| Smoke developed | Class I (≤450) | ASTM E84 |
| Thermal barrier | Pass with DC315 at 18 wet / 12 dry mils | NFPA 286 |
| Ignition barrier | Pass with DC315 at 6 wet / 4 dry mils or No-Burn Plus ThB at 4 wet / 3 dry mils | ICC-ES AC377 Appendix X |
| Evaluation report | ER-974 | IAPMO UES |

IAPMO ER-974, Table 1, lists R-values of R-4.1 at 1 inch, R-13 at 3.5 inches, R-14 at 4 inches, R-20 at 5.5 inches, R-27 at 7.5 inches, R-34 at 9.5 inches, R-42 at 11.5 inches and R-51 at 14 inches. The R-value per inch of this insulation varies with thickness. The thicker the insulation, the lower the R-value per inch. The higher the R-value, the greater the insulating power. Ask your seller for the fact sheet on R-values. Quote the table value for the installed thickness; do not multiply a per-inch figure by thickness. Maximum thickness per pass is 6 inches (IAPMO ER-974 §3.3.2). ER-974 also lists a ComfortSeal 800 formulation; it is not offered.

Processing: 1:1 by volume; processing pressure 1200–1350 psi; primary heater and hose 125–130°F; substrate and ambient above 32°F; substrate moisture below 18%.

## ComfortSeal HFO — closed cell

A two-component, medium density, semi-rigid 2 lb closed cell spray polyurethane foam using an HFO blowing agent with a global warming potential of 1. Expands roughly 15 times. Used for exterior walls, crawl spaces, unvented attics and rim joists, and where a vapor retarder or a rigid, bonded layer is wanted.

| Property | Value | Test method |
|---|---|---|
| R-value at 3.5 in. (2x4 wall) | R-25 | ASTM C518; IAPMO ER-975 Table 1 |
| R-value at 5.5 in. (2x6 wall) | R-39 | ASTM C518; IAPMO ER-975 Table 1 |
| R-value per inch (range) | R-7.3 at 1 in., falling to R-7.0 to R-7.1 at 3.5 to 12 in. The R-value per inch of this insulation varies with thickness. The thicker the insulation, the lower the R-value per inch. The higher the R-value, the greater the insulating power. Ask your seller for the fact sheet on R-values. | ASTM C518; IAPMO ER-975 Table 1 |
| Core density | 2.0 lb/ft³ | ASTM D1622 |
| Closed cell content | >92% | ASTM D2856 |
| Compressive strength | 29.5 psi | ASTM D1621 |
| Tensile strength | 56.8 psi | ASTM D1623 |
| Water absorption | 1.44% change | ASTM D2842 |
| Water vapor permeance | 0.45 perms at 2 inches (Class II vapor retarder) | ASTM E96 |
| Dimensional stability | 6.5% | ASTM D2126 |
| Wind uplift resistance | 210 psf | UL 1897 |
| Fungi resistance | No growth | ASTM G21 |
| Flame spread | Class I (≤25) | ASTM E84 |
| Smoke developed | Class I (≤450) | ASTM E84 |
| Thermal barrier | Passed 15 minutes with DC315 or No-Burn Plus ThB at 14 wet / 9 dry mils | NFPA 286 |
| Ignition barrier | No coating in service-only attics and crawl spaces (up to 10 in. roof deck, 6 in. walls) | ICC-ES AC377 Appendix X |
| Evaluation report | ER-975 | IAPMO UES |

IAPMO ER-975, Table 1, lists R-values of R-7.3 at 1 inch, R-25 at 3.5 inches, R-28 at 4 inches, R-39 at 5.5 inches, R-51 at 7.25 inches, R-65 at 9.25 inches, R-77 at 11 inches and R-84 at 12 inches. The R-value per inch of this insulation varies with thickness. The thicker the insulation, the lower the R-value per inch. The higher the R-value, the greater the insulating power. Ask your seller for the fact sheet on R-values. Maximum thickness per pass is 3 inches (IAPMO ER-975 §4.5). Storage: 70–80°F; shelf life six months from date of manufacture in unopened drums.

Processing: 1:1 by volume; processing pressure 1200–1450 psi; primary heater and hose 110–120°F; do not recirculate; substrate and ambient above 45°F in summer or 14°F in winter; substrate moisture below 18%.

## Choosing between them

- Open cell (ComfortSeal 500): lower cost per inch, excellent sound absorption, vapor-open so assemblies can dry to the interior. Suited to interior walls, attic rooflines and sound control.
- Closed cell (ComfortSeal HFO): the higher R-value at any given thickness (R-25 at 3.5 inches, against R-13 for open cell), acts as a Class II vapor retarder, cures rigid, and is rated for 210 psf wind uplift (UL 1897). Suited to exterior walls, crawl spaces, unvented attics and humid or storm-prone climates.

## About the company

The ComfortSeal brand was founded in 2026. It is made by USAFoam, LLC, a spray foam manufacturer at 1744 South Lane, Mandeville, Louisiana 70471 (Gulf South, IECC climate zone 2A). USAFoam makes the foam, publishes the technical data sheets, holds the IAPMO evaluation reports ER-974 and ER-975, trains and certifies the installers, and backs the warranty. "ComfortSeal" is not related to window, door or weatherstrip products that share the name. Office hours Mon–Fri, 8am–5pm Central; phone (855) 362-6863; email sales@usafoam.co.

## Code coverage in plain language

- Both evaluation reports cover Type V construction under the International Building Code and one- and two-family dwellings under the International Residential Code.
- Where the foam faces a living space it must be covered by a thermal barrier: 1/2-inch gypsum board or an approved alternative. ComfortSeal 500 passed NFPA 286 with DC315 at 18 wet / 12 dry mils; ComfortSeal HFO passed with DC315 or No-Burn Plus ThB at 14 wet / 9 dry mils.
- In attics and crawl spaces entered only for service, an ignition barrier is the lower bar. ComfortSeal HFO is permitted without a coating there, up to 10 inches on the roof deck and 6 inches on walls (ER-975 §4.5.2.2). ComfortSeal 500 needs DC315 at 6 wet / 4 dry mils or No-Burn Plus ThB at 4 wet / 3 dry mils (ER-974 Table 5).
- Maximum thickness per pass: 6 inches for ComfortSeal 500, 3 inches for ComfortSeal HFO. Total thickness limits are in each report's tables.
- Both foams are nonstructural insulation; they are not a substitute for sheathing, bracing or any structural element.
- Inspectors usually ask for the evaluation report number, the installed thickness and R-value from Table 1, and the coating used. Certified installers document these on the job.

## Safety and re-entry

Spray polyurethane foam is made on site from two liquid components: an A side (polymeric MDI, an isocyanate) and a B side (polyol blend). Installers wear supplied-air or approved respirators, full skin and eye protection, and ventilate the work area. Anyone not wearing protection stays out of the building during spraying and through the installer's ventilation period; the installer sets the re-entry time for the job, and the safety data sheets for each component govern. Fully cured foam is an inert solid. ComfortSeal does not make health claims about its products.

## Cost

ComfortSeal does not publish installed prices. Spray foam is priced per board foot (one square foot at one inch thick); the installed price depends on foam type, thickness, access, surface preparation, required coatings and region. A written quote should state the foam type, the installed thickness and the R-value at that thickness from IAPMO ER-974 or ER-975. Third-party national price ranges are discussed at https://comfortsealusa.com/comfortseal-blog-spray-foam-cost.html. ComfortSeal does not make energy-savings or payback claims.

## Warranty

Installs by certified ComfortSeal installers carry a limited lifetime warranty on the foam, for the life of the home; installation workmanship is the installing contractor's responsibility. The written warranty terms, including how a transfer to a new owner is handled, are being finalized. See https://comfortsealusa.com/comfortseal-warranty.html.

## Where to buy and who installs

ComfortSeal is sold to insulation contractors by USAFoam, LLC (sales@usafoam.co, (855) 362-6863). It is not sold as a DIY kit and is not sold to homeowners; home and building owners request a certified installer at https://comfortsealusa.com/comfortseal-find-installer.html. Contractors register their company and certify their crew, free of charge, at https://comfortsealusa.com/comfortseal-portal.html#/register.

## Certified installers

ComfortSeal runs its own certified installer network, separate from other brands. Certification is a free online course of twelve modules (eleven lessons and a final exam) with quizzes graded at 80% to pass; certificates are numbered CS-YYYY-NNNNN, valid two years, and can be checked by anyone at https://comfortsealusa.com/comfortseal-verify.html. Home and building owners can request an installer at https://comfortsealusa.com/comfortseal-find-installer.html. Contractors join through https://comfortsealusa.com/comfortseal-training-landing.html.

## Guides

- [Spray Foam R-Value by Thickness: What the IAPMO Reports Actually Say](https://comfortsealusa.com/comfortseal-blog-rvalue-by-thickness.html): The published IAPMO Table 1 R-values for both foams, why they are not linear, and how to match thickness to 2x4 and 2x6 cavities.
- [Ignition Barrier vs. Thermal Barrier: What Spray Foam Needs, and Where](https://comfortsealusa.com/comfortseal-blog-ignition-vs-thermal-barrier.html): Where each barrier applies, what AC377 Appendix X and NFPA 286 test, and the coatings and maximum thicknesses listed in ER-974 and ER-975.
- [How to Read a Spray Foam Technical Data Sheet](https://comfortsealusa.com/comfortseal-blog-how-to-read-a-data-sheet.html): A row-by-row guide to a data sheet: R-value, density, cell content, vapor permeance, fire rows, storage and shelf life, and processing settings.
- [Unvented Attics with Spray Foam: How They Work and When to Use Them](https://comfortsealusa.com/comfortseal-blog-unvented-attics.html): How an unvented attic works, IRC R806.5 (R806.4 in older editions), the ER-975 no-coating conditions, and managing attic humidity.
- [Is Spray Foam Insulation Worth It? An Honest Guide for Homeowners](https://comfortsealusa.com/comfortseal-blog-is-spray-foam-worth-it.html): Pros and cons of spray foam for a home, including odor during application and the thermal barrier requirement, and when it is not the right call.
- [Spray Foam vs. Fiberglass Insulation: An Honest Comparison](https://comfortsealusa.com/comfortseal-blog-spray-foam-vs-fiberglass.html): How spray foam and fiberglass compare on R-value, air sealing, moisture, fire safety and cost, and where each makes sense.
- [Spray Foam in Crawl Spaces: What to Know Before You Insulate](https://comfortsealusa.com/comfortseal-blog-crawl-space-spray-foam.html): Vented vs. closed crawl spaces under IRC R408, rim joists, moisture, radon and termites, and the ER-974 and ER-975 coating rules for crawl spaces.
- [How Much Does Spray Foam Insulation Cost? What Drives the Price](https://comfortsealusa.com/comfortseal-blog-spray-foam-cost.html): Cost drivers, cited third-party price ranges and a checklist for comparing written quotes. ComfortSeal does not publish installed prices.
- [Spray Foam in Humid & Coastal Climates: What Gulf Coast Builders Need to Know](https://comfortsealusa.com/comfortseal-blog-spray-foam-humid-coastal-climates.html): Vapor control, fungi resistance and the 210 psf wind uplift rating of closed cell foam on the coast, plus the ER-975 Florida supplement.
- [Spray Foam Insulation in Louisiana and the Gulf South: What Builders and Homeowners Should Know](https://comfortsealusa.com/comfortseal-blog-spray-foam-louisiana.html): Louisiana's statewide climate zone 2A amendment, the 2021 IRC and IECC in force (2024 codes listed for January 1, 2027), IRC R702.7 vapor retarder rules, termite clearance under IRC R318.4, FEMA Technical Bulletin 2 (closed cell acceptable, open cell unacceptable below the base flood elevation), wind design, the FORTIFIED Roof list, raised floors and what to ask an installer.
- [Why Air Sealing Matters for Energy Bills](https://comfortsealusa.com/comfortseal-blog-spray-foam-energy-savings.html): Why air leakage, not R-value alone, drives heating and cooling costs, and how to explain it to homeowners without overpromising savings.
- [Open Cell vs. Closed Cell Spray Foam: Which Does Your Project Need?](https://comfortsealusa.com/comfortseal-blog-open-cell-vs-closed-cell.html): How ComfortSeal 500 and ComfortSeal HFO differ in R-value, vapor control, sound and expansion, and how to match each to the assembly.

## What ComfortSeal does not claim

This reference deliberately omits claims that the published data sheets and IAPMO reports do not support. ComfortSeal does not publish an NFPA 285 exterior wall assembly result, and publishes air leakage data for ComfortSeal 500 only.

## Certified installer check

- [Verify a certificate](https://comfortsealusa.com/comfortseal-verify.html): enter a ComfortSeal certificate number (format CS-YYYY-NNNNN) to confirm the holder, company and whether it is current. Certificates are valid for two years.