R-value by assembly
Modeled
Clear-wall results for the two assessed ThermaTech sections, next to the fiberglass baseline in the same report.
ThermaTech · 2×4 center studsR-21.07
Modeled clear wall · U-0.047 · 5½-inch assemblyThermaTech · 2×6 center studsR-20.48
Modeled clear wall · U-0.049 · 5½-inch assembly2×6 wood · R-19 battsR-15
Modeled effective assembly · same report
Modeled assumptions. Intertek, June 2026, LBNL THERM and ASHRAE 90.1 Appendix A. The ThermaTech figures are 5½-inch clear-wall sections and exclude top and bottom framing. The batt figure is that report’s effective assembly value for an ASHRAE 90.1 2×6 wood wall with R-19 cavity insulation, not a claim about every framed wall. The model assumed 1.0 pcf EPS at R-4.35 per inch. ASTM C578 Type I is R-3.6 per inch and Type VIII is R-3.8 per inch, so the EPS on a project has to match the model before the result is used. This is not a hot-box test.
Thermal bridge at the stud
Modeled
Studs sit in opposite faces of the foam, so there is no solid wood path straight through the wall. This chart is the modeled resistance of that stud path. It is not a split of heat flow among studs, cavity, and the thermal break.
ThermaTech stud pathAbout R-12.6
Modeled path through the separated studsSolid 2×6 studAbout R-6 to R-7
Reported range for a solid stud, shown as a range
Modeled assumptions. Intertek THERM stud path, about R-12.6, compared with about R-6 to R-7 for a solid 2×6 stud. The solid-stud bar is that reported range, not a single tested point. Clear-wall sections still exclude plates and junctions.
Conductive heat loss versus the batt baseline
Modeled
In the same Intertek model, the 2×4 center-stud panel lost about 30% less heat by conduction than the 2×6 R-19 batt baseline. The 2×6 center-stud panel was about 27% lower. The bars show heat loss still remaining, with the baseline at 100.
2×6 wood · R-19 battsBaseline
Modeled effective assembly R-15ThermaTech · 2×4 center studsAbout 30% less
Modeled conductive heat loss still remainingThermaTech · 2×6 center studsAbout 27% less
Modeled conductive heat loss still remaining
Modeled assumptions. Intertek Table 3, conduction only, against one specified 2×6 R-19 wood baseline at effective R-15. Air leakage of the panel was not tested. A separate total-heat-loss figure in the report adds an assumed infiltration reduction and is not used here. Savings vary with climate, fuel, design, and how the home is used.
Other walls, clear wall and whole wall
Modeled
These are other published assemblies. They are not the ThermaTech panel, and the bars are not a cross-study product ranking.
DOE/BSC open-cell spray foam
Cavity insulation labelR-21
Modeled input · separate studyClear wallR-17.2
Modeled · 5½ in. · 2×6 at 24 in. o.c. · OSBWhole wallR-16.5
Modeled · same table
DOE/BSC closed-cell spray foam
Cavity insulation labelR-29
Modeled Table 11 entry · 5 in. foamClear wallR-20.3
Modeled · 2×6 at 24 in. o.c. · OSBWhole wallR-19.1
Modeled · same table
Oak Ridge National Laboratory
2×6 R-19 batt · clear wallR-16.4
Published research · not a ThermaTech test2×6 R-19 batt · whole wallR-13.7
Published research · not a ThermaTech testFoam-core panel example · whole wallR-21.6
Published example · not a ThermaTech test
Modeled assumptions. DOE-hosted Building Science Corporation High-R Walls, Table 11: open-cell is 5½-inch foam in 2×6 advanced framing at 24 inches on center with OSB; closed-cell is 5-inch foam in that same framing. Oak Ridge National Laboratory reported the batt and foam-core examples for those assemblies. Whole-wall values include plates, junctions, and other details that a clear-wall section leaves out.
One home’s blower-door result
Measured
A five-year-old ThermaTech home in Fort Worth tested at 2.65 ACH50 in 2025. The other bars are published reference points, not measurements of this house or of a panel.
Fort Worth home · 20252.65 ACH50
Measured · one home · about five years occupied2021 IECC limit · zones 3–83.0 ACH50
Code limit · not a test of this homeRESNET · zone 4A averageAbout 3.5
Published average · not a ThermaTech resultRESNET · zone 3A averageAbout 3.6
Published average · not a ThermaTech result
Measured assumptions. Henry energy case study, one occupied home. Airtightness depends on the whole house. The 2021 IECC limit shown is 3.0 ACH50 for climate zones 3–8. RESNET climate-zone 3A and 4A averages are about 3.6 and about 3.5. Air leakage of the panel itself was not tested under ASTM E2178 or E2357. This chart is not a leakage reduction for the panel.
Observed energy bills for one home
Measured
Average monthly electricity was $86.79 and gas was $24.37 during the 2020–2021 study of the Henry home. These are observed costs, not a predicted saving.
Electricity$86.79
Measured monthly average · 2020–2021 · one homeGas$24.37
Measured monthly average · 2020–2021 · one home
Measured assumptions. One household in Fort Worth: 3,196 conditioned square feet, two occupants, 71°F setting. The home also had open-cell roof insulation and its own windows and HVAC. Current bills depend on climate, rates, design, and use.
Effective wall R-value (higher is better)
Effective R-value for code compliance, from Intertek Table 3. Higher is better.
Whole-wall R-value from other studies
One whole-wall result per system. This is not Intertek’s effective-for-code measure, so it is not on the chart above.
See the full Table 3 numbers
| System | What the number is | R-value | Source |
|---|
| ASHRAE 90.1 2×6 wood frame | Nominal insulation label | R-19 | Source 1 |
|---|
| ASHRAE 90.1 2×6 wood frame | Effective for code | R-15 | Source 1 |
|---|
| ASHRAE 90.1 2×6 wood frame | Total effective, with infiltration | R-15 | Source 1 |
|---|
| ASHRAE 90.1 2×6 steel frame | Nominal insulation label | R-19 | Source 1 |
|---|
| ASHRAE 90.1 2×6 steel frame | Effective for code | R-9 | Source 1 |
|---|
| ASHRAE 90.1 2×6 steel frame | Total effective, with infiltration | R-9 | Source 1 |
|---|
| ThermaTech · 5.5 in. · 2×4 center studs | Nominal insulation label | R-24 | Source 1 |
|---|
| ThermaTech · 5.5 in. · 2×4 center studs | Effective for code | R-21 | Source 1 |
|---|
| ThermaTech · 5.5 in. · 2×4 center studs | Total effective, with reduced infiltration | R-23.3 | Source 1 |
|---|
| ThermaTech · 5.5 in. · 2×6 center studs | Nominal insulation label | R-24 | Source 1 |
|---|
| ThermaTech · 5.5 in. · 2×6 center studs | Effective for code | R-20 | Source 1 |
|---|
| ThermaTech · 5.5 in. · 2×6 center studs | Total effective, with reduced infiltration | R-22.3 | Source 1 |
|---|
| ThermaTech · 2×4 center studs · compared with wood frame | Performance equivalent | R-43 | Source 2 |
|---|
| ThermaTech · 2×4 center studs · compared with steel frame | Performance equivalent | R-50 | Source 2 |
|---|
| ThermaTech · 2×6 center studs · compared with wood frame | Performance equivalent | R-42 | Source 1 |
|---|
| ThermaTech · 2×6 center studs · compared with steel frame | Performance equivalent | R-49 | Source 1 |
|---|
| ThermaTech · 5.5 in. · 2×4 center studs | Modeled clear wall | R-21.07 | Source 3 |
|---|
| ThermaTech · 5.5 in. · 2×6 center studs | Modeled clear wall | R-20.48 | Source 3 |
|---|
Other published comparisons
| System | What the number is | R-value | Source |
|---|
| 2×4 wood · 16 in. o.c. · R-11 batts | Nominal insulation label | R-11 | Source 4 |
|---|
| 2×4 wood · 16 in. o.c. · R-11 batts | Clear wall | R-10.6 | Source 4 |
|---|
| 2×4 wood · 16 in. o.c. · R-11 batts | Center of cavity | R-13.6 | Source 5 |
|---|
| 2×4 wood · 24 in. o.c. · R-11 batts | Nominal insulation label | R-11 | Source 4 |
|---|
| 2×4 wood · 24 in. o.c. · R-11 batts | Clear wall | R-10.8 | Source 4 |
|---|
| 2×4 wood · 24 in. o.c. · R-11 batts | Whole wall | R-9.9 | Source 4 |
|---|
| 2×4 wood · 24 in. o.c. · R-11 batts | Center of cavity | R-13.6 | Source 5 |
|---|
| 2×6 wood · 24 in. o.c. · R-19 batts | Nominal insulation label | R-19 | Source 4 |
|---|
| 2×6 wood · 24 in. o.c. · R-19 batts | Clear wall | R-16.4 | Source 4 |
|---|
| 2×6 wood · 24 in. o.c. · R-19 batts | Whole wall | R-13.7 | Source 4 |
|---|
| 2×6 wood · R-19 batts · ASHRAE 90.1 baseline | Effective assembly | R-15 | Source 1 |
|---|
| SIP · 3.5 in. EPS core | Clear wall | R-15.17 | Source 6 |
|---|
| SIP · 3.5 in. EPS core · best-practice details | Whole wall · best-practice details | R-14.09 | Source 6 |
|---|
| 6 in. foam-core stress-skin panel | Clear wall | R-24.7 | Source 4 |
|---|
| 6 in. foam-core stress-skin panel | Whole wall | R-21.6 | Source 4 |
|---|
| EPS block-form ICF | Clear wall | R-15.2 | Source 4 |
|---|
| Tested ICF · 9¼ in. form | Hot-box measurement | R-11.6 | Source 7 |
|---|
| Tested ICF · 9¼ in. form | Simulated clear wall | R-12.0 | Source 7 |
|---|
| Tested ICF · 9¼ in. form | Whole wall | R-11.1 | Source 7 |
|---|
| Open-cell spray foam · 2×6 at 24 in. o.c. | Nominal cavity label | R-21 | Source 8 |
|---|
| Open-cell spray foam · 2×6 at 24 in. o.c. | Clear wall | R-17.2 | Source 8 |
|---|
| Open-cell spray foam · 2×6 at 24 in. o.c. | Whole wall | R-16.5 | Source 8 |
|---|
| Closed-cell spray foam · 2×6 at 24 in. o.c. | Nominal cavity label | R-29 | Source 8 |
|---|
| Closed-cell spray foam · 2×6 at 24 in. o.c. | Clear wall | R-20.3 | Source 8 |
|---|
| Closed-cell spray foam · 2×6 at 24 in. o.c. | Whole wall | R-19.1 | Source 8 |
|---|
Left off this chart.- ThermaTech panel wall with added cavity insulation. No modeled or published clear-wall or whole-wall R-value for a ThermaTech panel plus added cavity insulation is in this site’s sources. That assembly is not estimated here.
- ThermaTech whole-wall R-value. Intertek does not publish a steady-state whole-wall R-value. Table 3’s R-43 and R-50 figures are performance equivalents that include assumed air leakage. They are charted separately and are not a whole-wall R-value. Top and bottom framing, corners, and openings are outside the clear-wall sections.
- ICF climate-equivalent performance. The ORNL whole-wall calculator paper also reports climate-specific wood-frame equivalents for the tested ICF (R-14.5 in Minneapolis, R-17.2 in Washington, D.C., and up to R-20.5 in Phoenix), plus a wider band after an airtightness assumption. Those are not the wall’s steady-state R-value, so they are not drawn as wall R-values. Source
- Unfinished SIP hot-box surface resistances. The ORNL SIP report also lists hot-box results for unfinished 3.5-inch and 5.5-inch panels without the siding and gypsum used in the whole-wall model. Those surface resistances are not whole-wall ratings, so they are not charted. Source
Not charted, because these sources do not support the numbers: a heat-flow percentage split among studs, the cavity, and the thermal break; a tested panel air-leakage reduction; a laboratory hot-box R-value; R-42–R-50 or R-47 drawn as a wall R-value; a ranking of this panel against spray foam; and a predicted utility-bill savings figure.