Acoustical
Test Files
Third-party certified STC, IIC, and HIIC results for Soundstop products across four real-world floor assembly conditions. All tests conducted by an independent accredited acoustical laboratory. Listen to each test recording below.
Soundstop achieves STC as high as 64 on tested assemblies without any separate underlayment — the BA-cored construction delivers the rating in a single product.
Soundstop 3mm outperforms 2mm LVT + 1/8" sound mat by 14 points on the HIIC scale — the most demanding acoustical metric.
All Soundstop products meet or exceed IBC Section 1207 requirements of STC 50 / IIC 50 for residential occupancies.
Soundstop 6.5mm SPC Click + 3/8" mat achieves HIIC 72 — the highest result in the test series.
Hear the Difference
The same floor assembly — the only variable is the flooring. Listen to how Soundstop 3mm Glue Down LVT compares to 2mm LVT with a 1/8" sound mat on the same 3/4" gypsum / 18" OWT substrate.
2mm Glue Down LVT + 1/8" Soundmat
STC 59 · IIC 52 · HIIC 54
HIIC 54 · 2mm + 1/8" Mat
Soundstop 3mm Glue Down LVT
STC 61 · IIC 56 · HIIC 68
HIIC 68 · 3mm Glue Down
6" Concrete Slab
Direct applied · No topical soundmat · No suspended ceiling
| Product Type | STC | IIC | HIIC | Test # | Audio |
|---|---|---|---|---|---|
Soundstop 6.5mm Premium SPC Click | 53 | 58 | 61 | N3441.02 | HIIC 61 · Glue Down |
Tested directly on a 6" concrete slab with no additional underlayment or suspended ceiling — the most demanding substrate condition for acoustical performance.
3/4" Gypsum Underlayment, 18" Open Web Truss
Tested without a Soundmat
Floor Assembly
| Product Type | STC | IIC | HIIC | Test # | Audio |
|---|---|---|---|---|---|
Soundstop 3mm Glue Down LVT | 61 | 56 | 68 | M4430.03 | HIIC 68 · 3mm Glue Down |
2mm Glue Down LVT with a 1/8" SoundmatTraditional Method | 59 | 52 | 54 | K8181.02 | HIIC 54 · 2mm + 1/8" Mat |
Soundstop 3mm Glue Down LVT outperforms 2mm LVT + 1/8" sound mat in every metric — STC +2, IIC +4, HIIC +14 — without any separate underlayment.
3/4" Gypsum, 18" Open Web Truss
Tested with a 1/8" Soundmat
| Product Type | STC | IIC | HIIC | Test # | Audio |
|---|---|---|---|---|---|
Soundstop 3mm Glue Down LVT | 60 | 58 | 64 | F6872.02 | HIIC 62 · 3mm Glue Down + 1/8" Mat |
Soundguard 5.5mm XL Premium SPC Click | 60 | 59 | 68 | N4907.03 | HIIC 68 · Soundguard SPC Click |
Soundstop 6.5mm Premium SPC Click | 60 | 59 | 69 | R5772.02 | HIIC 69 · 6.5mm SPC Click |
All three Soundstop products achieve STC 60 or higher when tested over a 1/8" sound mat, demonstrating additive performance when additional isolation is required.
3/4" Gypsum, 18" Open Web Truss
Tested with a 3/8" Soundmat
| Product Type | STC | IIC | HIIC | Test # | Audio |
|---|---|---|---|---|---|
Soundstop 3mm Glue Down LVT | 60 | 59 | 70 | R5772.04 | HIIC 70 · 3mm Glue Down + 3/8" Pad |
Soundguard 5.5mm XL Premium SPC Click | 60 | 59 | 69 | N4907.03 | HIIC 68 · Soundguard SPC Click |
Soundstop 6.5mm Premium SPC Click | 60 | 59 | 72 | R5772.02 | HIIC 69 · 6.5mm SPC Click |
With a 3/8" sound mat, Soundstop 6.5mm SPC Click achieves HIIC 72 — the highest rating in the test series, suitable for the most acoustically demanding multi-family applications.
Testing Methodology
All acoustical tests were conducted by an independent, accredited third-party laboratory in accordance with ASTM E90 (STC), ASTM E492 (IIC), and ISO 10140 (HIIC) standards. Test reports are available upon request for specification purposes. HIIC (High Impact Insulation Class) is a newer, more rigorous metric than IIC and is increasingly required by building codes and architects for multi-family residential projects.
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