| Rating | Eclipse II | Eco Ultimate Silencer™ |
|---|---|---|
| IIC | 72 | 73 ▲ |
| STC | 66 | 73 ▲ |
| ΔIIC | not published | 22 ▲ |
The Eco Ultimate publishes a ΔIIC of 22 — the improvement the underlayment contributes to any assembly, independent of concrete thickness or ceiling type. Eclipse II does not publish this figure, making direct comparison harder. ΔIIC 22 is a strong result for a product this thin.
| Assembly | IIC |
|---|---|
| Laminate/Engineered on 8″ concrete + ceiling | 73 |
| Laminate/Engineered on 6″ concrete + ceiling | 70 |
| Hardwood on 6″ concrete + ceiling | 58 |
| Laminate/Engineered on 6″ concrete, no ceiling | 52 |
| Attribute | Eclipse II | Eco Ultimate Silencer™ |
|---|---|---|
| Thickness | 0.070″ | 1.9 mm (≈ 0.075″) |
| Material | Closed cell EVA foam | PU foam + recycled rubber granules ▲ |
| Density | not listed | 25 lb/cu ft ▲ |
| Compression resistance | not listed | 20 psi (ASTM D3676) ▲ |
| Compression set | not listed | <4% (ASTM D3674) ▲ |
| Moisture barrier | Yes | Yes (upgraded film, 7 lb rated) |
| GreenGuard Gold | Yes · UL 2818 | Yes · UL 2818 |
| Antimicrobial | Yes | Yes |
| Radiant heat | Yes | Yes |
| Installation methods | Floating only | Floating · Glue · Nail ▲ |
| Recycled content | No | Yes (LEED MR 4.1/4.2) ▲ |
| R-Value | not listed | 0.17 |
| Warranty | Lifetime | Lifetime |
| Made in USA | Yes | Yes |
| Manufacturer link | — | foamproducts.com ↗ |
| Item | Eclipse II | Eco Ultimate Silencer™ |
|---|---|---|
| Price per roll (100 sq. ft.) | ~$30 | ~$53 ▲ |
| Price per sq. ft. | ~$0.30 | ~$0.53 ▲ |
| Premium for Eco Ultimate | — | +$0.23/sq. ft. (+77%) |
| Example: 500 sq. ft. | ~$150 | ~$265 |
| Example: 800 sq. ft. | ~$240 | ~$424 |
Retail single-roll pricing. Eclipse II from JNS Flooring & Supplies; Eco Ultimate Silencer from The Home Depot (model ECOULTIMATEGREEN100). Prices vary by supplier and volume — confirm current pricing before ordering.
At nearly identical thickness (0.070″ vs. 0.075″), the Eco Ultimate Silencer outperforms Eclipse II on every published acoustic metric — IIC 73 vs. 72, STC 73 vs. 66, and a published ΔIIC of 22 that Eclipse II cannot match because it does not publish the figure.
The material difference matters: recycled rubber granules in the Eco Ultimate handle low-frequency impact energy more effectively than closed-cell EVA foam, particularly in the 100–315 Hz range where thin foam underlayments typically perform weakest.
No field test has yet been conducted with the Eco Ultimate Silencer. Worth confirming projected field performance with CENSEO's Jeanette Hesedahl before specifying.
IIC (Impact Insulation Class) measures how well a complete floor/ceiling assembly blocks impact sound — footsteps, dropped objects, etc. Higher is better. It is always a lab measurement of the whole stack: concrete slab + underlayment + flooring + ceiling below.
The problem: IIC is assembly-specific. Eclipse II's IIC 72 was measured in one particular lab setup — a specific slab thickness with a specific ceiling. Put it in a different building with different concrete and a different ceiling, and the number will be different. You cannot directly compare two products' IIC ratings unless they were tested in the same assembly.
ΔIIC (Delta IIC) solves that. It measures how much the underlayment alone contributes, by testing the same assembly with and without the underlayment and taking the difference. The result is portable — it represents the underlayment's improvement regardless of what assembly it is used in.
Eco Ultimate's ΔIIC 22 means: whatever your bare floor/ceiling assembly scores on its own, add the Eco Ultimate and it should improve by approximately 22 points.
| Scenario | Eclipse II | Eco Ultimate Silencer™ |
|---|---|---|
| Published ΔIIC | not published | 22 |
| Bare assembly baseline (hypothetical) | 42 | 42 |
| Estimated field IIC with underlayment | unknown | ~64 |
| HOA threshold (new installation) | FIIC 62 | FIIC 62 |
Eclipse II publishes IIC 72 but no ΔIIC. Without that figure, it is not possible to predict how it will perform in Continental House's specific assembly. The CENSEO pretest returned AIIC 51 in the field — well below the lab IIC of 72, which is typical, but still a significant gap.
Because Eco Ultimate publishes ΔIIC 22, its contribution to any given assembly can be estimated in advance — making it easier to project whether the HOA's FIIC 62 threshold will be met before committing to installation.