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Soundstop vs. LVT + underlayment

One product with the soundmat built in, or two products installed separately. Here is what changes on the job, and what the certified lab result shows.

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Certified Lab Result

Soundstop, tested with no separate soundmat.

Floor tested	Separate soundmat	STC	IIC	HIIC
Soundstop 3mm glue-down, R5773.02, open-web wood truss	None	61	56	68

Assembly tested: 18″ open-web wood truss with 3/4″ gypsum-concrete topping, insulation, resilient channel and a gypsum-board ceiling. Ratings belong to this tested assembly, not to the flooring alone. Lab values per ASTM E90 / E492 / E1007; field results typically run a few points lower. Confirm your jurisdiction's requirement and cite the current report in your submittal. More results by assembly: acoustical test data.

What changes on the job.

Soundstop

The soundmat arrives bonded to every plank: one product to buy, stage and install. Available as glue-down LVT (3–5mm) or SPC click (5–6.5mm).

LVT + separate underlayment

Two products and two install steps. Lets you pick the underlayment separately, and thicker mats can raise impact ratings on some assemblies; see the full matrix on the test data page.

When Soundstop is not the right fit

Ground floors and slab-on-grade with no occupancy below. There is nothing to isolate, so a visually matching glue-down LVT without the acoustic core costs less.
Your spec names a specific underlayment or assembly that Soundstop has not been tested in. Ask for the reports first.
The required rating is above what any tested assembly here has reached. Don't assume; confirm with a report.

Soundstop vs. LVT + underlayment

Soundstop, tested with no separate soundmat.

What changes on the job.

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