Verify Mass Timber Acoustic Performance

• Airborne Sound (Rw, Rw+C, Rw+Ctr): Verifies sound reduction across the assembly, with spectrum adaptation terms your project demands.
• Impact Sound (Ln,w, Ln,w+CI): Checks impact sound pressure performance — the metric that most often governs mass timber floors.
• Tested-Assembly Basis: Every build-up is anchored to a genuine, third-party laboratory test. No assembly is presented as “tested” unless it is.
• Mass Law Adjustment: The only variable extrapolated is the timber itself — its density and species — leaving the acoustic build-up exactly as it was tested.
• Site Tolerance: Lets the specifier apply an explicit margin of conservatism, rather than hiding it.

Why Prediction Alone Doesn’t Cut It — Parametric acoustic software estimates everything in an assembly from material properties (density, bending stiffness, damping) with no anchor to a real result. For mass timber, where systems are still evolving and every supplier’s layup is slightly different, the error bars widen fast. Rebuild a known lab-tested floor in a pure prediction tool and the variation can be enormous.

SPEC Toolbox flips the model — starting from a real laboratory test and working outward from it within tightly defined bounds — interpolating, never freely extrapolating.

The Mass Law Engine — Our unique asset is the mass timber supply chain — the deepest dataset of CLT panels, species and densities anywhere. For any assembly, the acoustic build-up (topping, resilient layer, ceiling) stays fixed to exactly what was tested. The single variable allowed to move is the timber panel: change the layup, thickness, density or species, and the platform applies a mass law adjustment to the rating. Swap a 150mm European spruce panel for a 140mm radiata pine one and you get a mass-based adjustment from the real test — not a from-scratch guess.

Airborne & Impact, Done Properly — CLT floors live and die on impact sound. A bare concrete slab gets most of its acoustic credit from rolling off high-frequency energy with a thin finish; a lightweight timber floor doesn’t behave that way. SPEC Toolbox models airborne and impact performance from the tested assembly up, presenting the full third-octave spectrum, not just a single number.

Rating Systems That Match Your Code — supports rating pathways relevant to each region, from pass/fail code minimums through to star-rated performance levels. Metrics such as Rw and Ln,w derived using governing standards.

No Black Box — every result exposes the test it was built on, the assumptions made and the curves behind the rating. Engineer can print a summary report or detailed report with every intermediate step.

The Acoustic Supermarket of Choice — specifiers can pair their chosen CLT supplier with the acoustic products of leading manufacturers — combining any panel in the supply chain with a resilient underlay or floating-floor system.

Integrity Over the Race to the Bottom — isolated acoustic products (e.g. resilient underlay mat) carry a Delta value only as good as the substrate it was tested on; a resilient layer measured on a 6″ concrete slab behaves very differently under a lightweight timber panel. Platform handles these via third-octave band frequency spectrum data tied to appropriate testing, never by bolting an out-of-context single-number delta onto a build-up. Where a project needs a fully custom system, the platform hands cleanly to the acoustic consultant for final review.

Built With the Industry — acoustic engine shaped over more than a year of collaboration with respected acousticians and the mass timber supply chain, refined through partners holding deep banks of third-party lab data.