Fermacell CLT floors
8 system references
We are a supply and fit installation contractor, not the manufacturer. Information here is reproduced from manufacturers' literature for reference only; always confirm it directly with the manufacturer before specifying, ordering or installing.
fermacell flooring element build-ups over 140 mm CLT floor slabs, with and without a suspended ceiling, giving impact (Ln,w) and airborne (Rw) sound insulation. The guide quotes REI 60 / REI 90 (ETA-14/0349) for the CLT slab itself, not per build-up. Use the filter to narrow by performance or board.
| Reference | Build-up | Rw (dB) | Ln,w (dB) | Construction height (mm) | Area of application | |
|---|---|---|---|---|---|---|
| 2 E 22 (305 mm, Floorrock GP) | Flooring element 2 × 12.5 mm fermacell gypsum fibreboards on 30 mm fermacell Honeycomb insulation on 20 mm Floorrock GP on 60 mm EPS 150 kPa on 30 mm Honeycomb insulation, on 140 mm CLT; no ceiling below. | 67.8 | 46.0 | 305 | 1 | |
| 2 E 22 (305 mm, 80 mm Schneider) | Flooring element 2 × 12.5 mm fermacell gypsum fibreboards on 30 mm Honeycomb insulation on 80 mm Schneider 140 kPa on 30 mm Honeycomb insulation, on 140 mm CLT; no ceiling below. | 68.3 | 48.4 | 305 | 1 | |
| 2 E 35 (245 mm) | Flooring element 2 × 12.5 mm fermacell gypsum fibreboards + 20 mm mineral wool on 2 × 30 mm Honeycomb insulation, on 140 mm CLT; no ceiling below. | 66.9 | 50.2 | 245 | 1 | |
| 2 E 35 (215 mm) | Flooring element 2 × 12.5 mm fermacell gypsum fibreboards + 20 mm mineral wool on 30 mm Honeycomb insulation, on 140 mm CLT; no ceiling below. | 64.2 | 51.8 | 215 | 1 | |
| 2 E 22 (215 mm) | Flooring element 2 × 12.5 mm fermacell gypsum fibreboards on 20 mm Steico Therm sd on 30 mm Honeycomb insulation, on 140 mm CLT; no ceiling below. | 64.1 | 53.6 | 215 | 1 | |
| 2 E 35 (309.5 mm, with ceiling) | Flooring element 2 × 12.5 mm fermacell gypsum fibreboards + 20 mm mineral wool on 2 × 30 mm Honeycomb insulation, on 140 mm CLT, with 27 mm top hat profile + mineral wool and 3 × 12.5 mm fermacell gypsum fibreboard ceiling below. | 75.8 | 38.7 | 309.5 | 1 | |
| 2 E 35 (297 mm, with ceiling) | Flooring element 2 × 12.5 mm fermacell gypsum fibreboards + 20 mm mineral wool on 2 × 30 mm Honeycomb insulation, on 140 mm CLT, with 27 mm top hat profile + mineral wool and 2 × 12.5 mm fermacell gypsum fibreboard ceiling below. | 74.2 | 41.3 | 297 | 1 | |
| 2 E 35 (284.5 mm, with ceiling) | Flooring element 2 × 12.5 mm fermacell gypsum fibreboards + 20 mm mineral wool on 2 × 30 mm Honeycomb insulation, on 140 mm CLT, with 27 mm top hat profile + mineral wool and fermacell gypsum fibreboard ceiling below (printed as 2 × 12.5 mm). Sound values under internal review by fermacell. | 74.2 | 50.0 | 284.5 | 1 |
System references, build-ups and performance figures are Fermacell's own data, reproduced here from fermacell Specification Guide for reference only, with credit to Fermacell.
Each reference links to Fermacell's page for the full, current specification - always specify from Fermacell's own documentation, HCI will not be held liable for a misspecification where this page has been used in lieu of the true manufacturer.
If you represent Fermacell and have a query pertaining to this library, please email info@howeceilings.co.uk. Data retrieved 10 October 2026.
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