Technical comparison of loaded build-ups
Ranges come from the build-ups available in the calculator. A value that is not published is never estimated.
| System | Boards/side | Thickness | Frame | Fire | Acoustic | Max. height | Calculate |
|---|---|---|---|---|---|---|---|
| W381single-layer AQUAPANEL partition | 1 | 75–100 mm | 50–75 mm | EI 30 | 43–45 dB | 3 m | Calculate |
| W382double-layer AQUAPANEL partition | 2 | 100–125 mm | 50–75 mm | EI 90 | 50–52 dB | 3 m | Calculate |
| W386technical AQUAPANEL partition | 2 | 155 mm | 2 × 50 mm | EI 90 | 55 dB | 4 m | Calculate |
Which AQUAPANEL system to choose
Project need
Compact wet area with one board per side
W381
Fewer layers and a single frame.
Project need
Greater robustness with two cement boards
W382
Two boards per side on one frame.
Project need
Services, sanitary block or permanent humidity above 80%
W386
Braced double frame and a technical cavity.
Moisture-resistant gypsum or AQUAPANEL
- ✓H1 gypsum board suits controlled ambient humidity within its field of use; it is not equivalent to cement board under direct water.
- ✓Showers and water-exposed walls require a complete waterproofing and junction strategy.
- ✓Saunas, indoor pools, changing rooms and industrial kitchens justify evaluating W386.
Critical wet-area mistakes
- !Skipping waterproofing because the board itself resists water.
- !Using gypsum compound or tape in an AQUAPANEL joint.
- !Adding PU adhesive and mortar as though both joint methods were cumulative.
- !Using screws or profiles without the protection required by the environment.
KNAUF · FERRAGUT
The complete cement-board system
The report separates board, Maxi TN or TB screws, barrier, waterproofing tape, PU or mortar-and-mesh joints and the final AQUAPANEL finish.
AQUAPANEL® Placa IndoorLightweight, water-resistant cement board for interior partitions and ceilings in wet areas.
AQUAPANEL® Q4 FinishWater-repellent paste for treating joints and achieving a smooth Q4 finish on AQUAPANEL® interior panels.
AQUAPANEL® Tornillo Maxi TBCorrosion-resistant self-tapping screw for fastening AQUAPANEL® panels to thicker metal profiles.
AQUAPANEL® Tornillo Maxi TNHigh-hardness, corrosion-resistant screw for fastening AQUAPANEL® panels to thin-gauge metal structures.
Barrera de agua AQUAPANEL®A breathable, water- and wind-resistant membrane to protect AQUAPANEL® enclosures and facades.
Cinta de Juntas AQUAPANEL®Alkali-resistant mesh tape for reinforcing joints between AQUAPANEL® cement boards.
Cinta impermeabilizanteElastic tape for waterproofing joints, corners, and intersections on walls and floors in wet areas.
Imprimación Aquapanel®A synthetic primer that regulates absorption and improves adhesion on AQUAPANEL® cement boards.Official technical source
W38I.es Knauf AQUAPANEL Indoor (2025)
Performance is checked against the stated revision. Ferragut does not fill missing values or replace technical design.
Reviewed 29 August 2026