TECHNICAL GUIDE AND QUANTITY REPORT

Knauf W381: single-layer AQUAPANEL partition

W381.es is an interior partition using AQUAPANEL Indoor cement board for high-moisture conditions. The quantity report includes the specific accessories required by the cement-board system.

Calculate materials for W381
This guide and quantity report support product selection and ordering. They do not replace project design, professional approval or checks for loads, fixings, junctions and site-specific conditions.
Variants
2
Thickness range
75–100 mm
Documented EI
EI 30
Documented Rw
43–45 dB

DECISION SHEET

When to choose W381

Best suited to

Wet internal areas requiring a compact AQUAPANEL solution with one cement board per side.

Compare first with

W382 adds a second board per side for a more robust build-up; W386 uses a double frame for services and permanently humid areas.

Critical site checks

  • ✓Waterproof every face directly exposed to water and retain the barrier with its required overlaps.
  • ✓Choose one AQUAPANEL joint method: PU adhesive or joint mortar with 100 mm mesh tape.
  • ✓Use acoustic seal and fix perimeter profiles at no more than 600 mm centres and at least three points.

Available W381 variants

Choose a specific build-up to open the quantity report with that system already loaded. Only performance values published by the associated technical source are displayed.

Build-upThicknessBoardsFrameFireAcousticMax. heightCalculate this variant
W381 · 75 mm1 × boards per face 75 mm 1 × Knauf AQUAPANEL Indoor 12,5 Knauf stud and channel 50 EI 30 Rw 43 dB 3 m Calculate this variant
W381 · 100 mm1 × boards per face 100 mm 1 × Knauf AQUAPANEL Indoor 12,5 Knauf stud and channel 75 EI 30 Rw 45 dB 3 m Calculate this variant

How to choose a W381 variant

Choose the frame width according to thickness and performance. Direct water exposure requires the documented barrier, overlaps, corrosion-resistant screws and AQUAPANEL joint treatment.

Current technical source loaded

W38I.es Knauf AQUAPANEL Indoor (2025) · 2025-08

The Ferragut quantity report prepares

  • ✓Boards on both faces
  • ✓Compatible studs and channels
  • ✓Cavity insulation
  • ✓Screws for every layer
  • ✓Tape, compound and acoustic seal
  • ✓Barrier, corrosion-resistant screws and AQUAPANEL joint treatment
Calculate materials for W381

What this system family contains

The composition comes from the loaded variants and identifies the work items involved before preparing the quantity report.

011 × Knauf AQUAPANEL Indoor 12,5
02Knauf stud and channel 50
03Knauf Insulation mineral wool
04Knauf stud and channel 75

Questions about Knauf W381

What is the Knauf W381 system?

W381.es is an interior partition using AQUAPANEL Indoor cement board for high-moisture conditions. The quantity report includes the specific accessories required by the cement-board system.

Which W381 variant should I choose?

Choose the frame width according to thickness and performance. Direct water exposure requires the documented barrier, overlaps, corrosion-resistant screws and AQUAPANEL joint treatment.

What does the calculator quantify?

The tool estimates complete purchase units for boards, profiles, insulation, screws, joint treatment and accessories compatible with the selected build-up.

Where does the technical data come from?

Performance data comes from W38I.es Knauf AQUAPANEL Indoor (2025), revision 2025-08. Values that are not published are not inferred.

FAMILY COMPARISONCompare W381, W382 and W386Compare build-ups →