An internal wall that carries load. The build-up is a mass–spring–mass arrangement with two decoupled Omega channels, which is the arrangement used where airborne sound transmission between dwellings matters. The intended applications below follow from that geometry — they are not a performance claim, and no acoustic figure is stated for this detail until a laboratory test report exists.
D.03
Internal load-bearing wall
Muro portante interior
196 mm
Total thickness · Revision 01 · 2026-08
D.03
Internal load-bearing wall
SCALE 1:10
Dashed layers sit inside the stud cavity, not in addition to it. Keyboard navigable with the arrow keys; the same data is published as a table in the layer schedule below.
Photographs
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Layer schedule
| Layer | Material | Thickness | λ | Function |
|---|---|---|---|---|
| 1 Pladur plasterboard lining | Gypsum board | 13 mm | — | Internal finish |
| 2 Omega furring profile | Cold-formed galvanised steel | 15 mm | — | Decoupled fixing profile for the lining, with a service void |
| 3 INSULTERM 600 in stud cavity | Sprayed thermal-acoustic conglomerate | 45 mm | 0.138 W/m·K | Encapsulation and mass |
| 4 Mineral wool in stud cavity | Rock wool | 50 mm | 0.039 W/m·K | Acoustic core ISOVER Alphatoit rigid rock wool panel, as in D.02. λD from the manufacturer's datasheet (FT_Alphatoit_ES, 14/03/2024), to EN 12667 / EN 12939. |
| 5 INSULTERM 600 in stud cavity | Sprayed thermal-acoustic conglomerate | 45 mm | 0.138 W/m·K | Encapsulation and mass |
| 6 C140 steel stud cavity | Cold-formed galvanised steel | 140 mm | — | Load-bearing structure — the cavity contains layers 3, 4 and 5 |
| 7 Omega furring profile | Cold-formed galvanised steel | 15 mm | — | Decoupled fixing profile for the lining, with a service void |
| 8 Pladur plasterboard lining | Gypsum board | 13 mm | — | Internal finish |
| Total | 196 mm |
An em dash means the source document does not state that value; it is not a zero. Cavity-contained layers are indented — they sit inside the stud depth, so the column does not sum to the total.
Calculated performance
| Property | Value | Basis |
|---|---|---|
| U-value, bridging corrected | 0.45 W/m²K | EN ISO 6946, one-dimensional steady state, with a +20% bridging correction applied as an engineering estimate. |
| Self-weight | 91 kg/m² | Mass estimate from the layers and dimensions in the source document. |
| Traditional equivalent | 239 kg/m² | Derived from the published self-weight and reduction percentage. |
| Weight reduction | −62% | Self-weight against the traditional equivalent build-up. |
| Fire resistance (EI) | Test programme in progress — contact technical department | Awaiting laboratory test report |
| Airborne sound reduction (R_A) | Test programme in progress — contact technical departmentAcoustic test programme in progress | Awaiting laboratory test report |
| Impact sound (L_nw) | Test programme in progress — contact technical department | Awaiting laboratory test report |
| Racking capacity | Test programme in progress — contact technical department | Awaiting laboratory test report |
U-values are one-dimensional steady-state calculations to EN ISO 6946. Bridging correction is applied as an engineering estimate: +20% for walls, +15% for horizontal elements. 2D numerical analysis to EN ISO 10211 is in progress; values will be updated on completion.
Not yet stated
- EIFire resistance · in test
- R_AAirborne sound reduction · in test
- L_nwImpact sound · in test
- rackingRacking capacity · in test
Test programme in progress — contact technical department
Weight against traditional
| Element | Solid System | Traditional | Reduction |
|---|---|---|---|
| D.03 Internal load-bearing wall | 91 kg/m² | 239 kg/m² | −62% |
Where to use it
- Party walls between dwellings — intended use, pending acoustic test
- Corridor walls — intended use, pending acoustic test
- Compartment walls — intended use, pending acoustic and fire test
Design notes
- The two Omega channels are decoupled by design. Rigidly bridging them with a fixing or a service run defeats the mass–spring–mass arrangement.
- Intended applications are stated from the geometry of the build-up. They are not substantiated until the acoustic test programme reports.