Steel frame wall
Steel frame wall
Steel frame wall plus mineral wool in a standard search-targeted build-up.
Steel frame wall
Steel Frame Wall U-value with 20 cm Mineral Wool
This reference baseline shows a 14 cm steel frame wall with 20 cm mineral wool.
Used for quick thermal checks of walls, roofs, and floors.
Worked example: Steel frame wall with 20 cm mineral wool
The reference example keeps the result useful for the "steel frame wall with 20 cm mineral wool" search intent without repeating the same wording on every wall page.
Use this page when you want a fast example for a specific wall thickness and insulation thickness combination.
U-value
What this example represents
This variant describes an assembly related to a steel frame wall. The page focuses on material, thickness, and the resulting U-value. Read the value as a conceptual comparison: it shows the effect of thickness and lambda, but it does not include every junction detail, fixing, or moisture condition.
The insulation material or assumption is mineral wool. This material helps with acoustics and fire behaviour, but it needs moisture protection and careful installation.
Steel frame assemblies are especially sensitive to thermal bridges through structural members. Before using the result for construction decisions, check current product data, local requirements, layer continuity, and possible thermal bridges.
Compare this page with nearby variants rather than reading it in isolation. The most useful set is the no-additional-layer case, a minimum option, and an option with margin for installation error and material tolerance.
If the example covers services, concrete, or heating, use it as a starting point for range checking. Exact sizing still depends on standards, loads, pressures, protective devices, or local execution conditions.
Assembly thickness
Assembly thickness
Total build-up thickness is 37 cm.
U-value
U-value
The estimated U-value is based on the full layer stack.
CategoryLambdaLayerMaterialThickness
How it works
Search note
Pages like this support long-tail search queries and help users land directly on an assembly example.
Practical note
For detailed design, check the calculator and the wall guide pages to account for junctions and thermal bridges.
How this wall build-up is calculated
Each layer adds resistance using R = d / lambda. The final U-value includes the wall leaf, the insulation, and the surface resistances.
This page is a quick reference, while the main calculator remains the place to adjust the exact project layers.
Add layerRestore default setupRemove
Assembly nameThickness unitInternal Rsi (m2K/W)External Rse (m2K/W)
Calculation assumptions
The calculators use visible formulas and explicit unit conversions. Treat the result as a preliminary check, not a complete building design.
- SI and US units are converted separately; R, RSI, U-value, and U-factor are not mixed without the unit factor.
- Enter positive values and compare the result with the selected product datasheet.
- Local codes, thermal bridges, fasteners, and installation quality can change the requirement.
- Last formula review: 2026-04-27.
See how formulas, unit conversions, rounding, and limitations are handled. Methodology details.
Frequently Asked Questions
Lambda is the thermal conductivity of a material, usually shown in W/mK. Lower lambda means heat moves through that material more slowly, but the final assembly still depends on thickness, surface resistances, and every other layer.
U-value describes heat loss through the whole building element, not just one material. A low U-value usually means a better insulated wall, roof, or floor, provided the real build-up matches the layers entered in the calculator.
Yes. Use the comparison section to keep thickness constant, then compare materials by lambda and calculated thermal resistance. This is useful when two products look similar on paper but behave differently at the same installed depth.
Yes. You can print the result or export it to CSV, Excel, or PDF for reports and documentation.
Yes. It is designed for layered assemblies such as external walls, flat roofs, pitched roofs, floors, and slabs. For unusual assemblies, add every relevant layer and treat the result as a planning check before formal verification.
Yes. It is intended for fast concept-stage calculations, insulation comparison, and envelope optimisation before detailed design. It is best used to narrow choices, not to replace a code check or project-specific thermal bridge assessment.
Yes. You can switch between millimeters, centimeters, and inches, and the calculator keeps the values consistent. For fewer mistakes, choose one unit system at the start of a project and review converted thicknesses before export.
Use Steel Frame Wall U-value with 20 cm Mineral Wool as a first-pass reference. Before specifying anything, compare the result with the layer continuity, actual project dimensions, product data sheet, and local requirements.