Exact query

Timber wall

Timber wall with 20 cm mineral wool

This retrofit case shows a 14 cm timber wall with 20 cm mineral wool.

Used for quick thermal checks of walls, roofs, and floors.

Quick result

0.14 W/m²K

Estimated U-value from the reference build-up.

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At a glance

Assembly type

Timber wall

Timber wall plus mineral wool in a standard search-targeted build-up.

Total thickness

37 cm

Total build-up thickness is 37 cm.

Estimated U-value

0.14 W/m²K

The estimated U-value is based on the full layer stack.

Worked example

Worked example: Timber wall with 20 cm mineral wool

The retrofit example keeps the result useful for the "timber wall with 20 cm mineral wool" search intent without repeating the same wording on every wall page.

Layer	Material	Thickness	Lambda	R

Layer	Material	Thickness	Lambda	R
Interior finish	Gypsum plaster Interior finish	1.5 cm	0.700 W/mK	0.02 m²K/W
Softwood	Softwood Timber framing	14 cm	0.130 W/mK	1.08 m²K/W
mineral wool	Mineral wool General insulation	20 cm	0.035 W/mK	5.71 m²K/W
External finish	Silicone render Facade finish	1.5 cm	0.870 W/mK	0.02 m²K/W
Surface resistances				0.17 m²K/W
Total resistance				7.00 m²K/W

How it is calculated

How this wall build-up is calculated

R = d / lambda

Each layer adds resistance using R = d / lambda. The final U-value includes the wall leaf, the insulation, and the surface resistances.

U = 1 / (Rsi + sum(R layers) + Rse)

This page is a quick reference, while the main calculator remains the place to adjust the exact project layers.

U Value Timber Wall Mineral wool 20cm

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Comparison

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Wall U Value Calculator

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How To Calculate U Value

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Lambda Values Table

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Open the calculator

Use the main calculator to edit layers, compare materials, and export a custom result.

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Insulation thickness calculator

Move from a U-value target to the thickness needed for walls, roofs, and floors.

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Notes

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.