Programmatic SEO
Target U-valueWall insulation thickness calculator
This sizing page estimates how much insulation is needed to reach the target U-value for a wall insulation thickness calculator.
Used for quick thermal checks of walls, roofs, and floors.
Base wall build-up used for the estimate.
Remaining resistance is translated into insulation thickness.
Target U-value 0.25 W/m²K based on a wall insulation thickness calculator reference build-up.
How much insulation is needed to reach 0.25 W/m²K?
The sizing example starts from the base wall resistance, subtracts it from the target total resistance, and converts the remaining resistance into thickness.
| 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 |
| Solid ceramic brick |
Solid ceramic brick
Masonry wall leaf
|
25 cm | 0.770 W/mK | 0.32 m²K/W |
| External finish |
Silicone render
Facade finish
|
1.5 cm | 0.870 W/mK | 0.02 m²K/W |
| Mineral wool |
Mineral wool
General insulation
|
12.1 cm | 0.035 W/mK | 3.47 m²K/W |
| Surface resistances | 0.17 m²K/W | |||
| Total resistance | 4.00 m²K/W | |||
Target U-value calculation
R = d / lambda
The target resistance is 1 / U. Once the base wall resistance is known, the remaining resistance can be turned into thickness for a chosen insulation material.
U = 1 / (Rsi + sum(R layers) + Rse)
For this reference page, mineral wool and EPS are compared side by side so the page stays useful without being empty.
Related calculators and guides
How To Calculate U Value
Open how to calculate u value for the next step in this journey.
Open next stepInsulation Thickness Calculator
Open insulation thickness calculator for the next step in this journey.
Open supportOpen the calculator
Use the main calculator to edit layers, compare materials, and export a custom result.
Open calculatorTarget note
This is a quick reference page for planning. Use the full calculator to verify junctions and detailed layer ordering.
Thickness comparison
Mineral wool and EPS are shown because they are common search targets and give a fast comparison baseline.