Insulation·rigid polyurethane 10mm
rigid polyurethane · 10mm
R 0.43
U 1.653 W/m²·K

rigid polyurethane, 10 mm — R 0.43

10 mm divided by a conductivity of 0.023 gives an R-value of 0.43. The U-value is 1.653, so a square metre leaks 33.07 W across a 20-degree difference.

Standards it meets

Not up to any of them yet

Material
rigid polyurethane
Thickness
10 mm
Thermal conductivity
0.023 W/m·K
Thermal resistance
0.43 m²·K/W
U-value
1.653 W/m²·K
Heat lost per square metre
33.07 W
As concrete
0.7 m

Thickness for the same performance

This is the number that shows what insulation is worth. Matching 100 mm of XPS with concrete alone would take 5.7 metres of it. No one builds a wall like that — which is why a concrete building only gets warm once a thin layer of insulation is added.

  • vacuum panel3 mm
  • phenolic foam9 mm
  • extruded polystyrene12 mm
  • graphite EPS13 mm
  • white EPS16 mm
  • glass wool16 mm
  • mineral wool17 mm
  • cellulose18 mm
  • timber57 mm
  • plasterboard78 mm
  • concrete696 mm

Nearby cells

rigid polyurethane 20mm
R 0.87
phenolic foam 10mm
R 0.5
extruded polystyrene 10mm
R 0.36

Same material, other thicknesses

rigid polyurethane 10mm
R 0.43
rigid polyurethane 20mm
R 0.87
rigid polyurethane 30mm
R 1.3
rigid polyurethane 50mm
R 2.17
rigid polyurethane 70mm
R 3.04
rigid polyurethane 100mm
R 4.35
rigid polyurethane 120mm
R 5.22
rigid polyurethane 150mm
R 6.52
rigid polyurethane 200mm
R 8.7
rigid polyurethane 250mm
R 10.87
rigid polyurethane 300mm
R 13.04
rigid polyurethane 400mm
R 17.39

Same thickness, other materials

vacuum panel 10mm
R 1.43
phenolic foam 10mm
R 0.5
rigid polyurethane 10mm
R 0.43
extruded polystyrene 10mm
R 0.36
graphite EPS 10mm
R 0.32
white EPS 10mm
R 0.28
glass wool 10mm
R 0.27
mineral wool 10mm
R 0.25
cellulose 10mm
R 0.24
timber 10mm
R 0.08
plasterboard 10mm
R 0.06
concrete 10mm
R 0.01

How to read this

  • Thermal resistance is the thickness in metres divided by the conductivity. Bigger is better.
  • The U-value adds 0.17 of surface resistance and then flips the total. Smaller is better.
  • Resistances add across layers, so a whole wall is the sum of its parts.
  • Conductivity varies by product; the values here are typical for the material.

Frequently asked questions

Q. What is the R-value of 10 mm of rigid polyurethane?

0.43 — 10 mm in metres divided by a conductivity of 0.023.

Q. And the U-value?

1.653. That is 0.6 — the resistance plus 0.17 of surface — turned upside down, and a square metre leaks 33.07 W across 20 degrees.

Q. How much concrete would match it?

0.7 metres.

Q. Which standards does it meet?

At 1.653 it does not clear any of them yet.