Insulation·white EPS 30mm
white EPS · 30mm
R 0.83
U 0.997 W/m²·K

white EPS, 30 mm — R 0.83

30 mm divided by a conductivity of 0.036 gives an R-value of 0.83. The U-value is 0.997, so a square metre leaks 19.93 W across a 20-degree difference.

Standards it meets

Not up to any of them yet

Material
white EPS
Thickness
30 mm
Thermal conductivity
0.036 W/m·K
Thermal resistance
0.83 m²·K/W
U-value
0.997 W/m²·K
Heat lost per square metre
19.93 W
As concrete
1.33 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 panel6 mm
  • phenolic foam17 mm
  • rigid polyurethane19 mm
  • extruded polystyrene23 mm
  • graphite EPS26 mm
  • glass wool31 mm
  • mineral wool33 mm
  • cellulose35 mm
  • timber108 mm
  • plasterboard150 mm
  • concrete1333 mm

Nearby cells

white EPS 20mm
R 0.56
white EPS 50mm
R 1.39
graphite EPS 30mm
R 0.97
glass wool 30mm
R 0.81

Same material, other thicknesses

white EPS 10mm
R 0.28
white EPS 20mm
R 0.56
white EPS 30mm
R 0.83
white EPS 50mm
R 1.39
white EPS 70mm
R 1.94
white EPS 100mm
R 2.78
white EPS 120mm
R 3.33
white EPS 150mm
R 4.17
white EPS 200mm
R 5.56
white EPS 250mm
R 6.94
white EPS 300mm
R 8.33
white EPS 400mm
R 11.11

Same thickness, other materials

vacuum panel 30mm
R 4.29
phenolic foam 30mm
R 1.5
rigid polyurethane 30mm
R 1.3
extruded polystyrene 30mm
R 1.07
graphite EPS 30mm
R 0.97
white EPS 30mm
R 0.83
glass wool 30mm
R 0.81
mineral wool 30mm
R 0.75
cellulose 30mm
R 0.71
timber 30mm
R 0.23
plasterboard 30mm
R 0.17
concrete 30mm
R 0.02

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 30 mm of white EPS?

0.83 — 30 mm in metres divided by a conductivity of 0.036.

Q. And the U-value?

0.997. That is 1 — the resistance plus 0.17 of surface — turned upside down, and a square metre leaks 19.93 W across 20 degrees.

Q. How much concrete would match it?

1.33 metres.

Q. Which standards does it meet?

At 0.997 it does not clear any of them yet.