Insulation·white EPS 200mm
white EPS · 200mm
R 5.56
U 0.175 W/m²·K

white EPS, 200 mm — R 5.56

200 mm divided by a conductivity of 0.036 gives an R-value of 5.56. The U-value is 0.175, so a square metre leaks 3.49 W across a 20-degree difference.

Standards it meets

  • loose standard 0.30
Material
white EPS
Thickness
200 mm
Thermal conductivity
0.036 W/m·K
Thermal resistance
5.56 m²·K/W
U-value
0.175 W/m²·K
Heat lost per square metre
3.49 W
As concrete
8.89 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 panel39 mm
  • phenolic foam111 mm
  • rigid polyurethane128 mm
  • extruded polystyrene156 mm
  • graphite EPS172 mm
  • glass wool206 mm
  • mineral wool222 mm
  • cellulose233 mm
  • timber722 mm
  • plasterboard1000 mm
  • concrete8889 mm

Nearby cells

white EPS 150mm
R 4.17
white EPS 250mm
R 6.94
graphite EPS 200mm
R 6.45
glass wool 200mm
R 5.41

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 200mm
R 28.57
phenolic foam 200mm
R 10
rigid polyurethane 200mm
R 8.7
extruded polystyrene 200mm
R 7.14
graphite EPS 200mm
R 6.45
white EPS 200mm
R 5.56
glass wool 200mm
R 5.41
mineral wool 200mm
R 5
cellulose 200mm
R 4.76
timber 200mm
R 1.54
plasterboard 200mm
R 1.11
concrete 200mm
R 0.13

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 200 mm of white EPS?

5.56 — 200 mm in metres divided by a conductivity of 0.036.

Q. And the U-value?

0.175. That is 5.73 — the resistance plus 0.17 of surface — turned upside down, and a square metre leaks 3.49 W across 20 degrees.

Q. How much concrete would match it?

8.89 metres.

Q. Which standards does it meet?

At 0.175 it clears 1 of them.