Insulation·plasterboard 100mm
plasterboard · 100mm
R 0.56
U 1.378 W/m²·K

plasterboard, 100 mm — R 0.56

100 mm divided by a conductivity of 0.18 gives an R-value of 0.56. The U-value is 1.378, so a square metre leaks 27.57 W across a 20-degree difference.

Standards it meets

Not up to any of them yet

Material
plasterboard
Thickness
100 mm
Thermal conductivity
0.18 W/m·K
Thermal resistance
0.56 m²·K/W
U-value
1.378 W/m²·K
Heat lost per square metre
27.57 W
As concrete
0.89 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 panel4 mm
  • phenolic foam11 mm
  • rigid polyurethane13 mm
  • extruded polystyrene16 mm
  • graphite EPS17 mm
  • white EPS20 mm
  • glass wool21 mm
  • mineral wool22 mm
  • cellulose23 mm
  • timber72 mm
  • concrete889 mm

Nearby cells

plasterboard 70mm
R 0.39
plasterboard 120mm
R 0.67
timber 100mm
R 0.77
concrete 100mm
R 0.06

Same material, other thicknesses

plasterboard 10mm
R 0.06
plasterboard 20mm
R 0.11
plasterboard 30mm
R 0.17
plasterboard 50mm
R 0.28
plasterboard 70mm
R 0.39
plasterboard 100mm
R 0.56
plasterboard 120mm
R 0.67
plasterboard 150mm
R 0.83
plasterboard 200mm
R 1.11
plasterboard 250mm
R 1.39
plasterboard 300mm
R 1.67
plasterboard 400mm
R 2.22

Same thickness, other materials

vacuum panel 100mm
R 14.29
phenolic foam 100mm
R 5
rigid polyurethane 100mm
R 4.35
extruded polystyrene 100mm
R 3.57
graphite EPS 100mm
R 3.23
white EPS 100mm
R 2.78
glass wool 100mm
R 2.7
mineral wool 100mm
R 2.5
cellulose 100mm
R 2.38
timber 100mm
R 0.77
plasterboard 100mm
R 0.56
concrete 100mm
R 0.06

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 100 mm of plasterboard?

0.56 — 100 mm in metres divided by a conductivity of 0.18.

Q. And the U-value?

1.378. That is 0.73 — the resistance plus 0.17 of surface — turned upside down, and a square metre leaks 27.57 W across 20 degrees.

Q. How much concrete would match it?

0.89 metres.

Q. Which standards does it meet?

At 1.378 it does not clear any of them yet.