vacuum panel · 300mm
R 42.86
U 0.023 W/m²·K
vacuum panel, 300 mm — R 42.86
300 mm divided by a conductivity of 0.007 gives an R-value of 42.86. The U-value is 0.023, so a square metre leaks 0.46 W across a 20-degree difference.
Standards it meets
- passive house 0.15
- Korean central-region wall 0.17
- loose standard 0.30
- Material
- vacuum panel
- Thickness
- 300 mm
- Thermal conductivity
- 0.007 W/m·K
- Thermal resistance
- 42.86 m²·K/W
- U-value
- 0.023 W/m²·K
- Heat lost per square metre
- 0.46 W
- As concrete
- 68.57 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.
- phenolic foam857 mm
- rigid polyurethane986 mm
- extruded polystyrene1200 mm
- graphite EPS1329 mm
- white EPS1543 mm
- glass wool1586 mm
- mineral wool1714 mm
- cellulose1800 mm
- timber5571 mm
- plasterboard7714 mm
- concrete68571 mm
Nearby cells
Same material, other thicknesses
Same thickness, other materials
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 300 mm of vacuum panel?
42.86 — 300 mm in metres divided by a conductivity of 0.007.
Q. And the U-value?
0.023. That is 43.03 — the resistance plus 0.17 of surface — turned upside down, and a square metre leaks 0.46 W across 20 degrees.
Q. How much concrete would match it?
68.57 metres.
Q. Which standards does it meet?
At 0.023 it clears 3 of them.