Surface thermal resistance. Inside/outside?

Dec 30, 2004 1 Replies
I

In a PDF I downloaded (Examples of U-value calculations using BS EN ISO 6946:1997)



I find a table "Surface resistance for roofs, walls, and exposed floors m^2K/W".



Heat flow direction Upwards Horizontal Downwards Inside resistance 0.10 0.13 0.17 Outside Resistance 0.04 0.04 0.04 Underfloor space - 0.13 0.17


Is the difference between inside and outside just that wind is assumed to be blowing across the outside?


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A

Yes, although the figures you quoted are somewhat different from the ones I'm familiar with (from BRE Digest 108):

  • 0.10 0.12 *0.14*
  • 0.04 *0.06* 0.04
  • *0.22*

See also building regs. Approved Document L1 for up-to-date tables of U-values and calculation methods.

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