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RSI (metric R-value)
Symbol:  RSI 
Category:  Thermal resistance coefficient 
SI Equivalent:  1 K-m2/W
Dimension M-1T3Q 
System:  UK, US 
 
Notes
Typically used in the British building industry, one RSI corresponds to the heat insulation capability of a wall which maintains a temperature difference of 1°C while passing a heat flux of 1 W/m2.
Convert     RSI  
1 RSI =
Thermal resistance coefficient
  Symbol Unit Name
6.4591  clo  clo 
K-m2/W  kelvin meter squared per watt 
5.67446  °F-ft2-h/Btu (therm.)  R-value (imperial) 
10  tog  tog 
Glossary