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  One approach to achieving L2 compliance involves proving that the average solar load per unit floor area is not greater than 25W/m2 when subjected to a given level of irradiance.

Appendix H of L2, which explains the procedure fully, requires a reduction factor to be incorporated into the calculation. It does not however offer a reduction factor for brise soleil. Based on an overhang of 60% of the depth of the window on a south facing facades, the following correction factors can be used for this method of calculation.
 
 
  Correction factor 0.38

Very wide openings. (ie. where the width of the window and solar shade are at least 5 times the height of the window).
 
 
  Correction factor 0.45

Wide openings. (ie. where the width of the window and solar shade are at least twice the height of the window).
 
 
  Correction factor 0.52

Square openings. (ie. where the width of the window and solar shade is equal to the height of the window).
 
 
  Correction factor 0.63

Narrow openings. (ie. where the width of the window and solar shade is less than the height of the window).

Abstracted from BRE IP17/03
 
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  Dales Fabrications Ltd, Crompton Road Industrial Estate, Ilkeston, Derbyshire. DE7 4BG • Tel: 0115 930 1521 • mail: sales@dales-eaves.co.uk