In article ,
Christopher Norton wrote:

The map of the united kingdom shows the various windspeeds as "Maximum
gust speed likely to be exceeded on the avarage only once in 50 years at
10m above the ground in open level country."

Ah. Interesting.

Londons figure is in the 38m/s band and is the lowest in the country.
You then use this map to design any requirements for the wind forces.

Yes, that's what I said.

My view for what it`s worth is that considering the MANY amendments we
have had for structural design over the past 5 years let alone the last
30 this code of practice should have been revised a long time ago.

Why? There is no evidence that the weather has changed significantly
in that respect (despite what the murdochs put in their headlines),
so it will remain good until that does happen. My guess is that
modern data would change it by only a few percent, which is irrelevant
in this context.


Regards,
Nick Maclaren.