GardenBanter.co.uk - View Single Post

11-10-2003, 09:02 AM

The message
from (Nick Maclaren) contains these words:

In article , Ric wrote:

Interested to know how they derived those figures, and whether builders are
legally required to use those figures. I wouldn't worry about your house
blowing down - even the lowest figure (for London) is over F12 on the
Beaufort scale and barely survivable in the open.

Dunno. The reference is:

CP3: Chapter V: Part 2: 1972. Wind Loads. British Standards
Institution.

Regards,
Nick Maclaren.

/me reaches for his copy of above standard.

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."

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.

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.

Maybe, just MAYBE when all British Standards are no longer British
Standards but BS EN standards or ISO standards then it will be taken off
the design listing.

To give an indication of how many revisions we have had over 30 years in
my particular field - roof trusses - our code BS5268 pt 3 was not even
written in 1972. Nor was it`s predicessor cp112!!!!!! I have had 4
revisions of BS5268 pt 3 in my career with the major one in 1998. It`s
now on the table to become a European code with all that that entails.
We have also had part of BS5268 pt 3 taken out and become it`s own code
of practice. BS EN 1059 which is the manufacture part of it. This then
goes on to state that you will need ISO 9000 accreditation when BS 5268
pt 3 is made into the Eurocode. I spend alot of time no longer dealing
with the stiff end of roof truss design but on making sure we have all
our required practices in place.

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