Monday, March 08, 2010

Shaken structures and beliefs

OK. OK!.  I understand.

In winter be careful about snow and ice falling from rooftops.

 

OR IF YOU ARE IN SWEDEN:

roofs_2010-03-08_172439

(via)

The minister (Environment Minster Andreas Carlgren) pledged the imminent introduction of amendments to Sweden's construction and planning laws following a meeting on Thursday with a range of government agencies.
Snow levels recorded this winter in no way exceeded the projections that form the basis for accepted construction norms, said Carlgren.
"It's not acceptable that the roofs have collapsed on buildings that are supposed to be able to house the general public," he said, following a winter that has seen roofs cave in on everything from vast supermarkets to a range of sports halls.

and here were my comments.published in The Local, on 1st March when the ICA roof collapsed in Kristinehamn:

 

I wouldn't find it unusual that roofs collapse under snow in,hmm, Jamaica? Martinique? Maybe even Florida. But, this IS Sweden is it not? These are PUBLIC buildings, like supermarkets, sports halls, etc.


It is time for Bygningskontrol and the government to revise the specification standards to accommodate extreme weather conditions in this supposed age of 'global warming'.


There is something fundamentally wrong in roof specs when this can happen. Materials calculations and consequent stress/load specs are failing to meet the conditions.

Prosecutions would be meaningless if the kontroll specs themselves are too 'finely calculated'. A margin of at least 50% extra in materials strength would not be excessive. In Sweden the materials cost is roughly only 33% of building cost - the rest being labour,design,consultancy, etc. costs.


It is to be most sincerely hoped that no-one is killed - it's a disgraceful way for society to learn a lesson.


If you are going to buy a house, build a building, a well-angled roof is a pretty good idea and snow cannot build up on it to any great thickness.Plus, if it's black, then what little sunshine we do get in winter heats the roof and assists with insulation,saving energy costs.

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