Basic Snow Load on the Ground for UK & Ireland
Note that a roof slope of 30°, ui = 1.2 on the leeward half of the roof which would increase the loading to 0.72 kN/m2.
Similarly substantial drifts can accumulate in valleys, behind parapets, and against neighbouring higher buildings, and these can lead to significantly higher snow loads for particular areas.
This would affect the permissible span for the cladding, and normally the purlin spacing would have to be reduced to support the additional load.
1: Basic snow load on the ground, sb, in kN/m²
2: Ground level is assumed to be 100m above mean sea level.
Map from BS6399: Part 3: 1988 & The Environmental Research Unit on the basis of snow depth data supplied by The Meteorological Service.
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