... Specification for SI units and recommendations for the use of their multiples and of certain other units1).BS 6399, Loading for buildings.BS 6399-1 ,Code of practice for dead and imposed loads. BS ... account to be taken of the variation of snow in the United Kingdom and the effect of redistribution of snow on roofs due to wind. Use of the uniformly distributed snow loads are subject to ... on a roof depending upon the wind speed, the wind direction, the type of snow, the external shape of the roof and the position and height of any surrounding roofs or obstructions. Therefore,...