The Alumasc range of calculation tools on the Drainage software are based on BS EN 12056, please check that the data has been correctly interpreted. Architects, Engineers and other users of this software must satisfy themselves in respect of the adequacy of the design. For complicated calculations please contact the Rainwater or Drainage technical team. Alumasc Exterior Building Products Ltd shall not be liable for any direct or consequential loss incurred as a result of the use of these calculators.
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