1. 

   Jiv New Member

   I know the number relates to the compressive strength of the blocks, but I'm unsure where the 7N ones would be used in preference to the 3.5N ones.
   
   Any ideas?

    

   Jiv, Apr 4, 2007

   #1
2. 

   ­ New Member

   When the build is over 3 storeys or where point loads are expected.

    

   ­, Apr 4, 2007

   #2

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