Durox and Toplite blocks may be used to construct cavity and solid external walls. For cavity construction the minimum width will normally be 90mm. Durox blocks are suitable for a range of external finishes as shown in the table below.  In a single leaf wall the minimum width of Durox and Toplite, with or without rendering, may be selected from BS 5628-3.

In cavity walls, Hemelite or Topcrete may be used for either or both leaves, normally with a minimum width of 90mm. When used for the outer leaf, the blockwork should normally be rendered or clad. When the cavity is not to be fully filled with insulation, a clear cavity of 50mm minimum width should be maintained, excluding the width of any insulation. In a single leaf wall the minimum width of blockwork, with or without rendering, may be selected from BS 5628-3.

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