Tuesday, 7 September 2010 / 18:32
Most of the first course of trench blocks has been laid. Wooden stakes and various bits of metal have been hammered into the ground so that the top of each one is level with the existing damp course level.
The new walls must conform to the latest standard which means that there must be 50 mm of insulation and 50 mm of air gap in the cavity, so they’re 50 mm thicker than the existing walls, making them 300 mm thick.