Housing

‘Majority of homes damaged by defective blocks need to be knocked down’

Expert on concrete technology says if there are cracks in the walls ‘and at the same time you have internal sulphates discovered . . . you don’t have an option – you have to demolish’

Dr Andreas Leemann: ‘Right now the foundations have been excluded from the scheme. This is a decision that was not based on data – it was based on assumptions’