More pressure being put on councils to provide intrusive fire risk assessments on high rise tower blocks (type 4). This involves opening up parts of walls and looking into voids beyond the scope of a normal type 1 fire risk assessment. The argument against is that the intrusive surveys can cause damage that is never quite the same once made good and the argument for is that you potentially expose hidden fire spread areas not seen by the naked eye. I think everything needs to be taken into account, the type of building, whether there is cladding, what type of cladding, the history of the building, the findings of any past fires within the building. If in doubt, you should do a type 4 and we can provide these should you require one.