New high end development in West London. Problem caused in stairwells and stud walls were standard procedure has failed to achieve necessary DB ratings.
We decided on a retro fit to inject polyurethane acoustic foam into the step curvature by injection at intervals of quarter of a metre. The holes were 5mm in diameter. The stud walls have the same treatment. After installation the holes are made good. The project takes 1 full day and means structure is kept in place without disturbance.