A hall located in Salo consists of two parts. Combined with an opening providing access to either part, they function as a big working space and a warehouse. It was about the time to renew the cover of one of those hall parts. The hall under work, is 50 m long, 30 m wide, and the rooftop height is 12 metres. This job was made a challenging one by the joining of two halls together. For this purpose, a professional worker and a lifting platform bigger than usual were required, in order to be able to weld two pieces of the fabric together on the roof.