Complete renovation of the stained glass windows in the art nouveau style in a 6-storey staircase. On the site : Removing the stained glass on the 6 floors and installing temporary protection for the openings In the workshop: The dismantling of the stained glass windows by the removal of the old lead. Cleaning both sides of the glass and replacing broken parts. Reassembling the stained glass into new lead mesh Stained glass window sealing and strengthening. On site: Installing the stained glass windows using linseed oil mastic.