Public Tender Vob/Asenovation Of The Roof Area Of The Waste Transfer Hall The Trapezoidal Sheet Metal Roofing Of The Hall, Which Is Around 20 Years Old, Shows Rusting Through Where The Sheets Overlap Across The Entire Width Of The Hall. The 28 Existing Smoke And Heat Extractors (Rwa) Are ...  Morethe Trapezoidal Sheet Metal Covering Of The Approximately 20-Year-Old Hall Shows Rusting Through Where The Sheets Overlap Across The Entire Width Of The Hall. The 28 Existing Smoke And Heat Extractors (Rwa) Are In Need Of Overhaul, As Are The Security System And The Ladder. The Renovation Of The Damaged Areas And The Integration Of New Rwa And Covers Into The Old Structure Of The Roof Covering Would Not Be Economical Due To The Foreseeable High Time And Personnel Costs. For This Reason, This Tender Includes The Renewal Of The Roof Covering Including Rwa, Parapet, Gutter, Verge Cover, Ladder And Security System. According To The Current Industrial Construction Guidelines, The Number Of Rwa Can Be Reduced. In This Context, Therwa Are Manufactured As Rigid, Maintenance-Free Openings.