Screed works for the new pygmy hippopotamus house at Duisburg Zoo

Summary

The contract covers screed works for the planned pygmy hippopotamus house at Duisburg Zoo. The work includes preparing the substrate; installing cement screed and, where needed, underconcrete; forming falls and joints; finishing around floor drains and drainage channels; shaping openings and ramps; sealing joints; impregnating the floor; and measuring residual moisture. Bidders must submit a priced bill of quantities in both PDF and GAEB formats. The contract will be awarded to the lowest-priced bid. The contract is not divided into lots, and variant bids are not permitted. The bill of quantities covers 145 m² of cement screed and 115 m² of underconcrete or sub-screed work. The planned average screed thickness is 75 mm, with strength class CT-C35-F6; in some areas the overall build-up may exceed 14 cm, and the screed must be installed without voids. The underconcrete must have strength class C25/30, a thickness of 60–120 mm and a planned fall of 1–6%. The scope also includes 105 m² of two-layer polyethylene foil, connections to seven floor drains, 19 m of drainage channels and 70 m² of floor impregnation. Work must take account of zoo visitors and animals; noisy or vibration-causing work must be coordinated, and zoo access and safety rules must be followed. At least one employee who speaks German fluently must be present on site throughout the work. The invitation gives a bid deadline of 29 October 2026 at 10:00, while the bill of quantities cover page gives a different deadline, 31 December 2026 at 11:00; the deadline should be checked against the official tender documents. The documents also state different work schedules. Bidders must provide references for screed works accepted within the previous five calendar years, the suitability declaration, and the required sanctions and anti-terrorism declarations.