Background

The UN House building is situated on Plot No 11867, along Alick Nkhata Road, Longacres, Lusaka, Zambia. The building is five storeys high and is occupied by UNDP,UNICEF,UNFPA and UNDSS.

Every rain season, the UN House experiences roof leakages, which affect Offices on the 4th floor of the building. Over the years, the Common Premises Team has undertaken several remedial repairs which have not fully resolved the problem. In 2018, the Common Premises Management Team came to an agreement to demolish the existing ‘false’ roof and install a new Hipped Roof structure to rectify the problem completely.

In this regard, a structural analysis was undertaken to assess the possibility of adding an additional floor with a hipped roof to the UN House building. The findings of the structural analysis cautioned against adding any significant/ large loads to the building. Therefore, as an additional precaution, a decision to construct a Light Steel Frame Hipped Roof was deemed acceptable.

The previous ‘false’ roof has been demolished and cleared to pave way for the new roof installation works. The current condition of the site is a concrete slab with a 900mm dwarf wall around the perimeter.

Purpose of Assignment  

To design and install a Light Steel Hipped Roof structure on the UN House building to mitigate against roof leakages. The execution methodology shall be provided in the technical proposal by the Contractor.