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MTN data centre extension roofed with echo prestressed holow-core slabs
October 21,
2015 2072 2072 
Echo prestressed hollow-core slabs have been used to roof a second storey added to MTN’s Data Centre in Centurion, Gauteng.
The extension followed the use of Echo slabs to roof the original single-storey building built in 2012. The second storey has been built on the prestressed slab roof of the original structure. Grinaker-LTA was the main contractor and DSM Consulting Engineers was the engineering consultancy involved.
The prestressed roof slabs are 250 mm deep with spans of between of 2,2 m and 11,5 m. They are designed to carry live loads of 10 kN/m² and dead loads of 2,5 kN/m². They are mounted on precast inverted T-beams measuring 420 mm deep and 630 mm wide, which Echo subcontracted to ENCON to design and Civilcon to manufacture.
The beams have been installed on 6,5 m high reinforced cast-in-situ concrete columns, most of which feature rebar that protrudes through the slab roof to support solar panels and other plant to be mounted on the roof.
A lightweight politerm screed-to-falls has been installed over the slabs, followed by a second screed covering to take a dual layer of waterproofing.