Cross Laminated Timber in Place of Cast in Situ Concrete Slabs

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Mace installed 6000m2 of cross laminated timber (CLT) at Harwell NSTF in place of cast in situ concrete slabs.

Using this method had many benefits which are detailed below:

Sustainability:

  • 36% carbon saving compared with a concrete frame (1,200 tCO2e for concrete and 770 tCO2e with CLT)
  • No silica dust generated (air quality benefits)
  • CLT can span further than composite metal decking (the obvious alternative), meaning that the number of steel elements was reduced
  • Reduced embodied carbon

Health & safety:

  • Installed with a guard rail as edge protection at ground level prior to lifting
  • CLT has integral fire resistance properties
  • Fully dry installation eliminating wet trade
  • No hot works for shear stud installation
  • Reduced weight allowed large sections of CLT to be placed reducing working at height – only limited by transportation size limits
  • Panels shipped to site pre slung so reduced access to lorry required

Programme/Performance:

  • CLT provided a 40% programme saving over the equivalent concrete floor slab
  • MEP interfaces easily installed, and roof and floor finishes could be applied directly which allowed earlier watertight and fit out to commence.
  • No temporary works or cure time for concrete
  • CLT weight is ~6.0kN/m3 as opposed to 25kN/m3 for concrete (reduced foundation load) allowed change from piled foundation to ground beams
  • Off-site manufacture and quality control
  • Airtight due to lapped joint detailing
  • Flat underside allows direct application of decorative finish

To find out more, click the link below.

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Entry submitted by Mace


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