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:
- 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
- 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
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