Sellar – The Shard

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Main Contractor

Mace Construction

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Renzo Piano and Adamson Associates

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Scope and area of work on the project involved the structural waterproofing and cladding to the spire area of The Shard and the lower level back of the house plant room and decking to the public viewing gallery at level 72. Due to AC’s experience in using a variation of waterproofing and cladding products, Mace didn’t need to work with numerous sub-contractors.


We carried out works to the central steel core between levels 67-86. This was fireproofed and insulated with a Promat shaft wall system set internally within the steel structure. External to the steelwork we cladded the central mast with interlocking Trimoterm panels. There were then surfaces fitted with a decorative Reynobond composite panel. We also provided stainless doors and angles to risers at the five lift entrances.

All flat waterproofed areas on the project ranging from ground floor to level 72 were ‘inverted roof’ scenarios with fully bonded Hydrotech membrane fitted direct to the structural slab. An extruded insulation board was then fitted on top of the waterproofing. Roof areas were then finished with washed ballast or 600 x 600 paving slabs.

Within house plant areas on levels 29, 30, 51, 66 and 67, we utilised the Trimoterm composite panels and a range of powder-coated flashings to protect lower floors against any pipework failures.

To low-level evacuation corridors, we laid fibre reinforced Isopol unbonded screed that was eventually painted with Flowcrete Flowcoat SF41 waterproof paint.


The fully bonded system ensures water is not able to track through any punctures in the membrane and the waterproofing is protected from direct sunlight and weathering.  We also fitted ventilation louvre blades to the main plant area of The Shard, also known as the ‘back pack’ area, to prevent the densely populated plants from overheating in this area.