London Wall, situated in the heart of the City of London, is set amongst parts of the original London Wall and St Alphage Church built in Roman times. Different areas of this project all had their own requirements, and some needed development from their original form at tender stage.
Yorkstone paving area and Salters Gate
The original specification for this area was Scoutmoor Yorkstone. CED priced for an alternative Yorkstone. To ensure that all parties were happy with the alternative, a full-size sample panel was supplied as a benchmark for the order. Full technical details with updated test results were also supplied for all those involved to view and comment. After lots of discussions, the order was placed.
The Yorkstone supplied was selected for its blue/grey colour with only 5% buff colouration. Coal content quantity was also very important, the client did not like the heavily coaled paving so a small selection process took place at the quarry to avoid any heavily marked pieces from being supplied.
1500m2 of 63mm-thick paving, 90 steps, risers, and also a small number of setts with stainless steel insert visibility strips were supplied to the Priory and Salters garden areas.
Black basalt water feature
This was an immense project with lots of detail and CAD drawing work, very tight tolerances and finishes to the stone not previously used for any other project.
A scaled-down mock-up was produced and air-freighted over at the start; this was then viewed at Frosts' premises along with Make Architects, Spacehub and Brookefield Multiplex. The mock-up contained a variety of finishes and shapes to enable the final design to be chosen for the main order.
A big challenge was designing and producing an anti-pedestrian finish to the top of paving which was going to be used along the edges of the water feature, which were at ground level and therefore had the potential for pedestrians to walk into the lowered pool section.
70 tonnes of black basalt will make up the main water feature.
This area, situated next to the 14th Century remains of St Alphage church tower, is to mimic the quality and finishes supplied to the water feature. It is a staged seating area on different levels consisting of large steps and risers. The specially designed split-top finish which is used on the water feature is also used in certain areas of the Clamber Terrace to act as a deterrent for pedestrians.
30 tonnes of black basalt will make up the Clamber terrace area.
CED is also supplying various basalt steps and paving for various areas to the rest of the site as well as black Icelandic pebbles.