15 Clerkenwell Close is a building in Islington, London, designed by architects GROUPWORK with structural engineer Webb Yates Engineers, completed in 2017. The building's stone façade was controversial when it appeared, as the precise location of rough and smooth stones had not been fully detailed in the building's planning documents. Cllr Martin Klute of Islington Council called for the building's demolition, but this was overturned on appeal. The building won a RIBA National Award in 2018 and was one of six buildings shortlisted for the Stirling Prize in 2021. The building is highly innovative, using the first construction of a multi-level trabeated system of end-shaped, rusticated massive-precut stone blocks.
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15 Clerkenwell Close in the context of Massive precut stone
Massive-precut stone is a modern stonemasonry method of building with load-bearing stone. Precut stone is a DFMA construction method that uses large machine-cut dimension stone blocks with precisely defined dimensions to rapidly assemble buildings in which stone is used as a major or the sole load-bearing material.
A key technique of massive-precut stone ("MP stone") is to specify precut stone to precise dimensions that match the architect's plan for rapid construction, typically using a crane. The blocks may be numbered so that the masons can follow the plan procedurally. The use of massive stone blocks has several benefits, listed below.