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Concrete Cleaning and Heritage Restoration of The Cripps Building, St John's College Cambridge by Gunite

Heritage Restoration of The Cripps Building, St John’s College

Gunite was contracted by St John’s College to undertake the cleaning and heritage restoration of the Grade II* listed Cripps Building as part of a phased redevelopment scheme.

After carrying out initial cleaning and restoration trials, Stonehealth’s DOFF steam based stone cleaning system was identified as the most effective method for cleaning the concrete.

Sample defects were broken out and repaired using Remmers Betofix RM repair material to within 15mm of the surface of the concrete.

The final layer of the repair was formed from a pre-matched mortar mixed with a carefully selected range of crushed aggregate in the correct ratio to replicate the texture and appearance of the surrounding concrete.

The requirement for en-suite bathrooms risked compromising the structural integrity of the floor level. Carbon fibre plate bonding was proposed for strengthening around the new service holes. Jenkins and Potter were enlisted to design the scheme which was then installed using Sikadur 30 adhesive.

Our scope of works included:

Client St John’s College
Value £500K
Duration 1 year
Sector Heritage, Education
Accreditations 2018