18/03/2021
London Bridge forms a common bond to three jobs we've been busy with since the New Year. There was a bridge here in Roman times, probably of wood, and one of a succession of wooden bridges which got burnt down before the first stone bridge was begun in 1176. Continuing to form a major crossing point of the Thames to the present day, a new bridge was built with five stone arches in 1823-31, designed by Rennie, only to be replaced in 1967-72 by the present cantilevered concrete structure. Rennie's bridge was sold and rebuilt in Arizona!
To the south bank of the bridge is Southwark Cathedral, and on the north side in the City the church of St. Magnus the Martyr. Both have a history interconnected with the Bridge, and there lies the common thread between our work at both.
In the Middle Ages Southwark Cathedral was the priory church of St. Mary Overie, founded in 1106, and rebuilt in the 13th century. Little of that period survives, but remarkably the sides of the Priors Door are hidden on the north side of the nave. Skillingtons undertook a survey of this soot-blackened feature last year and have been cleaning and consolidating the stonework over the last couple of months. Cleaning was carried out primarily by a laser, consolidation using nanolimes to bind together crumbling limestone, dispersed lime to inject behind stone flakes, and more conventional lime mortars to bridge voids and point open joints. This was all done working closely with Kelley Christ, the cathedral's architect.
Kevin Haywood, consultant geologist, and Jackie Hall, archaeologist, worked alongside us. Cleaning revealed the types of stones originally present, including Caen, Reigate, Taynton and - most interestingly - the bowl to the adjacent stoup was found to be of Tournai marble - a rare surviving in situ of this stone in London. We looked closely at the mortars used as well, extracting sands to help us understand and characterise different phases of work - revealing bits of broken Roman bricks in the core mortars.
The London Bridge connection? Well, the building of Rennie's bridge in the 1820s instigated a major restoration programme to the old church, with the nave eventually being rebuilt in 1839-40. It was at that time that much of the medieval fabric was lost, leaving our doorway as a rare survival.