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Case Study
Canterbury Cathedral

We were tasked to sympathetically repair the substrate deck using sawn English Oak boarding followed by a new lead roof and rainwater system which was in addition to the fabric of this historical section.

The site is a two-storey corridor connecting the North East Transept to the Howley-Harrison Library, the Water Tower, the Dean’s Steps & Lift, and the Archive Library and Vestry. The building is Grade 1 listed and the site at and below ground level is a Scheduled Ancient Monument.
The Library Corridor is of C12th origin adapted in the C14th, C15th C18th and C20th. It is of outstanding architectural significance. It’s a heavily used part of the Cathedral. The Church community, visitors and tourists all occupy and use the corridor at various times.
The existing roof coverings had failed due to extreme carbonation to the underside. Moisture had also affected the oak substrate deck.

We were tasked to sympathetically repair the substrate deck using sawn English Oak boarding followed by a new lead roof and rainwater system which was in addition to the fabric of this historical section.

A stainless-steel gutter was preformed and clad in Code 8 sand Cast Lead to include wier`s. New hoppers were handmade in Code 8 Sand Cast lead using a hardwood former to recreate these in traditional style. Two of the hoppers have “WW1 2018” on them as the project received a grant from the First World War Centenary cathedral repair fund to carry out the works. The existing lead roof was removed, cleaned and carted away to recast to enable the existing lead to be used on the roof. Smaller rolls were manufactured to replicate the existing size.

In liaison with the Lead Contractors Association the recommendation in this instance was to lay the lead on building paper and treat the underside with Patination Cream.

The lead had to be warmed to assist dressing as the air temperatures were often near freezing.
The removal of the existing lead and timber had to be done in a controlled way as there was a significant amount of lead carbonation which could penetrate the room below.
A lined internal scaffold was erected and sealed prior to commencing any works.

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