Colchester Castle Museum

Colchester Castle Museum is a 1950’s steel framed building housed within the existing walls of Colchester Castle, which is a scheduled ancient monument as defined in the Ancient Monuments and Archaeological Areas Act 1979 (as amended) Section.

Repair works to the roof covering was put out to tender mainly to roofing contractors as the major part of works related to the application of a Sika LPL liquid applied membrane system. Works were also specified for the repair of the concrete elements of the roof lights.

In addition to our concrete repair capabilities, our operatives hold CSCS cards in liquid membrane application and we are an approved installer. We were therefore able to provide a cost effective quotation for all the works.

The contract was required to be carried out in a 4-week period prior to the May Bank holiday weekend whilst the Museum was closed. Detailed forward planning and sequencing of the work together with strict procurement and delivery of plant and materials was vital to meet the very tight programme.

Extensive protection was no required to the listed structure both internally and externally and also to artefacts within the Museum.

Scaffold access towers to the roof were not permitted due to the Castle’s listed status therefore all materials and plant was manually carried up the Great Stairs. Journeys down the stairs for meal and comfort breaks were not wasted as all arisings were removed from the roof at the same time.

Concrete repairs were carried out to the central roof light structure using a polymer modified hand placed repair mortar followed by application of a fairing coat and anti-carbonation coating.

The existing asphalt roof covering was cleaned and over coated with the Sika LPL Gamma 20 system, which offers a 20-year guarantee.

Although additional works were instructed during the contract the works were still completed in time for the Museum to reopen as scheduled.

The benefits of a liquid applied system over traditional asphalt were clearly demonstrated on this project, not only by access issues but also by the reduction of fire risk and potential issues that bad weather could raise.