1 Bank Street

Due to the development’s construction on 25 metres of reclaimed land in a high water table area, Byrne Bros, the concrete contractors selected by the project’s clients, Canary Wharf Group, required a proven, high performance system to put a long-term watertight seal on the basement. Sika’s waterproof solution proved ideal for the task.

The building’s concrete basement was designed to meet the requirements of a Grade 2 environment to BS 8102: 2015. It will contain a car park and vital plant equipment, hence a range of Sika products were used to provide the maximum waterproof protection to its reinforced raft slab. These included Sikaproof® A-12, a highly-durable, watertight membrane, and Sika® Watertight Concrete powder, a powerful state-of-the-art admixture. SikaSwell®-A profiles, which swell in contact with water, were used to seal the basement’s construction joints.

Vulnerable joints within the basement’s walls, which contained Sika® WT-200, a powerful, crystalline waterproofing admixture, were bolstered with SikaFuko® – a range of solid core PVC Injection Hose Systems. Sika® Metalsheet FBV, a coated metal sheet with excellent adhesion to fresh concrete, was used in the structure’s kicker joint. Sikalastic®-1K, a flexible, fibre-reinforced mortar, was applied to pile heads and faces at slab interface junctions, whilst a Sika® Cavity Drainage membrane provided the basement’s south-east wall with a secondary layer of waterproof protection. SikaProof® P-12, a permanently-bonded, self-adhesive composite sheet membrane system, added a watertight layer to the basement’s toe projection. SikaProof® A-12, a composite sheet membrane, added a waterproof layer to the water-retaining dock wall.

The 1 Bank Street building is scheduled for completion in 2019. Its future as a landmark addition to Canary Wharf’s imposing and spectacular skyline will be long-term safeguarded at its base by Sika’s superior waterproof system.