The Hindhead tunnel is 1.83 kilometres long and required a spray-on waterproofing membrane solution for over 80,000m2 of the tunnel section. The product that was specified was MasterSeal 345, which is applied in a simple sandwich construction. The waterproofing system’s performance lies in the excellent bonding properties between the membrane and concrete lining on both sides, which mitigates the risk of water ingress by eliminating groundwater paths. In using this sandwich construction method three months of construction time was saved in comparison to more traditional options.
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