In a writ filed at the Technology and Construction Court, Eurostar is claiming costs associated with investigating and rectifying the defects. The writ says: 鈥淪ome of the glass panels comprising the walls and roof have suffered 鈥榥ickel sulphide stone expansion growth鈥� which has led to their failure.
鈥淔urther, the methods of installation of the glass panels has led to a significant number of defects such as damaged panels, incorrect tolerances, loose, missing, misaligned and damaged fittings and sealants.鈥�
Eurostar is blaming construction manger Bovis Construction, architect Nicholas Grimshaw & Partners, cladding subcontractor Briggs Amasco Curtainwalling and the subcontractor鈥檚 parents Tarmac (BA) and Tarmac Holdings for the defects.
The claim against Tarmac is being handled by the demerged materials arm, Tarmac, rather than by contracting division Carillion.
The problem first came to light almost two years ago when tarpaulins were installed under the glazed canopy of the train shed roof for safety reasons.
Ove Arup Facade Engineering compiled a report on the problems for Eurostar and is understood to be advising on solutions so the tarpaulins can be dispensed with.
A source close to the project said about six panels had failed because of nickel sulphide inclusions, where small particles of nickel sulphide in the glass expand after heating and the panels crack or break.
A number of solutions have been proposed to stop more panels failing, including the installation of steel mesh under the roof to replace the tarpaulin.
Tim Maddock, an associate with lawyer Clifford Chance, which is handing Eurostar鈥檚 claim, said it was difficult to estimate the value of the claim but that it could be worth up to 拢10m.
Bovis refused to comment and Tarmac said that its lawyer was investigating the claim. Nicholas Grimshaw & Partners said: 鈥淭his is nothing to with us and we deny that we have any responsibility.鈥�
Waterloo International finished in 1993 and cost 拢130m. It started on site in December 1990.
