ISG faced a number of complex heritage challenges on its £24m restoration of Temperate House in Kew Gardens.
A lack of maintenance in the largest remaining Victorian glasshouse in the world meant that it was deteriorating, with leaking gutters and render falling off. A government report determined that it was verging on being in an unsafe condition.
The project required ISG to remove and replace of 15,000 panes of glass weighing a total of around 57 tonnes, as well as the removal of all the paint, the old heating system, flooring and pathways and the restoration of the steps externally.
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