The Metquarter is a multi-use complex located in the heart of Liverpool City Centre. The former Liverpool General Post Office building now houses numerous shops, food outlets and on its upper floors, the LMA, a media, music and performing arts institution co-owned by global superstar Robbie Williams.

The large roof area was suffering from a number of water ingress issues, causing damage internally to the building. The roof had exposed concrete pads, with no waterproofing upon them, leaving the areas exposed to the elements. The internal roof gullies were also a cause for concern with an inverted waterproofing system greatly reducing water flow to the outlets.

One of the biggest challenges on this project was the inverted roofing system located within the internal gullies. This comprised of approximately 120 tonnes of ballast across the whole roof, holding the insulation in position. This ballast was reducing waterflow in the gullies, leading to ineffective drainage. It was decided that the ballast was to be removed from the roof area, so the gullies could be waterproofed with insulation laid in a traditional built-up roofing system.

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