Requirements A car park on the top of a 1950s building required major renovation to bring it up to modern day standards. The surface of the car park needed to be durable and waterproof, and various technical issues needed to be overcome. Architect Ignacio Martinez, commissioned by Sociedad Aspiegitura, initially proposed a classic waterproofing system for the car park, based on two asphalt sheets plus a 150mm layer of concrete on top of the s

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