Driveways on Rooftops and Unterground Garage Decks – Heavy Duty Build-up Systems to Support High Loads

Driveways on rooftops require both a stable construction and adequate load-bearing capacity. Additionally to the self-weight and imposed loads on driveways, horizontal forces and torsional movements may occur through acceleration, steering or breaking.

System build-up

Loads

As wheel loads lead to enormous concentrated loads due to their relatively small surface area, sufficient load distribution has to be available. This can be achieved through the use of load-distributing plates or through sufficiently thick substrates.

Surrounds

Steering, breaking and accelerating on driveways can lead to enormous horizontal forces being created. In order to direct these forces away from the roof’s waterproofing, measures such as laying slide bearings may be required. The forces are then contained by stable surroundings.

Stone thickness

The stone thickness should be selected in accordance with the loads. Lesser loads (e.g. cars only), do not call for the paving to be as strong as if used with higher loads. When both car and lorry traffic occur, the rolling structural loads can lead to distortions. Selecting a larger stone thickness will result in a larger bearing surface between the stones, which will do more to counteract distortions.