Driveways on Roofs and Plaza Decks
Driveways on Roofs and Plaza Decks – Heavy Duty Build-up Systems to Support High Loads
General Information Regarding Driveways on Rooftops
Loads: Driveways on rooftops require both a stable construction and adequate load-bearing capacity. 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 layers of growing medium.
Edging: 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 slip sheets may be required. The forces are then transferred into stable edging.
Pavement: The stone thickness has to be properly calculated and 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 truck 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.
|For light vehicles up to truck class 1:|
|Build-up height||from 5 ½ in.|
|Weight, saturated||from 58 lbs/sq. ft.|
|For trucks (class 2–8):|
|Build-up height||from 11 ½ in.|
|Weight, saturated||from 123 lbs/sq. ft.|