• Peter

Girrawheen - commercial carpark - subsidence

The photo below shows a subsidence which appeared in a commercial carpark in Girrawheen.

#commercialcarpark #subsidence #patch #repair #girrawheen #commerical #asphalthotmix


Below are 2 photos of the subsidence being excavated to locate the source.


The carpark is many years old and was constructed without the sub-base being totally cleared of vegetation which has resulted in a tree stump rotting away over the years, creating a cavity and then a subsidence.


We excavated the remains of the tree stump, backfilled with clean fill and compacted in 150mm layers.



A 200mm thick gravel base was installed, compacted and waterbound - followed by sealing with a bitumen tack emulsion and a 50mm thick layer of 10mm granite black asphalt/hotmix to seal.


The surface was cooled down with water and sprinkled with a layer of sand to allow for immediate traffic use. The sand prevents tyre scuffing on the newly laid surface.

#asphalthotmix #carpark #repair #subsidence #pothole #patching #commerical

6 views0 comments