As is very common in the north west climate and especially on north and east facing exterior walls, red algae had really established itself and was very prominent on this property.

The degree of trentepohlia ( red algae) was extensive and we knew it would require a 2 phase attack to treat the problem and restore the K-Rend to its original state.

This required a softwash biocide formula that is specially prepared and is dependent on the extent of the works that need to be carried out by our fully trained professional operators.

In this instant a first coat was sprayed onto the whole property and is then rinsed off with clean water and per the request of the client the boundary retaining walls were also treated.

We then returned within 7 days to apply a seal coat that penetrates deep into the porous substrate and is not rinsed off. This solution continues to fight all future algae and funghi growth for years to come, keeping the K-Rend finish looking as it should.

Before After

The big problem with is that it’s often cleaned repeatedly using high pressure power washers and over time the top layers of stone chipping become exposed and a haven for the build up of dirt and mosses.

The easiest solution for us would’ve been to do the same but in doing so would’ve done more damage to the drive.

Our solution was to initially kill all the moss growth and when we returned to apply the second coat to the walls we were able to brush the dead moss off the top of the tarmac and using the pressure washer with a low pressure, wide spray, rinsing nozzle we were able to remove all the dirt and mud that had collected between the stone chippings without further damage to the tarmac surface.

We have recommended to the client that he would now need to have a bitumen seal coat applied to finish and protect his drive which he’s now considering.

 

Around the oil tank and partition fencing was particularly dense.