Dealing with red algae on K-Rend and the removal of moss from worn tarmac, has it’s own specialist requirements
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.
Client also wanted his Tarmac areas cleaned and free from green moss
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.
Recent job completed in Carndonagh on a house with a fine dash exterior finish which had highly concentrated red algae infestation especially on the north and east facing walls. This job was performed as part of a pre-paint preparation.
As the algae present was quite heavy in places the walls were treated with environmentally friendly lightning cleanze algae treatment which has a fully biodegradable surfactant and poses no danger to plants or the environment when it is rinsed off. It is approved by both the Irish Pesticides Registration & Control Service (PCS) and UK Health & Safety Executive (HSE) for use as a softwashing biocide in Ireland and the UK.
The walls were treated with the first coat and allowed to work while we cleaned the gutters, PVC fascia and soffit before rinsing off and applying a second lower concentrate coat to kill the algae at the root and provide long lasting protection.
It is very important to treat and remove any surface algae before decorating. If the algae is left untreated and painted over it will continue to grow underneath and come through the newly decorated finish in a very short period of time.
As you can see from the before and after photographs, it turned out very well.