Tel: 0808 123 1214
Pebble Dash Cleaning
Pebble Dash Cleaning
COMMERCIAL - DOMESTIC
EXTERIOR CLEANING CONTRACTOR
Algal growth on exterior masonry surfaces given the high temperature and rainfall of the region is now becoming a maintenance issue for many home owners, domestic or commercial
landlords and housing association. These biofilms grow virtually everywhere, in almost any environment where there is a combination of moisture, nutrients, and a surface.
How do they colonise the render?
The spores are usually blown onto the render by the wind where over
time they colonise helped by the ever wetter climate. The walls that
take the brunt of the weather have a higher levels of colonisation but it
can be on all the property walls. Localised growths will also occur
where there is a leaking gutter or downpipe keeping the wall moist.
The problem is an aesthetic as well as an economic one. Species are
mostly yellow to bright orange or red-brown in colour, due to the orange
pigment or black in colour.
The biofilm can be removed using our Softwash System and the render
treated on a two or three yearly basis to prevent further colonisation.
If left untreated the most common contaminants on walls are the
pigment producing Aureobasidiumsp sp., and Cladosporium sp. and
These species will rapidly spread and colonise many surfaces causing
disfigurement and decay by the release of pigments and acids
Softwashing is the application of a chemical wash onto the substrate by means of a low pressure pump and normally a telescopic pole.
Assessing the Substrate: Pebble Dash Roughcast K Rend
It will depend on the substrate the level of contamination as to which chemical system is used.
System 1) A hypochlorite based softwash biocide
System 2) A Biocidal Wash (DDAC)
System 1) A hypochlorite based softwash biocide which at 5:1-10:1 dilution is classed by the EU, PCD and HSE as non corrosive or hazardous to people or the environment. This
solution contains no acids or solvents does not bio-accumulate and the surfactant is fully biodegradable and after use it quickly breaks down into tiny amounts of ordinary salt and
System 2) A Biocidal Wash (DDAC) fully biodegradable does not bio-accumulate Ph neutral, so safe for children and pets once treated surface is completely dry.
The application of a Softwash Solution via a very low pressure nozzle and pump. The Softwash solution is sprayed onto the wall or in some instances it is brushed on.
System 1: The hypochlorite solution is sprayed onto the wall and then left for 30-60
minutes before being rinsed of. It may require more than 1 treatment to bring the walls
up to an acceptable standard. The final step of the process is to treat the wall with the
inhibitor solution. Results are normally seen within 3-24 hours of application.
System 2: The application of a (DDAC) solution. The wall is saturated with the solution
which is not rinsed off but just left to dry. This system can take up to 1 year to fully
clean but some noticeable difference should be seen within a few months.
Softwash Solution application is at an extremely low pressure (no more than your garden
Preperation for Softwashing
We will cover the garden area as required with tarpaulins covering any shrubs or planted area. If the wall has a climbing plants it
is best to remove these from the wall. The drive should be clear as we will be moving our equipment around also all pets and
children must not be allowed to access the site during the cleaning process and only be allow onto the area once it is completely
The results that can be achieved
Pebble Dash Cleaning (results can be achieved the same day for some works)
Roughcast (results can be achieved the same day for some works)
From: Glenrothes Customer
I have used Cotec twice now over the past 6 years and cannot recommend
them highly enough. They undertake the work to a very high standard and
the clean up operation was exceptional. Sam even came back at a later date
with a replacement tile that he had discovered to repair a slightly cracked
one in my roof. There are a number of companies advertising similar
services but I would be surprised if anyone can match this standard. All work
completed as per the Statement of Work, on time and at the agreed price. I
will certainly be using them again in two years time when the roof needs
Feedback Published: Sep
Work done: Jul 2020
What Our Customers Say