An alkaline concentrate for washing facades, render and elevations of atmospheric soiling, algae and organic deposits. Diluted from 30 ml per litre for light soiling up to 400 ml per litre for heavy.
Surface
Facades and roofs
The surface the manufacturer intends this preparation for.
C-11E is the equivalent of C-11D made for facades and render. The same alkaline chemistry, a different range of dilutions - for heavy soiling it goes to 300-400 ml per litre of water, stronger than the roof version.
It targets atmospheric soiling, algae and organic deposits on render, brick and concrete. pH of the concentrate approx. 11.5, of the working solution approx. 9-10.
Working temperature 5-30 °C. The manufacturer requires a test in an inconspicuous place before washing the whole wall - on a facade the difference in shade after washing can be as visible as the soiling was.
The facade is the one category where the order of work can ruin the result whatever the product. A sealer applied over live algae seals them in.
Work out of direct sun and with a forecast free of rain. The manufacturer states how long the surface has to be protected from rain; it is under "Technical data".
Before sealing the whole area, test on a patch hidden by a planter or in a corner of the patio. The same product can read differently on two batches of the same material, and on a surface with old coating left on it, it will not bond at all.
It should not, and that is not how it works. Water-repellent products limit the ingress of water from outside while leaving the pores open to water-vapour diffusion. Manufacturers state this as diffusion resistance; we quote the figures in the technical data.
Wash it off first with a product for organic soiling, rinse thoroughly and dry the wall, then seal. Sealing without washing traps the growth under the treatment.
Yes, if the product lists roof tiles among its recommended substrates. Roof tiles are washed by hand only and on a cool surface - early or late in the day, never in full sun.
We do not claim that, and neither do the manufacturers' data sheets. A sealer acts on the water uptake of the surface, not on heat transfer through the structure.
A 1:4 dilution means one part product to four parts water - a litre of concentrate gives five litres of working solution. Where the ratio is given in ml per litre of water (the C range), work the other way: 50 ml per litre means 20 litres of solution from one litre of concentrate.
The whole wall. A washed section against an unwashed one stays visible as a lighter patch - the commonest mistake when cleaning facades in spots.
Cover them before work and rinse with water afterwards. The product at working strength has a pH of 9-10.
The technical sheet and safety data sheet will be available after approval.
This product has no stated coverage yet, so we cannot work out the requirement.
The calculator starts once the manufacturer states the coverage.
Go directly to the right category. We do not imply compatibility across materials.