Makes clay and concrete roof tiles more resistant to soiling and reduces the risk of efflorescence. The water-based water-repellent sealer penetrates the material instead of forming a film, so the roof keeps its vapour permeability.
Facades and roofsVD-1 is a sealer for clay and concrete roof tiles. It increases the covering's resistance to soiling and reduces the risk of efflorescence.
On a roof, what matters most in a sealer is vapour permeability. VD-1 has a water-vapour diffusion resistance Sd = 0.0 m, so the sealed covering offers no resistance to water vapour.
The product forms no film and does not change the appearance of the tile. Apply it to saturation in one heavier, evenly spread coat.
On a facade the order of work matters as much as the product itself: a sealer applied over live algae seals them in.
Work out of direct sun and with a forecast free of rain. How long the fresh coat has to be protected from rain is given in the product's technical data.
Before treating the whole wall, test on an inconspicuous patch, behind a downpipe for instance. 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.
No. Water-repellent products limit the ingress of water from outside but leave the pores open to water-vapour diffusion, so the wall can still release moisture.
Wash it off first with a product for organic soiling, rinse thoroughly and let the wall dry, then seal. Sealing without washing traps the growth under the treatment.
Yes - choose a product with roof tiles on its list of recommended substrates. Before sealing, wash them while the surface is cool - early or late in the day, never in full sun - and let them dry.
No - that is not a sealer's job. It acts on the water uptake of the surface, not on heat transfer through the structure.
As much as the surface will take - the product is applied to saturation - so consumption depends entirely on how absorbent the material is. The simplest method: seal one square metre, measure what it took and multiply by your area, adding a margin.
After 5-6 hours. Until then, keep the freshly sealed surface out of the rain and direct sun.
Wash the covering with C-11D cleaner, then rinse it and let it dry. Wash them on a cool surface, ideally in the morning or evening - by hand or with a pressure washer.
Apply to full saturation in one generous coat; on absorbent material, repeat the application wet-on-wet.
Write to us with the area and the type of surface - we will help you work out how much you need.
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A sealer will not bond to a dirty surface. Start by cleaning it thoroughly.
