To protect your facade or your roof from humidity, we use a particular technology called «damp proofing». It consists of spraying a siloxane product which contains solvents to maximize its penetration. You can use it on roof tiles, sandstone, concrete or even stucco. As for the natural stones, some preliminary tests are necessary.
These materials which are slightly humid and absorbent give the best results and it usually takes only two layers to fully impregnate the surface. When the product is dry, the material will be waterproof and will prevent any liquid or pollution from adhering