Gardens and patios are increasingly being designed with the most exclusive materials. Steps taken before installation can help ensure that this outdoor investment remains in good condition over the long term.

High-quality and exclusive materials are increasingly being used in gardens and patios to create a unique atmosphere. Natural stone is often the material of choice, as it is highly sought after for facades, patios, and staircases.

If you want to enjoy the material for a long time, you should find out about cleaning options and protective treatments as early as the material selection stage. Natural stone is permeated by capillaries and pores. This system of cavities allows for the transport of foreign substances from the subsoil, the surface, or dissolved substances inherent to the stone itself. This also applies to granite and gneiss, which give the impression of being robust. The diversity of natural stone is evident not only in its appearance and texture but also in its widely varying capillary absorbency, which determines its susceptibility to staining.

When used as an extension of living space—such as on a heavily used patio—the demands on cleanability increase. Anyone who wants to preserve the value of natural stone over the long term should treat outdoor surfaces with a sealant. This helps prevent staining by reducing the deep penetration of contaminants. Contaminants are kept on the surface, where they are easier to remove.

Due to the highly variable weather conditions during the summer months, we recommend water-based impregnations such as Lithofin FLECKSTOP >W< and Lithofin Grundschutz >W<. This product group is less sensitive to residual moisture than, for example, solvent-based products.

When installed without bonding in crushed stone, sand, or gravel, water usually penetrates beneath the paving through open or permeable joints. Insufficient drainage capacity of the subbase or inadequate slope causes moisture to remain trapped beneath the slabs.

Capillary action draws moisture to the surface, where it appears as dark stains. To prevent moisture problems with loose-laid installations, it has proven effective to treat the slabs all around with the recommended impregnation, such as Lithofin FLECKSTOP >W< or Lithofin Grundschutz >W<. This measure reduces capillary absorption and the risk of stains caused by rising damp.

Find out how to care for natural stone—especially in outdoor areas—and protect it from damage in our webinar on September 29, 2020. Topic: “Preserving the Value of Natural Stone in Outdoor Areas.” Register here.