A complete guide to water-repellent treatment for porous limestone
The protective treatment of porous stone materials is essential to prevent their degradation caused, directly and indirectly, by water absorption. Natural stone surfaces, especially those exposed outdoors, require specific care and treatment to preserve their beauty and integrity over time. In this article, we will explore the importance of treating porous limestones correctly.
Overview of porous limestones and degradation phenomena
Limestones are sedimentary rocks composed almost exclusively of calcite, a mineral consisting of calcium carbonate (CaCO3). The porous types of such stones are characterised by a structure that allows high absorption of water and the substances dissolved in it (salts, pollutants, carbon dioxide, oxygen, etc.).), making them particularly vulnerable to various degradation phenomena (physical, chemical, biological and anthropogenic).
Water penetrating into stone material can have different origins: meteoric water, condensation moisture, rising damp and leaks from water systems. Lecce stone, carparo, calcareous tuff and travertine are typical examples of limestones that, due to their high porosity, require protective treatments to prevent structural damage, colour changes and the formation of surface dust.
The importance of correct protective treatment
Correct treatment of porous stones is essential to preserve their aesthetics, functionality and structure. Ineffective or inadequate treatment can lead to problems such as yellowing, the formation of surface films and induce accelerated degradation processes. These problems are often caused by the use of products that are not fully compatible with the specific media and therefore do not offer lasting protection.
In the worst cases, unsuitable products can create a non-breathable barrier that causes the outer part of the treated surface of the stone to detach (the so-called 'plug effect'). A suitable protective product must, on the other hand, create an invisible film capable of blocking the penetration of liquid water from the outside to the inside of the stone (water-repellent effect) and, at the same time, be permeable to the water vapour present inside the stone material, allowing it to escape naturally (transpiring effect).
Camp's solution: Hydro Pro Eco Tuff and Pietra Leccese
Camp has developed an innovative solution for the treatment of porous limestone with Hydro Pro Eco Tufo and Pietra Leccese, a water-repellent, surface-consolidating protective agent in aqueous solution. This product is designed to offer long-lasting, non-invasive protection, thanks to an optimised formula that penetrates deeply into the stone's micro-cavities, creating a protective barrier against water, humidity, soluble salts, smog and other pollutants.
Application of Hydro Pro ECO Tuff and Pietra Leccese on Lecce stone, one year after treatment. On the right, mould and blackening can be seen on the unprotected part.
Treatment Benefits
The benefits of using Hydro Pro Eco Tuff and Pietra Leccese are manifold. In addition to offering long-lasting protection, the product does not alter the original appearance of surfaces and leaves their breathability unaltered. It also counteracts phenomena such as capillary rise and the formation of salt efflorescence, crusts, patinas, moulds and algae. It also chemically bonds to the micro-cavities in the stone to ensure a good surface consolidating action and aggregate the dust present on the surfaces to be treated. Its environmentally friendly formula, free of Volatile Organic Compounds (VOCs), also guarantees respect for the environment.
Preparation of surfaces for treatment
>Before applying Hydro Pro Eco Tuff and Pietra Leccese, it is essential to properly prepare the surfaces. Ensure that surfaces are dry, well cured and free of water, debris, dust, oils and residues from previous treatments. Clean surfaces beforehand with AlcaDet and, if mould is present, use Rimuovi Muffa and Mould Control Risanante. Any cracks or cavities must be carefully repaired.
How to apply Hydro Pro Eco Tufo and Pietra Leccese
Hydro Pro Eco Tufo and Pietra Leccese is ready to use and does not need to be thinned. Apply the product with a brush, roller or low-pressure sprayer, spreading it evenly until it is saturated ("a rifiuto" application). Apply several coats continuously, wet on wet. On vertical surfaces, apply from bottom to top.
Precautions during treatment
The treatment, like all treatments of this type, is irreversible and must be carried out according to the instructions for use given (see the product data sheet for more information). Protect glass, window frames, plants and other non-porous surfaces. Ensure that the surface temperature is between +5 and +40 °C during application and protect from rain for at least 4 hours after treatment. Do not use on ceramics, wood, plastic, metals or non-porous materials.
Conclusioni
Understanding how to accurately treat porous limestone is essential to ensure its longevity and beauty. Camp's Hydro Pro Eco Tufo and Pietra Leccese water-repellent treatment offers an effective and long-lasting solution, preserving the integrity of natural stone materials without altering their appearance.
[product=hydro-pro-eco-tufo-e-pietra-leccese]
Water repellent impregnating solution with high penetrating power, colourless, long-lasting, anti-dust and anti-dirt, suitable for the protection of natural stone.
Specifically for the treatment of mineral substrates and highly porous surfaces. It creates a protective barrier against water, humidity, rain, frost, smog and pollutants.
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