Balconies, like terraces, are constantly exposed to rain, snow, temperature variations, and UV rays. Without adequate protection, water can seep into cracks in the flooring or joints between the slab and the wall, causing:

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• Detachment of tiles or coating
• Concrete deterioration and crack formation
• Appearance of damp patches and mold on underlying ceilings
• Risk of seepage into interior walls

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To avoid these issues, it is necessary to apply a suitable waterproofing system, choosing from the most innovative and effective solutions available on the market.

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1. Waterproofing with Crystalline Admixtures for Concrete

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For newly constructed balconies, an effective solution is the use of crystallizing additives such as Drymix and Drymix Ultra, which are added directly to the concrete mix. These products react with water, forming insoluble crystals that seal pores and micro-cracks, preventing moisture from passing through.

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Advantages:

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• Permanent protection integrated into the concrete
• Self-sealing capacity of micro-cracks
• Improved resistance to chemical and atmospheric agents

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2. Liquid or Cementitious Waterproofing Membranes

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For existing balconies, liquid or cementitious waterproofing membranes can be applied, creating a continuous and flexible barrier that prevents water absorption.

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Types of membranes:

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• Polyurethane membranes: highly elastic, UV resistant, and perfect for balconies exposed to the sun
• Acrylic membranes: ideal for walkable surfaces, easy to apply, and available in various finishes
• Two-component cementitious membranes: excellent adhesion to concrete substrates, also suitable for surfaces subject to negative hydrostatic pressure

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These solutions can be applied directly under the existing flooring or before laying new tiles.

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3. Bituminous Membranes

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Bituminous membranes are a traditional solution for waterproofing balconies, guaranteeing effective and lasting protection. They are applied hot or cold and then covered with a protective layer or with the flooring.

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Advantages:

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• High resistance to water and temperature fluctuations
• Suitable for large surfaces
• Good durability over time

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If you do not want to dismantle the existing flooring, you can apply a transparent, water-repellent silane- or siloxane-based sealant. This treatment creates an invisible surface protection that prevents water from penetrating joints and micro-cracks, without altering the appearance of the floor.

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Which Solution to Choose?

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The choice of waterproofing system depends on several factors:

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• Type of balcony (new construction or existing)
• Presence of flooring to be maintained or replaced
• Climatic conditions and degree of exposure to atmospheric agents
• Durability and required maintenance

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To ensure effective and lasting results, it is advisable to rely on high-quality materials such as those offered by Drykos, which provides advanced solutions for waterproofing concrete structures.

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Balcony waterproofing is an essential measure to prevent damage from water infiltration and ensure the durability of the structure. Whether it is a new or existing balcony, effective solutions are available, such as crystalline additives, liquid membranes, and bituminous membranes. Choosing the right method protects the building, avoids costly repairs, and improves living comfort.