Balcony waterproofing: effective techniques to prevent seepage

Balcony waterproofing is an essential intervention to prevent structural damage caused by water and moisture. A balcony exposed to the elements without proper protection can develop cracks, coating detachment, and seepage that compromise the stability of the building and the quality of the rooms below. Let's see what are the best solutions for effectively and durably waterproofing a balcony.

Why Waterproof a Balcony?

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

  • Detachment of tiles or wall tile
  • Concrete deterioration and crack formation
  • Occurrence of moisture stains and mold on the ceilings below
  • Risks of seepage into interior walls

To avoid these problems, a suitable waterproofing system must be applied, choosing from the most innovative and effective solutions available on the market.

Solutions for Balcony Waterproofing

1. Waterproofing with Crystallizing Additives for Concrete.

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

Advantages:

  • Permanent and integrated protection in concrete
  • Ability to self-seal microcracks
  • Improved chemical and weather resistance

2. Liquid or Cementitious Waterproofing Membranes.

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

Types of membranes:

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

These solutions can be applied directly under the existing floor or before new tiles are laid.

3. Bituminous Sheaths

Bituminous membranes are a traditional solution for waterproofing balconies, providing effective and long-lasting protection. They are applied hot or cold and then covered with a protective layer or paving.

Advantages:

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

How to Waterproof a Balcony Without Removing the Floor?

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

Which Solution to Choose?

The choice of waterproofing system depends on several factors:

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

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

DRYBOXSYSTEM® for concrete waterproofing.

Balcony waterproofing is an essential intervention to prevent damage from seepage and ensure the durability of the structure. Whether the balcony is new or existing, there are effective solutions such as crystallizing additives, liquid membranes, and bituminous sheathing. Choosing the right method can protect the building, avoid costly repairs, and improve living comfort.

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