Horizontal Foundation Waterproofing

Horizontal foundation waterproofing, alongside vertical waterproofing, is one of the most crucial elements in construction. Its primary role is to protect foundation walls from the harmful effects of water and moisture. Proper horizontal waterproofing is essential for ensuring long-term protection against the negative impact of moisture, including corrosion, mold, and the weakening of building materials. Ensuring adequate protection against moisture at the groundwater level extends the lifespan of the building and preserves its structural integrity.

Which Materials Should Be Used for Horizontal and Vertical Waterproofing?

Since horizontal and vertical waterproofing serve different purposes, they often require different materials. It is always advisable to consult construction waterproofing specialists to choose the most suitable materials for specific site conditions and project requirements.

The most commonly used materials include:

Bituminous Waterproofing

Bituminous waterproofing materials are a mixture of aggregates, asphalt, and fillers, commonly available in water-dilutable or solvent-based versions. These materials have a high diffusion resistance, making it essential that the substrate (such as concrete, plaster, or masonry) is dry or at most slightly damp before application.

Application Process:

• Before applying bituminous waterproofing, the substrate must be primed to ensure better adhesion.
• The primer penetrates the surface shallowly, preparing it for the application of dense, elastic coatings that can fill cracks and bridge small gaps.
• These materials bond well only with other bituminous materials.

Limitations:

• Bituminous waterproofing degrades under UV exposure, requiring protection from sunlight.
• Final waterproofing layers must be shielded from mechanical damage using dimpled membranes, geotextile fleece, or polystyrene boards.

Mineral Waterproofing

Mineral-based waterproofing materials are pre-mixed compounds that, once set, provide waterproof protection in two forms:

• Rigid (one-component) – mixed with water.
• Flexible (two-component) – a combination of dry mix and a polymer dispersion.

These materials adhere well to substrates such as concrete, plaster, screeds, and brick masonry.

Application Process:

• The substrate must be leveled, clean, rough, and capable of absorbing water.
• No priming is required, but moistening the surface before application is recommended.
• In summer or when additional substrate reinforcement and hydrophobicity are needed, priming may be advisable.
• Applied in thin layers (usually 2-3 coats by painting or spraying).
• Bonds effectively with other mineral materials.
• Can be covered with plaster, screed, or ceramic tiles for additional protection.

Key Advantages:

• Vapor-permeable – suitable even for highly damp surfaces.
• UV-resistant – can be exposed to sunlight.
• Rigid waterproofing is used to protect against soil moisture in masonry and concrete.
• Flexible waterproofing provides higher water resistance and adapts to minor substrate deformations.

Find Foundation Waterproofing Products Here.