Winter Waterproofing

How to Choose the Right Products and Execute Properly

Conducting waterproofing work during frosty conditions with conventional materials can be risky and ineffective. Read this article to learn how to perform waterproofing during the winter months. The key lies in selecting materials and technologies specifically designed for low-temperature applications.

In This Article, You’ll Learn:

• How to perform waterproofing in winter conditions
• How to choose waterproofing products for autumn and winter
• Which waterproofing products are suitable for temperatures below +5°C
• How to apply waterproofing products in low temperatures
• How to select materials and technologies for winter waterproofing

Waterproofing During Winter

Waterproofing the underground sections of a building in winter presents a significant challenge. Many tasks are conducted outdoors, and a considerable number of waterproofing processes, commonly referred to as "wet works," become more complicated at temperatures below +5°C. The situation becomes even more problematic as temperatures approach or drop below 0°C.

There are only a few waterproofing products available that can be reliably used under such cold conditions.

How to Perform Waterproofing Work During Winter?

There are several methods to deal with low temperatures on a construction site. One effective approach involves using mesh covers, curtains (tarps) on scaffolding, or specialized tents. The designated work area should then be heated with heaters. The heaters should be turned on approximately 24 hours before applying waterproofing layers to the prepared substrate.

How to Choose Waterproofing Products for Autumn and Winter? (Minimum Temperature +5°C)

Carefully considering weather conditions and selecting products suitable for the prevailing temperatures are key factors in effective winter waterproofing. Most waterproofing products are designed for use at temperatures above +5°C. This is because bituminous masses are typically water-based dispersions, and cementitious slurries require mixing with water or use liquid water-based components (as in flexible slurries).

Key Considerations for the Transition Period (Temperatures Above Freezing)

• Quick-Setting Products
  During transitional periods when temperatures remain above freezing, the use of quick-setting products is crucial. For polymer-bituminous materials modified with synthetic additives, two-component products (KMB masses) are highly recommended, such as:
  • BOSTIK BLOCK B525 TERRA 2K (Dickbeschichtung 2K)
  • PCI Pecimor 2K
  • Koester Deuxan 2K
  • Koester Bikuthan 2K

  Two-component bituminous products utilize both emulsions and hardeners, enabling the sealing layer to form through water evaporation and chemical reactions.

• Drying and Curing Times
  The drying or curing time provided on the packaging or technical sheet refers to normal temperatures. At lower temperatures and higher humidity, this process takes longer. Before starting work, it is advisable to store materials in a heated area to raise their temperature, especially if they have been transported or stored in cold conditions.

Cementitious and Sealing Slurries

Products such as BOSTIK C514 Terra 1K (formerly K11 Schlämme Grau), which also require quick setting, should be used with an understanding that their specified curing time applies to approximately 20°C. Lower temperatures and higher humidity slow down the curing process and strength development.

• Preparation Tips
  Quick-setting sealing slurries are often single-component products that must be mixed with water before application. Use water at a temperature of around 25°C for mixing. However, avoid using excessively warm water, as it can drastically shorten working times and negatively affect the shrinkage properties of the slurry.

Thin-Layer Plasters

Thin-layer plasters such as acrylic, silicone, or siloxane plasters can be applied at a minimum temperature of +5°C. Modifiers are available to allow application even at temperatures approaching 0°C.

How to Apply Waterproofing Products in Low Temperatures?

Substrate Preparation

During slight frosts, frost can often appear on the surface. Such a substrate, as well as surfaces covered with a thin layer of ice or dampened as the temperature crosses the freezing point, are unsuitable for applying insulation materials. To correctly carry out waterproofing with products designed for winter conditions, it is necessary to increase the substrate temperature while simultaneously ensuring it is dried properly.

Care for Waterproofing Products – Key Considerations

Proper care of waterproofing products is essential:

• Summer Considerations: In summer, it is crucial to protect applied elements from the harmful effects of UV radiation.
• Winter Considerations: In low temperatures, products must be protected against heat loss.
• Temperature Threshold: The critical temperature for application is generally +5°C. This applies not only during the application but also for the period immediately afterward. Ensuring adherence to these conditions is vital for the effectiveness and longevity of the waterproofing layer.

How to Choose Products and Technology for Waterproofing During the Autumn-Winter Period?

The selection of waterproofing materials depends on the specific case. Therefore, it is best to schedule a consultation with our technologist, who will assist you in selecting products tailored to your unique situation.