Polyurethane resin for the terrace

What is polyurethane resin?

Polyurethane resin is a synthetic polymer characterized by high elasticity and abrasion resistance. It is used as a protective coating on various surfaces, including terraces, where it provides durability and an aesthetic finish.

Features and properties of polyurethane resin

• UV Resistance : The polyurethane coating is chalk-resistant, preventing whitening during outdoor use. Furthermore, aliphatic polyurethane does not yellow when exposed to sunlight, ensuring long-lasting aesthetics.
• Flexibility : Adapts to the natural movements of the substrate, minimizing the risk of cracking.
• Chemical resistance : It is highly resistant to chemicals, which is important in the case of exposure to various substances, such as those contained in acid rain or exhaust fumes.

Polyurethane resin and other types of coatings

Compared to epoxy resins , polyurethane resins offer better flexibility and UV resistance, making them more suitable for outdoor applications such as terraces.

Advantages of using polyurethane resin for a terrace

• Durability : High resistance to abrasion and mechanical damage.
• Aesthetics : Various finishes are available, from matte to high-gloss, depending on your preference. Selected polyurethane resins can be tinted, allowing for unique and aesthetic designs tailored to the client's vision.
• Easy to maintain : Smooth, jointless surface makes cleaning and maintenance easy.

How to prepare a terrace for the application of polyurethane resin?

1. Assess the Substrate Condition

: Ensure the surface is stable, dry, and free of cracks and loose particles. Remove any loose particles to improve adhesion and durability of the entire flooring system.

2. Cleaning

: Remove all dirt, grease, and other contaminants that may affect resin adhesion. It's recommended to use special degreasing agents such as Sulfanol A or Emulsol . However, remember that after using any cleaning or degreasing agents, they must be thoroughly washed off. Unremoved residue will affect the adhesion of the subsequent decking system.

3. Repairing Damage:

If there are any gaps or cracks, they must be filled. epoxy-based repair compounds Epoxol® Putty or Epoxol® Liquid . You can also make your own repair compound or use an epoxy screed using Epoxol® Primer SF-P . In the case of large defects, it is worth reprofiling the substrate using PCC compounds such as Troken CBL , Troken FCM1 , or Troken FCM2 . The final surface should be as smooth and uniform as possible before applying resin systems .

4. Sanding

: Sanding the substrate is always recommended to increase the resin's adhesion to the substrate. Depending on the type of system being applied, different sanding methods are recommended. For thin-layer systems applied with a roller, the substrate should be gently sanded to open the pores and increase adhesion. On the CSP scale, this is a 2 or 3. However, if thick-layer or self-leveling systems exceeding 1 millimeter in thickness are being applied, shot blasting or milling is recommended. On the CSP scale, this is a 4 or 5. This substrate preparation should ensure adequate adhesion and, therefore, the system's durability for years.

5. Priming:

When applying polyurethane resin systems on a terrace, a suitable primer is essential to ensure better resin adhesion to the substrate. Neopox® Primer WS are often used on wet concrete to protect the floor against delamination and the appearance of bubbles, and to increase adhesion.

How to Apply Polyurethane Resin to a Terrace? Step by Step

1. Preparing the Mixture:

First, thoroughly mix both resin components according to the manufacturer's instructions. Some polyurethane resins for terraces, such as Neodur® Special or Neodur® Special Mat , require the use of the Neotex® PU 0413 . This affects not only the product's flow but also the final aesthetic effect.

2. Applying the First Layer:

After preparing the mixture, the polyurethane resin is evenly spread across the terrace, applying the first layer. Depending on the product, this is done using a roller, brush, or squeegee , if the manufacturer allows this type of application, ensuring even coverage of the entire surface.

3. Drying – Initial Curing:

Allow the polyurethane resin applied to the terrace to dry according to the manufacturer's recommendations (usually 24 hours). After this time, subsequent layers of the system can be applied. It is worth remembering that the minimum drying time is always specified in the technical data sheet of the product being used and applies to specific weather conditions. If humidity is high and temperatures drop, the times given in the data sheet will likely be longer. Conversely, low humidity and high temperatures shorten these times. Therefore, it is essential to monitor weather conditions during the application of polyurethane resin on the terrace to ensure proper application of the resin system.

4. Applying Subsequent Layers:

After the floor has initially cured, a second layer of resin is applied to achieve the desired thickness and finish. If additional layers are required, they are applied according to the described procedure.

5. Final Curing:

The final step is to allow the polyurethane resin floor to fully cure on the terrace before it is fully usable. During this time, although the surface is cured, the chemical cross-linking process continues within. It is not recommended to place furniture on the terrace or wear shoes during this process. This stage typically lasts up to 7 days after the final layer is applied.