Waterproofing is one of the most critical applications that directly affects the lifespan of a building. However, even in such an essential application, frequently made mistakes can lead to long-term structural problems and significant costs. From terraces to bathrooms, from foundations to roofs, controlling water requires not only quality materials but also the correct technical knowledge and proper application. So, what are the common waterproofing mistakes? Where do most people go wrong? Which material is suitable for which area? In this guide, we examine the 12 most common application errors and the key points to ensure correct waterproofing in detail.
Materials That Should NOT Be Used in Waterproofing
Many people searching for answers to the question “how to do waterproofing?” often make their first mistake in product selection. Low-quality or unsuitable products chosen solely because they are inexpensive cause the waterproofing layer to fail quickly.
Especially in outdoor areas such as balconies, terraces, and roofs—exposed to UV rays and temperature changes—paint-based temporary solutions or solvent-based materials do not provide proper protection. At this point, DryFiX SB PLUS offers a UV-resistant, walkable coating designed for long-lasting outdoor performance. Its flexible structure also resists substrate movements.
Additionally, using non-elastic waterproofing materials is another very common mistake. However, in regions with high temperature differences, elastomeric products are required to prevent cracking. DryFiX MS POLYMER 100 is a flexible waterproofing material specifically formulated for harsh weather conditions.
Incorrect product selection increases application costs and reduces the durability of the system. Therefore, waterproofing product recommendations must be chosen according to the physical conditions and intended use of the area.
Risks of Cost-Focused Decisions
When reviewing waterproofing application guidelines, one of the most frequent mistakes is choosing low-quality materials to reduce costs. However, waterproofing is not maintenance — it is an investment. When done incorrectly, it must be repeated, multiplying the total cost.
For example, low-cost coatings applied on terraces without proper surface preparation often start leaking within a few months. At this point, DryFiX IZOLATOR offers a solution thanks to its elastic liquid membrane structure that can be used without primer and compensates for surface preparation deficiencies.
Trying to reduce investment costs affects not only the material but also the workmanship. Mistakes made by unskilled workers can make even the best product ineffective.
Ignoring Regional Climate Differences
In a country like Türkiye, where four seasons occur simultaneously in different regions, waterproofing applications that ignore climate conditions pose significant risks. While some regions reach 40°C in summer, others fall to -10°C on the same day. This variety tests the physical and chemical durability of materials.
Especially in foundation waterproofing, freeze–thaw cycles can create micro-cracks on concrete surfaces. Over time, these cracks allow water to penetrate. In such cases, DryFiX Crystal-X penetrates the concrete using crystallization technology, blocking water molecules and providing permanent waterproofing.
Similarly, using products unsuitable for harsh eastern climates shortens the lifespan of the waterproofing and requires frequent maintenance. Waterproofing mistakes result not only from materials but also from inadequate pre-application analysis.
Installer Errors: Small Oversights, Big Costs
Correct waterproofing requires both high-quality materials and skilled applicators. Unfortunately, many projects fail due to application errors, making the entire system ineffective.
The most common installer errors include:
- Insufficient cleaning of the surface
- Skipping the primer application
- Not allowing enough drying time between layers
- Failing to seal expansion joints
These oversights can lead to blistering, leaks, and structural deterioration. Especially when expansion joints are not properly treated, moving areas begin to crack over time. At this point, DryFiX Dilatation Band safely isolates expansion joints with its elastic structure and adapts to building movements.
Another common mistake in joint areas is choosing incompatible materials. Traditional joint fillers absorb water over time. However, DryFiX Water-Swelling Band expands upon contact with water, preventing leaks. This system significantly improves durability, especially in foundation retaining wall applications.
Compliance with Technical Standards: Why Are EN Certifications Important?
For waterproofing applications to be long-lasting and safe, they must comply with technical standards, not just look correct visually. Standards such as EN 1504-2, EN 14891, and EN 15814—applied in both the EU and Türkiye—define under which conditions materials maintain their performance.
These standards specify critical parameters such as:
- Chemical resistance
- Waterproofing capacity
- Elasticity and UV resistance
- Temperature tolerance
DryFiX products are developed and certified in accordance with these standards, making them safe for both residential and commercial projects.
For example, DryFiX BITUMER 100 2K is a double-component system developed to prevent common surface deterioration in wet areas and complies with the EN 14891 standard. It provides long-term protection under surfaces in bathrooms, kitchens, and WCs.
Neglecting Detail Areas: Small Spaces, Big Problems
Another frequently overlooked issue in waterproofing projects is small or hidden areas. Floor drain edges, skirting board junctions, window sills, and balcony door thresholds are often left untreated. However, water always finds the smallest gap and causes damage.
When seeking solutions without breaking the existing coating, transparent, surface-friendly products become essential. DryFiX GLASSY 100 is specially formulated for such needs. Its transparent structure preserves aesthetics and can be applied directly over ceramic or stone surfaces.
Additionally, using non-walkable products in balconies and terraces is another common error. In such outdoor areas, DryFiX SB PLUS provides waterproofing along with wear resistance thanks to its UV durability and physical strength.
Waterproofing Application Guide: Step-by-Step Correct Methods
The answer to the question “How is waterproofing done?” varies depending on the surface type, climate, and application area. However, professionally carried out waterproofing generally consists of the following steps:
Surface Preparation: The surface must be clean, dry, and dust-free. Old coatings should be removed if necessary.
Primer Application: Selecting the right primer is essential for adhesion. Incorrect primer choice is among the most common waterproofing mistakes. At this point, DryFiX IZOLATOR helps compensate for primer deficiencies.
Product Selection: Materials must be chosen according to environmental and physical conditions. For outdoor use, elastic products like DryFiX MS POLYMER 100 prevent cracking caused by temperature variations.
Layer Compatibility: Waterproofing systems are usually multi-layered. Adequate drying time must be allowed between layers. Patience ensures long-term performance.
Detail Treatment: Joints, drains, and connection points must be protected with special products. Here, DryFiX Crystal-X penetrates the concrete and crystallizes, preventing invisible leaks.
Each of these steps is critical for a successful waterproofing system. Any skipped detail may result in costly problems in the future.
Frequently Asked Questions (FAQ)
Why is waterproofing important? Because it ensures structural durability, energy efficiency, and healthy living spaces. Dry environments create long-lasting buildings.
Are waterproofing mistakes irreversible? If detected early, mistakes can be corrected. However, reapplying over faulty applications can be costly and challenging.
Can waterproofing be applied without damaging the surface? Yes. With products like DryFiX GLASSY 100, transparent waterproofing can be done without removing the existing coating.
What should be considered after waterproofing? The product must fully cure. The surface should not be exposed to water for 24–48 hours, and drying times must be respected.