Underfloor Heating: How to Install It Safely
Underfloor heating is one of the most modern and comfortable solutions for home heating. It offers uniform heat distribution, energy savings, and freedom in furniture layout. However, for it to function properly and last over time, careful selection and application of surface materials are essential.
The Particularities of Underfloor Heating
The main challenge with underfloor heating systems is thermal variation. The floor constantly expands and contracts due to heating and cooling cycles. Therefore, materials with high elasticity and resistance to thermal fatigue are required.
In addition, proper waterproofing is critical to prevent moisture penetration, which can damage both the heating system and the structural materials.
Substrate Preparation
The substrate must be perfectly clean, stable, and level. Before finishing work, waterproofing is necessary—especially in areas like bathrooms or kitchens.
Kraft Paints’ Hydroguard series is an ideal solution, creating a waterproof barrier that protects the heating system from leaks or moisture accumulation.
Choosing the Right Tile Adhesive
Tiles placed over underfloor heating must be bonded with tile adhesive that can withstand frequent temperature fluctuations. FixoTile Flex 30 is specially designed for such applications, offering flexibility and excellent adhesion.
Similarly, the GEL technology of FixoTile GEL and FixoTile GEL MAX provides additional stability and stress absorption, preventing future detachment or cracking.
The correct technique involves applying tile adhesive both on the substrate and on the back of the tile ("double spreading") to avoid air pockets.
Grouting and Finishing
Choosing the right grout is just as important in underfloor heating systems. The grout must be flexible to absorb the movements caused by temperature changes.
Kraft Paints’ FixoGrout One offers excellent resistance to expansion and contraction, high water repellency, and long durability. It also comes in a wide range of colors to suit any architectural style.
Critical Areas and Sealing
Special care is required at floor-to-wall joints, pipe penetrations, and expansion joints. In these areas, specialized high-elasticity sealants from Kraft Paints are used to maintain waterproofing and flexibility, even under extreme temperature changes.
Proper sealing prevents cracks and extends the durability of both the finish and the heating system itself.
Application Tips
Before starting the heating system, allow sufficient time (at least 28 days) for all tile adhesives and grouts to fully cure.
Gradually the temperature increases, raising it by a few degrees each day, to avoid stressing the floor.
Only use certified and specially designed products for underfloor heating installations.
Conclusion
Proper installation of finishes over underfloor heating requires experience and the right materials. With top-quality products such as the Hydroguard line, FixoTile Flex 30, FixoTile GEL, FixoTile GEL MAX tile adhesives, FixoGrout One grout, and Kraft Paints’ specialized sealants, you ensure a flawless, durable, and comfortable result that will provide warmth and comfort for years.
Underfloor heating is not just a technical solution—it is an investment in quality of life.