Installing screed over underfloor heating systems can be a delicate process. When done correctly, it ensures optimal heating efficiency and a durable floor. However, certain mistakes can compromise the performance of both the screed and the underfloor heating system. Avoid these common mistakes to ensure a successful installation.
Insufficient Subfloor Preparation
One of the most common mistakes is inadequate preparation of the subfloor.
Solution:
Ensure the subfloor is clean, dry, and free of debris. Any irregularities or contaminants can affect the adhesion and performance of the screed. Additionally, checking for levelness and repairing any cracks or imperfections is crucial before applying the screed.
Ignoring Moisture Levels
Excess moisture in the screed can lead to mould growth and damage to the floor covering.
Solution:
Conduct moisture tests before installing the final floor covering. Ensuring the screed is fully dried is essential to avoid problems such as mould and damage to the floor finish.
Improper Mixing of Screed
The consistency of the screed mix is key to its performance and durability.
Solution:
Follow manufacturer’s instructions when mixing screed. Consistency in the mix ensures even application and prevents weak spots that could crack or degrade over time.
Incorrect Screed Thickness
Applying the screed at an incorrect thickness can compromise its effectiveness and the efficiency of the underfloor heating system.
Solution:
Follow the recommended screed thickness for your specific project according to manufacturer’s guidance. Traditional sand and cement screeds typically require a thickness of 65-75mm, while liquid screeds can be applied at 35-45mm, however it is important to consider the unique requirements of a project. Ensuring the correct thickness promotes efficient heat transfer and structural integrity.
Rushing the Curing Process
One of the biggest mistakes is rushing the curing process, which can lead to cracks and weakened screed.
Solution:
Allow the screed to cure and dry fully according to the manufacturer’s guidelines. Rushing this process can compromise the strength and durability of the screed. Proper curing ensures long-term performance and decreases future issues.
Incorrect Heating System Commissioning
Failing to properly commission the underfloor heating system before applying the screed can lead to significant issues.
Solution:
Before installing the screed, gradually heat the system to check for leaks and ensure that it functions correctly. This process helps identify and rectify any issues early, preventing problems after the screed is applied.
Not Using Professional Installers
DIY screeding or using inexperienced installers can result in a subpar installation.
Solution:
Hire professional installers with experience in screeding and underfloor heating systems. Their expertise enables the screed to be applied correctly, optimising the performance and longevity of your heating system.
Conclusion
Avoiding these common mistakes when screeding over underfloor heating ensures a successful installation that maximises heating efficiency and floor durability. Proper subfloor preparation and moisture testing, correct mixing and application of screed, and allowing adequate curing time are all critical steps. In addition, responsible floorcovering installation and commissioning of the heating system is vital to maximising the value of screed.
By adhering to these guidelines and employing professional installers, you can avoid potential pitfalls and ensure that your underfloor heating system operates efficiently and effectively. This careful approach not only enhances the comfort and performance of your home but also improves the long-term durability and reliability of your heating solution.
