Types of Floor Insulation for Underfloor Heating

Floor insulation for underfloor heating is essential for maintaining the efficiency of heating systems. By selecting the right type of insulation, you can ensure comfort and prevent heat loss. Insulation helps retain heat within the room by reducing heat transfer to the ground or the space below.

There are various types of floor insulation for underfloor heating, each differing in its resistance to moisture, compatibility with different heating systems, and thermal conductivity. Many people choose floor insulation after consulting with a professional installer, who will consider the type of floor, the heating system, and the desired efficiency level based on the client’s preferences.

Polystyrene in Floor Insulation for Underfloor Heating

Polystyrene is a popular material of floor insulation for underfloor heating systems due to its lightweight nature and cost-effectiveness. It offers good thermal insulation, and professional installers often use it in electric underfloor heating systems. Polystyrene insulation typically comes in two common forms: expanded (EPS) and extruded (XPS).

Expanded Polystyrene (EPS)

The lightweight and easy-to-install nature of EPS makes it a preferred choice for many. It is also more affordable better than other types of insulation. While its thermal insulation properties are fairly good, EPS can enhance the efficiency of an underfloor heating system in your home.

However, despite its advantages, EPS has some drawbacks. It is less durable and has lower moisture resistance compare to XPS. EPS is not ideal for heavy-duty applications, particularly in areas with high humidity or under concrete floors that are prone to moisture.

Extruded Polystyrene (XPS)

XPS is best for its resistance to mechanical damage, as well as its higher moisture resistance compare to EPS. With better mechanical strength and more efficient thermal insulation, XPS is a more expensive option. However, if the installer makes a mistake during installation, XPS is more susceptible to damage from sharp objects. XPS is typically recommendation for areas under concrete or places with heavy loads.

Polyurethane in Floor Insulation for Underfloor Heating

For concrete floors, stronger thermal insulation like polyurethane boards is ideal. Polyurethane offers high thermal insulation values and excellent energy efficiency, though it comes at a higher price. The numerous advantages of polyurethane insulation make it a worthwhile investment:

Thermal Performance

Polyurethane is highly efficient due to its low lambda value, which reduces heat loss through the floor. With proper insulation, the efficiency of the heating system improves as it retains heat effectively.

Durability

High-traffic areas such as kitchens and living rooms benefit from the strength and durability of polyurethane. It is also ideal for underfloor heating applications in areas with heavy loads. Polyurethane is particularly useful in rooms like bathrooms, kitchens, basements, and janitor areas where humidity levels are high. In addition to being moisture-resistant, polyurethane is not easily damaged by continuous exposure to water.

Mineral Wool in Floor Insulation for Underfloor Heating

Mineral wool is an excellent choice for floor insulation for underfloor heating systems, particularly for its soundproofing qualities. It is also fire-resistant, though not as effective as polystyrene or polyurethane in retaining heat.

Although mineral wool may be less resistant to moisture than polystyrene, it offers several advantages for underfloor heating applications.

Good Thermal Insulation

Mineral wool, a natural material, provides effective heat protection for underfloor heating while helping to reduce energy loss. Its thermal insulation properties are good, though not as high as those of polyurethane or polystyrene in terms of thermal conductivity. However, mineral wool remains a suitable option if you’re looking for an environmentally friendly material for energy efficiency.

Fire and Noise Resistance

Mineral wool is highly resistant to fire and heat, making it a safe choice for underfloor insulation. Its non-flammable nature increases the safety of your home or building.

In addition, mineral wool is an excellent sound absorber, making it a great option for reducing noise. This feature is particularly beneficial in multi-story buildings or areas with high foot traffic, where soundproofing under the floor is important.

Moisture Resistance

While mineral wool is not completely waterproof, many types offer good moisture resistance. This makes it a suitable choice for areas with high humidity, such as bathrooms or basements. To ensure optimal performance, it’s important that the installer do the installation correctly to prevent moisture from affecting the insulation’s efficiency.

Cement Insulation Board in Floor Insulation for Underfloor Heating

Cement boards are a reliable choice for underfloor heating, especially in heavy-duty applications. While their thermal insulation is effective, they are less flexible compare to other types of insulation. However, the strength and durability of cement insulation boards make them ideal for commercial applications or high-traffic areas.

Resistance to High Temperatures and Fire

Cement is highly resistant to high temperatures, making it an excellent material for hydronic underfloor heating systems or the electric one, that produce intense heat. The cement layer helps retain and evenly distribute heat, ensuring the heating system operates efficiently.

Resistance to Moisture

Cement insulation boards do not absorb water, making them highly resistant to moisture. They are well-suited for high-moisture areas such as bathrooms, basements, or kitchens. Cement boards are also strong and stable enough to support heavier loads compared to many other insulation materials, making them an excellent choice for areas with high mobility or frequent traffic.

Increased Energy Efficiency

Cement insulation boards help improve energy efficiency by reducing heat loss downward, allowing more heat to be reflect back into the room. This contributes to a more efficient floor insulation for underfloor heating system.

Additionally, cement’s resistance to water absorption reduces the risk of condensation, which can negatively affect the heating system and the structural integrity of the building. Lower humidity levels can help extend the lifespan of the heating system and enhance the durability of the building structure.