Best Concrete Flooring for Underfloor Heating: Comparison & Cost Chart

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Concrete Flooring & Underfloor Heating Compatibility

Flooring Type Thermal Conductivity (W/m·K) Heat Retention Installation Cost (£ per m²) Best Heating Type Thickness Requirement
Polished Concrete 1.4 - 2.0 W/m·K Excellent heat retention £80 - £150 per m² Water-Based & Electric 75mm - 100mm depth
Microcement 0.8 - 1.2 W/m·K Good heat retention £60 - £120 per m² Water-Based & Electric 2mm - 5mm depth
Concrete Screed 1.1 - 1.5 W/m·K Very Good heat retention £40 - £90 per m² Water-Based 50mm - 75mm depth
Resin-Coated Concrete 1.2 - 1.6 W/m·K Very Good heat retention £100 - £180 per m² Electric 3mm - 8mm depth
Standard Concrete (Unpolished) 1.3 - 1.7 W/m·K Good heat retention £30 - £70 per m² Water-Based 100mm+ depth

Frequently Asked Questions

🔹 What’s the best concrete floor for underfloor heating?
Polished concrete and screed are the most efficient choices for underfloor heating. They have high thermal conductivity, allowing heat to spread evenly across the surface, making them ideal for energy efficiency.
🔹 Does polished concrete work well with underfloor heating?
Yes, polished concrete retains heat well and distributes warmth efficiently. It works best with water-based systems, as electric heating may require additional insulation to avoid heat loss.
🔹 How thick should concrete be over underfloor heating?
For optimal performance, a polished concrete slab should be 75mm to 100mm thick, while a screed layer over heating pipes is typically 50mm to 75mm. Thicker slabs take longer to heat but retain warmth for extended periods.
🔹 Is microcement a good option for underfloor heating?
Microcement is a thin-layer option that works well with underfloor heating. However, it doesn’t store heat as effectively as thicker materials like polished concrete or screed. It’s best suited for quick heat-up times rather than long-term heat retention.
🔹 Which is better: electric or water-based underfloor heating for concrete floors?
Water-based underfloor heating is typically the better choice for concrete floors. It distributes heat more evenly and is more cost-effective for larger areas. Electric systems heat up faster but may lead to heat loss if the slab is too thick or uninsulated.
🔹 Does underfloor heating affect the durability of concrete flooring?
No, properly installed underfloor heating does not weaken concrete. Using expansion joints and controlling moisture levels during installation prevents cracking and ensures long-term durability.
🔹 Do I need insulation under concrete flooring with underfloor heating?
Yes, insulation is essential to prevent heat from escaping downward. A good insulation layer beneath the slab ensures more heat is directed upward into the space, improving efficiency and reducing energy costs.
🔹 Does polished concrete crack with underfloor heating?
Properly installed polished concrete should not crack due to underfloor heating. Expansion joints and gradual heat-up processes help prevent thermal stress that can lead to cracking.

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