Floor Insulation

Excavate existing concrete floor & reconstruct

To maintain a higher ceiling height while achieving the required U-value of 0.18 for the floor insulation in your conversion project, consider the following alternative options: 1. **Alternative Insulation Materials:** Look for high-performance insulation materials with better thermal efficiency and lower thickness. Some materials may provide a similar U-value with less thickness, allowing you to preserve more ceiling height. 2. **Underfloor Heating:** Consider installing underfloor heating as it can serve both as a heating system and an insulation layer. This eliminates the need for a thicker insulation material, creating more room for ceiling height. 3. **Thinner Floor Finish:** Choose floor finishes that have a lower profile while still meeting your design preferences and functional requirements. For instance, engineered wood or thinner tiles can reduce the overall floor thickness. 4. **Suspended Timber Floor:** If suitable for your building, explore the possibility of converting the concrete floor to a suspended timber floor. This type of floor can accommodate insulation between joist spaces, optimizing the floor-to-ceiling height. 5. **Hybrid Approaches:** Combining several strategies, such as using alternative insulation materials, underfloor heating, and thinner floor finishes, can collectively contribute to achieving the desired U-value without compromising the ceiling height significantly. To ensure the proposed modifications comply with building regulations, safety standards, and energy efficiency guidelines, seek advice from qualified professionals like architects, structural engineers, or energy assessors. They can provide specific recommendations tailored to your project, considering its unique characteristics and limitations.

Use a higher-performing insulation material. There are a number of insulation materials on the market that have a lower thermal conductivity than Kingspan Thermafloor TF70. This means that you can use a thinner layer of insulation to achieve the same U-value. For example, you could use Xtratherm XO/UF, which has a thermal conductivity of 0.021 W/mK. This would allow you to use a layer of insulation that is just 50mm thick, which would only reduce your ceiling height by 100mm.

As already excavate & rebuild. You'll need 100mm of PIR board for 0.18, variation in thermal conductivity at 0.21, 0.22, 0.23 won't have any real impact on what you need other than expense.