P574 SAP Ground Floor

U-value calculation results are provided for a ground floor using the Stroma U-value Calculator (version 0.92) and the BS EN ISO 6946 and BS EN ISO 13370 methods. The floor build-up includes internal surface resistance, a 75 mm screed, 150 mm Celotex XR4000 insulation, a 100 mm high-density concrete block layer (with a bridging element fraction of 0.2222), and underfloor resistance. The total construction thickness is 325 mm with an average thermal resistance of about 7.4 m²K/W. Site inputs include a perimeter of 20.56 m, area of 50.66 m², default ground conductivity of 2 W/mK, and an underfloor space average temperature of 7.45°C. A vertical edge insulation correction of -0.016 is applied. The final U-value is 0.12 W/m²K (rounded).