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Using the following data, calculate the U-value of the insulated concrete ground floor: Concrete floor slab thickness 125 mm. Extruded polystyrene insulation thickness 200 mm. Damp proof membrane (DPM) thickness 0.30 mm. Sand blinding thickness 30 mm. Hardcore thickness 225 mm. Thermal data of floor: Resistance of top surface of floor (R) 0.104 ...
Full details about calculating the U-value of a window or door are given in BS EN ISO 10077-1. This Part provides indicative U-values for windows, rooflights and doors. Table 6.A.1 applies to windows (and rooflights) with wood or plastic frames.
U-value results above based upon floor construction shown: Radon barrier / DPM; Mannok Therm Floor / MF; 150mm concrete; timber flooring (floor finish omitted); 150mm depth of Mannok Therm Floor / MF vertical edge insulation.
It says the thermal conductivity is 1.17W/mK (eg not W/m^2k). Thermal Conductivity is the U value for a notional 1m thick wall. So 100mm thick wall would have a u-value 10 times worse at 11.7W/m^2k. That's consistent with the R-value quoted for 100mm blocks of 0.09m^2k/W.... U=1/R = 1/0.09 = 11.1W/m^2k.
The table below shows the recommended U-values (thermal performance) for basement walls and floors depending on where the project is and whether you are extending or building entirely from scratch.
unilininsulation.co.uk Downloadimprove the U-Value of new and existing floors. It is lightweight, easy to install and combines high compressive strength with low thermal conductivity, providing a high performance solution for floor insulation. Benefits • High compressive strength • Suitable for underfloor heating • Perimeter strips for robust detailing
The sub-floor is prepared using well-compacted hardcore and a layer of sand blinding. If the insulation is going below the slab, the damp proof membrane (DPM) is laid next, followed by the insulation, a polythene separating layer, and the concrete slab.
kore-system.com DownloadAll U-value calculations are in accordance with BS EN ISO 6946:2007. Ground floor U-value calculations are different from wall and roof calculations in that reference to the con-struction detail alone is not suficient to calculate the U-val-ue.
To achieve minimum U Value of 0.18 W/m²K 20mm two coat sand/cement render to comply to BS EN 13914-1 with waterproof additive on 100mm lightweight block, 0.15 W/m²K, e.g. Celcon solar, Toplite Standard. Fully fill the cavity with 150mm Dritherm 32 cavity insulation as manufacturer's spec.
uvalueinsulations.co.uk DownloadXO/UF will significantly improve the U-Value of new and existing floors. XO/UF is lightweight, easy to install and combines high compressive strength with low