Thermal Performance: Part L1A - Masonryfirst.com

Thermal Performance: Part L1AFigure 12 continuedBeam and aircrete block(screed on insulation)Beam and lightweightaggregate block(screed on insulation)In-situ concrete(screed on concrete)Beam and polystyrene block(concrete topping)Ground Floors• End terrace house withperimeter/area ratio ofaround 0.75• End terrace house withperimeter/area ratio ofaround 0.75• End terrace house withperimeter/area ratio ofaround 0.75• End terrace house withperimeter/area ratio ofaround 0.75• Expanded polystyreneinsulation• Expanded polystyreneinsulation• 150mm edge insulation• Expanded polystyreneinsulation• Extruded polystyrene blocksU-values (W/m 2 K) U-values (W/m 2 K) U-values (W/m 2 K) U-values (W/m 2 K)0.18 295 mm floor /130 mm insulation0.18 295 mm floor /130 mm insulation0.18 395 mm floor /130 mm insulation0.18 290 mm floor / 215mm block depth.Actual U-value isslightly better than0.18 W/m 2 K)Insulation0.14 345 mm floor /180 mm insulation0.14 345 mm floor /180 mm insulation0.14 445 mm floor /180 mm insulation0.14 350 mm floor / 215mm block depth.Includes additional40mm layer ofinsulation.0.12 395 mm floor /230 mm insulation0.12 395 mm floor /230 mm insulation0.12 485 mm floor /220 mm insulation0.12 390 mm floor / 215mm block depth.Includes additional80mm layer ofinsulation.k-values (kJ/m 2 K) k-values (kJ/m 2 K) k-values (kJ/m 2 K) k-values (kJ/m 2 K)Thermal Mass78 (65mm screed)108 (90 mm screed)78 (65mm screed)108 (90 mm screed)159 (65 mm screed) 179 (75mm concretetopping, no screed)Other thermal mass properties Other thermal mass properties Other thermal mass properties Other thermal mass propertiesAdmittance (W/m 2 K) 3.5 Admittance (W/m 2 K) 3.5 Admittance (W/m 2 K) 3.3 Admittance (W/m 2 K) 4.9Values contained in Figure 12 are intended for guidance purposes only.19