Thermal Performance: Part L1A - Masonryfirst.com

Thermal Performance: Part L1AThermal properties of walls and floorsFigure 12 provides thermal performance information for a range of wall and floor constructions. U-valuesand thermal mass-related information is also included [18]. For a brief overview of all the thermal propertiesinformation in Figure 12, see page 21.Figure 12: Thermal properties for a range of walls, floors and partitions.Partial fill, brick and aircrete blockPartial fill, brick andlightweight aggregate blockPartial fill, aircrete block (both leafs)External WallsPhenolic insulation Phenolic insulation Phenolic insulationU-values (W/m 2 K) U-values (W/m 2 K) U-values (W/m 2 K)0.28 303 mm wall / 50 mm insulation 0.28 308 mm wall / 55 mm insulation 0.28 298 mm wall / 40 mm insulationInsulation0.25 308 mm wall / 55 mm insulation 0.25 318 mm wall / 65 mm insulation 0.25 303 mm wall / 45 mm insulation0.20 328 mm wall / 75 mm insulation 0.20 338 mm wall / 85 mm insulation 0.20 328 mm wall / 70 mm insulation0.18 343 mm wall / 90 mm insulation 0.18 348 mm wall / 95 mm insulation 0.18 338 mm wall / 80 mm insulation0.15 368 mm wall / 115 mm insulation 0.15 373 mm wall / 120 mm insulation 0.15 358 mm wall / 100 mm insulationk-values (kJ/m 2 K) k-values (kJ/m 2 K) k-values (kJ/m 2 K)Wet plaster finish 65 Wet plaster finish 141 Wet plaster finish 65Plasterboard finish 52 Plasterboard finish 114 Plasterboard finish 52Thermal massOther thermal mass properties(wet plaster finish assumed)Other thermal mass properties(wet plaster finish assumed)Other thermal mass properties(wet plaster finish assumed)Admittance (W/m 2 K) 2.5 Admittance (W/m 2 K) 4.1 Admittance (W/m 2 K) 2.5Decrement values whenU-value is 0.2810 hours Decrement values whenU-value is 0.2810.3 hours Decrement values whenU-value is 0.2810.2 hoursFactor = 0.34 Factor = 0.25 Factor = 0.34Decrement values whenU-value is 0.1511.3 hours Decrement values when 11.6 hours Decrement values when 11.6 hoursU-value is 0.15U-value is 0.15Factor = 0.3 Factor = 0.23 Factor = 0.29Values contained in Figure 12 are intended for guidance purposes only.14