Optimisation of retrofit wall insulation: An Irish case study

Ireland has one of the highest rates emissions per capita in world and its residential sector is responsible for approximately 10% total national CO2 emissions. Therefore, reducing this will play a decisive role achieving EU targets by 40% 2030. To better inform decisions regarding retrofit existing building stock, study proposes Optimum Insulation Thicknesses (OIT) typical walls 25 regions Ireland. The calculation OIT includes annual heat energy expenditure, emissions, material payback period. approach taken based on Heating Degree Day (HDD) life cycle cost analysis methods different combinations insulation material, type, Irish wall configuration. Results indicate that increases with increased HDD varies up to 30% from lower higher type materials, configuration, all have significant impact saving potential (up 170 €/m2) carbon emission 50 kg/m2). Analysis Variance (ANOVA) technique used compare mean difference between under savings.