Purpose Construction industry hesitates to associate Green concepts on building projects mainly due to its high initial investment cost. Even if it is economical in the long run, often the benefits are suppressed with the costs generated through non-value-adding activities in the construction process. Lean construction principles have proved to eliminate such waste while enhancing the construction process. Thus, the purpose of this paper is to explore the applicability of the integration of Lean and Green concepts in the construction industry. Design/methodology/approach The fundamental principles of both Lean and Green construction were evaluated through an extensive literature survey. A qualitative approach was adopted, and thus, based on the literature findings, expert interviews were conducted with professionals having experience in both Green and Lean concepts. Furthermore, the findings were validated through experts to analyse the adaptability of the integration. Content analysis technique was utilised with NVivo software programme to analyse the findings. Findings The integration of the Green concept was found to alter the traditional application of Lean concept, considering the social and environmental aspects without limiting to economic considerations. The study revealed that the perception of the Sri Lankan stakeholders towards the application of integrated Lean-Green concept is focussed on a positive direction. As a result, the identified enablers to implementing the integrated concept supersede the barriers by confirming the appropriateness of the application in the local construction industry. Originality/value A framework was developed through the findings to guide the implementation of integrated Lean-Green application in Sri Lankan context.

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The construction of pile foundation is a multifaceted activity among rest of the construction activities that are performed by heavy machines, materials, and energy sources generating substantial amount of CO2 and greenhouse gases along with many other forms of environmental pollution. Sustainable piling construction guarantees that the whole piling process meets environmental sustainability and ultimately human health and wellbeing. Many countries around the world, including United States, China, the United Arab Emirates, are in the forefront of reengineering piling construction activities. Implementation of sustainable practices in piling construction Sri Lanka is still at a low level. Succinctly, several hindrances and barriers can be identified when adopting sustainable piling construction practices. Hence, the aim of this paper is to identify the environmental impact due to the current piling construction practices in Sri Lanka and to investigate barriers in implementing sustainable piling construction practices. A questionnaire survey was conducted among thirty (30) experts in piling construction. Significant barriers were identified using the relative importance index technique in data analysis. The findings revealed that among the ten (10) barriers identified, cost overrun and poor pile design, investment risk, lack of awareness of sustainable techniques and technologies as the top three (3) barriers in implementing sustainable piling construction practices. The study clearly identified the need for improving sustainability practices that can also enhance cost-effectiveness and performance efficiency. Findings of this study will be useful in formulating strategies to overcome the barriers and improve sustainability practices in the local construction industry.

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The green wall concept has been introduced as one of the solutions to reduce energy demand for ventilation requirements while improving the natural vegetation in dense urban areas. Past studies revealed that the energy-saving of green walls can vary substantially, from 35% to 90% across countries such as United Kingdom (UK), Canada, Russia, Greece, China, Saudi Arabia, India, and Brazil. Given these differences in energy saving of green walls due to climatic conditions and other reasons, direct application of such findings to the Sri Lankan context is questionable. Therefore, this study aimed to assess the thermal performance of green wall applications in Sri Lanka through a case study analysis of an indirect green façade with a comparative conventional wall. The required data were extracted through on-site temperature measurements from different points of both the exterior and interior wall surfaces of each building in different time intervals per day for a period of fourteen days spanning from October to November. The analysis shows that the green walls contribute to 21% - 36% of temperature difference compared to the conventional wall. Eventually, this results in 0.06 kWh of energy-saving per m2 of wall area, and thereby green walls contribute to the 80% energy saving for ventilation requirements. Hence, the study recommends that the use of green walls can be considered as one of the energy efficiency solutions while improving natural vegetation in tropical climatic cities and absorbing other benefits of green walls.