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Vertical greenery systems (VGS) have been a widely accepted design strategy that contributes to creating sustainable built environments. However, green building technologies (e.g. VGS) have grown in complexity which poses maintainability challenges. Designing with maintainability in mind is crucial in delivering efficient and sustainable buildings. This paper aims to assist designers and allied professionals in terms of integrating maintainability and sustainable design in developing high-rise VGS directly from its design inception.

The study is grounded on the “Green Maintainability” concept which link maintainability, sustainability and facility management right at the outset. The Green Maintainability factors are translated into critical design criteria which are used to analyze the selected instrumental case studies to evaluate the high-rise VGS performance and maintainability potential. A qualitative approach via the triangulation of data collected from relevant literatures, field surveys and walkthrough interviews is undertaken.

Findings have shown that the major VGS defects which are mostly occurring in the case studies are issues concerning fallen leaves and dirt accumulation; safety issues during cleaning and repairs; insufficient maintenance access; algae/ mould growth; withering plants; water stagnation/ ponding; poor/faulty irrigation and water dripping and unavailability of natural elements. Best practices and lessons learned revealed few design oversight and technical issues concerning high-rise VGS façade implementation. While maintenance cost, biodiversity and lack of coordination among involved professionals are the additional issues which emerged during the stakeholders’ walkthrough interviews.

Current researches conducted on the maintainability of green building technologies (e.g. high-rise VGS) are still few. This research study is the first comprehensive assessment to determine the green maintainability potential and performance of high-rise VGS in tropical conditions.

The self-cleaning properties of nanostructured titanium dioxide facade coatings are useful in Singapore's tropical climate. However, its potential maintenance issues need to be determined right at the design stage. The purpose of this paper is to highlight the development of the design for maintainability tool which is a multicriteria design decision score sheet that evaluates the maintainability potential of nano-facade coating applications on high-rise façades with concrete and stonemasonry finishes and curtain walls.

Quantitative methods (expert and practitioner surveys) are conducted in this research study. Analytic hierarchy process (AHP) and sensitivity analysis were used to develop a robust Design for Maintainability tool.

Safety measures indicator received the highest weighted score by experts, while the maximizing performance, minimizing risk, minimizing negative environmental impact and minimizing consumption of matter and energy were the top ranking main criteria by both experts and practitioners. The top ranked design for maintainability sub-criteria identified by practitioners and experts were risk management, maintenance considerations, climatic conditions, safety measures, lifecycle cost and maintenance access, sun's path, rainfall intensity, biological growth measures and building age profile.

Most researches on the maintainability of nano-façade coatings uses experimentation to test the durability of nano-façade coatings, while this study focuses on design based empirical data such as establishing and ranking the list of design for maintainability criteria or indicators to minimize future defects and maintenance issues. The design for maintainability tool contributes to the maintainability of nano-façade coatings leading to maximizing its performance while minimizing cost, risks, resource consumption and negative environmental impact.

Besides designing a comprehensive building maintainability scoring system, this paper aims to develop a standard and reliable method for acquisition of tacit knowledge in facility management (FM) and convert the same into organizational records so that the current dearth of information and poor feedback leading to recurrent defects and arbitrary FM strategies can be eliminated.

Nine major building elements in terms of maintainability were compared by analytic hierarchy process (AHP). Various aspects of consistency checking and group decision making were reviewed to find the best suitable method. During data collection via an AHP questionnaire in face‐to‐face interviews, logical reasoning employed by experts was noted and later matched with the subjective data.

It was observed that technical viability of services and business profile given by building height and location, respectively, set different priorities for major building elements. HVAC system is the prime element followed by elevator and façade. Such priorities can be derived from consistent judgment which improves steadily with a decision‐maker's work experience. A threshold of 10 per cent consistency and aggregating individual priorities (AIP) using geometric mean method of AHP were found most appropriate.

Adaptation of this framework will help industry experts to document their tacit knowledge in a structured manner without facing present constraints. By tracking the recorded facts and logical reasoning, neophytes can learn the multi‐faceted aspects of FM without trial and error.

This research establishes AHP as a standard and reliable method for knowledge acquisition and thus elevates its status from a multi‐criteria decision analysis tool to decision enhancement tool.