Prioritization of Material Wastage Factors and Quality-Management Practices in Construction Projects Using Relative Importance Index

Abstract

Material wastage is a persistent challenge in construction projects because it affects project cost, schedule performance, work quality, productivity, and environmental sustainability. This study identifies and prioritizes the major factors influencing material wastage and evaluates quality-management practices that can reduce avoidable waste in construction projects. A structured questionnaire was prepared from literature-based factors and validated through expert review before main data collection. The survey responses were analyzed in aggregate form using frequency analysis and the Relative Importance Index (RII) method. The findings indicate that supervision and workforce-related factors form the most critical category affecting material wastage. Rework due to poor workmanship, improper material handling, lack of site supervision, frequent design changes, and poor project planning emerged as the leading causes. The impact analysis showed that material wastage primarily results in rework or repair, project delay, cost increase, and poor work quality. Material inspection before installation, regular site inspections, toolbox talks, worker training, and coordination meetings were identified as important quality-management practices for waste reduction. An integrated material waste reduction and quality-management framework is proposed to support practical implementation at construction sites. To maintain confidentiality, results are presented only as aggregated statistical findings without disclosing respondent identities, organization names, project names, or raw survey data.

Introduction

The text presents a study on construction material wastage and the role of quality-management practices in reducing waste. The construction industry consumes large quantities of materials, making efficient material management essential for controlling project costs, improving productivity, maintaining quality, and achieving sustainability goals. Material wastage occurs through material loss, damage, misuse, over-ordering, surplus, and unnecessary disposal during different construction stages.

The study highlights that construction waste is not merely a site-management issue but a broader planning, procurement, handling, storage, supervision, and quality-management problem. Major causes of wastage include inaccurate estimation, design changes, poor planning, delayed deliveries, improper storage, weak supervision, inadequate worker skills, and rework caused by defective workmanship. Since material costs form a significant portion of project expenses, reducing wastage can substantially improve project performance.

The literature review identifies several dimensions influencing construction waste. Planning and design errors such as inaccurate quantity estimation, incomplete drawings, and frequent design modifications contribute to surplus materials and rework. Procurement-related issues such as over-ordering, poor supplier coordination, and incorrect material specifications create avoidable losses. Handling and storage problems lead to damage, breakage, deterioration, and inefficient material movement. Workforce and supervision issues are identified as major contributors because poor workmanship and delayed defect detection often result in repair and replacement activities. The review also emphasizes the importance of quality-management systems, including inspections, QA/QC procedures, training, documentation, and corrective actions, for preventing waste.

The research identifies a gap in existing studies, as many previous works examine individual waste factors separately rather than integrating material wastage with quality-management practices. To address this gap, the study uses a survey-based approach and applies the Relative Importance Index (RII) method to rank critical wastage factors.

A questionnaire was developed based on literature findings and reviewed by construction experts. Responses were collected from 84 construction professionals, including site engineers, contractors, project managers, quantity surveyors, and procurement officers. The collected data were analyzed using frequency analysis and RII calculations while maintaining respondent confidentiality.

The results show that supervision and workforce-related issues are the most significant contributors to material wastage, followed by planning, handling, and procurement factors. The category-wise ranking indicates:

• Supervision & Workforce-related factors: RII = 0.868 (Very High Priority)
• Impact of Material Wastage: RII = 0.852 (Very High Priority)
• Planning-related factors: RII = 0.843 (Very High Priority)
• Handling-related factors: RII = 0.833 (Very High Priority)

The most critical individual wastage factors identified were:

1. Rework/repair due to material wastage and quality issues – RII = 0.908
2. Rework due to poor workmanship – RII = 0.903
3. Lack of site supervision – RII = 0.900
4. Improper material handling on site – RII = 0.900
5. Frequent design changes – RII = 0.898
6. Poor project planning – RII = 0.898

The findings demonstrate that material wastage is strongly linked with quality failures. Rework caused by poor workmanship results in additional material consumption, increased labour costs, schedule delays, environmental impacts, and reduced client satisfaction. Recommended solutions include implementing inspection and test plans, maintaining rework registers, applying Non-Conformance Reports (NCRs), using Corrective and Preventive Action (CAPA) systems, conducting root-cause analysis, and monitoring quality-related performance indicators.

To reduce workmanship-related waste, the study recommends worker skill assessments, training programs, toolbox talks, method demonstrations, trade-wise competency monitoring, and subcontractor quality evaluation systems. Improving site supervision requires proper manpower planning, inspection responsibility allocation, digital tracking systems, and regular review of defects and corrective actions.

For material handling problems, the study suggests better site logistics planning, appropriate lifting equipment, improved storage arrangements, worker training, and monitoring of material damage. For design-related wastage, formal design-freezing procedures, improved coordination, and controlled drawing revisions are recommended.

Conclusion

The detailed analysis confirms that the highest RII values are not isolated findings; they represent a connected management and execution problem. All respondents rated each of the five factors as High or Very High, showing strong agreement that these issues require immediate attention. Rework/repair is the most important overall impact, while the dominant local drivers differ: design changes in Pune, poor workmanship in Sangli, and lack of supervision together with rework in Kolhapur. Improper material handling remains consistently high across all locations. Therefore, the most effective waste-reduction strategy is preventive rather than corrective. Projects should control design revisions before execution, strengthen supervision, verify worker competency, improve material logistics, and use stage-wise QA/QC with measurable rework and waste indicators. Applying these remedies according to location-specific priorities can reduce material losses, avoid repeated work, improve productivity and enhance project cost, time and quality performance.

References

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Copyright

Copyright © 2026 Sunil K Naik, Dr. D. B. Desai. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.