Waterproofing of raft foundations is a critical activity in ensuring the long-term durability and water-tightness of any structure. As the raft remains in constant contact with soil and groundwater, even minor lapses in material selection, application, or inspection can lead to severe leakage, deterioration, and costly maintenance.
This Inspection and Test Plan (ITP) outlines the systematic process for reviewing documents, inspecting materials, assessing pre-work conditions, monitoring work in progress, and verifying the final waterproofing performance of the raft. It ensures that all stages comply with project specifications, approved procedures, and international standards, thereby maintaining quality, safety, and structural integrity.
WHAT IS AN INSPECTION AND TEST PLAN (ITP)
Inspection and Test Plans and checklists are integral parts of quality management systems — not only in construction but in almost every industry where Quality Management Systems (QMS) are implemented.
They are considered master documents through which various parameters and activities of a process are monitored and recorded. These records later play a vital role during verification and auditing.
In construction, where numerous trades and activities must be completed — such as structural, finishes, façade, electrical, mechanical, and plumbing works — preparation and implementation of different ITPs form a crucial part of the project quality management system.
To read more about ITPs and how to prepare one, CLICK HERE and refer to the last picture in this post for a quick understanding of an ITP’s structure and how to align it with your project requirements.
INSPECTION AND TEST PLAN FOR WATERPROOFING WORKS
SECTION 1 – DOCUMENTATION REVIEW
This section outlines the review and approval process for all necessary documents before commencing Waterproofing works on-site.
Key documents include:
- Approved drawings and typical details
- Method Statement
SECTION 2 – SUBMISSION OF SAMPLES & MATERIAL APPROVALS
This section outlines the review and approval process for all necessary documents before commencing on-site waterproofing works.
Key documents include:
- Approval of Samples
- Material Submittals
SECTION 3 – INSPECTION OF INCOMING MATERIALS
This section addresses the inspection of materials used in waterproofing works
Points to verify:
- Materials – Waterproofing, PE sheets, and Grouting materials, etc, to conform with approved specifications
- Materials are tested and conform to applicable specifications
Materials are stored as per the required guidelines and standards
SECTION 4 – PRE-WORK INSPECTION
This section focuses on inspections to be carried out before the waterproofing work begins to ensure all prerequisites are met
Checks include:
- Check on materials
- Check for any leak points
- Check on the cleaning of the PCC surface.
- Check the laying of the PE sheet.
These checks help ensure accuracy, consistency before the work
SECTION 5 – WORK IN PROGRESS INSPECTION
During waterproofing work in progress, regular inspections are conducted to ensure that the work meets acceptable quality standards.
Checks typically include:
- Check for mixing of adhesives if it is two two-component adhesives
- Check for for application of the waterproofing compound.
- Check for the application of the waterproofing compound
- Check on rate of application
- Check on the application of the waterproofing compound on the cold joints
These inspections help prevent defects and ensure that waterproofing work meets required standards
SECTION 5 – POST-WORK INSPECTION
After work is completed, an inspection ensures that the finished area for
Checks include:
- Check on final waterproofing
- Check on the treatment of the construction joint
- Check for water tightness
This ITP ensures that waterproofing works for the raft foundation is executed with precision, consistency, and full compliance with project specifications. Through structured inspections at every stage—from documentation to final water-tightness testing—the plan minimizes the risk of leakage, enhances durability, and safeguards the overall performance of the foundation system. When properly followed, this ITP serves as a reliable quality assurance framework, ensuring that the raft remains fully protected against groundwater infiltration throughout the life of the structure.
Click here to understand what an ITP is and prepare one
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Refer to this picture to learn tips on how to customize the ITP depending on Project Requirements
