How do you check paving blocks competency in Qardho?

Paving blocks competency claims in Qardho are only as good as the evidence behind them. The claim is easy to make and hard to test once the crew has moved on. Ask for laying records, a sample panel and a named supervisor before work starts, and the gap between what a contractor says and what a contractor can do becomes visible early.

What does a paving blocks competency claim actually prove in Qardho?

A claim tells you what a contractor says; the records and a site visit tell you what the crew has done. Paving depends on several separate skills: preparing and compacting the bedding, keeping the correct fall to a drainage outlet, cutting edge blocks, and filling joints. A contractor may be strong in earthworks and weak in joint filling, or the reverse. Ask which of those tasks the named foreman personally ran on the last job, and on what surface. Request photographs of that work taken during laying, not after. Ask which engineer inspected it and whether any written instruction was issued. Ask your own project's supervising engineer for the inspection records, because those are the notes that show who checked what.

How do paving defects show up later?

Uneven surfaces and rocking blocks appear because the layers under them fail, not because a block is bad. Water reaches the bedding through open joints, softens it, and traffic pumps the blocks up and down. If a block moves, joint sand can wash out and the gap may widen. That is why joint width, joint fill and edge restraint matter as much as the block itself. General practice is to lay blocks on a compacted, level bedding course, keep joints narrow and even, and restrain the edges against kerbs or concrete; confirm the actual joint width and bedding against the project specification. Where a block surface meets a drainage channel, the fall must run to the outlet rather than pond in the middle. A surface that holds water after rain points to a fall or bedding problem, and the repair is usually deeper than replacing a few blocks.

How do you test the claim before bulk laying?

Ask for a full-size sample panel and inspect it before the main area is laid. The panel should sit on the same bedding and compaction the job will use, with the same joint fill and edge detail, so it tests the method rather than the marketing. Then do the following:

• Request a written method statement naming the bedding material, compaction equipment and joint fill.
• Ask for test or inspection records for the sub-base, or agree how the sub-base will be checked.
• Get the name of the supervisor who will be on site daily, and who that person reports to.
• Walk a recently paved surface the contractor built, with joints and edges examined.

What to do next

Consider writing the sample panel, method statement and supervisor name into the contract or order, and agree with your project team who signs off each stage. Then request the contractor's last two paving jobs and visit one of them with a level and a tape. If the contractor cannot supply records or a site to walk, treat the competency claim as unverified and get independent supervision from a qualified engineer.