In brief
- A supervisor who cannot read a drawing cannot catch a wrong bar diameter, a missing lap or a wrong level before the concrete goes in.
- Ask for signed inspection sheets, not just daily attendance, and compare them with the reinforcement actually placed.
- Open one completed element in a test pit, measure it against the drawing, and let the result settle the argument.
Contents
A drawing on a Qardho site only controls the work if the person holding it can read it. Where drawing literacy and supervision gaps combine, wrong bar sizes, missing laps and wrong levels get built in and covered up. Signatures on an attendance sheet do not change what ended up inside the concrete.
What do drawing literacy supervision gaps look like on a Qardho site?
A supervisor who cannot read a drawing can still stand on site all day. The problem is what that person cannot catch. The bar schedule calls for one size and the steel on the ground may be another. A detail note calls for a lap at a support; the steel may be butted and wired. A level note puts a slab at one height; the formwork may sit lower because that is where the ground is.
The person checking needs to match symbols to steel, dimensions to tape measurements, and section details to what is built. That is a skill, learned by practice on real drawings, and it can be weak even in someone with long site experience. The usual warning is a supervisor who does not carry a marked-up drawing, cannot say which revision is current, or answers a question about a bar size by looking at the steel rather than the paper.
How do missed detail checks show up after the pour?
Most failures from this gap show up after the concrete is placed, when correction costs far more than prevention. A slab cast at the wrong level forces thicker screed or a stepped floor. Bars that are short, wrongly spaced or missing a lap reduce the capacity the drawing assumed. Cover that no one measured lets damp and salt reach the steel in coastal air, even far inland.
Weak supervision also leaves gaps in the records. If no one signed for reinforcement inspection, cover measurement or formwork alignment before the pour, the client cannot tell later whether the work was checked or just poured. A practical check on any site is to walk it with the drawings in hand: measure a bar spacing, tape a cover, open one element in a test pit, and compare it with the section. Ask the municipal engineer's office what approval steps apply to the plot, and ask the contractor for the inspection sheets that match each pour.
How do you close the gap before the next pour?
Close it by making the drawing check an event with a signature, not a habit. Set a reinforcement and formwork inspection before every pour, with the current drawing revision on site and a marked-up copy for the check. Photograph the steel with a tape across the spacing and record the date, element and bar sizes. Add a short weekly session where the supervisor explains one detail to the crew and shows the drawing behind it.
Where the skills are not there yet, hire or train for that specific task before the next structural pour. If the mix of literacy and authority is uncertain, bring in an independent checker for the critical elements. Confirm what the contract allows for inspection, sign-off and rework, and put all instructions in writing so both sides work from the same revision.
What to do next
Pick one completed element on your site and check it against the drawing before the next pour: measure bar spacing and cover with a tape, photograph the result, and note the drawing revision used. Then ask the contractor for the signed inspection sheets for that element. If they cannot produce them, agree in writing on the inspection and record-keeping steps before further structural work.
Frequently asked questions
Can a supervisor read drawings but still miss errors?
Yes. Reading a drawing and checking work against it are different tasks. The check needs the current revision on site, a tape and a signed record for each element, not just the ability to read the sheet.
What should a client ask for at handover?
Ask for inspection records that name the element, the date, the drawing revision and the person who signed, plus photographs of the reinforcement before each pour.
Local reporting: this article is written for building work in Qardho and Puntland. Ground conditions, prices and rules differ between places; confirm the details for your own site.