Aug 21

The Cost of Poor Supervision in Residential Construction: A Structural Remedial Case Study

Why did this happen?!

It started with a small mistake.
A pipe laid without the right slope.
Then the footing went over it.
The frame went up.
Walls and ceilings were plastered.
Everything looked fine on the surface.
But the CCTV inspection uncovered the hidden problem. Water collecting in one spot, all because the pipe wasn’t sloped the way it should have been.
The fix was messy.
Cut three sections out of the footing.
Dig out the soil.
Relay the pipe properly.
Re-pour the concrete.
And that’s where the bigger problems showed up.
The structural engineer had issued a one-page repair method. The mesh size was referenced back to the original design drawings. But the contractor only had the repair sheet. No access to the original design. So when they couldn’t see a mesh size on that one page, they guessed and used a smaller size.
Then the dowel bars were drilled too close to the slab edge, leaving no proper cover. Everywhere you looked, the workmanship was wrong...
When I stepped in, it was clear:
- The repair documents left out some key information.
- Communication between parties was broken.
- No accountability.
- And workmanship that ignored the instructions.
All of it traced back to one mistake…
A pipe that wasn’t laid with the right slope.
The question is, how many problems on site today are quietly waiting to snowball from one small oversight like this?

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MOLY ASHTARI 
Senior Structural Engineer