What happened
A loft conversion's structural steels were craned in and installed before the engineer's revised padstone details arrived.
How it was discovered
Engineer's site visit the following day showed the wrong padstone material at one end of the main beam.
The consequences
Beam supported, padstone replaced, retrofit reinforcement added. Three weeks delay and a re-design fee from the engineer.
What homeowners can learn
Steel goes in to the latest engineer's details, not to the original drawings. Confirm the revision before craning anything.