The record of what actually happened on real MMC projects: the costly mistakes, and the checks that caught a problem before it became one. Every lesson is moderated before publishing, and an organisation can ask to stay anonymous. No lesson is published without one.
Wrong breather membrane spec led to £1m of remedial work
A late supply chain substitution swapped the specified vapour control layer for a vapour permeable breather membrane from the same product family. The delivery paperwork still referenced the original product code, so it was missed at goods in.
What workedA factory witness inspection caught a panel defect before 40 units shipped
A routine witness inspection ahead of a large batch release identified a fixing pattern deviation on the structural panel production line.
Watch outService penetrations were sealed before the electrical first fix was signed off
On a fast-track programme, fire-stopping around service penetrations was completed and boarded over before the electrical first fix inspection had taken place, because the two trades had been sequenced independently in the programme.
What workedA single shared setting-out drawing stopped a foundation misalignment before it happened
The groundworker and the panel manufacturer were each working from their own version of the setting-out drawing, issued a fortnight apart, on a site where the foundation tolerances were tighter than a traditional build.
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