A recent case at a terraced house in Dublin shows why it pays to dig deeper — literally — before panicking over cracked walls.
Two pre-purchase surveys had flagged cracking as “safety critical” and “structurally significant” but couldn’t agree on a cause, leaving the buyer stuck. So Substruck Ltd. were asked by both the prospective purchaser and vendor to carry out a full investigation: desk study, trial holes, drainage investigation, ground investigation and a report detailing the findings and correct course of action.
The verdict? The foundations were sound, bearing on firm glacial till with no groundwater issues. The real culprit was much less dramatic: historic drying shrinkage, combined with subsequent thermal and moisture-related movement. The absence of movement joints within the terrace contributed to stresses concentrating at natural weak points in the masonry — cracking exactly where you’d expect an unjointed terrace to crack.
This was serviceability and aesthetic damage, not structural failure. No underpinning needed. Just proper crack repair using flexible, movement-accommodating sealant, plus some drainage upgrades as sensible maintenance — sparing everybody the tens of thousands of euro that underpinning and major structural remediation could have cost, not to mention the months of disruption.
The lesson: when survey reports hedge with “could be several things,” that ambiguity itself is the cue to get a proper, evidence-based investigation by a genuine specialist rather than assuming the worst.