Roger’s back with another viewer question, and this one’s a cracker.
Mark uncovered a crack in his extension wall after stripping back the plasterboard, and it turned out the surveyor had never even seen it. Sound familiar?
If you’ve been losing sleep over a crack in your walls, this one’s for you. Roger breaks down what’s actually going on, why it’s almost certainly nothing serious, and what a few simple brackets and a tube of sealant can do. Job done.
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Key Takeaways:
• Surveys can only report what’s visible — hidden problems often reveal themselves during renovation work
• An even crack from top to bottom typically points to block shrinkage, not structural movement
• Slotted L-shaped galvanised brackets are a simple, effective fix — the slots allow for future movement, just like a slip tie
• The existing timber has been quietly doing a lot of stabilising work — worth replacing its job with a few brackets before boarding over
• On the outside, a mastic movement joint is perfectly normal — re-gun with polymer sealant if it’s pulling away
• Movement joints are best hidden behind downpipes or tucked into corners where possible
• Cracks are rarely as scary as they look — houses are tougher than we give them credit for
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