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This one clears Nathan’s name straight away — the leadwork isn’t at fault.
The real lesson is how moisture actually behaves around chimneys, membranes, and modern roof coverings.
Vapour movement, tight-fitting tiles, and poor drainage paths can create damp that looks like a leak but isn’t rain at all.
It’s a reminder that roofing is a system, not just lead and tiles, and small membrane details can make a big difference years later.
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Key Takeaways
• The damp issue is not caused by poor lead flashing — the workmanship is sound.
• Roof leaks can be caused by vapour and condensation, not just rain getting in.
• A cut or poorly detailed breather membrane can quietly channel moisture to one spot.
• Modern man-made tiles fit tightly, limiting airflow and slowing drying.
• Counter-battening creates airflow and drainage, reducing long-term moisture risk.
• Pulling membranes tight increases risk — a slight drape helps moisture run clear.
• Damp patches can appear years after work is completed, masking the true cause.
• Chimneys can absorb water — masonry protection and pot checks still matter.
• Roofing works best as a system, not as isolated components.
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#Roofing
#LeadFlashing
#DampProblems
#ChimneyLeaks
#BreatherMembrane
#RoofVentilation
#CounterBattens
#BuildingScience
#SkillBuilder
