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Lead Flashing Failures in Nottingham Guide

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Lead Flashing Failures in Nottingham: Causes, Signs and Fixes

Lead flashings fail from thermal fatigue after decades of expansion and contraction. Chimney flashings are the most common leak source in Nottingham. Proper replacement uses code 5 lead chased 25mm into mortar joints. Costs £250-£800 depending on the junction.

Why They Fail

Lead expands and contracts with temperature. Over decades, thermal cycling causes creep — slow stretching and thinning at stress points. Eventually fatigue cracking. East Midlands range: -10°C to 35°C creates significant movement. South-facing chimneys fail fastest.

Common Failure Points

Chimney back gutters. Stepped side flashings where chase pointing has cracked. Abutment flashings at extensions. Valley flashings. Bay window lead gutters on Victorian terraces in Sherwood, Mapperley and West Bridgford.

Signs to Watch

Damp patches near chimneys or extensions. Visible gaps between lead and brickwork. Lead lifted from wall face. Cracks in lead surface. Sealant patches — sign of temporary fix, not proper repair.

Proper Replacement

Chase new lead 25mm into mortar joints. Wedge with lead wedges, point with lime mortar on period properties. Code 5 for chimney flashings, code 4 for valleys. Sized within LSA maximum dimensions to prevent thermal creep.

Costs

Single chimney apron: £180-£350. Full chimney re-flash: £400-£800. Valley replacement: £400-£900. Bay window gutter: £500-£1,200. Wide ranges reflect access, lead code weight and junction complexity.

Sealant Is Not a Fix

Sealant over cracked lead lasts 6-18 months. Underlying lead has failed and needs replacing. Continued sealing conceals water damage getting worse. Every sealant patch we remove reveals months of hidden damage.

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Last reviewed: 2026-07-20 by Nottingham Roofing Experts

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