--- title: "Chimney Flashing Issues Cobham | Signs & Cost 2026" description: "Original lead chimney flashing on Cobham period homes fails silently. Signs, cost and how to repair without a full re-roof." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "Article", "headline": "Chimney flashing issues on older Cobham homes — what to look for", "description": "Original lead chimney flashing on Cobham period homes fails silently. Signs, cost and how to repair without a full re-roof.", "datePublished": "2026-01-12", "dateModified": "2026-01-12", "author": { "@type": "Organization", "name": "Roof Cleaning Cobham" }, "publisher": { "@type": "Organization", "name": "Roof Cleaning Cobham", "url": "https://roofcleaningcobham.co.uk" }, "mainEntityOfPage": "https://roofcleaningcobham.co.uk/blog/chimney-flashing-issues-cobham", "inLanguage": "en-GB" }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://roofcleaningcobham.co.uk/" }, { "@type": "ListItem", "position": 2, "name": "Blog", "item": "https://roofcleaningcobham.co.uk/blog" }, { "@type": "ListItem", "position": 3, "name": "Chimney flashing issues on older Cobham homes — what to look for", "item": "https://roofcleaningcobham.co.uk/blog/chimney-flashing-issues-cobham" } ] } ] --- [![](/assets/logo-Ob-G6GpL.png)Roof Cleaning Cobham Surrey · Est. 2014 ](/) [Home](/) Services [Roof Cleaning Cobham](/roof-cleaning-cobham)[Roof Moss Removal Cobham](/roof-moss-removal-cobham)[Soft Wash Roof Cleaning Cobham](/soft-wash-roof-cleaning-cobham)[Roof Pressure Washing Cobham](/roof-pressure-washing-cobham)[Gutter Cleaning Cobham](/gutter-cleaning-cobham)[Roof Algae Removal Cobham](/roof-algae-removal-cobham)[Roof Cleaning Cost Cobham](/roof-cleaning-cost-cobham)[Tile Roof Cleaning Cobham](/tile-roof-cleaning-cobham)[Slate Roof Cleaning Cobham](/slate-roof-cleaning-cobham)[Roof Restoration Cobham](/roof-restoration-cobham)[Roof Moss Treatment Cobham](/roof-moss-treatment-cobham)[Eco Roof Cleaning Cobham](/eco-roof-cleaning-cobham)[Roof Cleaning Surrey](/roof-cleaning-surrey)[Roof Cleaning Near Cobham](/roof-cleaning-near-cobham)[Roof Inspection Cobham](/roof-inspection-cobham) Areas [Cobham](/areas/cobham)[Esher](/areas/esher)[Weybridge](/areas/weybridge)[Oxshott](/areas/oxshott)[Leatherhead](/areas/leatherhead)[Surbiton](/areas/surbiton)[Kingston upon Thames](/areas/kingston-upon-thames)[Epsom](/areas/epsom)[Guildford](/areas/guildford)[Walton-on-Thames](/areas/walton-on-thames) [Instant estimate](/calculators/instant-estimate)[Cost calculator](/calculators/cost)[Moss checker](/calculators/moss-risk)[Blog](/blog)[About](/about)[Get a quote](/contact) 1. [Home](/) 2. [Blog](/blog) 3. Chimney flashing issues on older Cobham homes — what to look for Issues · 6 min read # Chimney flashing issues on older Cobham homes — what to look for Chimney flashing is the single most common source of leaks on 1930s Cobham semis. Here is exactly what to check for on your own home. ## Why it fails Original code-4 lead has a design life of about 60 years. Most Cobham 1930s stock has never been re-flashed — the lead is now 90+ years old and covered in pinholes invisible from ground level. ## What to look for Damp staining on the ceiling directly around the breast; tide marks running down the chimney brick externally; small mounds of white efflorescence salts on internal chimney walls. Any of these warrant a drone inspection. ## Fixing it Full re-flash in code-5 lead is £550–£950 including scaffold on a standard Cobham semi. A dressed lead patch of a single pinhole is £150–£220 as a same-visit repair alongside a roof clean. ### Get your free roof cleaning quote Fixed-price quote within 24 hours. No call-back chasing — we'll email you. Full name Email address Postcode Property type Semi-detached Detached Terraced Bungalow Other Service required Full roof clean (soft wash) Moss removal Gutter cleaning Roof inspection / drone survey Roof restoration Not sure — please advise Tell us about your roof (optional) Get my free quote We respond by email within 24 working hours. 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