GEORGIAN BUTTERFLY ROOFS & SLATING IN CLERKENWELL EC1
Stretching from the medieval Priory of St John and the eighteenth-century merchants’ houses around Clerkenwell Green, St John’s Square, and Sekforde Street up to the Grade II listed late-Georgian garden terraces of Myddelton Square, Wilmington Square, and Lloyd Square (EC1R, EC1V, and EC1M), pitched roofs in Clerkenwell combine traditional V-shaped London butterfly roofs with steep Victorian warehouse slate pitches and timber sash dormers. Behind yellow London stock brick parapets, two inward-sloping Welsh slate pitches discharge rainwater into a single central lead-lined valley trough running front-to-back between the party walls. When original nineteenth-century iron clout nails rust through—causing slates to slip—or thermal movement splits the central lead box gutter, water tracks straight into upper bedrooms, design studios, and historic lath-and-plaster ceilings. Operating as an NFRC-accredited roofer London conservation homeowners and EC1 commercial estates rely on, London Roofing Specialist deploys directly employed slaters, leadsmiths, and roof carpenters across Clerkenwell.
Treated BS 5534 Timber Battens, Dormer Carpentry & New River Conservation Standards
Stripping a listed EC1 townhouse or multi-storey warehouse pitch begins with a full structural inspection of the exposed C24 timber rafters, central valley sole boards, ridge timbers, and dormer framing. As shown in our project photography, we replace decayed woodwork, dress a high-tensile vapour-permeable breather membrane across the rafters, and fix graded BS 5534 treated timber battens ready for hand-holing and copper-nailing natural slates in strict compliance with London Borough of Islington, Camden, and New River Estate conservation guidelines.
ROLLED LEADWORK, CHIMNEYS & SKYLIGHTS IN CLERKENWELL EC1
Maintaining historic EC1 rooflines requires combining traditional natural slating and clay pantiling with heavy-gauge rolled leadwork and modern Part L thermal upgrades.
Natural Welsh & Spanish Slate Restorations
Hand-sorted, copper-nailed natural slates matched in riven texture, blue-grey hue, and headlap gauge for Clerkenwell Green, Charterhouse Square, and Amwell Street conservation properties.
Code 6 & Code 7 Rolled Lead Butterfly Valleys & Box Gutters
Hand-bossed lead central valley troughs, front parapet box gutters, dormer cheeks, and stepped chimney flashings formed with expansion drips to Lead Sheet Training Academy codes, working alongside our flat roofer Clerkenwell team where pitched slopes meet flat mansard crowns and warehouse decks.
London Stock Chimney Repointing & Lead Saddles
Raking out weathered mortar joints on tall party-wall stacks, repointing yellow stock brickwork in breathable NHL lime mortar, re-bedding terracotta pots, and dressing welded lead back-gutters.
Conservation Velux Windows & Warehouse Northlights
Structural rafter trimming and flush-fitted conservation roof windows weathered with secret lead soakers and insulated timber collars.
Part L Loft Insulation & Ridge Ventilation
Upgrading pitched roofs with high-density rigid PIR thermal insulation boards and continuous eaves-to-ridge airflow to prevent winter condensation.
10-Year Insurance-Backed Guarantees & EC1 Site Management
Working around the narrow historic lanes of Clerkenwell Close, Passing Alley, and Bowling Green Lane—or along busy Red Routes on Farringdon Road, Clerkenwell Road, and Rosebery Avenue—demands disciplined site logistics. Our project managers arrange all Islington and Camden pavement licences and parking bay suspensions in-house, backing every complete pitched roof replacement and leadwork package in EC1 with a 10-year insurance-backed workmanship guarantee and £10m public liability cover. View our wider portfolio.
Call our central London office today for a free, no-obligation Clerkenwell roofing survey: 020 7205 4557
Frequently Asked Questions: Roofer Clerkenwell EC1
Do you comply with New River, Clerkenwell Green, and Charterhouse Conservation Area roofing rules?
Yes. Large parts of EC1 sit within the New River, Clerkenwell Green, Hatton Garden, and Charterhouse Square Conservation Areas, containing hundreds of Grade II listed Georgian terraces around Myddelton Square, Percy Circus, and Sekforde Street. We supply authentic natural Welsh slate and handmade clay tile samples, preserve hidden butterfly roof profiles behind front parapets, and specify traditional rolled lead thicknesses to ensure seamless heritage approval.
Why do central butterfly valley gutters on Georgian terraces in Clerkenwell leak into top-floor rooms?
Houses around Wilmington Square, Chadwell Street, and Great Percy Street rely on a concealed V-shaped central valley gutter to carry rainwater from both inward-sloping slate pitches to the rear hopper head. When original lead bays are laid in over-long sheets without expansion steps, or autumn plane tree leaves block the rear outlet, water backs up underneath the bottom slate courses. We strip the perished trough, re-profile the timber sole board to increase the drainage fall, and install correctly bayed Code 6 or Code 7 welded lead linings with high-capacity leaf guards.
