Roofline, Fascia, Soffit, and Gutter Replacement in London Victorian Terraces

BEFORE SPECIFYING ROOFLINE REPLACEMENT WORKS, A PROPER ASSESSMENT OF THE CONDITION OF THE EXISTING ROOFLINE AND THE RAFTER ENDS BEHIND IT IS ESSENTIAL.

ROTTED RAFTER ENDS: THE MOST SERIOUS FINDING IN A LONDON TERRACE ROOFLINE ASSESSMENT IS ROTTED RAFTER ENDS — TIMBER RAFTER FEET THAT HAVE DECAYED BECAUSE WATER FROM OVERFLOWING OR LEAKING CAST IRON GUTTERS HAS SOAKED INTO THE END GRAIN OF THE RAFTERS OVER YEARS OR DECADES. ROTTED RAFTER ENDS SIGNIFICANTLY WEAKEN THE STRUCTURAL CONNECTION BETWEEN THE ROOF SLOPE AND THE WALL PLATE — AND MUST BE REPAIRED BEFORE NEW FASCIA IS FIXED. EPOXY REPAIR METHODS (RONSEAL HIGH PERFORMANCE WOOD FILLER FOR MINOR ROT; LTV REPAIR SYSTEM OR EPAFIL FOR STRUCTURAL EPOXY RAFTER END CONSOLIDATION AND EXTENSION) CAN BE USED FOR ROT AFFECTING LESS THAN 30% OF THE RAFTER END CROSS-SECTION. WHERE ROT IS MORE EXTENSIVE, NEW C24 TREATED SOFTWOOD RAFTER FEET MUST BE SPLICED TO THE EXISTING RAFTERS WITH STEEL GANG NAIL PLATES OR STRUCTURAL SCREWS.

FASCIA BOARD CONDITION: ORIGINAL TIMBER FASCIA BOARDS IN LONDON VICTORIAN TERRACES ARE TYPICALLY 25MM X 150MM OR 25MM X 175MM SAWN SOFTWOOD, FIXED TO THE RAFTER ENDS. WHERE PAINT HAS FAILED OR GUTTERS HAVE LEAKED, THE FASCIA WILL HAVE ABSORBED MOISTURE AND BEGUN TO DECAY — PARTICULARLY AT THE TOP ARRIS WHERE THE GUTTER HANGS. THE BACK FACE OF THE FASCIA (AGAINST RAFTER ENDS) IS THE FIRST AREA TO DECAY — NOT ALWAYS VISIBLE ON EXTERNAL INSPECTION.

SOFFIT BOARD CONDITION: ORIGINAL SOFFIT BOARDS IN LONDON TERRACES ARE OFTEN TONGUE-AND-GROOVE SOFTWOOD OR FLAT SOFTWOOD BOARDING NAILED TO LOOKOUT PIECES (SHORT HORIZONTAL TIMBERS FROM THE WALL TO THE RAFTER FOOT). SOFFIT ROT IS CAUSED BY CONDENSATION FROM ABOVE (WARM MOIST AIR FROM THE LOFT MEETING COLD SOFFIT SURFACE) AND BY DRIVING RAIN FROM BELOW.

THE CHOICE OF REPLACEMENT FASCIA AND SOFFIT MATERIAL IS PRIMARILY BETWEEN UPVC, ALUMINIUM, AND TREATED TIMBER. EACH HAS DIFFERENT AESTHETIC AND MAINTENANCE IMPLICATIONS IN A LONDON PERIOD PROPERTY CONTEXT.

UPVC FASCIA AND SOFFIT (THE DOMINANT CHOICE IN VOLUME LONDON ROOFLINE REPLACEMENT): UPVC FASCIA AND SOFFIT BOARDS ARE THE MOST WIDELY INSTALLED REPLACEMENT ROOFLINE MATERIAL IN LONDON RESIDENTIAL PROPERTIES — THEY ARE LOW-MAINTENANCE (NO PAINTING REQUIRED AFTER INSTALLATION), RESISTANT TO ROT AND INSECT ATTACK, AND AVAILABLE IN WHITE, CREAM, BROWN, AND ANTHRACITE GREY. MAIN UPVC ROOFLINE BRANDS USED BY LONDON CONTRACTORS: SWISH BUILDING PRODUCTS (SWISH VANTAGE FASCIA — THE MOST WIDELY USED TRADE UPVC FASCIA IN LONDON; AVAILABLE IN 150MM AND 175MM WIDTHS, 5M LENGTHS, WHITE AND CREAM — ALSO WOODGRAIN FINISHES). KAYFLOW BY SAINT-GOBAIN (ANOTHER LONDON TRADE BRAND — WIDELY USED BY LONDON ROOFING CONTRACTORS). FASCIA AND SOFFIT UPVC BOARD THICKNESSES: 16 TO 18MM FOR MODERN UPVC FASCIA — THICKER THAN ECONOMY BOARDS FOR BETTER IMPACT RESISTANCE AND DIMENSIONAL STABILITY.

ALUMINIUM FASCIA AND SOFFIT (THE PREMIUM CHOICE — APPROPRIATE FOR HIGH-SPECIFICATION LONDON RENOVATION): ALUMINIUM ROOFLINE SYSTEMS (LINDAB, GUTTATEC, OR BESPOKE POWDER-COATED ALUMINIUM FABRICATIONS) OFFER SUPERIOR DURABILITY AND A SHARPER PROFILE THAN UPVC — THE MATERIAL IS STIFFER, CAN BE POWDER-COATED IN ANY RAL COLOUR (ANTHRACITE GREY RAL 7016, BASALT GREY RAL 7012), AND HAS A MUCH LONGER SERVICE LIFE (40+ YEARS VS TYPICALLY 20 TO 30 YEARS FOR UPVC). ALUMINIUM ROOFLINE SYSTEMS ARE INCREASINGLY SPECIFIED FOR HIGHER-SPECIFICATION LONDON TERRACE RENOVATION PROJECTS WHERE ANTHRACITE GREY GUTTERING AND FASCIA COMPLEMENT DARK-FRAMED ALUMINIUM WINDOWS AND DOORS.

TIMBER FASCIA (FOR CONSERVATION AREAS AND LISTED BUILDINGS): FOR LONDON PROPERTIES IN CONSERVATION AREAS OR LISTED BUILDINGS, PAINTED TIMBER FASCIA AND SOFFIT MAY BE REQUIRED TO MAINTAIN THE PERIOD CHARACTER OF THE ROOFLINE. TREATED SOFTWOOD (TANALISED C16 OR C24) OR ACCOYA ACETYLATED SOFTWOOD (CLASS 1 DURABILITY — THE PREMIUM TIMBER OPTION FOR EXTERNAL FASCIA) SHOULD BE SPECIFIED. ACCOYA FASCIA, WHILE MORE EXPENSIVE (APPROXIMATELY 3X THE COST OF STANDARD TREATED SOFTWOOD), HAS DRAMATICALLY BETTER MOISTURE RESISTANCE AND REDUCED MAINTENANCE CYCLE.

THE GUTTERING SPECIFICATION IS PARTICULARLY IMPORTANT FOR LONDON VICTORIAN TERRACES — THE ORIGINAL GUTTERS WERE CAST IRON IN CHARACTERISTIC PROFILES (OGEE — THE "S-PROFILE" MOULDED GUTTER THAT IS ALMOST UNIVERSAL ON VICTORIAN LONDON TERRACES; AND DEEP ROUND HALF-ROUND GUTTERS ON SOME PROPERTIES).

CAST IRON OGEE GUTTERS (THE AUTHENTIC ORIGINAL PERIOD MATERIAL FOR VICTORIAN LONDON TERRACES): CAST IRON OGEE GUTTERS CAN STILL BE SOURCED NEW FROM: SAINT GOBAIN PAM BUILDING (FORMERLY SERVICING THE CONTRACTOR MARKET — CAST IRON HALF-ROUND AND OGEE GUTTERS, SIZES 100MM AND 115MM). YBS CAST IRON (STOCKED BY JEWSON AND TRAVIS PERKINS). THE ADVANTAGE OF CAST IRON GUTTERS IS THEIR AUTHENTIC PERIOD APPEARANCE AND VERY LONG POTENTIAL LIFE (50+ YEARS IF PAINTED REGULARLY AND KEPT CLEAR OF DEBRIS). THE DISADVANTAGE IS WEIGHT (FIXING MUST BE TO SOUND RAFTERS OR RAFTER FEET), SUSCEPTIBILITY TO CRACKING IF BLOCKED AND WATER FREEZES, AND MUCH HIGHER MATERIAL AND INSTALLATION COST THAN UPVC.

ALUMINIUM OGEE GUTTERS (THE BEST PERIOD-AUTHENTIC ALTERNATIVE TO CAST IRON): ALUMINIUM OGEE GUTTERS (LINDAB OGEE ALUMINIUM GUTTER SYSTEM OR BESPOKE ALUMINIUM OGEE IN POWDER-COATED BLACK OR ANTHRACITE) MATCH THE PROFILE OF ORIGINAL VICTORIAN CAST IRON GUTTERS IN APPEARANCE BUT ARE LIGHTER WEIGHT, WILL NOT RUST OR CRACK IN FROST, AND HAVE A LIFE EXPECTANCY OF 30 TO 50 YEARS WITHOUT PAINTING.

UPVC OGEE GUTTERS (THE MAINSTREAM VOLUME CHOICE): UPVC OGEE GUTTERS (MARSHALL TUFFLEX, FLOPLAST, MARLEY — 110MM OR 115MM OGEE PROFILE) ARE THE MOST WIDELY INSTALLED GUTTER TYPE ON LONDON VICTORIAN TERRACES UNDERGOING ROOFLINE REPLACEMENT. THEY ARE INEXPENSIVE (£4 TO £8 PER LINEAR METRE SUPPLY), EASY TO CUT AND JOIN, AND REQUIRE NO PAINTING. HOWEVER, THEY DO NOT MATCH THE VISUAL WEIGHT AND ROBUSTNESS OF ORIGINAL CAST IRON OGEE GUTTERS — PARTICULARLY AT GUTTER ANGLES, WHERE UPVC MITRE JOINTS LOOK NOTICEABLY DIFFERENT FROM CAST IRON CAST CORNERS.

THE SOFFIT BOARD IS ALSO THE PRIMARY VENTILATION POINT FOR COLD LOFT SPACES IN LONDON VICTORIAN TERRACES — AND THIS VENTILATION FUNCTION IS A BUILDING REGULATIONS REQUIREMENT THAT MUST BE MAINTAINED WHEN SOFFITS ARE REPLACED.

APPROVED DOCUMENT C (RESISTANCE TO MOISTURE) VENTILATION REQUIREMENTS FOR COLD PITCHED ROOFS: FOR A PITCHED ROOF WITH INSULATION AT CEILING LEVEL (COLD LOFT — THE STANDARD LONDON VICTORIAN TERRACE CONFIGURATION): A VENTILATION OPENING EQUIVALENT TO A CONTINUOUS 25MM GAP ALONG BOTH SIDES OF THE ROOF (BOTH EAVES) IS REQUIRED. THIS PREVENTS CONDENSATION IN THE COLD LOFT SPACE ABOVE THE INSULATION BY ALLOWING CROSS-VENTILATION OF MOIST AIR.

SOFFIT VENT OPTIONS FOR LONDON ROOFLINE REPLACEMENT: UPVC SOFFIT BOARDS WITH PRE-PUNCHED VENTILATION SLOTS (EVERY 500MM TO 600MM ALONG THE SOFFIT — THE MOST COMMON APPROACH IN VOLUME UPVC ROOFLINE INSTALLATIONS): SWISH VANTAGE SOFFIT WITH VENTILATION INSERTS PROVIDES THE REQUIRED EQUIVALENT OPENING AREA IF INSTALLED CORRECTLY. CONTINUOUS PLASTIC EAVES VENT STRIP (MARLEY EDGEMASTER OR SOFFITVENT STRIP) INSERTED BETWEEN SOFFIT AND RAFTER FOOT: PROVIDES A CONTINUOUS 25MM EQUIVALENT OPENING ALONG THE FULL EAVES LENGTH — THE MOST RELIABLE AND BUILDINGREGULATION-COMPLIANT APPROACH.

CRITICAL INSTALLATION NOTE: INSULATION IN THE COLD LOFT MUST NOT BLOCK THE VENTILATION PATH AT THE EAVES. A 50MM CLEAR VENTILATION GAP MUST BE MAINTAINED BETWEEN THE TOP OF THE EAVES INSULATION AND THE UNDERSIDE OF THE ROOF DECK ABOVE THE EAVES LEVEL. PROPRIETARY EAVES VENTILATION TRAYS (POLYPIPE OR EQUIVALENT) ARE FIXED BETWEEN RAFTERS AT THE EAVES TO HOLD THE INSULATION BACK FROM THE EAVES AND MAINTAIN THE VENTILATION PATH.

THE INSTALLATION SEQUENCE FOR A LONDON TERRACE ROOFLINE REPLACEMENT IS IMPORTANT — GETTING THE ORDER OF OPERATIONS RIGHT PREVENTS WATER INGRESS DURING WORKS AND ENSURES THE NEW ROOFLINE IS CORRECTLY DETAILED.

1. SCAFFOLD OR TOWER SCAFFOLD ERECTED ALONG THE RELEVANT ELEVATION (REAR OR FRONT — LONDON TERRACE FRONT ELEVATION TYPICALLY REQUIRES A LICENSED SCAFFOLD LICENCE FROM THE LOCAL BOROUGH). 2. EXISTING GUTTERS CLEARED AND DOWNPIPES CAPPED (TO PREVENT DEBRIS BLOCKING UNDERGROUND DRAINS DURING WORKS). 3. EXISTING GUTTERS REMOVED. 4. EXISTING FASCIA AND SOFFIT REMOVED — EXPOSING RAFTER ENDS. 5. RAFTER ENDS INSPECTED AND ANY ROT REPAIRED (EPOXY CONSOLIDATION FOR MINOR ROT; SPLICE REPAIR FOR MAJOR ROT). 6. NEW SOFFIT BOARD FIXED TO LOOKOUT PIECES (OR TO WALL IF FLUSH SOFFIT — SOME LONDON VICTORIAN TERRACES HAVE NO OVERHANG AND THE SOFFIT IS FLUSH WITH THE WALL FACE). 7. NEW FASCIA FIXED TO RAFTER ENDS — LEVEL AND PLUMB. 8. CONTINUOUS EAVES VENTILATION STRIP FIXED BETWEEN SOFFIT AND FASCIA / RAFTER FOOT. 9. NEW GUTTERS FIXED TO FASCIA BRACKETS (OR DIRECTLY TO RAFTERS FOR CAST IRON OVER RAFTER-END FIXING). 10. DOWNPIPES RECONNECTED TO UNDERGROUND DRAINS. 11. FINAL CHECKS ON GUTTER FALL (MINIMUM 1:600 — 1.6MM PER METRE — TOWARDS DOWNPIPE).

ROOFLINE REPLACEMENT COSTS IN LONDON DEPEND ON MATERIAL CHOICE, ELEVATION LENGTH, ACCESS REQUIREMENT (SCAFFOLD TYPE), AND EXTENT OF RAFTER END REPAIRS.

UPVC FASCIA, SOFFIT, AND OGEE GUTTER REPLACEMENT (STANDARD LONDON VICTORIAN TERRACE REAR ELEVATION — 7M TO 8M LONG, INCLUDING SCAFFOLD): £1,500 TO £3,000 FOR SUPPLY AND INSTALL INCLUDING SCAFFOLD HIRE.

ALUMINIUM OGEE GUTTER WITH UPVC FASCIA/SOFFIT (REAR ELEVATION): £2,000 TO £4,000.

CAST IRON OGEE GUTTER WITH TREATED TIMBER FASCIA/SOFFIT (FRONT ELEVATION OF CONSERVATION AREA LONDON TERRACE): £3,000 TO £7,000 FOR FRONT ELEVATION (TYPICALLY SHORTER BUT HIGHER SPECIFICATION, INCLUDES STREET-LEVEL SCAFFOLD LICENCE COST).

FULL HOUSE ROOFLINE REPLACEMENT (FRONT AND REAR ELEVATIONS — BOTH FASCIA/SOFFIT/GUTTER): £3,500 TO £8,000 IN UPVC. £5,000 TO £12,000 IN ALUMINIUM OR CAST IRON. RAFTER END REPAIRS: ADD £500 TO £2,500 DEPENDING ON EXTENT OF DECAY FOUND ON REMOVAL OF EXISTING FASCIA.

DOWNPIPE REPLACEMENT (PER DOWNPIPE, 3M TO 5M HEIGHT, INCLUDING CONNECTION TO UNDERGROUND DRAIN): £150 TO £350.