HomeServices Areas We CoverOur WorkAboutReviewsBlogContact07415 302 589Get a Free Estimate - Home - Services - Flat Roof RepairFlat Roof Repairs — North London # Flat Roof Repairs That Stop the Leak and Fix the Root Cause Patching a flat roof without diagnosing the underlying problem is throwing money away. We find the real cause, repair it properly, and guarantee the fix — so you only pay once. Get a Free Estimate Call Now ★ Repairs all systems (felt, EPDM, GRP) · Same-day service · Fixed-price quotes 15+ Years Experience 2,000+ Jobs Completed Written Guarantee Fully Insured Same-Day Response ## When Does a Flat Roof Need Repairing? Flat roofs need repair when their waterproof membrane has been compromised — whether by age, storm damage, impact, or poor original installation. Common signs include water stains on the ceiling below, blistering or bubbling on the roof surface, ponding water that doesn't drain within 48 hours, and visible cracks or splits in the membrane. The challenge with flat roof repairs is accurately diagnosing where the water is actually getting in. Water on a flat roof can travel horizontally along the deck before finding a gap to drip through, meaning the leak on your ceiling might be metres away from the actual point of entry on the roof surface. At AC Roofing & Carpentry Ltd, we repair all types of flat roofs including felt, EPDM rubber, GRP fibreglass, asphalt, and single-ply membrane systems. Our repair process always starts with diagnosis — we trace the leak back to its source and fix the cause, not just the symptom. We provide flat roof repairs across North London with same-day availability for urgent leaks. Most repairs are completed in a single visit, and every repair comes with a fixed-price quote and written guarantee. Real Work ## See Our Flat Roof Repair Projects ## Why Most Flat Roof Repairs Fail Within a Year The roofing industry's dirty secret: most flat roof repairs fail because the roofer fixed the wrong thing. They see a crack, patch it, collect payment, and leave. But the crack was a symptom of ponding water caused by inadequate falls, and within six months the patch has failed and the leak is back — often worse than before. Another common failure: using the wrong repair material. Applying a felt patch to a GRP roof, or using general-purpose sealant on EPDM. Each flat roofing system requires its own repair materials and techniques. Using the wrong ones creates a repair that looks fine initially but has no chemical bond with the existing membrane and fails rapidly. DIY flat roof repairs are particularly problematic. The products sold at DIY stores — brush-on sealants, self-adhesive patches, bitumen paint — are designed for temporary emergency use, not permanent repair. They break down under UV exposure and thermal cycling within months. Homeowners who've applied multiple layers of bitumen paint have often made the eventual professional repair more difficult and expensive. The financial reality: paying £200 for a bodge repair three times costs more than paying £400 for a proper fix once. Every failed repair also means more water damage to the structure beneath, which adds to the final bill when the job is eventually done correctly. How We Work ## Our Flat Roof Repair Process 1 ### Leak Tracing We trace the water path to identify the actual entry point — not just the drip. 2 ### Root Cause Analysis We determine why the failure occurred — age, ponding, impact, or installation defect. 3 ### Material-Matched Repair We use repair materials specifically designed for your flat roof system. 4 ### Drainage Check We verify water flow and falls to prevent future ponding. 5 ### Test & Guarantee Water test where possible, clean-up, and written guarantee issued. Why It Matters ## Flat Roof Repairs Done Right ### Accurate Diagnosis We find the real cause, not just the visible symptom. ### System-Specific Repairs Correct materials matched to your existing roof system. ### Same-Day Availability Urgent leaks addressed the same day in most cases. ### Fixed-Price Quotes No call-out fees. No hidden charges. Clear pricing upfront. ### Guaranteed Fix Every repair backed by a written workmanship guarantee. ### Honest Assessment If repair isn't viable, we'll tell you — never patch what should be replaced. ## Flat Roof Repair: Methods and Considerations ### Felt Roof Repairs Felt roof repairs involve cutting away the damaged section, drying the deck beneath, and torch-applying a new patch of compatible felt membrane. The patch must extend at least 150mm beyond the damaged area on all sides, with the edges fully sealed by heat welding. For blistered felt, we cut open the blister, press the felt flat, dry any trapped moisture, and apply a reinforcing patch. If blistering is widespread, it indicates the felt has reached end of life and replacement is more cost-effective than multiple repairs. ### EPDM Rubber Roof Repairs EPDM repairs require specific materials — standard adhesives and sealants don't bond to rubber. We use EPDM-specific primers, adhesives, and uncured rubber flashing tape to create repairs that have a genuine chemical bond with the existing membrane. Common EPDM repair points include seam separations, punctures, and edge lifting. Where seams have failed, we strip the old seam tape, clean and prime the surface, and apply new bonding adhesive and seam tape with roller pressure. ### GRP Fibreglass Repairs GRP repairs involve sanding the damaged area back to sound laminate, applying a new layer of catalysed resin and glass fibre matting, and finishing with a pigmented topcoat. GRP repairs are structurally strong and chemically bond with the existing laminate, creating a repair that's as strong as the original. Common GRP repair points include cracks at stress points (direction changes, upstand bases) and areas where the original laminate was too thin. ### When Repair Isn't Enough We'll always tell you honestly if a repair isn't the right approach. If the flat roof membrane has multiple failure points, if the deck beneath is rotten, or if the roof has been patched repeatedly and is more patch than original — replacement becomes the more cost-effective option. Continuing to repair a roof that's past its useful life is like filling a bucket with holes. We'll explain the options, provide costs for both repair and replacement, and let you make an informed decision. Common Questions ## Frequently Asked Questions ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">How much does a flat roof repair cost? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">Can you fix my flat roof the same day? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">Will you repair any type of flat roof? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">How do I know if my flat roof needs repair or replacement? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">Do you guarantee flat roof repairs? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">Can ponding water on a flat roof be fixed? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">Is there a call-out charge? ### svg]:rotate-180 text-left text-foreground font-heading font-medium text-sm sm:text-base hover:no-underline" data-radix-collection-item="">What areas do you cover? ## Protect Your Property Today Speak to our team for honest advice and a no-obligation estimate. Most quotes delivered within 24 hours. Get Your Free Quote 07415 302 589 ### Related Services - Flat Roofs - Felt Roofs - Rubber Roofs - Emergency Roofers ### Areas We Serve IslingtonHackneyCamdenHampsteadFinsbury ParkArchwayHarringayMuswell Hill ← Home·All Services·Free Estimate·Our Work·Reviews Professional roofing services across North London. Quality workmanship, fair prices, guaranteed results. 07415 302 589 info@acroofingandcarpentry.co.uk 106 Dartmouth Park Hill, London N19 5HT FMB MemberTrustATrader - Roofing Services Flat Roof Installation - New Roof Installation - Roof Repairs London - Roof Replacement Service - Emergency Roof Repairs - Commercial Roofing London - Fascia & Soffit Replacement - Loft Conversion Roofing - Gutter Replacement - Flat Roof Repairs - Felt Roof Installation - Fibreglass Roof London - Rubber Roof Installation Areas We Cover - Roofer in Islington - Roofer in Hackney - Roofer in Camden - Roofer in Hampstead - Roofer in Finsbury Park - Roofer in Archway - Roofer in Harringay - Roofer in Westminster - Roofer in Muswell Hill - Roofer in Belsize Park - Roofer in Swiss Cottage Company - About AC Roofing - Customer Reviews - Roofing Portfolio - Roofing Blog - Current Offers - Get a Free EstimateGuides - Spot Roof Damage Early - New Roof Cost Guide 2026 - Flat vs Pitched RoofPrivacy PolicyTerms & ConditionsCookie Policy © 2026 AC Roofing And Carpentry Ltd. All rights reserved. Trusted roofers serving Islington, Hackney, Camden & all North London. Call NowFree Estimate We use essential cookies to run this site and optional analytics cookies to improve it. See our Cookie Policy. AcceptReject