Expert Flat Roof Repairs & Replacement Services

Expert flat roof repairs and replacements using modern, long-lasting materials including EPDM rubber, GRP fibreglass and high-performance felt systems. Trust our 20+ years of experience for reliable, weatherproof flat roofing solutions.

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Flat roofs require specialized knowledge and materials to ensure proper waterproofing and longevity. At Reasonable Roofing, we provide expert flat roof repairs and complete replacements using modern, high-performance materials designed specifically for flat and low-pitched roofing applications. Our 20+ years of experience ensures your flat roof will be professionally installed to provide reliable protection for years to come.

Modern flat roofing systems

Today's flat roofing systems offer significant improvements over traditional materials, providing better durability, longevity, and performance. We specialize in the installation and repair of these modern flat roofing solutions:

EPDM Rubber Roofing: A synthetic rubber membrane offering exceptional durability (30+ year lifespan), UV resistance, and flexibility in all weather conditions. EPDM is lightweight, requires minimal maintenance, and can be installed with few seams for excellent waterproofing.

GRP Fibreglass Roofing: A highly durable, seamless solution that effectively becomes a single solid piece when cured. GRP offers excellent water resistance, UV stability, and a typical lifespan of 25+ years with minimal maintenance requirements.

High-Performance Felt Systems: Modern torch-on felt systems are vastly superior to older felt roofing, offering reinforced layers, better flexibility, and improved resistance to weather, UV degradation, and physical damage.

PVC and TPO Single-Ply Membranes: Lightweight, flexible options that offer excellent weatherproofing and energy efficiency with reflective properties that can reduce cooling costs in summer.

Each system has specific advantages and applications. During our initial consultation, we'll assess your property's requirements and recommend the most appropriate solution for your specific needs and budget. For complete roofing system protection, we also offer guttering installation and repair services to ensure proper water drainage.

Expert flat roof repairs

Flat roofs are more susceptible to certain types of damage than pitched roofs, requiring specialized repair techniques. Our professional flat roof repair services address common issues including:

Localized Leaks and Water Ingress: We identify the precise source of leaks (which can be challenging with flat roofs) and provide targeted repairs to prevent water damage.

Blistering and Splitting: Addressing bubbles or cracks in the roofing membrane to prevent water infiltration and further deterioration.

Ponding Water: Fixing inadequate drainage that leads to standing water, which can accelerate roof deterioration and potentially cause structural issues.

Flashing and Edge Detail Failures: Repairing or replacing damaged flashing around roof penetrations, edges, and abutments to maintain water tightness.

Membrane Shrinkage or Detachment: Re-securing loose or shrinking membranes to ensure continuous weather protection.

Structural Issues: Addressing underlying structural problems that affect the roof's integrity.

We begin every repair with a thorough assessment to identify all issues, not just visible symptoms. This comprehensive approach ensures that we address the root causes of problems, not merely patch the effects. For properties with chimney stacks, we also offer chimney repair and pointing services to prevent water ingress at these critical junctions.

Complete flat roof replacements

When repairs are no longer cost-effective or your flat roof has reached the end of its serviceable life, we provide complete replacement solutions. Our flat roof replacement process includes:

1. Comprehensive Assessment: We thoroughly evaluate your existing roof's condition, the building structure, insulation requirements, and drainage patterns to design the optimal replacement solution.

2. Material Selection: Based on your budget, property requirements, and preferences, we'll recommend the most suitable modern flat roofing system from our range of high-performance options.

3. Professional Removal: Careful removal of the existing roof covering, with appropriate disposal and recycling of materials where possible.

4. Structural Repairs: Addressing any issues with the underlying deck or structure before installing the new roofing system.

5. Insulation Upgrades: Installing or upgrading insulation to improve energy efficiency and meet current building regulations.

6. Expert Installation: Precise installation of your chosen flat roofing system by our skilled specialists, following manufacturer guidelines and industry best practices.

7. Quality Finishing: Careful attention to all details including edges, joints, penetrations, and drainage to ensure a watertight, durable roof.

8. Final Inspection: Thorough quality checks before sign-off to verify the installation meets our high standards.

We understand that replacing a flat roof is a significant investment, which is why we focus on providing solutions that offer excellent longevity and value. For complete exterior protection, we also offer fascias and soffits installation to complement your new flat roof.

Maintaining your flat roof

Proper maintenance is essential for maximizing the lifespan of your flat roof. We recommend:

Regular Inspections: Bi-annual professional checks, particularly in spring and autumn, to identify and address minor issues before they become major problems.

Cleaning: Regular roof cleaning to remove debris that can block drainage and potentially damage the roofing membrane.

Drainage Maintenance: Keeping gutters, downpipes, and drainage outlets clear to prevent water pooling and potential leaks.

Prompt Repairs: Addressing any signs of damage immediately to prevent water ingress and more extensive deterioration.

Professional Maintenance Plans: Consider our scheduled maintenance programs for ongoing care and peace of mind.

With proper installation and regular maintenance, modern flat roofing systems provide reliable, long-term protection for your property. Our expertise in flat roof installation, repair, and maintenance ensures you receive a roofing solution that will perform excellently for decades.

Why Choose Reasonable Roofing?

With 20+ years of experience in flat roofing, our skilled specialists use high-quality materials and proven installation techniques to ensure your flat roof provides reliable, long-lasting protection for your property.

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Complete Roofing Solutions

For comprehensive property protection, we also offer guttering installation and repair services to ensure proper water management from your flat roof, preventing damage to your building's exterior.

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Protect Your Investment

Regular maintenance is essential for flat roofs. Our roof cleaning and maintenance services help extend the lifespan of your flat roof and prevent costly repairs.

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Call today for a free, no-obligation flat roof assessment and quote

07909 212751

Questions about flat roofs?

Frequently Asked Questions

Find answers to common questions about flat roof repairs and replacements, or contact us directly for personalized advice.

Signs that your flat roof may need repair include: visible cracks, blisters, or splits in the roofing membrane; water stains or damp patches on internal ceilings or walls; pooling water on the roof surface; deteriorated flashing around edges, penetrations, or abutments; debris build-up blocking drainage; visible membrane shrinkage or detachment at edges; and increased energy bills (potentially indicating damaged insulation). If you notice any of these signs, we recommend a professional inspection to assess the extent of the damage and determine the appropriate repair approach.

Yes, localized repairs are often possible and cost-effective when the damage is contained to a specific area and the remaining roof is in good condition. We can repair patches, seal leaks, and address isolated issues without full replacement. However, the feasibility depends on the roofing material, the extent of damage, and the overall condition and age of your roof. During our inspection, we'll provide honest advice on whether a partial repair is appropriate or if more extensive work would be more cost-effective in the long term.

Flat roof leaks can be challenging to locate because water may travel horizontally beneath the membrane before appearing inside your property. Our diagnostic process involves: thorough visual inspection of the entire roof surface; checking all seams, edges, and penetrations; examination of flashings and upstands; assessment of drainage points for blockages; and sometimes specialized techniques like moisture mapping or thermal imaging. In some cases, we may perform a controlled water test to track the water's path. Our experienced team has the expertise to accurately identify leak sources even in complex situations.

Repair costs vary widely depending on the extent of damage, accessibility, roofing material, and the specific work required. Minor repairs like patching small areas or resealing flashings might range from £150-£500, while more extensive repairs addressing larger areas could cost £500-£1,500 or more. We provide detailed, transparent quotations after thoroughly assessing your roof's condition. Our focus is on delivering cost-effective solutions that properly address the underlying issues, not just temporary fixes that may lead to further problems.

The duration of repairs depends on the scope of work, weather conditions, and specific materials used. Minor repairs typically take 1-2 days, while more extensive work might require 2-5 days or more. Some materials like GRP require specific temperature and weather conditions for proper curing. We'll provide a clear timeframe as part of your quotation and keep you informed throughout the process. Our team works efficiently while never compromising on quality, ensuring that repairs are completed properly the first time.

Consider replacement when: your roof is approaching or has exceeded its expected lifespan; you're experiencing frequent or multiple leaks; repairs would exceed 30-40% of replacement cost; there's extensive deterioration of the membrane; the underlying structure or insulation is damaged; ponding water cannot be resolved with repairs; or you want to improve energy efficiency with better insulation. We provide honest assessments to help you determine whether repair or replacement offers better long-term value, taking into account your roof's condition, age, and your future plans for the property.

For an average residential flat roof (garage, extension, or small property), replacement typically takes 2-5 days, depending on size, complexity, weather conditions, and the specific system being installed. Larger commercial projects or roofs with complex details will naturally take longer. The process includes removing existing materials, preparing the substrate, installing insulation and the new roofing system, and finishing details like edges and flashings. We'll provide a specific timeframe for your project during the quotation process and work efficiently to minimize disruption.

In some cases, an overlay system can be installed over an existing flat roof, which may save on removal costs and minimize disruption. However, this approach is only suitable when: the existing roof is in relatively good condition with no water-trapped insulation; the structure can support the additional weight; there are no underlying issues that need addressing; and the existing falls and drainage are adequate. We generally recommend complete removal to inspect and address any hidden issues, ensure proper preparation, and maximize the new roof's lifespan.

Flat roof replacement costs vary depending on size, accessibility, chosen materials, insulation requirements, and complexity. As a general guide, prices typically range from £80-£120 per square meter for high-performance felt systems, £100-£160 for EPDM, and £120-£180 for GRP fibreglass. For an average UK garage (15-20m²), costs might range from £1,500-£3,500 depending on the system chosen. Extensions and larger areas will cost proportionally more. We provide detailed, transparent quotations after assessing your specific requirements and roof characteristics.

In most cases, like-for-like flat roof replacements fall under permitted development and don't require planning permission. However, if you're making significant changes to the roof's appearance, height, or structure, or if your property is in a conservation area or is a listed building, you may need approval. Additionally, all work must comply with current building regulations, particularly regarding thermal performance. We can advise on the specific requirements for your project and help with any necessary documentation or compliance matters.

We recommend professional inspections at least twice a year, typically in spring (to address any winter damage) and autumn (to prepare for winter weather). Additional inspections are advisable after extreme weather events like severe storms. Regular inspections help identify minor issues before they develop into major problems, potentially saving significant repair costs. Our maintenance service includes thorough checks of the membrane condition, seams, flashings, drainage points, and adjacent building elements that might affect roof performance.

Between professional inspections, you can maintain your flat roof by: regularly removing leaves, branches, and debris (especially around drainage points); checking for and clearing blocked gutters and downpipes; visually inspecting (from a safe position) for obvious damage after storms; looking for interior signs of leaks like water stains; trimming overhanging branches that could damage the roof; and avoiding walking on the roof unnecessarily. If you notice any concerns, contact us promptly rather than attempting repairs yourself, as improper interventions can sometimes cause additional damage.

Yes, regular cleaning helps maintain your flat roof's performance and extend its lifespan. Debris accumulation can block drainage, leading to ponding water that accelerates deterioration. While moss and algae are less prevalent on modern flat roofing materials than on pitched roofs, they can still appear in shaded areas and should be professionally removed to prevent potential damage. Our roof cleaning service uses gentle methods appropriate for your specific roofing material to remove debris and biological growth without causing damage.

Converting a standard flat roof to usable outdoor space typically requires significant structural and design considerations beyond standard roofing. If you're interested in a roof terrace, this should be planned at the design stage to ensure adequate structural support, appropriate materials, safety features, and compliance with building regulations and planning requirements. For existing roofs, we can advise on the feasibility of conversion and recommend appropriate specialists for structural assessment. Some limited recreational use may be possible with certain roofing systems designed for foot traffic.

Yes, we offer comprehensive maintenance plans specifically designed for flat roofs. These typically include bi-annual inspections, cleaning of drainage points, minor repairs as needed, and detailed condition reports with recommendations. Regular professional maintenance is the most cost-effective approach to flat roof care, often extending lifespan by many years and preventing costly emergency repairs. Our maintenance plans can be tailored to your specific roof type and requirements, providing peace of mind that your roof is being professionally monitored and maintained.

Modern flat roofing systems

Expert flat roof repairs

Complete flat roof replacements

Maintaining your flat roof

Frequently Asked Questions

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Related Roofing Services

Guttering Replacement & Repairs

Downpipes Installation & Repairs

Fascias & Soffits