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Flat roofs require reliable, long-lasting protection. Among the available options, EPDM roofing has become one of the most widely used solutions for domestic extensions, garages, garden rooms, modular pods, and off-site constructed buildings across Ireland. If you are planning a flat roof, whether for a home improvement project or a factory-built modular structure, understanding EPDM’s capabilities, benefits, and applications will help ensure you select the right membrane system. QBM supplies EPDM membranes, trims and accessories nationwide, supporting roofing contractors, garden room manufacturers, and off-site construction companies with technical guidance and project-specific details. This article provides a comprehensive overview of EPDM roofing and why it has become a preferred choice in the Irish market. What Is EPDM? Understanding the Basics EPDM (Ethylene Propylene Diene Monomer) is a high-performance synthetic rubber membrane engineered specifically for flat and low-slope roofing. In simple terms, EPDM is a large, flexible rubber sheet that provides: Long-term waterproofing Excellent resistance to weathering Strong flexibility to accommodate building movement UV stability and a long service life Most EPDM used in Ireland is supplied in black, which helps absorb heat and speeds up drying after rainfall. Sheets are available in a range of widths, making it possible to cover many domestic roofs using a single, seamless piece. Thickness Options Common thicknesses in Ireland: Standard domestic use: approx. 1.1 mm Heavier-duty applications: 1.5 mm Thicker material increases puncture resistance and lifespan. QBM advises on the most appropriate thickness based on your roof’s expected use. Why EPDM Has Become a Leading Choice in Garden Rooms, Pods & Off-Site Construction In Ireland, EPDM is now one of the most favoured roofing products  in: Garden rooms Home offices Modular pods Off-site constructed units Portable and prefabricated buildings Why manufacturers prefer EPDM: Factory-Friendly Installation EPDM can be installed in a controlled factory environment, avoiding weather delays and improving quality assurance. Single-Piece Installation  Many garden rooms use a single EPDM sheet with no seams , reducing leak risk. Lightweight for Transport  Ideal for buildings transported by trailer or crane. Compatible With Common Off-Site Deck Materials  EPDM bonds well to OSB, plywood, SIP panels and other substrates. Low Maintenance for End Users  Clients purchasing garden rooms expect long-term performance with minimal upkeep, EPDM delivers this. Clean, Modern Appearance  Suits contemporary garden room designs and compact residential pods. QBM supplies EPDM systems directly to many Irish garden room and modular-building manufacturers, including adhesives, edge trims, outlets and detailing components. EPDM vs. Other Roofing Systems: How It Compares EPDM vs Bituminous Felt Felt systems  typically last 15–25 years. EPDM  frequently exceeds 25–40+ years. Felt installation requires hot works; EPDM uses cold-applied adhesives. EPDM offers cleaner, simpler repairs and is better suited for off-site manufacturing. EPDM vs GRP Fibreglass GRP gives a solid, rigid finish but is sensitive to movement and substrate imperfections. EPDM is more flexible and tolerant of building movement. EPDM installation is faster and more suitable for larger or factory-built roofs. GRP works best on small, simple roofs; EPDM performs better across broader applications. EPDM vs PVC Single-Ply QBM supplies both EPDM and PVC systems (FTT range). Broadly: EPDM Ideal for small/medium domestic roofs and pods Flexible, durable, minimal seams PVC Heat-welded seams Excellent for large commercial/inverted roofs Available in light colours for solar reflectance For extensions, garden rooms and off-site pod manufacturing, EPDM is typically the simplest and most efficient solution. Key Benefits of EPDM Roofing (for Homes, Garden Rooms & Pods) 1. Long Service Life EPDM routinely delivers 25–40+ years of reliable performance with basic maintenance. 2. Excellent Weather Resistance EPDM withstands: Heavy rainfall UV radiation Temperature movement Strong wind uplift This makes it ideal for Ireland’s climate. 3. Low Maintenance Only periodic inspections and basic cleaning are required. No regular recoating or specialist treatments. 4. Flexible Installation Methods EPDM can be: Fully adhered (most common for kits and pods) Mechanically fixed Ballasted (more common on commercial builds) 5. Easy to Repair Damage from tools, fallen branches or foot traffic can be repaired quickly using membrane patches. 6. Factory Installation Advantage For modular buildings, EPDM can be applied before delivery, ensuring instant watertightness on arrival. The EPDM Installation Process While QBM supplies the system and technical guidance, EPDM must be installed by a competent contractor or trained manufacturer. The process typically includes: 1. Deck Preparation Clean, dry, structurally sound substrate Over-boarding older bituminous roofs where required Removal of contaminants that prevent bonding 2. Membrane Positioning & Relaxation EPDM is unrolled and left to relax, reducing wrinkles and ensuring a precise fit. 3. Adhesive Application Water-based adhesive for main areas Contact adhesive for perimeters, corners and details 4. Trims, Flashings & Outlets QBM supplies: Aluminium and uPVC edge trims Internal/external corners Pipe and vent flashings Roof outlets and drainage components Correct detailing is essential; most leaks occur at edges or penetrations rather than the membrane itself. Maintaining an EPDM Roof Routine Checks (twice yearly recommended) Clear outlets and gutters Inspect perimeters and details Look for punctures or unusual wear Check for standing water around outlets Cleaning Use a soft brush and EPDM-safe cleaning products. Avoid solvents and aggressive pressure washing. Typical Issues Wrinkling due to inadequate adhesion Blisters from trapped moisture Punctures from sharp objects Most issues are minor and easily resolved with EPDM patch materials. Is EPDM Right for Your Project? EPDM is an excellent choice for: Extensions and home renovations Garden rooms, home offices and studios Modular pods and prefabricated buildings Garages and workshops Simple low-slope roofs Factory-built/off-site construction where reliability and speed matter Projects requiring minimal maintenance Alternative systems may be more suitable where: Heavy foot traffic is expected (terraces/decks) A rigid decorative finish is desired (GRP) Light-coloured solar-reflective membranes are specified (PVC) QBM can advise your architect, roofer or manufacturer on the correct system for your project. Frequently Asked Questions Can EPDM be installed over an existing roof? Yes, in many cases, provided the deck is sound, dry and suitable for over-boarding. Bitumen roofs typically require new OSB/plywood or insulation with a glass tissue facing before EPDM is bonded. How long does EPDM last in Ireland? With proper installation, 25–40+ years  is typical. EPDM has been used globally since the 1960s with an excellent performance record. Is EPDM suitable for garden rooms and pods? Yes. EPDM is one of the most widely used roofing membranes  in Ireland’s garden room and modular pod market due to its single-piece installation, flexibility and long lifespan. Can homeowners install EPDM themselves? Small, simple roofs may be suitable for competent DIY installation using QBM EPDM kits. However, for valuable properties or complex roofs, QBM strongly recommends professional installation. Does EPDM require special maintenance products? Only EPDM-compatible cleaners and primers for repairs. Avoid petrol-based or solvent-heavy cleaners. Making Your EPDM Decision EPDM provides a highly reliable, low-maintenance and cost-effective solution for flat roofs in Ireland. Its exceptional suitability for garden rooms, pods and off-site manufactured buildings  has made it one of the most popular membranes in the country. QBM supports homeowners, architects, roofing contractors and modular-building manufacturers by supplying: Quality EPDM membranes Adhesives and accessories Trims and outlets Project-specific technical guidance Build-up recommendations (warm roof, cold roof, over-boarding) If you are considering EPDM for your home extension, garden room, pod or modular unit, QBM can work with your contractor or design professional to ensure the correct system is specified—providing decades of weatherproof protection. Flat roofs need reliable, long-lasting protection. EPDM roofing has become one of the most popular solutions for extensions, garages, and commercial buildings across Ireland. Perhaps you've heard the term mentioned but aren't quite sure what it means or whether it's right for your property. At QBM, we've installed EPDM systems on countless Irish buildings over the years. The material offers impressive durability, straightforward installation, and decades of weather protection. But like any roofing option, it has specific characteristics worth understanding before making a decision. Let's explore what EPDM actually is, how it performs, and whether it might suit your flat roofing needs.

In recent years, flat roof design has come under increased scrutiny, particularly around fire safety, durability, and long-term performance. Against that backdrop, BS 6229 was revised in 2025 , introducing clearer expectations around how flat roofs should be designed, specified, and delivered. A common question from Irish design teams is:  Why does a British Standard still matter in Ireland, especially post-Brexit?  And just as importantly: what has actually changed in the 2025 revision? This article addresses both. Why BS 6229 is still relevant in Ireland First, it is important to be clear about what BS 6229 is — and what it is not. BS 6229 is not legislation, and it has never been mandatory in Ireland. Instead, it is a code of practice that sets out recognised good practice for the design and construction of flat roofs. Irish Building Regulations, including TGD B (Fire Safety), rely heavily on European harmonised standards, such as EN 13501-5 for external fire performance of roofs. BS 6229 does not replace those standards; rather, it explains how they should be applied in real roof systems, including drainage, insulation, fire performance, interfaces, and maintenance. In practice, Irish fire engineers and specifiers continue to reference BS documents where there is no equivalent Irish code of practice, particularly where system design and responsibility need to be clearly defined. Brexit did not change this technical reality. As a result, BS 6229 remains a widely recognised reference point in Irish projects, especially for apartments, mixed-use developments, balconies, podiums, and roofs with multiple functions. What has changed in BS 6229:2025? The 2025 revision does not radically reinvent flat roof design, but it does tighten expectations and reflect modern construction risks. The key updates fall into six main areas. 1. Stronger emphasis on drainage and falls BS 6229:2025 reinforces the requirement for effective drainage, with a minimum finished fall of 1:80. The update places more responsibility on the design team to ensure that structural decks are suitable before roofing works commence, rather than relying on the waterproofing contractor to resolve poor falls on site. This is particularly relevant on concrete decks, refurbishment projects, and roofs with attenuation or blue-roof functions, where standing water can have both performance and fire implications. 2. Enhanced thermal performance guidance The revised Standard places greater emphasis on insulation performance, particularly for inverted warm roofs and blue roofs , where retained water can affect thermal efficiency. Designers are now expected to apply appropriate calculation methods to confirm that insulation thickness remains adequate under operational conditions, not just in dry scenarios. This reflects the increasing use of roofs as part of sustainable drainage strategies. 3. Clearer fire safety expectations Fire performance is one of the most significant areas of change. BS 6229:2025 reinforces that fire performance must be considered at roof-system level, not simply by referencing a membrane or surface finish in isolation. Where roofs serve multiple purposes — for example as terraces, escape routes, or amenity spaces — designers must ensure that both external and internal fire performance requirements are addressed. The Standard also makes it clear that fire performance depends on the complete build-up, including deck type, insulation, fixing method, and whether the waterproofing layer is exposed or protected. 4. Recognition of “multi-functional finishes” A notable update is the formal introduction of terms such as “multi-functional finishes”. This captures podium decks, roof terraces, play areas, and landscaped roofs - all of which introduce additional loads, interfaces, and fire considerations. The Standard now explicitly recognises that these roofs require robust waterproofing, protection layers, and careful coordination with the overall fire strategy. This is particularly relevant in the Irish market, where podium and balcony roofs are increasingly common in residential developments. 5. Greater focus on workmanship and maintenance BS 6229:2025 strengthens guidance on workmanship, sequencing, and inspection. Examples include: avoiding leaving insulation exposed overnight, inspecting each layer before covering, and ensuring comprehensive handover documentation. The Standard also recommends regular inspection and maintenance, typically at least twice per year, reinforcing the idea that roof performance is a lifecycle issue, not just a construction-stage concern. 6. Condensation risk and acoustic performance The updated Standard requires a project-specific condensation risk analysis for each roof build-up, rather than relying on generic assumptions. This is especially important in buildings with high internal humidity, such as sports facilities or swimming pools. There is also expanded guidance on sound attenuation, recognising that roofs increasingly play a role in overall acoustic performance, particularly in urban environments. What this means for Irish building designers The most important takeaway is that BS 6229:2025 pushes the industry toward clearer, system-based thinking. For designers, this means: roofs should be described and coordinated as complete systems, fire performance should be considered in context, not assumed, interfaces with façades, parapets, and terraces need early attention, and responsibility boundaries should be clearly defined within the design team. None of this contradicts Irish Building Regulations. Instead, it supports them by providing a practical framework for applying European standards in real projects. A shift toward clarity, not complexity BS 6229:2025 does not impose new legal obligations in Ireland. What it does do is reflect the way flat roofs are now being assessed by fire engineers, building control authorities, and insurers. For building designers, understanding its intent helps: reduce late-stage design changes, avoid ambiguity at tender stage, and deliver roofs that perform as intended over their full service life. As flat roofs continue to evolve into multi-functional building elements, the principles set out in BS 6229:2025 provide a useful reference point for good practice — regardless of jurisdiction.

Energy prices continue to rise, and most homeowners in Ireland are now looking for real, long-term ways to reduce heat loss rather than quick fixes. Your roof is critical in this equation. A poorly designed flat roof can leak heat all winter; a well-designed system can significantly cut energy consumption and improve comfort. At QBM, we do not supply tiles or metal sheets for pitched roofs. Instead, we specialise in flat roofing systems – bituminous membranes, PVC single-ply, EPDM kits, and green/blue roof build-ups – along with the technical support needed to design them correctly. For Irish homes, extensions, garden rooms and pods, the question is not “which material is magic”, but: What flat roof build-up gives the best energy performance for this specific project? This guide explains: What “energy-efficient roofing” actually means in Ireland, The difference between warm roofs, inverted roofs and cold roofs, How QBM’s systems (bituminous, PVC, EPDM and green roofs) perform, and How to choose an efficient solution for your home or off-site build. Understanding Roof Energy Efficiency in the Irish Context When we talk about energy efficiency in roofs for Irish homes, we are mainly dealing with: Heat loss in winter – minimising heat escaping through the roof. Condensation control – avoiding moisture problems that reduce performance. Comfort and stability – avoiding cold ceilings, draughts and temperature swings. The key technical factors are: U-value (overall thermal transmittance) How much heat is lost through the complete roof build-up. Lower U-value = better insulation = less heat loss. This is what Irish Building Regulations (Part L) are primarily concerned with. Continuity of insulation / thermal bridging Gaps in insulation at upstands, perimeters, joists and rooflights can undermine the whole roof. A well-designed flat roof system reduces these cold bridges. Airtightness Warm air leaking up into the roof can cause heat loss and condensation. Good detailing at junctions and penetrations is essential. Surface colour and solar gain For flat roofs in Ireland, colour and reflectance matter, but they are secondary to insulation and airtightness. Cooling loads are modest compared to warmer climates. With flat roofs, the membrane is only part of the picture. The real efficiency comes from the overall build-up: insulation type, position, thickness and detailing. The Most Efficient Approach: Warm Flat Roof Systems For most Irish homes and extensions, the most energy-efficient flat roof solution is a properly designed warm roof, regardless of whether the membrane is bituminous, PVC or EPDM. What is a warm flat roof? In a warm roof: The structural deck (e.g. timber, concrete, OSB) sits at the bottom, A vapour control layer (VCL) is placed on the warm side, Rigid insulation (e.g. PIR, mineral wool or similar) is installed above the deck, The waterproofing membrane (bituminous, PVC or EPDM) is installed on top. This keeps the structure warm, minimises condensation risk, and allows a continuous layer of insulation above the deck – exactly what you want for energy efficiency. Why warm roofs are efficient Continuity of insulation with fewer cold bridges Better control of interstitial condensation Simplified detailing compared to ventilated cold roofs Easier to upgrade insulation thickness to meet or exceed current Part L targets QBM regularly supports architects and contractors in designing warm roof build-ups using:  General Membrane bituminous systems, FDT PVC single-ply membranes, and EPDM membranes for domestic extensions and garden rooms. Inverted Roofs & Roof Terraces: Efficiency with Protection Where roofs are used as terraces, balconies, or support paving/ballast, an inverted roof is often the most efficient and durable solution. What is an inverted roof? In an inverted roof: The waterproofing membrane (bituminous or PVC) sits directly on the structural deck, Insulation is placed on top of the membrane, A ballast layer, paving or green roof build-up sits above the insulation. Benefits: Membrane is protected from UV, thermal cycling and mechanical damage Long-term durability and stable thermal performance Ideal for terraces, podium decks, and roofs with finishes above In terms of energy efficiency, inverted systems perform very well once the correct insulation type and thickness are selected. They are particularly suitable where a usable outdoor surface is required above the roof. EPDM Warm Roofs for Extensions, Garden Rooms & Pods For smaller domestic flat roofs, garden rooms, pods and off-site construction, EPDM warm roofs have become one of the most popular solutions in Ireland. Why EPDM warm roofs are efficient in this sector: Continuous insulation above the deck using warm roof build-ups Single-piece EPDM membranes on many small roofs, minimising joints Cold-applied installation, avoiding thermal risk during works Compatible with factory-built/off-site units where insulation and membrane can be applied under controlled conditions For garden rooms and pods, manufacturers often: Build the roof cassette in the factory, Install insulation and EPDM, Deliver a pre-finished, fully insulated, watertight unit to site. This ensures consistent quality and tight air and thermal performance, which is a major advantage in off-site construction. Bituminous Warm Roof Systems (General Membrane) On larger domestic roofs and extensions and often chosen for larger flat roofs, apartment blocks, terraces and green/blue roof projects. Multi-layer bituminous warm roof systems remain a staple and can be extremely energy efficient when designed correctly. Key points: Warm roof build-ups with consistent insulation thickness Robust, multi-layer waterproofing with good thermal stability Excellent for complex detailing, upstands and parapets Suitable for both domestic and commercial settings From an energy perspective, bituminous systems perform comparably to other membranes when the insulation and detailing are correct. The membrane choice is driven more by use, detailing and durability than by U-value. PVC Single-Ply Warm & Inverted Roofs (FDT) PVC single-ply systems are also often chosen for larger flat roofs, apartment blocks and terraces projects. Efficiency-related advantages: Warm and inverted build-ups with high-performance insulation Light-coloured membranes available, which can reduce surface temperatures in summer Clean, welded seams with minimal thermal weak points Very compatible with green roofs and blue roofs, where the membrane is fully protected Again, the primary energy gain is from the insulation layer and continuity, with membrane colour and reflectivity as a secondary consideration. Green Roofs: Thermal Mass, Insulation & Comfort Green roofs are not just about biodiversity and aesthetics. When installed over a proper warm or inverted roof build-up, they also contribute to overall energy performance. Energy-related benefits: Thermal mass moderates temperature swings Additional protection for the membrane extends its life Potential improvements in summer comfort by reducing heat gain Some winter benefit through reduced heat loss and wind exposure over the roof surface For Irish homes and extensions, a green roof is rarely chosen solely  for energy efficiency, but it forms part of a highly efficient roof build-up when combined with a well-insulated QBM flat roof system. What About “Cold” Flat Roofs? Traditional cold flat roofs place insulation between joists, with a ventilated void above and the deck/membrane on top. From an energy and moisture perspective, cold roofs have drawbacks: Difficult to ventilate properly in real-world conditions Higher risk of condensation if detailing is not perfect Insulation is interrupted by timber joists (thermal bridges) Harder to achieve low U-values with continuity For these reasons, QBM generally recommends warm or inverted roofs for new build and refurbishment where energy efficiency is a priority. Cold roofs are typically reserved for specific refurbishment scenarios where changing the build-up is not practical. Comparing Energy Efficiency of Flat Roof Approaches Below is a simplified comparison focused on flat roofs and systems QBM support: Roof System Energy Efficiency Potential Typical Use Notes Warm Roof (Bituminous) Excellent Extensions, houses, and commercial roofs Very strong when well detailed, robust and proven Warm Roof (PVC Single-Ply) Excellent Larger roofs, apartments, terraces Light-coloured options; good for complex detailing Warm Roof (EPDM) Very Good–Excellent Extensions, garden rooms, pods, off-site units Ideal for factory-built and small domestic roofs Inverted Roof (Bituminous/PVC) Excellent Terraces, balconies, podiums, green/blue roofs Membrane protected; strong long-term performance Green Roof over Warm/Inverted Roof Very Good–Excellent Eco-focused projects, urban roofs, amenity spaces Gains from thermal mass and surface protection Traditional Cold Flat Roof Fair–Good Legacy roofs, limited refurbishment scenarios Higher condensation risk, more thermal bridging The key takeaway: The most efficient “roofing system” is a well-designed warm or inverted flat roof with continuous insulation and good detailing – not a specific membrane brand. Other Factors That Influence Roof Efficiency Beyond the choice of membrane and build-up: Insulation Thickness and Type Meeting or exceeding current U-value requirements has a direct impact on energy bills. Many older flat roofs in Ireland are under-insulated compared to today’s standards. Detailing at Junctions Upstands, parapets, rooflights and penetrations must be carefully detailed to avoid thermal bridges and air leakage. Airtightness A well-insulated roof still performs badly if warm air leaks into the structure. Airtightness layers and careful sealing at junctions are essential. Colour and Reflectivity On flat roofs in Ireland, the effect of membrane colour on energy use is modest compared to insulation. However, light-coloured membranes (often PVC) can reduce surface temperatures during warm spells and improve comfort in highly glazed or lightweight structures. Frequently Asked Questions What is the most energy-efficient flat roof system for a typical Irish extension? For most standard extensions, the best option is usually a warm flat roof with: Adequate rigid insulation above the deck, A vapour control layer on the warm side, A suitable membrane (bituminous, PVC or EPDM) selected based on use and detailing. The exact membrane is less important than getting the build-up, U-value and detailing right. QBM can provide project-specific warm roof specifications for your designer or contractor. Is EPDM efficient enough for garden rooms and pods? Yes. For garden rooms, pods and off-site construction, a warm roof with EPDM is often the most practical and efficient solution: Good insulation continuity in the factory-built cassette Long-term durability of the membrane Minimal maintenance for end users This is why EPDM is now a preferred choice in the Irish garden room and modular pod market. Does adding a green roof make my flat roof more energy efficient? A green roof on top of a correctly designed warm or inverted roof can: Improve thermal stability, Provide some additional thermal resistance, Protect the membrane and extend its life. However, you should still design the underlying flat roof to meet energy targets without relying on the green roof layer. Think of the green roof as a valuable enhancement, not the primary insulation. Can I just add insulation internally and leave the flat roof as it is? Internal insulation can help, but: It may introduce condensation risks if not coordinated with the existing roof build-up and vapour control layers. It does not address thermal bridges at joists and edges. In many cases, upgrading to a warm roof from above is a more robust, energy-efficient and durable solution. QBM can help your design team evaluate options. Are there grants in Ireland that relate to roof efficiency? Most support schemes focus on insulation and overall building performance rather than specific membranes. Upgrading roof insulation as part of a flat roof refurbishment often forms part of a broader energy upgrade. Your energy assessor or contractor can advise on current SEAI schemes and how a roof upgrade might fit into a wider retrofit plan. Moving Forward: Choosing an Efficient Flat Roof System with QBM The “most efficient roofing system” for Irish homes is not a single product, but a properly designed flat roof build-up that: Achieves a low U-value, Controls condensation, Minimises thermal bridging, and Uses a membrane suited to the building’s use and detailing. QBM’s role is to: Supply bituminous, PVC and EPDM flat roofing systems, Provide technical support and specifications for warm, inverted and green roof build-ups, Assist architects, engineers, contractors, garden room and pod manufacturers in selecting and detailing the most appropriate system. If you are planning a flat roof on a new extension, garden room, modular pod or refurbishment project, QBM can support your design team in creating a roof that is not only watertight and durable, but genuinely energy efficient in Irish conditions. The right efficient roofing system doesn't just reduce energy bills. It creates a more comfortable home, reduces environmental impact, and adds value to your property. That's worth getting right.

Choosing the right roof for your home is not just about appearances. It is about protection, longevity, compliance with regulations, and overall value. For many Irish homeowners, the key decisions are now happening on flat and low-slope roofs – extensions, dormers, balconies, garages and terraces – rather than on traditional pitched roofs. At QBM, we specialise in flat roofing systems and accessories supplied to professional roofing contractors and design teams across Ireland. We do not sell tiles or asphalt shingles; instead, we focus on robust, modern flat roof membranes that perform in Ireland’s wet, windy climate and meet current fire and thermal requirements. If you are planning a new extension, upgrading an existing flat roof, or considering a green or blue roof, understanding your options will make the process far less daunting. This guide explains the main flat roofing systems QBM supply, where each is typically used, and which might best suit your project. Flat Roofing with QBM: What We Actually Supply Rather than every roofing product on the market, QBM focuses on a set of proven systems: Bituminous torch-on membrane systems (multi-layer “felt” systems from our General Membrane range) PVC single-ply membrane systems (from our FDT range) EPDM rubber roofing kits for domestic extensions, sheds and garages Associated insulation build-ups (warm and inverted roofs) Green and blue roof build-ups using our flat roof membranes as the waterproofing layer Aluminium edge trims and metalwork to finish and protect flat roof edges and details The sections below walk through each of these in more detail. Bituminous Torch-On Membrane Systems Bituminous membranes – often referred to as “felt roofs” – remain a core solution for flat roofs in Ireland, especially for warm roof build-ups on extensions and refurbishments. QBM supplies high-performance, multi-layer bituminous systems from our General Membrane range, typically comprising: A vapour control layer A base/intermediate layer A mineral or cap sheet as the final waterproofing layer Key advantages Proven performance in Ireland’s wet climate Multi-layer build-up offers strong redundancy and robustness Suitable for warm roof, cold roof and overlay refurbishment systems Wide range of finishes and mineral colours Excellent compatibility with traditional detailing methods Typical applications House and kitchen extensions Refurbishment of existing felt roofs Apartment blocks and communal walkways Roofs where a robust, foot-traffic-resistant finish is required Considerations Installation is normally by gas torch and must be carried out by experienced roofing contractors Correct design of insulation and vapour control is critical to avoid condensation Weight is higher than single-ply systems, so structure should be checked on refurb projects QBM can assist your architect or contractor in selecting the correct Bitumenman system to meet thermal, fire and durability requirements. Metal Roofing: Long-Term Performance Metal roofing has come a long way from the agricultural buildings and industrial units where it originated. Modern metal roofs offer homeowners impressive durability that can stretch 50 years or more with minimal fuss. The material itself resists fire, doesn't rot, and handles wind exceptionally well. This makes metal roofing particularly attractive for exposed properties or coastal homes where salt air can accelerate deterioration in other materials. Benefits worth noting: Exceptional lifespan (40-70 years typical) Lightweight compared to tile systems Energy-efficient with reflective coatings Low maintenance requirements Recyclable at the end of life Metal roofs come in several materials. Steel provides strength and affordability. Aluminium resists corrosion better, which helps in coastal regions. Copper and zinc offer distinctive appearances that develop attractive patinas over time, though they cost considerably more. Installation costs run higher than asphalt shingles initially. But when you factor in longevity and reduced maintenance, the numbers often balance out. Some homeowners worry about noise during rainfall, though proper insulation typically addresses this concern. PVC Single-Ply Membrane Systems (FDT) PVC single-ply membranes provide a lightweight, modern alternative to multi-layer bituminous systems. QBM supplies FDT PVC membranes that are widely used on both domestic and commercial projects. These systems typically consist of a single waterproof membrane that is: Mechanically fixed, Adhered, or Ballasted (for inverted roofs, green roofs or terrace finishes). Key advantages Lightweight – ideal where structural capacity is limited Fast installation and clean detailing Heat-welded seams create durable, watertight joints Well-suited to complex details such as upstands, rooflights and parapets Often selected as the waterproofing layer beneath green and blue roofs Typical applications New build extensions and flat roof areas Apartment and commercial roofs Inverted roofs with paving, ballast or decking Green and blue roof systems where consistent water-tightness is essential Considerations Must be installed by trained PVC single-ply contractors with the correct welding equipment Requires appropriate substrate preparation and fixings or adhesives Needs to be correctly detailed at junctions, penetrations and perimeters QBM’s technical team can help design a complete FTT system, including fixings, vapour control, insulation, and edge details. Elevate EPDM Rubber Roofing Kits For smaller domestic projects – such as single-storey extensions, sheds, home offices and garages – EPDM rubber offers a straightforward, cost-effective solution. QBM supplies EPDM roofing kits that typically include: A single-piece EPDM membrane cut to size Appropriate adhesives (water-based and/or bonding adhesive) Pre-formed corners and accessories where required Aluminium or GRP edge trims to provide a neat, secure finish Key advantages Simple, quick installation for competent roofing contractors Fewer seams: many small roofs can be done in a single sheet Good resistance to UV and weathering Lightweight with minimal impact on structure Ideal for domestic-scale flat roofs Typical applications Kitchen or living room extensions Garden rooms, sheds and home offices Garage roofs Replacement of ageing felt on small domestic roofs Considerations Substrate must be smooth and properly prepared Detailing around penetrations and rooflights requires care Dark colour absorbs heat, so correct insulation build-up is important Our EPDM kits are designed to make specification and ordering simple, while ensuring all required trims and adhesives are included. Warm Roof and Inverted Roof Build-Ups Beyond the waterproofing layer itself, how your flat roof is insulated and built up has a major impact on performance. QBM provides guidance and specifications for: Warm Roof Systems Insulation above the structural deck Vapour control layer on the warm side of insulation Waterproofing membrane on top (General Membrane Bitumen, FDT PVC or Elevate EPDM, depending on system) Benefits: Reduces risk of condensation when correctly designed Improves thermal performance and energy efficiency Keeps the structure warm, reducing thermal stress Inverted Roof Systems Waterproofing membrane directly on the structural deck Rigid insulation laid on top of the membrane Ballast, paving, decking or green roof build-up above Benefits: Membrane is protected from UV and mechanical damage Ideal for roof terraces, balconies and green/blue roofs QBM can supply the waterproofing and associated details, and work with your design team to ensure that the overall build-up meets current Irish Building Regulations. Green & Blue Roof Systems Green and blue roofs are increasingly popular in Irish urban areas, and QBM’s membranes are often used as the waterproofing layer beneath these systems. Green roofs Vegetation layer (sedum, wildflower or intensive planting) Growing medium and filter layer Drainage and protection layers Waterproofing membrane (General Membrane Bitumen, FDT PVC or Elevate EPDM) beneath Blue roofs Designed to temporarily store rainfall on the roof Controlled outlets regulate the release of water to the drainage system Often combined with a green roof build-up Key advantages: Manage stormwater and reduce pressure on urban drainage Enhance biodiversity and visual amenity Improve thermal and acoustic performance Can contribute to planning compliance on certain developments Because the waterproofing layer is buried beneath soil, ballast and drainage layers, reliability is critical. QBM works with designers and contractors to choose the right membrane system, protection layers, and edge details for these roofs. Choosing the Right System for Your Home Below is a simplified comparison of the main flat roof systems QBM supply for domestic projects. Actual performance and cost will depend on the specific build-up and project details. Roofing System Typical Lifespan (when properly installed) Climate Suitability (Ireland) Maintenance Level Typical Initial Cost* Bituminous Torch-On 20–30+ years Excellent Medium Low–Medium PVC Single-Ply (FTT) 25–30+ years Excellent Low–Medium Medium EPDM Rubber (QBM Kits) 20–30 years Very Good Medium Low–Medium Warm Roof Build-Up As per membrane Excellent Medium Medium Inverted Roof Build-Up As per membrane Excellent Low–Medium Medium -High Green / Blue Roof (over QBM membranes) Depends on system; membrane protected Very Good Higher (for planting) High (due to full build-up) *Indicative relative cost only – excludes structural work and is subject to project-specific design. Think about your plans too. If you're staying long-term, premium options make more sense. Shorter timelines might favour cost-effective solutions. Energy efficiency considerations can influence the decision, particularly with rising heating costs. Choosing the Right System for Your Home The “best” flat roofing system for your project depends on several factors: Use of the roof Simple weatherproof cover (e.g. over a utility room) Terrace, balcony or accessible roof area Green or blue roof Structure and loading Existing deck material and condition Available structural capacity for ballast, planting or paving Thermal requirements Warm roof vs inverted roof Target U-values for Building Regulations compliance Budget and programme Upfront cost vs long-term durability Speed of installation and coordination with other trades QBM does not install roofs, but we work closely with architects, engineers and roofing contractors to select the most appropriate system and provide project-specific specifications. Installation and Maintenance Matters Even the best roofing material performs poorly with substandard installation. Professional installation isn't optional; it's essential. Proper techniques ensure waterproofing, structural integrity, and warranty validity. Regular maintenance extends any roof's lifespan. Annual inspections catch small issues before they escalate. Clear gutters and drains prevent water backup. Replace damaged components promptly. At QBM, we emphasise proper installation and ongoing care. A roof is your home's primary defence against Ireland's weather. Investing in quality materials and professional workmanship pays dividends over decades. Frequently Asked Questions What roofing system performs best in Ireland's wet climate? All of QBM’s core systems – General Membrane bituminous systemss, FDT PVC single-ply and Elevate EPDM rubber – are designed to perform in wet, windy conditions when installed correctly. Bituminous torch-on systems  offer robust, multi-layer protection and have a long track record in Ireland. PVC single-ply  systems provide heat-welded seams and are often preferred for modern builds, inverted roofs and green/blue roof projects. EPDM  works very well on smaller domestic roofs where simplicity and speed of installation are priorities. The key is selecting the right build-up (warm or inverted) and ensuring proper detailing and drainage. How much does it typically cost to replace a roof in Ireland? Costs vary depending on: Roof size and complexity Choice of membrane (bituminous, PVC or EPDM) Insulation type and thickness Access, safety and detailing requirements As a broad guide for supply and installation by a professional contractor: EPDM on small domestic roofs: typically at the lower end of the cost scale Bituminous multi-layer systems: low–medium cost with robust performance PVC single-ply: medium cost, particularly for larger or more complex roofs Green/blue roofs and inverted terraces: higher cost due to extra layers, insulation, finishes and detailing QBM can provide material budgets and support your contractor in pricing a QBM-specified build-up, but final installed cost will always come from your chosen roofing contractor. Flat roofing systems typically run upwards from €120 per square metre, depending on membrane type and insulation thickness. Remember that cheaper options often require replacement sooner, making premium materials more economical long-term. Always obtain multiple quotes from reputable contractors and verify their credentials before proceeding. Can I install solar panels on any type of roofing system? Yes, Most roofing systems can accommodate solar panels with proper mounting hardware, though some work better than others. Metal roofing offers ideal conditions; panels attach easily without penetrating the roof surface. All PV installations require careful mounting to prevent leaks. Flat roofs work well for solar arrays, particularly Bitumen and PVC systems. For green and blue roofs, loading, drainage and waterproofing protection layers must be carefully coordinated. The key is working with experienced installers who understand both roofing and solar requirements to ensure waterproof integrity remains intact. How often should I have my roof inspected professionally? Bi-annual inspections represent the minimum recommendation for all roofing systems. Schedule checks in autumn before winter weather arrives, allowing time to address any issues discovered. Increase inspection frequency after severe storms, particularly high winds or hail events. Flat roofs and those with complex designs may require more frequent attention due to drainage considerations. Professional inspections identify problems early when repairs cost less and prevent interior damage. Keep records of all inspections and maintenance work performed. Do QBM deal directly with homeowners? QBM primarily supplies products and technical support to: Roofing contractors Architects and design teams Developers and main contractors However, if you are a homeowner planning a project, we can: Help your architect, engineer or contractor select an appropriate QBM system Provide NBS-style specifications, technical data sheets and typical details Recommend QBM-approved systems that local contractors can install How do I know which QBM system is right for my project? Start with the basics: What is the roof being used for (simple cover, terrace, green roof, etc.)? Is it a new build or refurbishment? What are the structural and thermal requirements? What is your budget and timescale? Once those are clear, QBM can work with your design team to propose: A suitable membrane system The correct build-up (warm or inverted) Edge, upstand and drainage details Any additional components such as aluminium trims and accessories Making Your Decision Selecting a flat roofing system is a significant investment in your home’s future. The right QBM system, correctly designed and installed by professional contractors, can deliver decades of reliable performance in Ireland’s demanding climate. QBM’s role is to supply proven flat roofing products and provide technical support – from early design and specification through to on-site queries. Whether you are planning a simple extension or a complex roof with terraces, green roofs or blue roof attenuation, we can help your project team choose and detail the most appropriate solution. If you or your design team would like project-specific guidance or specifications for a flat roof in Ireland, QBM’s technical department is available to assist.