Thermal Insulation Supplies
We pride our selves on our commitment to quality, service and of course price. We have partnered with the Industries Leading Manufacturers to provide a complete design and supply service to the roofing industry for both new build and refurbishment projects. We provide comprehensive warranties with all our Flat roofing systems and guarantee that you will not find higher quality roofing material at such competitive prices.
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Maximise Energy Efficiency with Ireland's Premier Flat Roof Insulation Supplier
Meeting Ireland's increasingly stringent Building Regulations thermal performance requirements demands proper insulation specification, yet many roofing projects still fail to achieve target U-values due to inadequate material selection or thermal bridging at critical details.
QBM supplies the complete range of flat roof insulation products needed to meet Part L compliance whilst ensuring compatibility with your chosen waterproofing system. Our comprehensive stock includes ROCKWOOL stone wool boards for superior fire performance and acoustic benefits, PIR (polyisocyanurete) insulation for maximum thermal efficiency in minimal thickness, and specialist cover boards that protect insulation layers from mechanical damage during installation and throughout the roof's service life.
Whether you're working on new build projects targeting passive house standards or refurbishment works upgrading dated flat roofs to current thermal regulations, we supply the technical solutions and expert guidance that ensure your insulation specification delivers as designed.
The thermal performance of flat roof assemblies depends not only on insulation material selection but on proper system design that addresses vapour control, thermal bridging at penetrations and upstands, and compatibility between insulation products and waterproofing membranes.
QBM's technical team understands these interdependencies and can recommend complete system packages that optimise thermal performance whilst maintaining long-term durability. Our ROCKWOOL HARDROCK Multi-Fix dual-density boards provide exceptional compressive strength for mechanically fastened single ply systems, whilst maintaining the fire safety and acoustic properties that make stone wool insulation the preferred choice for many commercial applications.
For projects requiring slim build-ups, our high-performance PIR boards deliver lambda values as low as 0.022 W/mK, enabling compliance with demanding U-value targets without excessive roof build-up that impacts drainage falls or ceiling heights.
Material compatibility represents a critical consideration often overlooked during specification, leading to premature system failures that void warranties and generate costly remedial works. Different waterproofing systems impose specific requirements on insulation substrates, from surface hardness and dimensional stability through to compatibility with adhesives or resistance to elevated temperatures during torch application. QBM supplies insulation products that carry manufacturer approvals for use with major waterproofing systems, providing contractors and specifiers with confidence that material combinations meet both performance targets and warranty requirements.
Our Elevate Isogard HD cover boards exemplify this system's approach, offering high-density protection that's specifically engineered to work with EPDM, PVC, and liquid waterproofing membranes, whilst providing the surface hardness needed for foot traffic during and after installation.
Rising energy costs and Ireland's climate action commitments mean thermal performance specifications will only become more demanding in the coming years. Forward-thinking developers and building owners increasingly target thermal performance well beyond minimum Building Regulations compliance, recognising that enhanced insulation delivers tangible returns through reduced heating and cooling costs over the building's lifetime.
QBM maintains comprehensive technical data for all insulation products, enabling accurate thermal modelling and U-value calculations that demonstrate regulatory compliance and support sustainable building certifications. Our relationships with leading manufacturers mean we can access the latest product innovations, from vacuum insulation panels for extreme performance requirements through to bio-based insulation materials for projects prioritising embodied carbon reduction.
We have built our reputation by supplying products from manufacturers whose performance data is reliable, whose technical support responds when needed, and whose materials deliver the specified performance year after year. Our Dublin trade counter maintains substantial stocks of flat roof insulation for immediate collection by contractors, eliminating the project delays associated with special orders or material shortages. We supply complete system packages including insulation boards, cover boards, vapour control layers, and compatible fixings, streamlining procurement whilst ensuring material compatibility throughout the roof assembly. Whether you're a contractor pricing a tender, an architect specifying thermal performance, or a quantity surveyor seeking competitive rates on volume orders, QBM provides the materials, technical support, and commercial terms that make successful projects possible.
Got a Question? Find the Answer Here
Does QBM provide insulation installation services, or only supply materials?
QBM is a specialist roofing materials supplier and does not provide installation services. We supply high-quality thermal insulation products to professional contractors, builders, and roofing specialists across Ireland. Our Dublin trade counter provides expert product selection advice, U-value calculations, and technical support to help installers specify and procure appropriate materials, whilst your chosen contractor handles the actual installation. This focus on supply allows us to maintain comprehensive stock levels and provide the technical expertise that supports successful project delivery. We're happy to recommend approved installers for specific systems when requested.
Which type of insulation is best for flat roofs in Ireland – PIR or stone wool?
Both insulation types offer distinct advantages depending on project requirements. PIR (polyisocyanurete) boards provide superior thermal performance with lambda values around 0.022-0.023 W/mK, enabling thinner roof build-ups for projects with height constraints or demanding U-value targets. Stone wool insulation like ROCKWOOL boards offers exceptional fire performance, excellent acoustic properties, and superior dimensional stability across temperature variations, making it preferred for commercial buildings where fire safety is paramount. The optimal choice depends on factors including target U-value, fire rating requirements, waterproofing system compatibility, acoustic needs, and budget. Our technical team can recommend appropriate solutions based on your specific project parameters.
How do I calculate the insulation thickness needed to meet Building Regulations?
Insulation thickness requirements depend on multiple factors, including target U-value, insulation material lambda value, roof construction type, and presence of thermal bridging elements. As a general guide, achieving the typical Part L requirement of 0.20 W/mK for flat roofs usually requires approximately 120-140mm of PIR insulation or 160-180mm of stone wool, though exact requirements vary based on the complete roof assembly. QBM's technical team can provide detailed U-value calculations for your specific project, accounting for all roof components, including decking, vapour control layers, insulation, cover boards, and waterproofing membranes. We recommend consulting with a building physicist or qualified advisor for complex projects or those targeting enhanced performance standards.
Can insulation boards be used with any waterproofing system, or are there compatibility requirements?
Insulation compatibility with waterproofing systems is critical for both performance and warranty compliance. Different membrane systems impose specific substrate requirements that affect insulation selection. For instance, torch-applied bitumen systems require insulation with higher temperature resistance, mechanically fastened single ply systems need higher compressive strength to resist fastener pull-through, and fully adhered systems demand dimensionally stable substrates that won't compromise adhesive bonds. Most manufacturers specify approved insulation substrates for their waterproofing systems, and using non-approved combinations typically voids product warranties. QBM supplies insulation products that carry manufacturer approvals for major waterproofing systems, and our technical team can confirm compatibility for your specific project requirements.
What's the difference between insulation boards and cover boards, and are both necessary?
Insulation boards provide the primary thermal resistance in flat roof assemblies, manufactured from materials like PIR foam or stone wool with lambda values optimised for heat retention. Cover boards are high-density protective layers installed above insulation to resist mechanical damage from foot traffic, dropped tools, or aggregate ballast, whilst providing a stable, hard surface for waterproofing membrane installation. Many flat roof systems require cover boards to meet warranty conditions and ensure long-term durability, particularly with softer insulation materials or roofs subject to maintenance access. Some high-density insulation products like ROCKWOOL HARDROCK boards can eliminate the need for separate cover boards in certain applications. QBM can advise whether your chosen waterproofing system requires cover board protection based on manufacturer specifications.