The QCC roof system powered by MEFOFLEX®
Quieter. Tight. Durable.
When metal roofs become a challenge due to rain noise, condensation, corrosion or complicated sealing details, it takes more than standard solutions. The QCC (Quiet Closed Coating) roof system is a patented system innovation that rethinks metal roofs: faster installation, less material used. QCC also combines several functions in a single factory coating.
This is made possible by the innovative and versatile technology basis: MEFOFLEX® from HUEHOCO. Mefoflex is an extruded, foamed EPDM elastomer coating that is firmly bonded to the metal in the factory.
The result is a modern metal roof coating that not only protects, but also insulates, seals and prevents condensation. It therefore replaces the various layers of conventional systems.
QCC roof system – simple, faster, better
The patented Quiet Closed Coating for metal roofs
For the first time, the QCC roof system combines a full-surface EPDM rubber coating on the underside of the sheet metal with proven standing seam technology. It thus solves typical challenges of metal roofs systemically instead of selectively.
Whether residential buildings, halls or commercial premises: QCC saves time on the construction site, reduces the amount of material required and at the same time provides sound insulation, sealing and protection – without additional layers or complicated special solutions.
Conventional systems
QCC roof system with EPDM coating
What is a modern metal roof coating?
Anyone searching for “metal roof coating” often thinks of subsequent refurbishment. In other words, coatings that are applied directly to the roof. However, the QCC system takes a different approach to this classic construction site coating:
The elastomer coating is continuously extruded in the factory, firmly bonded to metal strips and processed as a system component.
- Consistent quality
- Weather-independent processing
- Permanently stable connection of metal and elastomer
- Less susceptibility to errors in execution
The result is a metal roof coating that is not “just” a surface – but an integral part of a functional roof system.
MEFOFLEX® –
the technology behind QCC
MEFOFLEX® is a foamed EPDM elastomer coating that is applied directly to metal strips using an extrusion process. The coating is firmly bonded to the metal and remains permanently elastic even at extreme temperatures.
- Layer thickness: approx. 0.35 mm
- Temperature range: -40 °C to +130 °C permanently elastic
- Suitable metals: e.g. steel, stainless steel, aluminum alloys, zinc, copper, non-ferrous metals
- Belt widths: 400-800 mm, individual end widths possible
- Functional principle: 3 effects in one layer
MEFOFLEX® – simultaneously provides for:
- Sound attenuation
- Sealing
- Corrosion & condensate protection
It is precisely this multiple effect that makes MEFOFLEX® the ideal basis for system solutions such as the QCC roof system – and for many other applications.
For quality that does not depend on the weather and building site. A decisive difference to many classic roof coatings: MEFOFLEX® is not applied on site, but is continuously extruded at the factory. This means
- Controlled process instead of construction site risk
- Reproducible layer thickness
- Consistent adhesion
- High process reliability
MEFOFLEX® – for roofs and many other areas
The QCC roof system is a tangible example of how MEFOFLEX® works. The technology is also suitable for:
- Facades
- Window sills
- Ventilation / building technology
- Machine and vehicle construction
and other applications where sealing, insulation, damping and protection are required.
The advantages of the QCC roof system
A classic metal roof can become noisy when it rains or hails – especially in living or recreation areas.
The foamed elastomer layer in the QCC system contains enclosed air cells that effectively dampen structure-borne noise.
Advantage: No separate fleece mat or scrims required for noise reduction. Residents benefit from a significantly quieter roof surface.
A frequent weak point of metal roof constructions are penetrations, brackets or rebate areas. QCC relies on a structural principle here:
When double folding, the holders are completely enclosed by the rubber coating so that no water can penetrate.
Advantage: No additional sealants in the seams and no special sub-roof constructions required.
Moisture on the underside of metal surfaces is a critical factor – especially when temperatures fluctuate. In the QCC system, the EPDM elastomer layer acts as a permanent barrier against moisture and contact corrosion. This significantly reduces or prevents the formation of condensation.
Advantage: permanently protected metal underside, longer service life, fewer renovation risks.
With flat pitched metal roofs, separating layers are often used to prevent moisture and material contact. In the QCC system, this layer can be omitted in many cases: As the rubber underlayer does not allow moisture to pass through and adheres firmly to the metal, a structured separating layer (fleece) is often not required for flat roof structures.
Advantage: fewer layers, less material, less effort
The QCC coating is not only functional, but also robust. The elastomer coating is:
- resistant to ageing
- acid-resistant
- Temperature resistant
- water resistant
Advantage: long-lasting performance even in demanding weather conditions.
QCC is not limited to steep constructions. The system can be used from a roof pitch of 1.5° – even for flat curved barrel roofs.
Advantage: high flexibility in planning and execution.
Find out more now
Any questions?Are you planning a metal roof and want to avoid noise, condensation and leaks right from the start?
Request technical documentation on the QCC roof system powered by MEFOFLEX® now – including system structure, data sheet and application recommendations.
FAQs on the QCC metal roof coating
In short: MEFOFLEX® is more than a simple EPDM coating. It is a factory-extruded elastomer or EPDM foam coating that is firmly bonded to metal. It therefore fulfills exactly what many people are looking for in a modern metal roof coating: permanently elastic protection, damping and an additional functional layer.
MEFOFLEX® is applied to metal strips using an extrusion process and forms a foamed, elastic rubber layer. The coating remains permanently elastic over a wide temperature range (from -40 °C to +130 °C). It is also designed to be suitable for various metals (e.g. steel, stainless steel, aluminum alloys as well as zinc, copper and other non-ferrous metals).
This means that MEFOFLEX® is not “just” a metal roof coating, but a technological basis that performs several functions in system solutions such as the QCC roof system: sound insulation, waterproofing, corrosion and condensation protection.
The QCC roof system is not a classic EPDM membrane system, because with EPDM roof membranes, a waterproofing membrane is laid and mechanically fastened or bonded. With the QCC system, the “rubber coating” is already applied to the metal underside at the factory and is used systemically during installation.
This results in various advantages. The QCC roof system reduces the typical weak points of classic metal roof systems: The waterproofing is not just “on top”, but an integral part of the roof system. Even in demanding projects, this means: less material, fewer layers, fewer sources of error – and still a high sealing and protective effect.
The QCC roof system is suitable for many common metal roof materials and constructions where waterproofing, sound insulation and condensation protection are required at the same time:
- Zinc
- Aluminum
- Copper
- Stainless steel
- Steel
- Aluminum alloys and
- Non-ferrous metals
As an elastic metal roof coating, the QCC roof system powered by MEFLOELFEX can do more than just “protect”: it can dampen, seal and significantly increase the service life of a metal roof.
Elasticity is particularly important with metal, because metals work – due to temperature changes, wind loads and mechanical vibrations. This results in important advantages of an elastic roof coating:
- Vibration damping: reduces noise from rain/hail
- Sealing effect: protects critical areas from water ingress
- Corrosion protection: Barrier against moisture and contact corrosion
- Condensation protection: reduces or prevents condensation
- Durability: resistant to ageing, water, temperature and other stresses
- System simplification: fewer additional layers such as separating layers/nonwovens required
When rain or hail hits metal, the energy is transmitted as structure-borne sound via the sheet metal. Conventional systems often try to mitigate this by using separating layers, fleece or additional insulating layers.
In the QCC system, sound insulation works directly via the elastic coating: the EPDM rubber layer contains enclosed air cells that act like a damping buffer: they reduce the transmission of vibrations and thus significantly reduce rain and hail noise.
It significantly reduces condensation and prevents condensation on the underside of the sheet. The coating acts as an anti-condensation coating and forms a barrier against moisture. At the same time, contact corrosion is reduced because the metal underside is not “naked” but permanently protected.
Condensation occurs when warm air meets cold metal surfaces. This is a common problem, especially on industrial and warehouse roofs, and usually manifests itself as dripping water, increased risk of corrosion and actual moisture damage. This is where the QCC system powered by MEFOFLEX can be a real game changer.
The QCC roof system can be used from a roof pitch of just 1.5° – and is therefore also suitable for very flat roof shapes. This is a clear advantage over many classic metal roof constructions, where flat pitches require additional measures.
In most cases, a structured separation layer can be dispensed with, even on flat pitched roofs, because the rubber underlayer does not allow moisture to pass through and adheres directly to the metal. This is a significant cost advantage, as separating layers mean material, time and potential for errors.
Would you like to know exactly whether MEFOFLEX® or the QCC system is suitable for your project?
Request technical information – including system design, specifications and application notes.