AQUAPANEL® Cement Board Rooftop

AQUAPANEL® Cement Board Rooftop

Flat roofs make up a significant amount of the world’s skylines. Whether industial units, commercial venues or residential dwellings, these buildings all take a differnet approach when it comes to their roofs - and each faces unique requirements that AQUAPANEL® Cement Board Rooftop has been designed to address, by enhancing roofing system with a range of benefits:

  • Robustness
  • Fire protection
  • Weather resistance
  • Lifetime costs


AQUAPANEL® Cement Board Rooftop can be installed as a lightweight 6 mm cover board between the insulation and the waterproofing layer, or as a 12.5 mm substrate board directly onto the steel deck. Each application can be used individually, or both can be combined in one roof construction – with either option bringing the benefits of AQUAPANEL® Cement Board Rooftop into your roof system. 



AQUAPANEL® Cement Board Rooftop adds strength to the roof and the wider building. So, whether you need to mount heat, ventilation and air-conditioning units (HVAC) solar panels, exterior cleaning cages or other equipment, or you need to retain access for workers, you can be assured of the strength, safety and stability of your roof.

Non-combustible (building material class A1) and protection from sources of fire outside the building, the cover board is a strong, robust and reliable first line of defence. Additionally it allows the use of components such as fire-resistant mineral wool, which substantially reduces the fire load of the whole system.

Your roof needs to cope with many impacts, from hailstones to footfall - even to heavy machinery stressing the roof surface with high point loads. Therefore the roof needs a high load-bearing capacity in particular for heavy concentrated loads - especially when less pressure-resistant insulations are applied. AQUAPANEL® Cement Board Rooftop is build to withstand it all, protecting both membrane and insulation.

AQUAPANEL® Technology is also integrated in the prefabricated composite insulation board from Knauf Insulation. This board spreads the loads across a wider area even during installation, and also reduces effort and labour, as there is no need to fix the board to the insulation on site.

The strength and resistance of the cover board will invariably result in a longer roof life - and a lower total cost of ownership. No matter of the final design of the roof, whether it is a roof terrace, a green roof, or just rooftop pathways, you can trust it to perform, day in, day out. This means less maintenance or need for replacement, minimal problems over the system's lifetime, and a roof you can trust to last long and cost less overall.

Provided by the whole roofing system, wind uplift performance is a vital factor in resistance - and the resilient cover board plays a crucial role here.

AQUAPANEL® Cement Board Rooftop serves as a separation layer, preventing blistering and compatibility issues between the membrane, adhesive and substrate.



Like all AQUAPANEL® Cement Board products, the substrate board is 100% water resistant, and mould and mildew resistant. Strong and robust, it's build to cope with whatever the weather can trow at it. Additionally, with installing the board directly onto the steel deck - together with a vapour barrier - a robust temporary waterproofing can be achieved even before the insulation and the waterproofing layer are mounted. This means that the building envelope is reliably closed sooner and the interior works can start earlier, which safes a lot of time and money for your project.

The thickness and construction of AQUAPANEL® Cement Board Rooftop provides an effective barrier against external or internal noise, especially when insulation materials like PIR and EPS are used. For example rain noise can significantly be reduced inside the building.

Providing a flat surface to install the vapour barrier or the waterproofing membrane, the board is designed for easy, problem-free installation even during peak periodes of material transport and construction traffic on top of the roof. For example the professional material transport on top of the roof is done with a lift-and-roller, which is very difficult on trapezodial steel decks. The flat surface of AQUAPANEL® Cement Board Rooftop guarantees an easier transport of material.*

*The transport with a hand pallet truck is not recommended



Protection against fire from inside plays an important role - especially for extensive roofs with a steel deck as substrate. Any spreading of the fire via the roof has to be prevented. Besides the use of non-combustible insulation materials also thin vapour barriers with low fire loads (i.e. PE foil, aluminium) should be applied. Using the non-combustible AQUAPANEL® Cement Board Rooftop 12.5 mm as a substrate - and thereby bridging the low beads - those vapour barriers will be protected against piercing during the installation phase. This reliably prevents vapour diffusion into the roof construction from inside during the complete lifecycle of the flat roof.

Thinner roof designs are possible, because thinner layers of insulation can be applied facilitated by bridging the low beads of the steel deck with AQUAPANEL® Cement Board Rooftop.


AQUAPANEL® Cement Board Rooftop is the perfect component for flat and low-slope roofing systems, enhancing them in a variety of ways, adding strength, safety and sustainability to the overall roof - and being flexible for use in a range of applications:

Special application: AQUAPANEL® Cement Board Rooftop is also a premium solution for external firewalls, thanks to its non-combustibility. Installed as component in a non-flammable attic, it ensures that all requirements of fire protection regulations are met.



Note: Please consult the local partner organisation of Knauf Aquapanel for more information on country-specific building requirements and legislation. Technical advice on this website is based on standard criteria.

Complete set of accessories

AQUAPANEL® Cement Board Rooftop

Property Unit AQUAPANEL®
Cement Board Rooftop (6 mm)
Cement Board Rooftop (12.5 mm)
Width mm 900 1200 900 1200
Length mm 1200/2400 900/2400 1200/2250/2400 2400
Thickness mm 6 6 12.5 12.5
Property Unit AQUAPANEL®
Cement Board Rooftop
(6 mm)
Cement Board Rooftop
(12.5 mm)
Used as Cover Board Substrate Board
Weight kg/m² approx. 8.5 approx. 16.5
Dry bulk density
according to EN 12467
kg/m3 1250 1150
Bending strength (MPa)
according to EN 12467
N/mm2 ≥ 7 ≥ 7
Thermal conductivity
according to EN ISO 10456
W/mK 0.34 0.35
Thermal expansion 10−6/K-1 7 7
Water vapour diffusion coefficient μ
according to EN ISO 12572
48 66
Length variation 65% - 85% humidity
according to EN 318
mm/m 0.38 0.23
pH value 12 12
Mould resistance No growth (IBR certified) No growth (IBR certified)
Building material class
according to EN 13501
A1 non-combustible A1 non-combustible