Weather Resistant Roof Board

Weather resistant roof boards are high performance gypsum core cover boards with fibreglass mat facings designed to help protect the roofing system from adverse weather conditions and extend its design life. Cover boards are installed above the insulation layer and below the waterproofing layer of adhered or partially adhered and mechanically fastened roof systems. They lend themselves well in large span commercial buildings, where they provide superior dimensional stability. Specification of cover boards is not limited to single ply flat roofs and extends to low slope, green, solar, and metal roofs and roof terraces of new buildings and roof refurbishments alike.

Fibreglass mat gypsum core cover boards can be used as a compatible substrate for a variety of waterproofing coverings. The thin and light boards provide a homogenous base that creates a robust and even bond with waterproofing membranes. This improves wind uplift resistance of the roof build up. The fibreglass facing of the cover board helps protect the membrane from repeat hail strikes or accidental puncture by flying debris.

By better protecting the building envelope from impact and structural damage, the cover board reduces the possibility of water ingress throughout the design life of the roof system.

What is the application of weather resistant DensDeck® Roof Boards

DensDeck® Roof Boards are effective as a high performance weather resistant barrier that helps protect roofing assemblies of both commercial and industrial buildings. Our cover boards help address the specific challenges of commercial structures in a variety of critical sectors such as datacentres and biotechnology centres. They enhance the building performance of new buildings as well as refurbishment projects.

Gypsum core cover boards have varying levels of moisture resistance. DensDeck® Prime Roof Boards are enhanced with the patented EONIC™ Technology which doubles the resistance of the cover board to moisture. The cover board offers the benefit of 5% total water absorption resistance by weight, and 1-gram nominal surface water absorption performance on both sides of the board.

The strong, flat, and homogenous DensDeck® Roof Board is the ideal substrate for installation of adhered, semi-adhered and mechanically fixed membranes. The strong bond with the membrane increases vertical pull strength of the roof assembly and helps protect it from wind uplift. The membrane is also better protected from repeated hail strikes and flying debris. The extended design life and reliable, robust performance help prevent service interruptions in critical sectors and helps to keep maintenance requirements low.

Weather Resistant Roof Board

What are the benefits of weather resistant roof boards?

• Wind resistance
• Moisture resistance
• Hail resistance
• Impact and puncture resistance


DensDeck® Prime Roof Board
Thickness (mm)6.4 (¼ inch)12.7 (½ inch)15.9 (⅝ inch)
Length (mm)243824382438
Width (mm)1219

Roof protection boards

The DensDeck® Roof Board helps protect all types of flat roof build ups from natural forces such as hail and wind. They provide dimensional stability to the roof system and shield the waterproofing membrane from dead loads of heavy plant and sudden impact, such as dropped tools or flying debris, whilst adding additional fire resistance.

Sound Reduction

DensDeck® Roof Boards help block the sound penetrating through a roof assembly into a building. Our cover boards help increase occupant acoustic comfort even in high noise commercial settings such as airports.

Acoustic performance >

Fire Resistant

DensDeck® Roof Boards help protect the roof assembly from external fire sources, such as malfunctioning solar panels or embers from a nearby building. They also help to protect the roof space from internal fire spread.

Fire resistance >

Weather Resistance

DensDeck® Roof Boards enhance fastener pull through, increase membrane bond strength as well as dimensional strength. This means greater resistance to wind uplift and repeated hail strikes.

Weather resistance >

Roof Access

DensDeck® Roof Boards spread loads and helps protect the insulation layer installed underneath roof build ups. Our cover boards have high compressive strength and add structural strength to the roof assembly, absorbing foot traffic and helping protect from sudden, damaging impacts.

Roof access >


Datacentre construction has a unique set of demands on the building envelope performance. The roof system must be robust and waterproof. Any moisture penetrating through the building envelope could cause service disruption with considerable commercial impact or even damage the expensive equipment. Specification of fibreglass mat face gypsum cover boards is ideal for both new datacentre projects and roof renovations that seek fast project delivery times and exceptional building performance.

Heritage buildings

Conservation and refurbishment of roofs for heritage buildings demands attention to detail. They often use roof coverings made from traditional materials, making installation more time and labour intensive.

Heritage roofs may have areas that are difficult to access, posing a challenge when it comes to the installation and the performance of the roof system. Cover boards are specified to make roof refurbishment easier. They also help increase the building performance of traditional, heritage buildings.

Museums & libraries

Roofing systems for museums and libraries have the important function of protecting valuable collections and creating a safe, comfortable space for the public visiting the facilities. Museums and libraries often combine traditional heritage buildings and striking modern extensions.

This allows architects and designers to blend high performing heritage roof refurbishments with modern green, metal, solar panel roofs, roof terraces with parapet systems or a fusion of the various roof types. Cover boards are a crucial part of these roof build ups capable of enhancing their performance and extending their design life.


Airports, hangar and maintenance buildings, car parks and other buildings in the aviation sector present their own set of challenges. These projects have intensive schedules and once finished, the highest level of building performance is expected to keep passengers comfortable and safe.

The performance enhancing capabilities of fibreglass mat face gypsum cover boards are ideal for specification in the aviation sector.


The construction of biotech centres must overcome a very specific set of challenges. These buildings fall within the critical sector and the expectation is that their roofing systems must be very robust.

Specification of fibreglass mat facer gypsum core cover boards enhances the performance and longevity of roof systems for biotech centres. It can also target improvement in specific areas of building performance, as required by each project.

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