Roof Access Board

A roof access board is a cover board designed to help with static loads and to accommodate the mechanical load of heavy foot and vehicular traffic on roof systems of residential and commercial buildings. This type of cover board improves the dimensional stability of the roof assembly and helps protects the roof membrane. They can be specified with most flat and low slope roof build ups, including solar, green, and metal roof systems and roof terraces.

Gypsum core boards have superior compressive strength and are relatively light when compared to cementitious cover boards or high density wood boards. They are installed between the insulation and the waterproofing layer of a roofing assembly and help protect both layers.

Gypsum core cover boards with fibreglass mat facers provide a compatible, homogenous substrate for the installation of waterproofing membranes that results in a stronger, more robust bond. This allows roof access and helps protects the membrane from punctures caused by incidental impact or dropped tools during the construction stage and maintenance visits. Cover boards also help to protect the insulation layer from compression caused by mechanical loads and prevent any damage that could affect its thermal performance.

What is the application of roof access DensDeck® Roof Boards?

DensDeck® Roof Boards provide an effective working platform for roofing assemblies under construction. The cover board can accommodate loads of increased foot traffic and heavy roof equipment installations and help protect the roof assembly throughout its design life. Roof access cover boards can be specified for increased protection of both commercial and industrial buildings. Datacentres, biotechnology centres and airport buildings that require roof access for maintenance benefit from the robust protection DensDeck® Roof Boards provide.

Our DensDeck® Roof Board is the ideal substrate for installation of mechanically fixed, semi adhered and adhered roof membranes. The flat, homogenous surface increases product compatibility and allows for an even spread of adhesive. The strength of the board enhances the fastener pull performance. This means a stronger bond between the roofing membrane and the cover board that helps protect the membrane from penetrations by human actions, such as tools dropped during a maintenance visit, or incidental punctures by flying debris.

The high dimensional strength of the DensDeck® Roof Board helps protect the insulation layer from compression that foot traffic or heavy plant installed on the roof of a building could cause.

Roof Access Board

What are the benefits of roof access boards?

• Impact resistance
• Puncture resistance
• Resistance to human caused events
• Resistance from the dynamic impact of flying debris
• Improves load distribution for heavy foot and vehicular traffic and plant installations


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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