Green roof build up

Green roof build ups, also known as roof gardens, green, living, or eco-roofs, are flat or low slope roof systems partially or completely covered with vegetation. Green roofs in the UK are popular in urban environments where they can be used by wildlife but also serve as recreational areas that can help readdress the areas eco balance.

There are several types of green roof build ups, however, the most often specified include extensive, intensive and biodiverse green roofs. Extensive green roofs have a shallow soil layer that supports the growth of moss, herbs and grasses. Biodiverse roofs replicate the ecological needs of their local area. Both these types of green roofs require minimal maintenance. Intensive green roofing systems form complete roof gardens with walkways, shrubs and trees and often have an irrigation system.

What are the benefits of green roof build up?

• Reduce the risk of urban heat islands
• Aids biodiversity and creates habitats for fauna and flora
• Noise reduction
• Increased property value
• Local authorities tend to favour structures with green roofs

What are the benefits of DensDeck® Roof Boards for a green roof build up?

Green roof systems must be designed to cope with the additional structural loading and the moisture they will be expected to retain to support any vegetation growing on it throughout its design life, they also help with storm water retention as well as minimising runoff for urban water management benefit. The moisture retention within the green roof build up is expected to be 50% higher than that of other roof systems. The choice of waterproofing membrane should reflect the performance requirements of the build-up in terms of robustness and root protection.

DensDeck® Roof Board cover boards are often specified for additional support and for the protection they can offer for the roof build up, especially the insulation layer. This includes protection from compression caused by the loads of the green roof, and the additional foot traffic, but also from unexpected objects that may penetrate the protective layers and cause water ingress. In addition, cover boards also improve the moisture resistance and can increase the design life of the green roof build up.

Key benefits of DensDeck® Roof Boards for green roof build up

• Dimensional strength
• Insulation protection
• Puncture resistance
• Extended roof design life

technical data & downloads

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


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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