Roof refurbishments

A roof refurbishment re-establishes the integrity of a roof system and/or can upgrade its performance. They can encompass the whole roof that has become unserviceable, or which has reached the end of its design life, or only the parts of a roof that suffered damage. Commercial roof refurbishment often involves an upgrade of the current roof to change its use. Roof refurbishment can help increase the ability to accommodate the increased loading of heavier traffic and the dead load of any new plant.

As we seek to increase the energy efficiency of our buildings, roof refurbishments are required to improve the thermal performance of the building envelope. Roof refurbishment is often required for the installation of solar panels, larger air source heat pumps assemblies and other plant.

When refurbishing the whole roof area, the choice is to strip the existing roof or overlay it. To choose the correct remedial action, it is important to determine the condition of the roof, the deck and the supporting structure. If any of the materials are failing, they should be replaced. If the decision is to overlay the roof, the design life of the overlaid components should be considered to prevent potential premature failure of the roof system if the materials with shorter life expectancy fail first.

Benefits of roof refurbishments

• Increased loading on the roof
• Improved acoustic and fire performance
• Renewable energy technology integration
• Change of roof system, often to a green roof

What are the benefits of DensDeck® Roof Boards for roof refurbishments?

The weight of new materials, any existing roof accessories, drainage falls and the increased surface level, especially if the insulation layer is added or replaced, are amongst the considerations when refurbishing a flat roof. Whether the choice is made to strip the existing roof components back, fully or in part, or the entire roof is being refurbished, the specification of cover boards should be considered.

DensDeck® Roof Board cover boards can be used if the roof is overlayed or fully refurbished. They provide a high performing substrate for the installation of a waterproofing membrane and help overcome potential challenges with the compatibility of the old and new roof components.

DensDeck® Roof Board cover boards also significantly improve the moisture resistance of the roof system and protect the building envelope during the refurbishment works. They also enhance the acoustic and fire performance of a roof system, leading to increased occupant comfort and better overall building performance.

Key benefits of DensDeck® Roof Boards for roof refurbishments

  • Strong membrane bond
  • Dimensional strength
  • Extended design life
  • Fire resistance
  • Thermal performance roof terraces

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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