Metal roof build up

Metal roof build ups are roof systems that use profiled metal sheets or smooth metal panels within the roof system. Residential homes use metal roof build ups with the metal sheet forming the final, weathering layer.

Some roof build ups use low profile inner metal sheets alongside high profile outer metal sheets, with a vapour control layer and insulation installed in between. In this type of system, the insulation specified will often be mineral wool.

Warm metal roofs are often seen in commercial buildings. In these types of systems, the insulation layer is laid over the profiled metal substrate together with the vapour control layer which is then finished with as weatherproofing finish.

A variety of materials are used for metal roofing including zinc, steel, aluminium and hybrid metal mixtures. These materials are usually finished with a coating that prevents rust and reflects heat if required.

What are the benefits of metal roof build up

• Lightweight and durable
• Can be laid over an existing roof
• Fast installation
• Ideal for low pitch roofs

What are the benefits of DensDeck® Roof Boards for a metal roof build ups?

Metal roofs are robust, can withstand adverse weather conditions and are also extremely durable. DensDeck® Roof Board cover boards are often installed to improve the acoustic performance of metal roof build ups. They also protect the insulation layer from compression and offer moisture resistance that shields the building envelope in case of unexpected leaks.

In an inverted roof system, especially if a higher profile metal sheet is used, roof boards may be installed to help ensure the insulation layer stays in place. They also help improve the acoustic performance of a metal roof build up.

Key benefits of DensDeck® Roof Boards for metal roof build ups

• Fire resistance
• Acoustic performance
• 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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