Article


What makes a good school roof?


School roofs are being asked to do more than simply protect the building from the elements. From supporting solar photovoltaic systems and improving thermal performance to managing rainwater and, where appropriate, contributing to biodiversity, the roof can play an increasingly important role in a school’s overall design. School Building Editor Joe Bradbury looks at the key considerations for specifiers, including structural capacity, waterproofing, drainage, maintenance, renewable energy and the challenges of adapting existing school roofs.


T


he roof is one of the most fundamental elements of any school building, but it is also one of the areas where specification decisions can have consequences long after construction has finished. Its primary purpose remains straightforward: keeping the building watertight.


However, modern school projects increasingly require roofs to accommodate solar photovoltaic systems, manage rainwater, contribute to biodiversity, withstand increasingly demanding weather conditions and support the building’s overall energy performance. That does not mean every school needs a green roof, a blue roof or a roof covered in solar panels. The appropriate solution will depend on the building, its location, structure, budget and intended use.


For specifiers, the important consideration is how the roof can perform the required functions without compromising durability, maintainability or the rest of the building.


Start with the building


Roof specification needs to begin with the building rather than the roofing product.


A new secondary school with a large flat roof will present very different opportunities and constraints from a Victorian primary school with a pitched roof. Existing structures may have limited capacity for additional equipment, while new buildings can be designed from the outset to accommodate future requirements.


The roof’s geometry, structure, drainage strategy, orientation and access all need to be


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established early. This is particularly important as roofs are increasingly being asked to accommodate additional equipment. Solar panels, ventilation plant, rooflights, access systems and other services all require space and appropriate fixing arrangements. Trying to resolve these requirements after the roof design has already been established can create unnecessary conflicts.


Solar on the roof


Solar photovoltaic panels are becoming an increasingly familiar feature of school buildings. Large school roofs can provide substantial areas for photovoltaic arrays, making them an obvious location for renewable energy generation where the building and site are suitable. But specifying solar panels is not simply a matter of determining how many panels will fit.


The roof needs to be capable of supporting the additional loads associated with the system, including any mounting arrangements. Wind loading, fixing methods, waterproofing and access for maintenance all need to be considered.


The positioning of panels can also affect other roof functions. Plant, rooflights, drainage outlets and access routes need to remain accessible. Future maintenance of the roof itself should not require the unnecessary removal of photovoltaic equipment.


For new-build projects, these relationships can be designed into the roof from the beginning. On existing schools, a structural assessment and review of the existing waterproofing system may be necessary before a photovoltaic installation is considered.


Autumn 2026 issue 4185 Managing rainwater


Rainwater management is another area where roof design is becoming increasingly important.


Climate projections indicate that the UK needs to prepare for changes in rainfall patterns, including periods of heavier rainfall. Schools therefore need drainage systems capable of managing water effectively, while wider site drainage strategies may also need to control the rate at which water leaves the site.


The roof forms the first part of that process. Flat roofs require carefully designed falls and drainage arrangements to prevent excessive standing water. Outlets need to be positioned and detailed appropriately, while access for inspection and maintenance should be considered. Some projects may incorporate rainwater attenuation within the roof construction, while others may use conventional drainage connected to wider sustainable drainage systems. Again, there is no single solution that applies to every school.


The important specification issue is that the roof drainage strategy needs to work with the rest of the site rather than being designed in isolation.


Green roofs and biodiversity


Where appropriate, vegetation can also form part of the roof design. Green roofs can provide planting and habitat while also influencing how rainwater is retained and released from the roof. Different systems range from relatively lightweight extensive roofs requiring limited maintenance to more intensive planted environments requiring


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