If the UK is to achieve its target of net zero by 2050, we must address the emissions associated with our built environment. The UK Green Building Council (UKGBC) estimates that buildings are directly responsible for 25% of UK carbon emissions and that “19% of the UK’s carbon footprint is operational emissions from energy needed to heat, cool, and power our buildings”. When we consider that 80% of the buildings which will be occupied in 2050 already exist, it is clear that refurbishing existing buildings must be a priority if we want to reduce our carbon footprint and protect the future of our planet.
Reducing the energy consumption of a building by improving its fabric performance during a refurb is certainly the first step in meeting these targets, helping to reduce the amount of energy used to heat or cool a space by retaining more of the modified air. However, to truly decarbonise these buildings, we must also look to minimising or even eliminating reliance on the grid by using ‘cleaner’ energy sources. In this blog, we will discuss using renewable technologies on a building as part of working towards a net zero strategy.
What makes solar PV a popular choice of renewable energy?
There are many kinds of zero carbon energy generation technologies, from wind turbines to hydroelectric dam systems. However, by far the most popular and accessible option for all kinds of buildings is solar photovoltaic (PV) panels, transforming unused roof space into a personal renewable power plant.
PV panels have cells that capture the radiant heat and light from the sun and convert this energy into electricity which can be used to power the building. Whilst the systems themselves obviously carry an upfront cost, the energy they provide is free and limitless, protecting building occupiers from grid outages and the volatility of energy prices. They are also increasingly being employed alongside battery storage, which stores the excess energy generated at the times when production is high, saving it for use when it is low. This helps to smooth out the peaks and troughs in supply for a constant, reliable energy source.
Of course, it is not as simple as adding a few panels to your roof plan. Every solar PV system must be carefully designed with a clear understanding of the project requirements to ensure they are cost effective and will perform as expected. However, with the correct consideration, they can offer several long-term benefits.
What are the benefits of installing solar PV on a property?
Environmental impact
Solar energy is a clean renewable energy source and therefore can massively reduce a buildings operational carbon footprint. These systems can also help developers to achieve points within sustainable building standards, such as BREEAM or LEED. Each programme will have different criteria to meet as part of the assessments but core principles such as environment protection, energy efficiency, occupant comfort, and wellbeing are all taken into consideration to some degree.
Reduce bills
Any energy generated on site helps reduce the demand for power supplied by the grid which, in turn, reduces energy bills. These savings over time can offset the initial installation cost, making it a cost-efficient investment. In addition, if you’re generating or storing more than you use, it’s possible for a property to be considered ‘net positive’ as it then has the potential to sell surplus back to the grid. You can read an overview of the Smart Export Guarantee and whether you might be eligible on the gov.uk website.
Energy security
As previously mentioned, buildings that can produce and store their own energy are less reliant on the grid. This is a particularly beneficial option for buildings that are in areas prone to power outages or need a consistent level of power to operate, such as production halls or hospitals. It also helps to provide businesses with more energy price stability.
Property value
Whilst there are some reports that installing solar panels can increase your property’s value, with figures fluctuating drastically up to 30% depending on building type and use, the main value is from its market appeal. Whether you’re renting or selling commercial properties, many people and businesses are looking to have more control over their bills as well as reduce the negative impact they may have on the environment.
Demonstrable corporate social responsibility
Installing solar PV makes it easier to demonstrate progress towards net zero targets, especially when fitted as part of a durable, energy efficient building envelope such as those achieved with insulated panel systems. A refurbished building can also achieve much improved EPC ratings and credits towards sustainable construction third-party certification schemes. This helps to attract more investors, buyers, and renters as some are willing to pay more for a property that has ‘green’ credentials or low-carbon technologies in place already in order to demonstrate their brand’s commitment to a low carbon future.
Do you need to replace a roof before fitting solar panels?
This is largely dependent on the condition of the existing roof. It is recommended that a reputable roofing surveyor is contacted in the first instance to determine whether a new roof is required. In particular, they’ll need to assess not just the condition but also the load-bearing capabilities of the existing structure to ensure they can support the weight of the required number of solar panels.
For example, the structural strength of insulated panel systems can provide an adaptable and durable platform for renewable technologies. These systems are readily compatible with PV panels and mounting solutions to ensure a quick, safe, and simple installation.
It is worth bearing in mind that, if you are installing photovoltaics on your roof, it makes sense to protect that investment by first ensuring that your roof is in tip-top condition and will not need excessive maintenance or replacement during the lifetime of the PV. It is also important to check whether the existing coating is suitable for the addition of PV arrays, and whether doing so will impact any warranty cover remaining. Contact the manufacturers for information about their specific coatings and warranties.
Managing risk
Single-component, factory pre-engineered systems, such as EPIC-member insulated panels, can help to reduce risk from working at height as there is less time spent on the roof. In addition to being quick and simple to install, once each panel is securely fixed it provides a safe, walkable platform from which to work from to fit the next panel as well as solar PV systems once the roof is complete.
When working at height, installers should also be utilising health and safety measures such as adequate training, mechanical handling, appropriate personal protective equipment (PPE), height safety equipment, and fall restraint systems.
In recent years, there’s also been research into managing fire risk in relation to the installation of solar PV on insulated roofs. PU Europe commissioned two comparative tests, the results of which can be explored in thePU Europe – Fire performance of thermal insulation products in end-use conditions (factsheet) or the PU Europe – Comparative fire tests of insulated flat roofs with photovoltaic installations (video).
How can EPIC-member panels help?
EPIC-member insulated panel manufacturers have long-standing histories delivering high quality building envelopes to suit a variety of building uses, such as warehouses, retail units, coldstores, industrial properties, and sports and leisure facilities. Get in touch with them directly to arrange a roof survey or discuss how their insulated panel and solar PV mounting systems can support your project and targets.