The popularity of green roofs is growing across the UK, as more homeowners look for sustainable ways to insulate their properties, encourage biodiversity, and create eye-catching spaces. In fact, Google searches for ‘green roof quote’ have increased by 1000% compared to last year. But while the benefits are well documented, not every roof is automatically suited to support one.
Mike Storey, roofing expert at UKFR Roofing & Insulation, explains: “Green roofs can be a fantastic addition, but they’re not a one-size-fits-all solution. Structural integrity, accessibility, and even local climate play a role in determining if a roof is suitable.”
So, how can you tell if your home is a candidate for a green roof? Mike shares six key factors to consider:
1. Check the structural strength of your roof
Before any work begins, it’s essential to ensure your roof can safely support the additional weight of a green roof system, which includes soil, plants, drainage layers, and moisture.
Mike says, “Green roofs can add considerable weight when saturated. A professional assessment will confirm if your roof’s existing structure can handle this safely. A green roof can add 65kg to 300kg per sq.m, approximately, depending on the system chosen. So this extra weight can cause issues to roofs if they haven’t been designed to take any weight. A Lot of roofs are only designed to take a set weight loading, which is mostly for snow loading, so you need to ensure that the roof will take the weight of a green roof and the snow loading.”
2. Flat or low-pitch roofs are ideal
Mike says, “While green roofs can technically be installed on various roof types, flat or gently sloping roofs (typically with a pitch of no more than 10 degrees) are best suited. Steeper roofs may require specialist systems to prevent sliding and ensure even water distribution.”
3. Waterproofing condition matters
A green roof adds protection, but only if the existing waterproofing layer is in excellent condition.
“If there are any existing leaks or weaknesses, these will need to be fully repaired or replaced before installing a green system. You all need to ensure your roof covering is FFL Green roof approved so that the roots can’t get through the waterproofing,” says Mike.
4. Drainage and irrigation considerations
Proper drainage is crucial to avoid water pooling and root rot. Equally, in periods of drought, certain green roofs may need supplemental irrigation. Seek guidance from a green roof expert, who can advise on the best solution based on your chosen planting scheme and local weather patterns. Mike says, “The thing to look out for with green roof systems is if you see a sedum roof that is red, then the Sedums are stressed and need watering or don’t have enough stored in the system. A good green roof system will stay green all year round under normal weather conditions. We are experiencing extreme heat and drought once every few years, and this is normal for the sedums to then go red, they will come back to full health with watering.” Also, “If your roof already has standing water on it before you install a green roof, this won’t make it any better. Look at installing tapered insulation or a new roof deck with firings to ensure you have a minimum of 1:60 fall.”
5. Accessibility for installation and maintenance
Green roofs aren’t completely maintenance-free. Access for installation, routine inspections, weeding, and occasional replanting should be factored in.
Mike adds, “Simple access via a loft hatch or roof terrace can make long-term maintenance much easier.”
6. Planning permission and local regulations
In most cases, green roofs fall within permitted development, but depending on your property type or location (especially listed buildings or conservation areas), additional permissions may be required. Always check with your local authority before proceeding.
As green roofs continue to trend for their environmental benefits, sound insulation, and visual appeal, understanding your home’s suitability is the crucial first step.
Mike adds, “With the right preparation, a green roof can offer decades of beauty, sustainability, and performance, but it’s vital to get expert advice before making the leap.”
For more information, visit UK Flat Roofing.
