Common Questions About Flat Roof Systems Answered

Choosing the right material for your flat roof depends on a few key factors, like the type of roof, how detailed or complex the design is, and the condition of the existing structure. There are plenty of options to choose from, including traditional bitumen felt, GRP fibreglass, and modern single-ply like EPDM. Each option has its advantages, so the best choice comes down to what suits your property’s needs and the specifics of the installation. Get in touch with us today and we’ll be happy to help you find the perfect system for your flat roof project. 

The lifespan of your flat roof depends on the material you choose. EPDM (rubber roofing) and GRP (fibreglass) can last 20 to 30 years or more with proper care, offering great durability and minimal maintenance. Bitumen felt, while more affordable, typically lasts around 10 to 20 years. Your roof’s lifespan also depends on factors like installation quality, weather, and maintenance. With the right care, you can maximise the lifespan of your roof. If you're not sure which option is best, we’re here to guide you. 

The installation time for your flat roof depends on the size and complexity of the job. For most standard flat roofs, we can typically complete the installation within a few days. However, if there are additional tasks like replacing decking or improving drainage, it might take a bit longer. Before we start, we’ll provide you with an estimated timeline, so you’ll know exactly when to expect everything to be finished. Rest assured, we always work efficiently to get the job done to the highest standards.

Yes, flat roofs do require some maintenance but don’t worry as we can help you with this. Regular maintenance helps ensure your roof stays in top shape and can extend its lifespan. For example, it's important to check for any debris like leaves or branches that might block drainage systems and cause water to pool. You should also keep an eye out for any cracks or damage in the roofing material, especially after a storm or if it has been snowing. If you’re unsure about how to maintain your roof or need help with an inspection, get in touch with us today. We'll be happy to help. 

If you’re just adding a new waterproof layer over your existing roof without removing the old one, this counts as a repair, so upgrading the insulation isn’t necessary. However, if the roof is being completely stripped, including the decking and the current insulation doesn’t meet the standards set by Part L of the building regulations, you’ll need to upgrade the insulation if it’s practical to do so.

We’d be happy to assess your roof and explain what’s needed to ensure it’s compliant and well-insulated. 

It’s not unusual to see some water pooling on a flat roof, and in many cases, it’s nothing to worry about. Some roofs are even designed to hold a little water for cooling. However, if the roof doesn’t have enough of a slope to help water drain—ideally 1:80—you might notice more pooling. Over time, movement in the structure can also cause sagging, which can add to the issue.

If the water evaporates within a short time, it’s usually fine, but if it lingers or you’re concerned, we can help. One solution we offer is installing tapered furrings under the decking to improve drainage. Let us know if you’d like us to take a look!

In the UK, Building Regulations approval is usually required for a new flat roof to ensure it meets important standards. This includes thermal performance (Part L) to improve insulation, structural integrity (Part A) to support loads like snow and wind, fire safety (Part B) for compliant materials, and drainage and ventilation (Part C) to prevent damp and condensation. However, approval may not be needed if you’re only repairing or replacing less than 25% of the roof covering, as long as you’re not altering the insulation, structure, or drainage. To be sure, it’s always best to check with your local authority Building Control Office before starting work.