Are Flat Roofs Energy Efficient?

Daniel Bracewell • 29 March 2021

Flat-roofed homes are popular for their modern appearance, but a well-maintained flat roof is also considered very energy efficient by building professionals. Of course, this depends on the materials that are used, but most flat roofs now employ innovative insulation methods which give them an advantage over older pitched roofs.

A flat roof over an unheated building such as a garage or shed will not need any insulation, but if your flat roof is over a living space, it is essential to have effective insulation to prevent heat loss. Not only will it keep the room warmer in winter and save you money on heating bills, but it will also stay cooler in summer.

In the UK ‘warm deck’ insulation is generally used, as this is more suited to a cold damp climate. The insulation is placed above the roofing joists or rafters, but below the waterproof membrane, as Building Design magazine explains. EPDM rubber is widely used as a covering owing to its durability, toughness, and flexibility.

Old-style flat roofs were insulated with wool type or ‘rockwool’ insulation, which was fitted directly between the joists. This caused issues with condensation and damp, as there was no damp-proof membrane or ventilation fitted. The material also has a poor thermal performance compared with modern methods.

It is difficult to tell just by looking at a flat roof exactly what insulation method it has, but if it is over 20 years old, it will almost certainly benefit from being upgraded. To add insulation to an older roof, some removal and replacement of the existing structure will be required, according to the Simple Energy Advice website.

The website also advises that insulating a flat roof is never a DIY job, and a professional roofer should be employed to ensure that the work is carried out adequately and safely.

If you are looking for a flat roof specialist in Stockport, get in touch today to see how we can help.

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Can You Install Solar Panels On A Flat Roof?

by Daniel Bracewell • 10 December 2025

If you’re exploring how to lower your energy bills and reduce your carbon footprint, you may be looking at the likes of solar panels for your home. But what if your property has a flat roof rather than a pitched roof? Can you still install solar panels on a flat roof? The short answer is yes, you can! In fact, it is often easier to install solar panels on a flat roof than it is to fit them to a sloped roof, which might make this an even more appealing avenue to explore when you’re looking at flat roof ideas . In many cases, you also don’t need planning permission to install solar panels on your flat roof. Of course, there are exceptions if you have a listed building or live in a conservation area, but if you own your house (different rules apply for flats too), you should be free to add solar panels to your home as you choose. There are different kinds of mounting systems for flat roof solar panels and which is most appropriate for your home will depend on the direction it faces. It is worth noting that the cost of installing solar panels is often higher on flat roofs because of the mounting system, but some of this can be offset by the lower labour costs because the installation process is usually more straightforward. One of the main reasons homeowners install solar panels is to reduce their energy bills. Many report savings of hundreds of pounds each year, which means these panels often pay for themselves relatively quickly. What’s more, under the Smart Export Guarantee , you can sell any energy you don’t use back to the National Grid, which can increase the rate at which your investment in solar panels pays for itself. So, if you are exploring ways to make the most of your flat roof, consider solar panels as an option to reduce your energy bills and do good for the environment.