Choosing the right material for a flat roof isn’t just about price or looks – it’s about finding a system that holds up under pressure. Commercial roofing systems do more than keep the rain out; they support energy performance, safety standards, and even brand perception.
So when it comes to single-ply vs felt roof builds, the decision could be more involved than it first seems. In this guide, we’ll unpack the main differences and help you get a clearer feel for which option might suit your property or project best.
Durability and Lifespan
When it comes to how long a roof lasts, both systems offer solid value, but in different ways. A single ply roofing membrane typically lasts around 25–40 years, depending on the installation and the manufacturer. It resists UV rays, flexes well with movement, and doesn’t mind a bit of regular foot traffic – handy for buildings with rooftop access.
Felt roofing for flat roofs, on the other hand, tends to fall slightly shorter in lifespan, around 10–25 years on average. It’s more prone to damage from heat or cold snaps.
For properties needing durable commercial roof materials that hold up in harsh weather or see occasional foot traffic, single ply tends to be the safer bet. That said, felt can still perform well in certain instances, although can be expensive for better quality systems.
Cost of Installation and Long-Term Value
On the surface, budget single layer felt roofing for flat roofs often wins on upfront price., and the materials themselves are generally cheaper. For budget-conscious refurbishments or smaller commercial units, it might seem like the obvious pick.
But things shift when you think long term. Single-ply roofing membrane systems, though more costly to install, tend to pay off over time. They usually require fewer repairs, are quicker to inspect, and many come with longer warranties, which helps with budgeting down the line.
Here’s a quick contrast:
- Felt roofing: Lower cost now, more maintenance later.
- Single ply: Slightly initial outlay, steadier performance and savings long term.
So, if you’re comparing flat roof replacement options with a focus on lifecycle value, single ply may bring more to the table over time.
Maintenance Requirements and Common Issues
Both roofing systems need a bit of upkeep now and then, though some are more demanding than others. Felt roofing for flat roofs tends to be more vulnerable to splitting, blistering, and water ingress over time, especially where drainage isn’t ideal. Patching is possible, but multiple repairs can stack up and get a bit fiddly.
Single-ply roofing membranes usually require less attention. Their welded seams and resistant surface mean they shrug off standing water and UV exposure fairly well. Visual inspections and the odd clean-up often do the job.
In short:
- Felt: More maintenance, more reactive.
- Single ply: Less hassle, more preventative.
For building managers balancing cost and convenience, this difference can make a big impact over time.
Environmental Impact and Sustainability
For those looking to meet sustainability goals, material choice makes a real difference. Single-ply roofing membranes often come out ahead thanks to their lighter weight, recyclability, and lower overall environmental load. Some versions are even made from recycled content and work well with insulation upgrades – a bonus for energy performance.
Felt roofing for flat roofs has made strides, but still involves more bitumen and can emit more volatile organic compounds (VOCs) during installation. That said, modern felt systems are starting to include greener manufacturing processes.
If your project leans towards commercial roofing systems that support BREEAM or similar certifications, single ply tends to align better. It’s not perfect, but it’s generally a cleaner fit for environmentally conscious developments.
Aesthetic Appeal and Finish Options
Looks aren’t everything, but they do matter when the roof is on show. Single-ply roofing membranes offer a cleaner, more modern finish and come in a variety of colours. For buildings with visible rooftops or branded areas, that flexibility can make a difference. Logos, walkways, or solar panel bases? No problem.
Felt roofing, on the other hand, is more limited. It tends to stick with darker tones and a more traditional appearance. That works just fine for hidden roofs, but might fall short where visual impact matters.
So if presentation plays a part, single ply gives you more room to work with.
Installation Time and Disruption to Business
Speed and disruption matter – especially in busy buildings. Single-ply roofing membranes are usually quicker to install, particularly when prefabricated rolls are used. The process is cleaner, quieter, and often involves fewer layers, which keeps things moving with less mess.
Felt roofing, by contrast, often needs multiple layers and can involve hot works – something that might not suit occupied buildings or sensitive environments. Weather can delay things too, especially in colder seasons.
So for teams trying to minimise business disruption or stick tightly to schedules, single ply tends to be the more flexible choice. It’s not always faster in every case, but it does cause fewer headaches along the way.
Suitability for Large-Scale or Complex Roofs
Not all roofs are neat rectangles. On larger or more intricate structures, flexibility and weight start to matter more than you might think. Single ply roofing membranes are lightweight, which eases pressure on the structure beneath – especially useful in retrofits or multi-storey builds. Their ability to mould around awkward shapes without too many seams makes them a bit of a favourite for complex layouts.
Felt roofing, being heavier and less forgiving around details, can be trickier to apply on larger or irregular surfaces. It works best on simpler, smaller footprints.
So, when you’re weighing up flat roof replacement options for big or bespoke builds, single ply often fits more naturally, quite literally.
At the end of the day, picking between single ply vs felt roof options depends on what your building really needs, and what you can live without. If you’d like an expert eye on it, just contact us – AAC Flat Roofing is here to help.
