Felt has been the default choice for flat roofs in Britain for generations, largely because it's cheap and familiar to most builders. That doesn't necessarily make it the better long-term option, and the comparison with EPDM is worth understanding before you commit either way.
Where Felt Falls Short
Traditional felt is applied in layers using heat or torches, and every joint between those layers is a potential weak point where water can eventually find its way in. It also tends to become brittle and crack over time as it's exposed to UV light and temperature swings, so a felt roof that looks fine at year eight can start blistering and splitting not long after. Most felt roofs need replacing or heavily patching within 10 to 15 years.
Where EPDM Has the Edge
A single sheet of EPDM covers most domestic flat roofs with no joints at all, or very few on larger roofs, which removes the main point of failure you get with layered felt systems. It stays flexible in cold weather rather than cracking, shrugs off UV exposure far better, and generally needs little beyond an occasional visual check and clearing of leaves or moss. It usually costs a bit more upfront than felt, but given it can last two to three times as long with less maintenance, most homeowners find it works out better value over the roof's lifetime. Brunel Roofing Bristol fits both systems and can talk through which suits your particular roof and budget.
Appearance and Everyday Practicality
There's also a visual difference worth knowing about. Felt roofs, especially older mineral felt, tend to look patchy and grey within a few years as the surface weathers unevenly, while EPDM keeps a smooth, consistent black finish for most of its working life. For anyone who can see the roof from an upstairs window or a neighbouring property, that's a genuine consideration rather than just cosmetics.
Guarantees tend to reflect the difference too. Felt roofs are commonly guaranteed for around 10 years by tradespeople, whereas Brunel Roofing Bristol backs EPDM installations with a 15-year guarantee, which says something about how much more confidence contractors generally have in the material holding up over time.
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