There is no single best flat-roof system — there is the right system for your roof, your budget and how long you want it to last. GRP fibreglass is a seamless, hard-wearing option that cures into a single unbroken skin with no joints to fail, which makes it excellent for the guest-house and extension roofs common across Llandudno; its one requirement is dry weather to lay and cure, which we plan around. EPDM rubber is a single-membrane system that handles thermal movement superbly and carries manufacturer warranties well beyond twenty years, ideal for larger flat areas.
Torch-on felt remains a sound, economical choice for garages and smaller roofs where budget leads, and modern high-performance felts are a world away from the tired three-layer felt roofs they replace. Whichever system we recommend, the deck beneath it and the falls across it matter more than the covering itself: a flat roof fails because water ponds where it cannot drain, so on every Llandudno job we check the deck for soft boards and correct the falls to shed water to the outlet before a single layer of covering goes down.
Where the room below a flat roof is habitable — a kitchen extension, a converted room — current Building Regulations require a warm-deck build-up with insulation above the deck. This keeps the structure warm, stops the condensation that ruins cold-deck roofs, and is something we build in as standard rather than as an upsell, because a flat roof done to the old cold-deck standard is a roof that will sweat and rot from the inside.
