Collection: lava 20 complete overlay system

Why Traditional Repairs Fail — And How Lava 20 Is Different

Traditional roof repairs are a short-term fix at best. Patches peel, sealants crack, and felt degrades — because they all rely on joints and overlaps, the weakest points of any roof. Over time, water finds its way through, and the cycle of leaks and repairs begins again.

Lava 20 works differently. Instead of patching the problem, it eliminates it entirely by encapsulating the entire roof surface in a single, continuous GRP membrane.

✔ Creates a Seamless Waterproof Membrane Unlike felt, bitumen, or patch repairs, Lava 20 cures as one unbroken layer across the entire roof surface. With no joints, seams, or overlaps, there are simply no weak points for water to penetrate — giving you complete, edge-to-edge protection that lasts.

✔ Flexible and Crack-Resistant Roofs expand and contract with every change in temperature. Rigid repair materials crack under this stress, reopening the very gaps you sealed. Lava 20's flexible GRP formula moves with the roof, maintaining a watertight bond through freeze-thaw cycles, summer heat, and everything in between.

✔ Strong Adhesion to Multiple Surfaces Lava 20 bonds directly to a wide range of existing substrates including felt, concrete, asphalt, timber, and more — making it ideal for overlay applications without the need for a costly strip-out. Once cured, it won't lift, peel, or delaminate.

✔ Prevents Future Leaks — For Good Most repairs treat the symptom. Lava 20 treats the cause. By encapsulating the entire roof surface, it removes the conditions that allow leaks to develop in the first place — giving you lasting peace of mind rather than a temporary fix.

👉 Also widely used as the membrane of choice in professional roof leak repair kit solutions across the UK.

Simple Application — No Experience Needed

You don't need specialist tools, training, or a roofing contractor. The Lava 20 system is designed to be straightforward for confident DIYers, with a clear step-by-step process:

1. Clean the surface — Remove dirt, debris, moss, and any loose material. The surface must be dry and structurally sound.
2. Apply primer — Ensures maximum adhesion between the Lava 20 system and your existing roof surface.
3. Reinforce cracks and joints — Use fibreglass matting to bridge any existing cracks, splits, or vulnerable joints before the main application.
4. Apply the waterproof membrane — Roll out the Lava 20 resin-saturated matting across the full roof surface, working methodically to avoid air pockets.
5. Allow to cure — Curing time varies with temperature, but in typical UK conditions the membrane will be fully hardened and waterproof within a few hours.

The end result is a durable, professional-quality waterproof finish — indistinguishable from a contractor-applied GRP roof, at a fraction of the cost.