Flat roofing services
Liquid Roofing & Waterproofing
Liquid waterproofing is the answer where a sheet membrane is not the best fit. Applied cold as a resin and cured into a seamless, fully bonded layer, it follows every upstand, outlet and awkward shape with no joints at all. We install PMMA and polyurethane systems for balconies, terraces, complex roofs and detailing across South Yorkshire.
What is liquid waterproofing?
A liquid system is exactly what it sounds like: a waterproof resin applied cold with a roller or brush, usually with a reinforcing fleece embedded into it, that cures into one continuous, seamless membrane. Because it is bonded across the whole surface and has no laps or joints, water has nowhere to get under it.
It is applied cold, with no naked flame, which makes it safe on occupied buildings, balconies and roofs close to other structures. The two systems we use most are PMMA and polyurethane, each suited to different situations.
When liquid systems are the right choice
Liquid comes into its own where a sheet membrane struggles. That means roofs with a lot of penetrations, pipes and upstands, intricate detailing, and small or awkwardly shaped areas where cutting and welding membrane is fiddly. It is also the go-to for balconies, terraces and walkways, where a trafficable, slip-resistant finish is needed.
It is excellent for overlays too. A liquid system can often be applied over a sound existing roof or detail to add a fresh, seamless waterproof layer without a full strip, and it bonds to most substrates, including concrete, felt, asphalt and metal.
PMMA or polyurethane?
PMMA resins cure remarkably fast, often within an hour, which means a roof or balcony can be back in use the same day, and they can be applied in cold weather when other systems cannot. They are ideal where speed and a rapid return to service matter, or for winter work.
Polyurethane systems are prized for their flexibility and value over larger, simpler areas. At the survey we recommend the system that fits the job, the conditions and the budget, and we explain why.
Why choose us
What you get with Sureseal
Seamless & fully bonded
No laps or joints, bonded across the whole surface so water has nowhere to get under it.
Cold-applied, no flame
Applied cold, making it safe for occupied buildings, balconies and tight spaces.
Ideal for detailing
Follows pipes, upstands and awkward shapes that are difficult to detail in sheet membrane.
Rapid-cure options
PMMA systems cure within the hour, so balconies and roofs can be back in use the same day.
Systems & materials
What we install and use
PMMA resin systems
Fast-curing methacrylate systems, back in use the same day and suitable for cold-weather work.
Polyurethane systems
Flexible, hard-wearing liquid waterproofing, well suited to larger or simpler areas.
Reinforcement fleece
Embedded into the resin to add strength and bridge movement, for a tough, monolithic finish.
Trafficable & anti-slip finishes
Slip-resistant surfacing for balconies, terraces and walkways that get foot traffic.
Our process
What to expect
- 1
Survey & assessment
We assess the substrate and detailing and recommend the right liquid system for the job.
- 2
Preparation & priming
The surface is cleaned, made good and primed so the resin bonds properly.
- 3
Resin & reinforcement
The waterproof resin is applied with a reinforcing fleece embedded for strength.
- 4
Topcoat & finish
A topcoat, with an anti-slip finish where needed, completes a seamless waterproof layer.
- 5
Inspection & guarantee
The work is inspected and signed off with a manufacturer-backed guarantee.
Frequently asked questions
How long does a liquid roof last?
A correctly installed liquid system has a long service life and carries a manufacturer guarantee, often 20 years or more depending on the system specified.
Can liquid waterproofing go over my existing roof?
Often, yes. Liquid systems bond to most sound substrates, including felt, asphalt, concrete and metal, so an overlay can add a fresh seamless layer without a full strip.
Is liquid waterproofing good for a balcony or terrace?
Yes. It is one of the best options for balconies, terraces and walkways, finished with a trafficable, anti-slip surface that is both watertight and usable.
Can you apply it in winter?
PMMA systems cure fast and can be applied in cold conditions, so winter is not a barrier. We match the system to the weather and the timescale.
Why choose liquid over single ply?
For complex, heavily detailed or small roofs, and for balconies, liquid often outperforms sheet membrane because it is seamless and follows every shape. For large, simple roofs, single ply is usually the better value. We advise on the right fit.
Other flat roofing services
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Large-area single ply roofing for warehouses, units and public buildings. Phased, certified, minimal disruption.
Learn more →Roof Maintenance
Planned maintenance, surveys and minor repairs that protect your roof and keep manufacturer guarantees valid.
Learn more →Single Ply Flat Roofing
Hot-air welded PVC & TPO membrane systems, the watertight, long-life choice for flat and low-pitch roofs.
Learn more →Domestic Flat Roofing
Flat roofs for extensions, dormers, garages and porches, warm, watertight and finished to a high standard.
Learn more →New Roofs & Replacement
Full strip-and-refit replacements and brand-new flat roofs, built up as warm roofs and guaranteed for the long term.
Learn more →Flat Roof Repairs
Leak detection and lasting repairs, plus honest advice on whether a repair or a new roof is the smarter spend.
Learn more →Electronic Leak Detection
We test roofs electronically to pinpoint leaks and prove integrity, then give you a full report with every breach located and photographed.
Learn more →Get a free, no-obligation flat roofing quote
Speak to a single ply specialist today. We survey your roof, explain your options and put it all in writing, with no pressure.