Flat roofing services
New Flat Roofs & Flat Roof Replacement
When a flat roof has reached the end of its life, a replacement done properly should be the last one you think about for decades. We strip back to a sound deck, upgrade the insulation to a warm roof, set the falls to clear water, and finish with a hot-air welded single ply or seamless liquid system, all backed by a manufacturer guarantee.
Signs your flat roof needs replacing
A flat roof can be repaired many times, but there comes a point where repairs are throwing good money after bad. The tell-tale signs are usually a combination: water ponding in dips long after rain, widespread splitting, blistering or bubbling, repeated leaks in different spots, and damp or staining appearing inside.
Age matters too. Old felt and asphalt roofs that are past 15 to 20 years old, especially if they have never had a proper warm-roof build-up, are often better replaced than patched. We give you an honest assessment at the survey, including how much life a repair might realistically buy.
What a full flat roof replacement involves
A proper replacement is more than a new covering. We strip the old roof back to the deck so we can see and make good the structure beneath, which is often where hidden damage is found. We then build the roof up as a warm roof: a vapour control layer, insulation to meet current Building Regulations, and the new waterproof membrane on top.
Crucially, we set the falls so water runs to the outlets instead of sitting on the roof, and we renew outlets, trims and detailing rather than reusing tired components. The result is a roof that performs as a complete system, not just a fresh skin over old problems.
Single ply or liquid: the right new roof for you
For most replacements, a hot-air welded single ply membrane is the long-life, best-value choice. Where a roof is small, heavily detailed, or has a lot of penetrations and awkward shapes, a cold-applied liquid system can be the better fit, curing into a seamless layer that follows every detail.
We are not tied to one answer. We specify whichever system suits your roof, its access and your budget, and explain the trade-offs clearly so you can decide with confidence.
Why choose us
What you get with Sureseal
Full strip & refit
Back to a sound deck, so hidden damage is found and made good, not covered over.
Warm roof to regulations
Upgraded insulation that meets current Building Regulations and keeps rooms warmer.
Falls designed in
Tapered build-ups set the falls so water clears to the outlets instead of ponding.
Choice of systems
Single ply or seamless liquid, specified to suit your roof rather than a one-size answer.
Systems & materials
What we install and use
Single ply membrane
Hot-air welded PVC or TPO from approved manufacturers, the standard choice for a long-life new roof.
Liquid waterproofing
Cold-applied PMMA or polyurethane for complex or heavily detailed roofs, cured into a seamless layer.
Warm roof insulation
Insulation to meet current Building Regulations, with tapered schemes to create proper falls.
New outlets, trims & detailing
Renewed rather than reused, so the whole roof performs as one watertight system.
Our process
What to expect
- 1
Free survey
We assess the existing roof, the deck and the falls, and confirm whether replacement is the right call.
- 2
Specification & quote
A fixed written quote with the system, insulation and guarantee set out clearly.
- 3
Strip & deck repair
We remove the old roof to the deck and make good any structural or timber damage.
- 4
Insulation & falls
A warm-roof build-up is installed with the falls set to clear standing water.
- 5
Membrane & detailing
The new membrane is laid and welded, outlets and trims renewed, and the roof signed off and guaranteed.
Frequently asked questions
Should I repair or replace my flat roof?
If the roof is leaking in several places, ponding, splitting and past 15 to 20 years old, replacement is usually the better value. If the problem is localised, a repair may buy useful years. We give an honest view at the survey.
Does a new flat roof need building regulations?
Replacing a significant area of flat roof triggers building regulations for thermal performance, which usually means upgrading the insulation to a warm roof. We design the build-up to comply.
How long does a flat roof replacement take?
A typical domestic replacement is completed in a few days, weather permitting. Larger or commercial roofs take longer and are programmed in advance.
How long will a new flat roof last?
A correctly installed single ply or liquid roof has a realistic service life of 25 to 35 years and carries a manufacturer guarantee of 20 years or more.
Can you replace the roof without disturbing the rooms below?
In most cases yes. We work from above and keep the roof watertight at each stage, so disruption inside is kept to a minimum.
Other flat roofing services
Commercial Flat Roofing
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 →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 →Liquid Roofing
Cold-applied, seamless PMMA and polyurethane waterproofing for balconies, complex roofs and heavy detailing.
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.