Flat Roofing
Flat Roofing Specialistsin Colne, Backed by a25-Year Product Guarantee.
Replace the flat roof that keeps pooling and leaking with a modern system built to shed water, and covered by a 25-year manufacturer product guarantee.
- 25 years' experience
- 5.0 Google rating
- £5m public liability
- Checkatrade member
- 24/7 emergency callouts
The service
Modern flat roofs that actually stay dry
Flat roofing covers the roofs of extensions, garages, dormers, porches and bay windows. A new flat roof means removing the old covering, checking the deck and joists, correcting falls so water drains, and laying a modern waterproof system with proper edge trims and upstands.
It's for homeowners whose flat roof is blistering, cracking, pooling water or leaking into the room below, often an old felt roof that's done 15–20 years and is now failing. It's also needed for new extensions and dormer conversions.
Flat roofs have a reputation for leaking, but that's usually down to old materials and poor installation rather than flat roofs themselves. Getting the falls, deck and detailing right is what makes the difference, and our flat roofs are covered by a 25-year manufacturer product guarantee.
Why it matters
What happens when a flat roof is left
Water that ponds on a flat roof finds every weakness. Once it gets through the covering it soaks into the timber deck, which swells and rots. The ceiling below stains, sags and eventually fails.
Because the deck sits right under the covering, a leak left for a winter often means replacing the whole deck rather than just the surface: a far bigger job than catching it early.
Patching old felt with more felt or bitumen paint rarely lasts more than a season or two.
Common mistakes to avoid
- Re-covering over a soft or rotten deck.
- Ignoring ponding water: it means the falls are wrong.
- Choosing the cheapest felt system for a roof you want to last.
- Forgetting the edges and upstands, where most flat roof leaks start.
Our process
How we handle your flat roofing
- 01
Inspection
We check the covering, deck, falls, edges and the ceiling below for signs of water damage.
- 02
Quote and system choice
We explain the right system for your roof and give you an accurate written quote.
- 03
Strip and deck
The old covering comes off and the deck is checked. Rotten boards are replaced and falls corrected.
- 04
New roof system
The new waterproof covering is laid with properly formed upstands, trims and outlets.
- 05
Completion
Final checks, site cleared, and your 25-year manufacturer product guarantee details handed over.
What you get
The benefits, in plain terms
25-year product guarantee
Our flat roofs are covered by a 25-year manufacturer-backed product guarantee.
No more ponding
Falls corrected so water drains off instead of sitting on the roof.
Sound deck underneath
We check and replace rotten decking rather than covering over it.
Clean finish
Neat edge trims and upstands that look tidy and keep water out.
Fits with a re-roof
Customers like Thomas Eastwood had a full re-roof and new flat roof done together.
Fully insured
£5m public liability plus employer's liability.
In detail
Flat roofing systems and where they're used
Different flat roofs suit different jobs. We'll recommend the right one for yours.
Rubber (EPDM) roofing
EPDM is a single sheet of synthetic rubber laid over the deck, with very few joins. It's flexible, handles temperature changes well, and suits garages, extensions and dormers.
GRP fibreglass roofing
GRP is a resin and glass-fibre system laid on site, curing into a hard, seamless surface. It's popular for extensions and areas that see light foot traffic, and can be finished in a choice of colours.
Torch-on and modern felt systems
Modern multi-layer felt systems are far more durable than the felt of decades ago. They remain a sound choice in the right situation, particularly on larger roofs.
Extensions, garages and dormers
Single-storey extensions and garages are the most common flat roofs we replace. Dormers need particular care where the flat roof meets the main pitched roof, as this junction is a frequent leak point. We dress these details with lead or system-specific upstands.
Getting the falls and drainage right
No flat roof is truly flat: it needs a gentle fall so water runs to a gutter or outlet. Many older flat roofs were laid with barely any fall, or the deck has sagged over time, leaving puddles that sit for days. Standing water speeds up wear on any covering. When we replace a flat roof, we check the falls and correct them with tapered firrings or a new deck where needed, so water drains off rather than sitting on top.
Insulating a flat roof
Older flat roofs often have little or no insulation, making the room below cold in winter and hot in summer. Replacing the roof is an opportunity to improve this. Depending on the construction, insulation can be added above the deck (a 'warm roof') to keep the timber at room temperature and reduce condensation risk. We'll explain what's possible for your roof and what building regulations require when replacing a flat roof.
Flat roofs on dormers and loft conversions
Dormer roofs are small, high up and exposed, and the junction where the dormer meets the main pitched roof is one of the most common leak points on any house. When we re-cover a dormer we pay particular attention to the upstands, the edge trims and the lead or system flashings where it ties into the slate or tiles around it. Getting these details right matters more than the covering itself, because that's where water tries to get in first.
Working with Vertex
What it's like to work with us
Vertex Roofing Group is a roofing company based at Emmott Court in Colne. Brendan O'Hanlon founded the business in 2017 after years on the tools, and today a team of six carries out every flat roofing job we take on. You deal with the people doing the work, not a call centre.
Every job starts with a proper inspection. You get a written quote based on what we've actually seen, and if something unexpected turns up once work begins, we show you photographs and agree it with you before anything changes.
Staged payments on larger jobs
On larger projects such as roof replacements, you pay in four 25% stages: to book, when materials and scaffolding arrive, at the halfway point, and on completion and sign-off. You never pay too far ahead of the work.
Insured and reviewed
We hold £5 million public liability insurance and employer's liability cover, we're a Checkatrade member, and we're rated 5.0 on Google by customers across Lancashire and Yorkshire.
How much does a new flat roof cost?
It depends on size, system and the condition of the deck. We inspect first and give you an accurate written quote.
What guarantee comes with a flat roof?
Our flat roofs are covered by a 25-year manufacturer product guarantee.
How long does a flat roof take to replace?
Most garage and extension roofs are completed in a day or two, weather permitting. Larger roofs or deck replacement take longer.
Which is better, EPDM or GRP?
Both perform well. EPDM is flexible with very few joins; GRP is hard-wearing and seamless. We'll recommend based on your roof.
Can you lay a new flat roof over the old one?
We don't recommend it. Covering over a damp or rotten deck traps moisture and shortens the new roof's life.
Why is water pooling on my flat roof?
Usually because the falls are inadequate or the deck has sagged. We correct the falls when we replace the roof.
Can a flat roof take solar panels?
Yes, on angled frames, provided the covering is in good condition.
Do you cover my area for flat roofing?
We cover Lancashire and Yorkshire, plus Kendal and the Lake District.
How long does a new flat roof last?
A modern system that's correctly installed on a sound deck is built to last for many years, and our flat roofs are covered by a 25-year manufacturer product guarantee.
Do you replace dormer and garage roofs?
Yes. Garages, single-storey extensions, dormers, porches and bay roofs make up most of the flat roofs we replace.
Related services
Get a flat roof that drains, lasts and doesn't leak.
Book an inspection and get an accurate quote for your extension, garage or dormer.
Your next step is simple. Request an estimate or call us, and we'll arrange a time to inspect your roof. You'll see what we find, get an honest recommendation on your flat roofing, and receive an accurate written quote. There's no obligation and no pressure: just clear information from a local team based in Colne who cover Lancashire, Yorkshire, Kendal and the Lake District.
£5m insured · Staged payments · 5.0 on Google