Flat Roof Repairs · York & Yorkshire
Ponding, splits, blistering, failed laps and leaking upstands, repaired with the correct system, correctly detailed. So the same fault doesn't reappear the first hard winter after we leave.
30+
Years trading
20+
Yrs owner experience
10
Employed roofers
2 hr
Emergency response
10 yr
Workmanship guarantee
What we do
Flat roof repair means fixing the specific failure mode without disturbing the sound membrane around it. That could be a targeted patch, a re-lapped seam, a new outlet, a reinforced upstand, or a decision to replace, because sometimes patching is the more expensive answer.
Homeowners with a leaking extension, garage or dormer, and landlords with recurring ceiling stains. Anyone who's already paid for one 'quick fix' that came back within a season.
The moment you see ponding that never dries, a blister raising like a mushroom, a moss line at a seam, or an interior stain. Left alone, a small failure becomes structural deck rot.
A patch that ignores the cause doesn't outlast the tube of mastic it came from. Real flat roof repair is diagnosis first, correct material second, detail third, and it's what the price-only jobs skip.
What happens if it's ignored
A roof issue left alone compounds quickly. Water tracks, timber rots, and repair scope escalates by season. Here's what we see when a customer waits.
Standing water doubles the thermal and UV load on a membrane. What starts as a discoloured patch becomes a soft, delaminated section by the following winter, and then a hole.
Air or moisture trapped between layers expands with temperature. Blisters don't self-heal; each thermal cycle grows the fault until the top layer splits.
Every failed seam is a straight-line entry point for water. On old felt roofs, the lap adhesive dries and lifts; on cheap EPDM, primer skipped at overlaps fails within 2–3 years.
A membrane can look fine while the OSB or ply beneath it is spongy. We always probe for a soft deck, because putting a new membrane over rot is money burned twice.
Our process
We come out promptly, walk the roof, probe the deck and photograph every detail. You get an honest read of whether it's repairable or whether replacement is the right call.
Every repair is priced against the actual failure, ponding, blister, seam, upstand, outlet, not a generic 'flat roof' job.
A written fixed-price quote within 6 hours landing the same day. Scope, materials, time and price, all set before we start.
We use system-compatible primers, tapes and membranes, no bitumen paint over EPDM, no silicone over felt. If it was fibreglass, it stays fibreglass; if it was EPDM, we bond in a matched sheet.
We water-test outlets and re-check upstands, then issue the 10-year written workmanship guarantee on completion.
Why homeowners pick us
Same-day inspections where possible and 2-hour emergency response for active leaks. Written quote back within 6 hours.
A correctly patched EPDM or fibreglass repair matches or beats the surrounding membrane's remaining life, we don't shortcut with mastic or silicone.
You get one clear written number. No 'while we're up here' extras once the deck is opened.
We refuse to lay new membrane over wet or soft deck. It's the single biggest cause of a re-failed flat roof, and it isn't a saving.
The full 10-year written workmanship guarantee applies to repairs as well as full installations.
For storm and impact damage we make-safe first, tarpaulins fixed correctly, gutters cleared, water contained, and permanent-repair after.
The detail
Not every flat roof failure needs a full replacement. Below are the most common issues we repair, and how we approach each one on domestic and light-commercial buildings across Yorkshire.
Where an existing roof holds water because the falls are inadequate, we install tapered insulation cuts under a fresh membrane to introduce a proper minimum 1:80 fall. This is more work than a like-for-like patch, but it's the only way to stop the ponding coming back with the next membrane.
On modern SBS felt, a blister is cut open in a cross pattern, the substrate dried, and a two-layer patch bonded and heat-sealed in. On EPDM, the affected sheet is peeled, primed and re-bonded with a matched piece extending 150mm beyond the fault in all directions.
Failed laps on felt are cut back, the substrate cleaned and dried, and a new torched-in lap formed with fresh adhesive. On EPDM, we clean, prime and re-tape the seam with system tape, never generic mastic.
Most flat roof leaks come from the edges. We re-form upstands to a minimum 150mm above finished level, dress fresh lead over the top edge, and fit pre-formed pipe collars and drainage sumps rather than field-cut circles. It's slower, and it's the reason the repair lasts.
Where the substrate is soft, we strip the affected area, replace with matched-thickness OSB3 or WBP ply screwed to firrings, and re-membrane. Where more than about 25% of the deck is soft, we recommend and price a full replacement instead, it's the cheaper answer honestly.
Domestic flat roof repairs are usually single-visit affairs completed inside a day. Commercial repairs on trafficked or plant-loaded roofs (air-con condensers, cable runs) need reinforced patches and often walk-boards, priced fixed, and phased outside your trading hours where possible.
FAQ
Small localised repairs (single split, blister, one seam) typically sit between £180–£450. Multi-fault repairs and upstand rework are usually £500–£1,200. Every job is quoted fixed in writing after inspection.
If the deck is dry and less than 20–25% of the covering is failing, a repair is almost always the right answer. If the deck is wet or blistering is widespread, replacement is cheaper long-term, we tell you honestly which category yours is in.
A correctly executed repair carries our full 10-year workmanship guarantee and, where system-compatible materials are used, matches the surrounding roof's remaining service life.
Not directly, different systems don't bond reliably. We either replace the entire covering with EPDM, or we repair felt with felt. We'll never mix systems on the same substrate as a shortcut.
Emergency response inside 2 hours day or night, with a make-safe on the spot and a permanent repair booked as soon as the weather allows.
Rarely, most single-storey extensions and garages are reached from proper ladders and towers. Second-storey dormer flat roofs and larger commercial repairs sometimes need scaffold; we include it in the quote when it's required.
System-compatible repairs using approved materials don't void the manufacturer warranty. We document what we've used so your warranty history stays clean.
Yes, we provide condition reports and photographs suitable for insurance submission and liaise with loss adjusters where you'd like us to.
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Ready when you are
Free survey. Written quote back within 6 hours. 10-year workmanship guarantee. No call-out fee, no pushy follow-ups.
