Flat Roof Repairs
Stop the ponding. Seal it for good.
From pooling water to blistered felt, Corner Stone repairs flat roofs across Co Durham, Teesside & Tyne and Wear — traced to the true cause, fixed in writing, and backed by a 5-year workmanship warranty.
Years repairing roofs
Roofs completed
Repair warranty
Average review score
5-yr
Repair workmanship warranty
Flat roofs done right
A flat roof is only as good as its falls and seams.
Flat roofs fail where water is allowed to stand and where seams and upstands are left to weather. We trace every leak to its true source — a ponded deck, a blistered membrane, a failed flashing — use matching materials, and stand behind the work in writing so the same patch doesn’t fail in the next storm.
- Free flat roof survey with photo report — no obligation
- Fixed-price quote before any work starts
- Torch-on felt, EPDM, GRP and liquid overlay systems
- 5-year workmanship warranty on every repair
What we repair
Every common flat roof failure, put right.
One crew handles the whole flat roof — membrane, deck falls, outlets, flashings and upstands — so a repair never gets lost between contractors.
Ponding Water & Drainage
Flat roofs are meant to shed water, not hold it. We re-fall the deck, clear and renew outlets, and fix the low spots where rain pools — stopping the standing water that rots felt and blisters membranes.
Felt & Membrane Renewal
Sun, frost and age crack and blister built-up felt and single-ply membranes. We strip failed layers, dry the deck, and lay new torch-on felt or EPDM rubber to a seamless, weatherproof finish.
Blister & Split Repairs
Trapped moisture lifts felt into blisters; thermal movement opens splits at seams. We cut out the damaged section, bond in a matching patch, and seal the edges so the roof plane is whole again.
Flashings & Upstands
Where a flat roof meets a wall, parapet or skylight, the flashing does the heavy lifting. We dress new lead or GRP upstands, reseal abutments, and renew drips and trims to keep water out of the joint.
Storm & Emergency Cover
High winds tear felt, hail punctures membranes, and sudden downpours overwhelm blocked outlets. We make the roof safe fast, tarp where needed, and document everything for your insurer.
Overlay & Liquid Systems
Where the deck is sound, a cold-applied liquid or fibreglass (GRP) overlay can renew a tired flat roof without a full strip. We assess honestly and only overlay where it will truly last.
When to call
Six signs your flat roof needs a repair.
Spot any of these? Book a free survey before a small fix becomes interior damage. The sooner we look, the simpler the repair.
Book a Free Survey- 01Water pooling or still lying on the roof days after rain
- 02Blisters, bubbles or soft spongy patches underfoot
- 03Splits, tears or lifting at the felt seams and edges
- 04Damp patches, mould or brown stains on the ceiling below
- 05Daylight or draughts showing through the deck or upstands
- 06Felt looking cracked, brittle or covered in moss and debris
How it works
Four steps. One day, most repairs.
Free Flat Roof Survey
We inspect the deck, membrane, outlets and upstands, photograph every issue, and explain plainly what needs attention now and what can wait.
Honest Written Quote
A fixed-price repair proposal — materials, labour, and a firm date. We tell you if a patch will do, or if an overlay or renewal is the better spend.
The Repair
A dedicated crew, matching felt and lead kept on the van, and daily cleanup. Most flat roof repairs are completed in a single day.
Walkthrough & 5-Year Warranty
We show you the finished work, leave the site spotless, and register your 5-year repair warranty before we drive off.
Flat roof work
Repairs, documented.
A few recent flat roof repairs across Co Durham, Teesside & Tyne and Wear — every one photographed before and after, and warrantied in writing.
Felt & flashing renewal
Co Durham, Teesside & Tyne and Wear
Lead flashing upstand
Co Durham, Teesside & Tyne and Wear
Ponding water traced & fixed
Co Durham, Teesside & Tyne and Wear
EPDM rubber membrane
Teesside
Blister cut-out & patch
Co Durham
Torch-on felt renewal
Tyne and Wear
Word of mouth
Neighbours talk. Dry ceilings prove it.
“Our garage flat roof had been ponding for years and two firms wanted to replace it. Corner Stone re-fell’d the deck, renewed the outlets, and laid new torch-on felt — dry ever since and half the price we were quoted.”
“A storm peeled back a strip of felt above the extension. They were out the same morning, made it safe, and had a seamless patch and new flashing done by the next day. Spotless work.”
“Blistered felt on a dormer was leaking into the bedroom. They cut out the damage, bonded in a matching patch, and resealed the upstand — fair price, tidy crew, and the warranty is in writing.”
Straight answers
Flat roof questions, answered plainly.
Related roofing services
One crew for the whole roof — explore the rest.
Corner Stone Roofing & Maintenance handles every layer above your ceiling across County Durham, Tyne and Wear and Teesside. See how the rest of our roofing work fits together.
Free flat roof survey
Let’s find the real cause — on us.
Send the form and we’ll call within one business day to book your free roof survey. Active leak or storm damage? Call us straight away and we’ll make the roof safe.