Flat Roof Repair and Replacement in Bristol
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Flat Roofs That Stay Watertight
Flat roofs are everywhere in Bristol: rear kitchen extensions, garages, bay windows, loft dormers and the backs of countless terraced houses. They are also one of the most common sources of leaks we see, because old felt cracks, blisters and lets water sit in puddles until it finds a way in.
We carry out flat roof repair in Bristol on felt, EPDM rubber and GRP fibreglass roofs. Where a repair will hold, we fix it. Where the roof has had its day, we strip it back to the deck, replace any soft boards and fit a new system that is built to last.
Every job starts with a proper look at the roof, including the edges, upstands and outlets where most problems begin. You get a written quote before any work starts.
Common Flat Roof Problems
Flat roofs tend to fail in the same few ways. If you spot any of these, it is worth getting the roof checked:
- Puddles that are still there days after rain
- Cracks, splits or blisters in the felt
- Damp patches on the ceiling below
- Soft or spongy spots when the deck is walked on
- Lifting edges, trims or upstands
- Moss and plants growing on the surface
Rear extensions on the terraces of Bishopston, Horfield and Easton often have felt roofs that are 20 years old or more. Loft dormers in Redland and Southville are another hot spot, because the flat roof meets tiles or slate and the join needs good lead flashing to stay dry.
Getting the fall right matters as much as the material. A flat roof is never truly flat. It needs a gentle slope to carry water into the gutter, and many failed roofs we see were laid too flat in the first place. When we replace a roof, we correct the fall so water runs off instead of sitting there.
Expert Advice
Why Flat Roofs Fail
Most flat roof failures come down to a few causes. Old single-layer felt becomes brittle and cracks. Water ponds where the roof has too little fall, speeding up wear. Edges, upstands and outlets are disturbed by movement and weather. The timber deck underneath rots once water gets in, making the roof soft underfoot. Understanding which of these is happening tells us whether a repair will last or whether the roof needs replacing.
Warm, Cold and Inverted Roofs
Flat roofs are built in three main ways. In a cold roof, insulation sits between the joists below the deck and the void needs ventilating. In a warm roof, insulation sits on top of the deck with the waterproofing above it, which keeps the structure warm and reduces condensation risk. In an inverted roof, the insulation sits above the waterproofing. When a flat roof is replaced, we usually recommend a warm roof build-up, and Approved Document L may require insulation to be upgraded anyway.
Getting the Details Right
A flat roof should never be truly flat. A gentle fall carries water to the gutter or outlet. Upstands where the roof meets a wall need to be high enough and properly sealed, usually with lead or a compatible flashing. Trims and drip edges must throw water clear of the fascia. These details matter more than the choice between EPDM, GRP or felt.
EPDM, GRP or Felt: Choosing the Right Flat Roof
The right material depends on the size and shape of the roof, how it is used and your budget. We explain the options honestly so you can choose what suits you.
- EPDM rubber: a single sheet with no joints on most domestic roofs, flexible in cold weather and very low maintenance.
- GRP fibreglass: a hard, seamless finish that copes well with foot traffic, ideal for balconies and complex shapes.
- Torch-on felt: modern multi-layer felt is far tougher than the old single layer roofs and suits some larger roofs.
- Repair first: if the deck is sound and the damage is limited, a targeted repair can add years to the roof.
Flat Roof Repairs Across Bristol
We repair and replace flat roofs across the city, including Bedminster, Kingswood, Fishponds, Brislington, Henleaze, Clifton and Totterdown.
If your flat roof is leaking right now, call us about an emergency roof repair. If the problem is on a pitched roof instead, see our roof leak repair page.
Compare every flat roof system in detail: EPDM rubber roofing, GRP fibreglass roofing, felt roofing, liquid roofing, single ply, mastic asphalt and green roofs. We repair and install flat roofs on homes and commercial buildings across Bristol and Bath, see residential roofing and commercial roofing.
Flat Roof Reviews From Bristol and Bath Customers
Our authenticity promise: we only publish genuine reviews from real customers, with their permission. Every review shown here will include the customer’s first name, their area, the work carried out, the date and where the review was left. We never write, buy, edit or pay for reviews.
Reviews from customers who have had flat roof repair and replacement work carried out across Bristol and Bath will appear here as jobs are completed. If we have worked on your roof, we would love to hear how it went.
Flat Roof Repair FAQs
How long does a flat roof last?
Old single layer felt often lasts 10 to 15 years. A well fitted EPDM or GRP roof can last 25 years or more with very little maintenance, which is why most people choose one of these when they replace.
Can a flat roof be repaired or does it need replacing?
If the deck underneath is sound and the damage is limited to one area, a repair is often enough. If the roof is leaking in several places, holding water or feels soft underfoot, replacement is usually better value.
Is EPDM or GRP better?
Both are excellent. EPDM is a rubber membrane that is quick to fit and very durable. GRP gives a hard, seamless finish that copes well with foot traffic. We recommend the one that suits your roof best.
How much does a new flat roof cost in Bristol?
It depends on the size, the material and whether the deck needs replacing. A small garage roof costs far less than a large extension.
How long does it take to replace a flat roof?
Most domestic flat roofs on extensions, garages and dormers are replaced in one to three days, weather permitting.
Why is water pooling on my flat roof?
Pooling, often called ponding, usually means the roof does not have enough fall or the deck has started to sag. It speeds up wear and is a common cause of leaks, so it is worth getting looked at.
Do I need building regulations approval to replace a flat roof?
Often, yes. Replacing a flat roof covering usually counts as renovating a thermal element, so Approved Document L may require the insulation to be upgraded. The work then needs building control approval unless the contractor can self-certify it through a competent person scheme.
Could my garage roof contain asbestos?
It could. Asbestos cement sheets were widely used on garages and outbuildings until asbestos was banned in the UK in 1999. Do not drill, cut or break an old sheet roof. It should be tested first and handled under the Control of Asbestos Regulations 2012.
Why Choose Us for Your Flat Roof
Flat roofs are unforgiving. Small mistakes at the edges and outlets turn into leaks within a year or two. We take the time to get the details right, from the deck and the fall to the trims and upstands.
- Honest advice on repair versus replacement
- EPDM, GRP and felt systems to suit the job
- Decks checked and soft boards replaced
- Clear written quotes before work starts