Flat Roofing in Peterborough
Water standing on the garage roof after rain, a blister in the felt over the back extension, or a damp patch on the ceiling below a dormer. Tell us about the flat roof and we will pass it to a local roofing firm that repairs and replaces flat roofs across Peterborough.
What Flat Roofing Covers
- Repairs to splits, blisters and failed laps in felt roofs
- Full replacement in torch-on felt, GRP fibreglass or EPDM rubber
- Re-decking where the boards under the covering have gone soft
- New edge trims, upstands and flashings where the roof meets a wall
- Outlets, gutters and drainage so the water actually leaves the roof
- Insulation added during replacement, where it makes sense for the room below
Garage and Extension Flat Roofs
Across Peterborough's townships, many houses built in the 1970s and 80s came with a garage, a porch or a single-storey extension under a felted flat roof. Felt of that era was never expected to last forty or fifty years, and a lot of it is now well past its best. The problems tend to arrive in the same order:
Ponding. The deck sags a little, water collects in the dip and sits there after every shower. Standing water speeds up the wear on any covering.
Blisters and cracks. The felt dries out, loses its flexibility and cracks, or traps moisture that lifts it into blisters.
Failed edges and upstands. Where the roof meets the house wall, the flashing or upstand pulls away, and water runs down inside the wall rather than off the roof.
A soft deck. Once water has been getting in for a while, the chipboard or timber boards under the felt swell and rot. You can often feel it underfoot. At that point a patch on the surface will not hold, and the deck has to be replaced along with the covering.
Here is how the three main coverings compare in general terms:
Torch-on felt. Modern multi-layer felt systems are far tougher than the old single-layer roofs they replace. It is a familiar, economical choice for garages and a straightforward repair material.
GRP fibreglass. A jointless covering laid wet and cured in place, with neat moulded trims. It suits roofs that are walked on occasionally and gives a clean finish on an extension.
EPDM rubber. A single sheet of synthetic rubber with no joints across the roof. It copes well with movement and temperature change, and it is well suited to simple rectangular garage and extension roofs.
Which is right depends on the roof's size and shape, how it is used, and what is underneath. A good roofer will explain why they are recommending one over another. Our guide to flat roof replacement cost compares all three by researched 2026 price and expected lifespan.
Signs a Flat Roof Needs Attention
- Water still standing on the roof a day after rain
- Cracks, splits or blisters in the surface
- A damp patch or mould on the ceiling underneath
- Edge trims or flashings coming away from the wall
- A spongy feel when you press on the deck
- Moss or plants growing on the roof
Flat Roofs on Older Houses
Not every flat roof in Peterborough is on a garage. In the older streets of Millfield, New England, Fletton and Woodston, flat roofs cover bay windows, back additions and dormers, and some older properties have small areas of lead. These are usually tighter and fiddlier to work on than a garage, with more junctions to seal, and a leak there often shows well away from where it gets in.
What Changes the Price
The size of the roof. Most coverings are priced by area, but small roofs cost more per square metre because setting up takes the same time whatever the size.
The state of the deck. If the boards are sound, the new covering goes over a prepared surface. If they have rotted, they come off and new decking goes on first, which adds materials and labour.
The covering chosen. Felt, GRP and EPDM differ in material cost, labour and lifespan.
Access and edges. A garage roof reached from the drive is simpler than an extension roof above a conservatory or next door's fence. Upstands against walls and extra outlets add work.
Insulation. Adding insulation during a replacement makes the room below warmer, but it raises the roof level and changes the edge detailing.
See our guide to flat roof replacement cost for researched 2026 UK ranges.
How It Works
Tell us what the flat roof is doing and roughly how big it is. We pass your enquiry to a roofing firm covering your part of Peterborough, and they arrange to see it and quote. The roofing is done by that firm, not by us, and we do not inspect or approve them. It costs you nothing and commits you to nothing.
Related Services
If the main roof is failing too, roof replacement explains a full re-roof. Gutters and fascias around a flat roof are covered on guttering, fascias and soffits, and moss on a flat roof is often a roof cleaning job first.
Areas We Cover
Flat roofing across Bretton, Orton, Werrington, Paston, Stanground, Hampton, the older city streets, Yaxley, Whittlesey, the Deepings, Spalding, Wisbech and Huntingdon. see all service areas
Common Questions
Does a leaking flat roof always need replacing?
No. If the damage is limited to one area and the deck underneath is sound, a repair is often enough. If the covering is failing in several places, or the deck has gone soft, replacement is usually better value than a repair that will not last.
Which is better for a garage, felt, GRP or EPDM?
All three work well when properly installed. EPDM and GRP give jointless coverings; modern torch-on felt is a familiar and economical option. The right choice depends on the roof's size, shape and use, and the roofer should explain their recommendation.
How long does a new flat roof take?
A single garage is usually a day or two, depending on the weather and whether the deck needs replacing. Most flat roof coverings need dry conditions to be laid properly.
Flat Roofing Quotes in Peterborough
Give us your postcode and a line about the problem. A roofer who works your part of Peterborough will arrange a visit and a price.