Flat Roof Repairs · Coulsdon CR5
Flat Roof Repairs In Coulsdon
Is the flat bit of your Coulsdon house the part that keeps getting wet?
Felt, rubber and fibreglass repairs to extensions, garages and bay tops on both sides of the valley
Walk along Marlpit Lane or up Chipstead Valley Road and count the flat roofs. There is the obvious one on the back extension, usually a garage with another, and on a lot of 1930s semis a small flat top sits over the bay with a lead or felt skin you have probably never seen. Every one of them was laid by a different builder in a different decade. Up towards Farthing Downs and Coulsdon Woods they take the weather head on. Down in the valley they collect leaves and grit from everything above. Either way, the leak tends to start where the flat roof meets a wall, and that is the first place we look.
Flat Roof Repairs quote in Coulsdon
Four details and somebody will come and look at it. There is no charge for the visit, no obligation afterwards, and if the answer is that your roof is fine, that is what you will be told.
The people behind it
Who looks at your flat roof
A Coulsdon extension or garage roof is usually a small job, and it is still priced by the people who own the firm. Roof Repairs Croydon is a family business run by John and Mark, who are brothers and have always worked side by side.
They often sit down with the numbers together before a quote goes out. Afterwards you have two names to ring, and whichever brother answers will know where your roof is up to.
1,000+
Roofs put right
10 year
Written workmanship guarantee
£0
To have somebody come and look
Repair first
Replacement is the last resort
Signs a Coulsdon flat roof is on the way out
You can usually see the early warnings from an upstairs window or a stepladder. Here is what they tend to mean on the kind of roofs this town has.
Damp at the top of the bay, under the front bedroom window
The flat top over the bay has lost its seal against the main wall. The covering may be fine. The flashing above it usually is not, and water running down the brickwork is being fed straight in behind it.
Grit gathering in one corner of the extension roof
Water is draining towards that corner and sitting there long enough to drop what it carries. The fall is wrong, or the outlet is too high, and the covering in that corner will go first.
Garage roof sagging between the walls
Old chipboard decks swell once they get wet and then droop. A garage roof that dips in the middle is often a deck problem with a covering problem on top.
Felt lifting along the front edge
Wind getting under the drip edge. On the exposed roads below the downs this is common, especially where the edge trim was nailed rather than bonded.
What you get when we look at a flat roof in Coulsdon
The small roofs get checked too
If you ring about the extension, we will still look at the bay top and the porch. They are cheap to check while we are there, and they are often the actual source of the damp.
Falls measured, not guessed
A level and a bucket of water tell us where your roof drains. That decides whether a repair will last or whether the deck needs firring before anything new goes down.
Edges fixed for the hill
On houses that face the downs we bond and mechanically fix the trims. A loose front edge is how a lot of flat roofs up there get peeled back in a gale.
A choice of covering explained
Torch-on felt, EPDM rubber or GRP. You hear what each costs on your roof and how long it should last, then you choose.
Rotten boards replaced before re-covering
We lift a section and look. Putting a new membrane on a wet deck is a waste of your money, and it is the kind of corner that gets cut when nobody checks.
Ten years in writing
Our workmanship guarantee covers the repair, and it is handed to you on the day the job is signed off.
Why flat roofs in Coulsdon fail the way they do
The interwar builders who filled the valley sides did not expect anyone to live under a flat roof. Their flat roofs were small: a bay top, a porch, maybe a coal store. The big ones came later, when families added kitchens and garages at the back, and the quality of those depends entirely on who built them. Some have a proper fall and a decent deck. Some were laid dead level in a weekend.
Then there is the height. Coulsdon is chalk downland with a deep valley cut through it, and the roads that climb out of it are properly exposed. A flat roof on the Farthing Downs side gets wind under its edges and rain driven against its upstands. One at the bottom of the valley is more sheltered but catches the leaf litter and silt coming off the gardens above, which blocks outlets and keeps the surface wet for longer.
"When a Coulsdon flat roof is leaking, the upstand against the house wall is the culprit far more often than a hole in the middle."
From flat roof repairs enquiries in Coulsdon handled by Roof Repairs Croydon
How we repair a flat roof in Coulsdon
Tell us where the water appears
Kitchen ceiling, garage wall, top of the bay. A photo from an upstairs window is useful too, because it shows us the whole roof surface before we arrive.
We get up there and look
The visit is free. We check the covering, the upstands, the outlet and the edge trims, then look at the ceiling underneath for staining patterns.
We test the deck
Soft spots underfoot, a moisture reading or a small cut-out tell us whether the boards are sound. That decides between a repair and a re-cover.
You get a written price
Repair and re-cover options set out separately where both make sense. Any firring to correct the fall is listed as its own item.
The work
Failed covering stripped back to sound material, wet boards replaced, falls corrected, and new upstands dressed up the wall and sealed under a flashing.
Hose test and handover
Where it is safe to, we run water over the finished roof to watch it drain. Then you get photos and the ten year guarantee.
The 10 year guarantee, and why it is safe to offer
Promising a roof will stay dry is easy. What counts is what happens if it does not. Work booked through Roof Repairs Croydon carries a 10 year workmanship guarantee, on paper, handed to you on the day and written in language you can actually read. The slates, tiles, lead, mortar, membranes and rainwater goods carry their own manufacturer cover on top of that. It varies by product, so you get told which cover applies to your job rather than one headline number that would be wrong on most of them.
Here is the reason a guarantee like that is not a risk. Repairs come back for one reason above all others: the fault was never found in the first place. Somebody went up, saw a stain on the ceiling below, mended whatever looked worst directly above it, and left. Water does not cooperate with that approach. It lands on a slate, runs under it, drops onto a rafter and travels along the rafter before it finds anywhere to fall. On a wide hipped roof in Sanderstead or Shirley that can be five metres from where it came in.
Find the entry point and the repair holds for years. Miss it and no amount of guarantee wording helps anybody. That is why the survey happens before the price, and it is why, if the same water finds its way back into your house inside the guarantee period, putting it right costs you nothing.
10 year
Workmanship guarantee
1,000+
Roofs put right
Covered
Public liability insurance
Per product
Maker's own warranty
What to ask before anyone touches your flat roof
Where does the water go now?
Ask them to show you. If they cannot say where the roof drains and where it ponds, they have not looked closely enough to quote you properly.
What happens at the house wall?
The upstand and flashing are where Coulsdon extensions leak most. A good quote says how high the covering goes up the wall and what seals the top of it.
Have they priced the deck?
A quote that ignores the boards can grow on the day. Ask whether they have checked the deck and what it costs if some of it needs replacing.
Patch it, or re-cover it?
Both are reasonable, depending on the age of the roof and the state of the deck. This is how the two compare on a typical Coulsdon extension or garage.
| Comparison point | Targeted repair | Full re-cover |
|---|---|---|
| Best for | A sound roof with one failed detail | A tired covering or a wet deck |
| Typical time on site | Often half a day to a day | Usually one to three days |
| Fixes ponding | No, unless it is a blocked outlet | Yes, if the deck is firred to a fall |
| Deck replaced | Only small sections | Any soft boards across the whole roof |
| Cost | Lower | Higher, but it resets the clock |
| Building regs | Not usually involved | May apply if over a quarter is renewed |
While you are looking up
Plenty of Coulsdon semis still have their original stacks, and a stack that is letting water in can soak the same ceiling a flat roof gets blamed for. If you are not sure which it is, read our page on chimney repairs in Coulsdon or just ask us to check both on the same visit.
What a flat roof repair costs in Coulsdon
There is no fair single figure. A resealed upstand on a bay top and a re-covered double garage are completely different jobs. These are the things that move your price.
How much of the deck has rotted
You only find out once a section is lifted. A few boards are a small extra. A whole deck changes the job.
Where on the valley you live
Houses off Chipstead Valley Road and down by Marlpit Lane are sheltered, but their outlets fill with silt off the gardens above. Up near Farthing Downs and Coulsdon Woods the edges need extra fixing against the wind. Each adds different work.
Getting to the roof
A garage on a level drive is easy. An extension reached through a stepped back garden on a valley side may need a tower, which is priced as its own line.
Flat Roof Repairs in Coulsdon: questions
Do I need planning permission to re-cover a flat roof in Coulsdon?
Usually not. Coulsdon is in the London Borough of Croydon, despite the Surrey feel, and re-covering a flat roof like for like does not need an application. Bradmore Green in Old Coulsdon is a conservation area, so if you want to change how a roof looks there, speak to Croydon Council first. If more than a quarter of a roof is being renewed, building regulations may require the insulation to be brought up to current standards, and we will tell you if that applies.
Why does the flat roof over my bay window leak?
Most often it is not the flat top itself. It is the joint where the bay meets the main wall. All the rain running down the front of the house hits that line, and once the old mortar or lead cracks, it goes straight into the bay. We reseal or replace that flashing and check the covering while we are up there.
Does living high up on the Coulsdon valley side affect a flat roof?
Yes. Houses on the roads climbing towards Farthing Downs and Coulsdon Woods get much more wind. That lifts flat roof edges, peels felt back from the trim and drives rain at the upstands. We bond and mechanically fix the edges on those houses. Lower down the valley the bigger problem is debris from gardens and trees blocking outlets.
Felt, rubber or fibreglass for a Coulsdon garage roof?
It depends on the shape and how long you want it to last. EPDM rubber is a good single sheet for a plain rectangle. Torch-on felt is cheaper and handles awkward corners well. GRP suits roofs that get walked on. We explain the trade-offs on your actual roof and let you pick.
Can you repair a flat roof in winter?
Repairs, yes, on dry days. Some membranes and adhesives need a minimum temperature to bond properly, so a full re-cover may wait for a mild spell. In the meantime we can make the roof watertight so it does not get worse.
What Croydon homeowners say
From roads across the borough, once the ladders had gone.
"Damp patch on our landing ceiling for about three years. Two roofers had been out and both mended the tiles directly above it, and neither made the slightest difference. This chap spent twenty minutes in the loft with a torch before he even went outside, then showed me a photo of a split in the lead in the valley about four metres away from the stain. Fixed it in a morning. Three winters on and nothing."
"Water was coming down the front bedroom wall every time it rained hard and I had convinced myself the roof was finished. It was the gutter. Half of it had dropped so the water was sitting in the middle and going over the front rather than down the pipe. He reset the brackets and cleared the gully, charged me a fraction of what I had budgeted for, and told me the roof itself had years left. Could easily have sold me a new one."
"Ours is in the Chatsworth Road conservation area and I had no idea the rules on roof work here are stricter than the rest of Croydon. He knew straight away, explained what I could and could not do without an application, and did the repair in matching slate. That saved me a very awkward conversation with the council later on."
"Lost most of the ridge tiles along the back in a February gale. Rang in the morning, sheeted the same afternoon so the weather could not get in, came back the following week when it was dry and rebedded the whole ridge properly. Sent me photos of everything for the insurance without me even asking. The bill was exactly what the quote said it would be."
"Gutters had been overflowing under the trees for years and the fascia behind them had gone soft. What I appreciated was that he explained why the timber had rotted rather than just quoting to replace it, and pointed out the new soffits needed vents or I would end up with condensation in the loft instead. Nobody had ever mentioned that to me before."
Had us out to your roof?
Two minutes writing a review does more for a small local firm than any amount of advertising, and it helps the next person in Croydon work out who to ring.
Things to do in Coulsdon
Three places worth seeing in and around Coulsdon when the roof is sorted.
Farthing Downs
Open chalk downland on the ridge above the town, looked after by the City of London Corporation, with Anglo-Saxon burial mounds and long views in every direction.
View on Google Maps - Farthing Downs
Happy Valley Park
A big dry valley next to Farthing Downs, mostly protected as an SSSI, where the chalk grassland flowers well and around a dozen kinds of orchid turn up.
View on Google Maps - Happy Valley Park
St John the Evangelist, Old Coulsdon
Old Coulsdon's Grade I listed parish church, largely thirteenth century, built of Reigate stone and flint and standing in the Bradmore Green conservation area.
View on Google Maps - St John the Evangelist, Old CoulsdonCoulsdon on the map
Coulsdon is about 12 minutes from us in South Croydon. It sits inside the London Borough of Croydon, so that is the council for any planning or building control question.
Areas we cover
Flat roofs are the same problem all over the borough and just over its edges, so we cover every town below as well as Coulsdon.
Flat Roof Repairs by town
Flat roof letting water in somewhere in Coulsdon?
Send a photo from upstairs or just ring and describe it. We come out free, check the bay tops and the porch as well as the roof you called about, and give you a fixed written price.