Onduline Roofing Derby | Installation & Repair Service

Onduline carries a
15-year waterproofing warranty when fitted and maintained to the manufacturer’s specification. It is
BBA certified, making it one of the few bitumen sheet products with independent third-party approval for use in the UK.

Onduline roofing is commonly used on:

• Garden sheds, summer houses, and home workshops
• Garages and carports
• Horse stables and animal shelters
• Agricultural buildings, barns, and farm outbuildings
• Lean-to extensions and covered walkways
• Chicken coops, kennels, and log stores
• Home offices and garden rooms

It is available in
black, green, red, and brown — so it can be matched to existing buildings or blended naturally into a garden setting.

The other common failure is
purlin spacing that is too wide. If the battens supporting the sheets are spaced further apart than the specification allows, the sheets flex under wind load and eventually crack along the corrugation. We see this regularly on older Derby garages and backyard stables — particularly on buildings put up by national shed companies that cut corners on the subframe.

Signs your Onduline installation may have been done incorrectly:

• Sheets bowing or sagging between supports
• Water dripping from large patches rather than a single point
• Nail heads visible on the sheet surface without washer caps
• Ridge piece lifting or separating at the ends
• Frost collecting on the underside of the sheets in winter

We carry out a
free roof inspection across Derby and Derbyshire. We tell you honestly whether a re-fix will solve the problem or whether the sheets need replacing.
No call-out fee. No pressure. Just straight answers.

Homeowners in Oakwood and Spondon with older garage roofs often ask whether Onduline is worth choosing over standard felt, EPDM rubber, or metal corrugated sheets. Here is a straight comparison:

Standard shed felt on a pitched roof typically needs replacing every
8 to 12 years. It splits along the laps, lifts in high winds, and deteriorates fast if there is any pooling. Onduline holds a 15-year waterproofing warranty and, when fitted correctly on a sound frame, regularly outlasts it. It does not peel, lift at the edges, or split in the cold.
Onduline is genuinely a ’fit and forget’ upgrade from felt — and it costs far less in the long run.

Compared to steel sheets, Onduline is
quieter in heavy rain, lighter to handle, and does not require the same condensation management that an uninsulated metal roof demands. It is also far less likely to draw planning objections on residential outbuildings in Derby, where
reflective metal sheeting can cause issues with neighbours and planning officers, particularly in tighter streets across Normanton and Spondon.

EPDM rubber is an excellent flat roof material — but it is
not designed for pitched outbuilding applications. If your garage or shed has a pitch, Onduline is the more practical choice. A properly qualified roofer installs Onduline faster than a rubber membrane system, with fewer joints and less risk of edge-seal failure on a pitched surface.

Onduvilla A bitumen roofing tile designed to
replicate the look of traditional clay or slate tiles. It suits garden rooms, home offices, and leisure buildings where appearance matters — particularly in areas like Allestree or Darley Abbey where a corrugated profile can look out of place next to the main house. Onduvilla offers the
same weather resistance as Classic in a far more discreet, attractive finish.

Onduline Easyline A compact version at 1m x 0.76m, designed for smaller DIY jobs — playhouses, log stores, lean-to canopies. On a full professional installation covering a garage or stable, we use Classic. Easyline requires more sheet joints on larger surfaces, which creates more potential leak points.

We advise you on the right product at the free survey stage.
If you already have Classic sheets and need replacements, we source matching sheets in the correct colour so your roof looks consistent.

Purlin Spacing At pitches over 15 degrees, purlins must be no more than
61cm apart. At lower pitches, tighter spacing is required. If your existing frame has purlins spaced wider than the spec, we add intermediate purlins before fitting the sheets.
This is a straightforward carpentry task — but it cannot be skipped, and many installation failures in Derby can be traced directly back to this single point.

Sheet Count and Material We calculate the exact number of sheets required, including side and end overlaps, ridge coverage, and verge allowances.
You get a precise, written, itemised sheet count before you commit to anything. No mid-job surprises.

Planning Considerations If you are in Breadsall, Borrowash, or anywhere in Derbyshire and planning a new outbuilding, permitted development rules may affect the permitted size and roof profile.
We flag any planning considerations at the survey stage, at no charge.

Once the frame is checked and the material is confirmed, our installation follows a precise sequence. We use
Onduline’s own branded fixings throughout — not cheaper hardware-store alternatives that void the waterproofing warranty.

Our Onduline installation process:

1. Fix verge elements to the sidewalls of the roof frame
   before any sheets are laid
2. Lay sheets from the bottom up, working away from the prevailing wind direction
3. End laps overlapped by a minimum of 17cm at pitches between 5–15 degrees; 15cm at steeper pitches
4. Side laps overlap by one full corrugation
5. Fix every corrugation at eaves, ridge, and overlaps using
   Onduline PP monobloc nails or Universal screws with washer caps correctly seated
6. Fix every second corrugation at intermediate purlins, in a staggered pattern
7. Fit the ridge piece to overlap sheets by at least 12cm,
   oriented against the prevailing wind
8. Fit apron flashing at all wall abutments using
   Onduline flexible apron pieces shaped precisely to the corrugation profile

We work across Derby, Long Eaton, and Ilkeston, including
tight-access sites where outbuildings sit close to fences or neighbouring boundaries. Our team works carefully in confined spaces and leaves every site clean. Sheet offcuts are removed and disposed of responsibly.

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Call 01332-529704 to book your free survey and receive a written, itemised quote before any work begins.

Fire Rating Onduline Classic
does not carry an External AA fire rating as standard. UK Building Regulations under Approved Document B require an AA-rated roof covering on certain building types — including structures positioned within one metre of a property boundary. If your garage or outbuilding sits close to a neighbouring property in areas like Normanton or Spondon, this matters.
The fix is not to replace the sheets — it is to apply an AA-rated surface treatment over them. We identify whether this applies at the survey stage and advise on the correct treatment.

Landlords and HMO Properties If you are a landlord with rental outbuildings or an HMO in Derby’s
DE1 postcode area, a written compliance check gives you documented evidence that your roof meets applicable standards. This is useful for
insurance claims, mortgage valuations, and local authority HMO inspections.

Third-Party Built Structures If a shed or stable manufacturer installed your Onduline roof and it has since failed,
you may have a legal claim against the original installer. We can produce a written inspection report describing exactly what was installed, what was done incorrectly, and what proper installation would look like. This gives you the documentation needed to pursue the matter formally.

Derby City Council building control follows Approved Document B. Conservation area properties in
Allestree and Darley Abbey face additional material conditions — we are familiar with both and can advise at the survey stage.

• Improve cross-ventilation inside the building — gaps at the eaves on opposite sides is the most effective fix
• Fit a ventilated batten layer below the sheets where the structure allows
• Reduce the moisture source inside the building — stored green timber, wet soil floors, and unventilated tools or machinery all contribute

Condensation does not mean your roof needs replacing. It means the building needs better airflow.
We assess this at inspection and give you practical, no-nonsense recommendations — not an unnecessary replacement quote.

Safe access and maintenance Onduline sheets are not designed for foot traffic. If you need to access your roof to clear moss, check fixings, or adjust a ridge —
you need a crawling board laid across the corrugations to spread your weight. Walking directly on the sheets will crack them. We show every customer the correct safe-access method before we leave a job.

Eco disposal Onduline sheets are made from
50–60% recycled material. At end of life, they can be taken to a licensed household waste recycling centre. They are not classified as hazardous waste — removal does not carry the restrictions associated with asbestos or treated timber.

Derby Roofers installs and repairs Onduline roofing
across Derby city and throughout Derbyshire. We carry no call-out fee across any of the following areas:

Derby City and Inner Suburbs

Wider Derbyshire

Not sure if we cover your area? Call 01332-529704 — if we can get to you, we will.

• Supply and fit of Onduline Classic corrugated bitumen sheets on garages, sheds, stables, and barns, fixed with the overlap and nailing pattern the product spec calls for at the roof’s actual pitch
• Onduvilla tile-profile sheets fitted where a slate or tile appearance is wanted, typically on outbuildings standing close to a house or where the roof needs to look the part
• Easyline sheets for smaller sheds and lower-cost outbuildings where a full Classic specification isn’t needed
• Ridge caps, eaves filler strips, and verge and flashing details fitted to manufacturer specification at every junction, not just along the main roof slope
• Replacement of individual cracked, split, or wind-lifted sheets without re-roofing the whole structure, provided the surrounding sheets and battens are still sound
• Re-fixing sheets that have worked loose from their original nails or screws, usually the result of the wrong fixing pattern at first install
• Extra battens fitted where existing purlin spacing is too wide for the sheet span, one of the most common reasons an older Onduline roof starts to sag or leak
• AA fire-rated surface treatment where a building’s proximity to a boundary requires it under Approved Document B, applied as part of the same visit rather than a separate call-out
• Timber batten and purlin repair or replacement where rot or woodworm is found once the old roof covering comes off
• Removal and disposal of old felt, corrugated iron, or existing Onduline sheets, so there’s nothing left over for you to skip away yourself
• Matching sheet colour and profile as closely as possible on repair jobs, since Onduline has been through more than one product generation over the years
• Free drone roof survey and written, itemised quote before booking, covering barns and taller buildings a ladder alone can’t safely inspect
• Checking and, where needed, replacing eaves fascia timber directly under the roofline where water has been tracking back off a worn sheet edge
• Advice on whether a repair or a full re-cover is the better long-term option for a roof that’s part-way through its working life, given plainly rather than defaulting to the bigger job

• Structural rebuilding of a collapsed or unsound timber frame - that needs a carpenter or builder first, before roofing work can start
• Removal of asbestos-cement sheets, which needs a licensed asbestos contractor and is quoted and arranged separately
• Guttering, fascia, and soffit replacement - can be arranged alongside the roof but priced as a separate item on the quote
• Planning permission or listed building consent applications, which stay with the property owner even where we can point out what a project needs
• Painting or staining of the existing timber structure once the roof is on
• Scaffold hire for exceptionally tall or long multi-bay barns where towers or powered access platforms aren’t practical for the span involved
• Solar panel or roof light fitting - can be priced alongside an Onduline job but is scoped and quoted as its own item
• Underfelt or breathable membrane upgrades beyond what the Onduline manufacturer spec calls for - available on request, priced as an addition rather than bundled in as standard

1. Free site visit and survey: We come out, or fly a drone over taller barns and multi-bay buildings, to check pitch, frame condition, purlin spacing, and access before quoting anything, since none of that can be judged accurately from a phone description alone. Where a stable block or field shelter has more than one roof needing attention, all of them get looked at on the same visit.
2. Written, itemised quote: A fixed price broken down by sheet type, quantity, battening, and any fire treatment needed, so nothing needs querying once work starts and there’s no reason for the figure to move once you’ve booked. A provisional start date is given alongside the price, so the two aren’t decided separately.
3. Strip and prepare: Old felt, sheeting, or damaged Onduline comes off, rotten battens and purlins are replaced, and extra battens go in wherever the existing spacing is too wide for the new sheet span, so the roof underneath is sound before anything new goes over it. This is also the stage where any rot found under the old covering gets dealt with rather than sheeted over.
4. Fit the new Onduline sheets: Sheets go on with the correct overlap and fixing pattern for the pitch, followed by ridge caps, eaves strips, and flashing at every junction, so water has nowhere to find a way in at the edges or around a chimney or vent. Fixings go through the overlap rather than the crown of the corrugation, which is the single most common point of failure on roofs we’re called out to repair.
5. Fire treatment where required: Where the building’s distance from a boundary calls for it under Approved Document B, the AA-rated treatment is applied during the same visit rather than scheduling a return trip.
6. Clear-down and final check: Offcuts, old materials, and packaging are taken away, and we walk the roof with you before calling the job finished, so any question gets answered on site rather than over the phone afterwards.

Repair pricing works differently to a full re-roof: a single sheet swap on a stable or field shelter is priced on the sheet, the fixings, and the time on the ladder or tower, not against the whole roof area, so a small repair job stays a small repair price rather than being quoted as if it were a re-cover. Having a rough idea of the roof’s age, the last time it was worked on, and whether the leak is a single sheet or spread across several bays helps the survey move faster on the day, though none of that is needed before booking - the site visit is what confirms it either way. Because pricing depends on pitch, access, frame condition, and product choice, we don’t quote blind over the phone — every job gets a free site visit and a written, itemised price before anything is booked, so you know exactly what you’re paying for and why, and what would change the figure if the survey turned up something the phone call couldn’t.

Timing has a small effect on price too, though not in the way people expect: booking a repair as soon as a sheet cracks or lifts is cheaper than waiting until a wet season has had a chance to get into the battens underneath, because at that point the job grows from a sheet swap into a carpentry repair plus a sheet swap. A garage or shed roof is usually the quickest and least expensive job on the list, a single stable or field shelter sits in the middle, and a multi-bay barn or a full farm building re-cover, particularly one needing a powered platform or tower for the whole roof, sits at the top end - but even that comparison is only a rough guide until the survey has actually measured the roof and checked the frame.

Barns, stables, and taller outbuildings bring their own access problem, and that’s where the team’s IPAF certification for powered access equipment and PASMA certification for mobile tower work earns its keep, covering most farm and equestrian roofs without a scaffold booking or a ladder taking the strain. That matters more on a working farm than it sounds: a scaffold booked for a single barn roof can sit for days waiting on a hire slot, while a tower or platform goes up the same morning the quote is agreed, which counts for something when a stable roof is actively letting water onto hay or feed stored underneath.

Onduline also behaves differently across a Derbyshire winter than it does in a showroom photo, and fixing detail is what decides whether that matters. A sheet nailed through the crown rather than the overlap will hold in dry weather and start leaking the first time wind-driven rain hits it side-on, which is a large part of why so many of our call-outs are repairs to someone else’s install rather than jobs on a roof we fitted originally. Every job still comes with a free inspection, a written itemised quote before anything is booked, and no call-out fee, and where a repair will genuinely fix the problem, we say so rather than pricing up a full re-roof.

Stables and field shelters also come with their own set of practical constraints that a straightforward house re-roof doesn’t - livestock underneath while work is going on, feed and bedding that needs to stay dry through the job, and gateways or yards that a scaffold tower would otherwise block for days. Working from a drone survey and a mobile tower rather than a full scaffold keeps a working yard usable while the roof itself is being fitted or repaired, which matters as much to most smallholding owners as the roof does.

The mix of city gardens and rural outbuildings means the same van carries fixings and battens sized for both a suburban shed roof and a barn gable, so a booking doesn’t need to wait for specialist stock to be ordered in. Equestrian yards and smallholdings toward Kedleston and Quarndon tend to bring several outbuildings on one site - a stable block, a field shelter, and a hay barn all needing different sheet counts and access - and those get surveyed and quoted together rather than as separate call-outs where that’s more practical for the owner. If you’re outside this list, ask - we cover most of Derbyshire and will say plainly if a job’s too far for a free visit to make sense.

Response time on a covered postcode is usually a matter of getting a survey booked in rather than a long wait, since the same team and van handle both the drone survey and the fitting work, and a barn roof with an active leak gets prioritised over routine jobs where that’s needed. Whether the address is a terraced garage in Derby city centre or a stable block on a smallholding past Brailsford, the same free survey, written quote, and certified access apply without a different process for rural jobs.

If you have read this far, you already know more about Onduline roofing than most people who call us — and that means you are in a great position to make a smart decision about your roof.

Whether you need a new Onduline roof fitted correctly from day one, or you have an existing roof that is leaking, sagging, or failing, we are the Derby team to call.

We have been working on roofs across Derby and Derbyshire for over 20 years. We know the local building stock, the local weather, and the mistakes that local shed companies make. We never recommend replacement when a repair will do. And we never start work without giving you a
free, written, itemised quote first.

📞 Call now: 01332-529704 Available Mon–Fri 7:30am–6:00pm | Sat 8:00am–4:00pm | Emergency cover 24/7

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Email: info@derbyroofers.co.uk

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Online: derbyroofers.co.uk/contact-derby-roofers

No call-out fee. Free survey. Free written quote. No obligation.

Your Onduline roof deserves to be done properly — call us today and let’s get it right.