A leaking shed roof does not always need a complete replacement. Where the damage is small and the timber underneath remains sound, a repair kit may provide a practical and affordable solution.
UK homeowners can buy kits for traditional roofing felt, EPDM rubber, GRP fibreglass and corrugated roof sheets. Some contain only a patch and adhesive, while others include enough material to replace the entire covering on a small shed.
Choosing the right product matters. A felt patch will not bond properly to every rubber membrane, while a general-purpose sealant may provide little more than temporary protection over rotten boards or a badly split roof.
This guide explains the main types of shed roof repair kits, what they contain, where to buy them in the UK and when it makes more sense to replace the shed roof or hire a professional.
What Is a Shed Roof Repair Kit?
A shed roof repair kit is a collection of materials intended to repair or replace part of a garden building roof.
Depending on the product, a kit may contain:
- Roofing membrane
- Felt patching material
- EPDM rubber patch
- Fibreglass matting
- Resin
- Topcoat
- Adhesive
- Primer
- Sealant
- Repair tape
- Disposable brush
- Application roller
- Gloves
- Mixing container
- Roofing nails
- Edge trims
- Installation instructions
Some products described as repair kits are intended for one small split or puncture. Others are complete roof-covering packages sized for common sheds such as 6ft × 4ft or 8ft × 6ft.
Before ordering, check whether the product is a local patch kit, an emergency coating or a complete replacement system.
Types of Shed Roof Repair Kit
| Repair kit type | Best suited to | Typical contents |
|---|---|---|
| Felt patch kit | Small tears and holes in roofing felt | Self-adhesive patch or felt piece |
| Felt repair paint | Fine cracks and worn felt surfaces | Brush-on bituminous coating |
| Flashing tape | Split edges, seams and short-term repairs | Self-adhesive waterproof tape |
| EPDM patch kit | Cuts and punctures in rubber roofing | EPDM patch, primer and adhesive |
| Complete EPDM kit | Replacing the full shed covering | Rubber membrane, adhesive and sealant |
| GRP repair kit | Cracks and holes in fibreglass roofs | Resin, matting, catalyst and topcoat |
| Liquid repair kit | Emergency repairs across several materials | Reinforced liquid coating |
| Corrugated sheet repair kit | Small holes around sheets or fixings | Repair tape, sealant or replacement fixings |
| Complete felt kit | Re-covering a small or medium shed | Felt roll, adhesive and fixings |
Repair Kit or Full Roof Kit?
These products serve different purposes.
Local repair kit
A local kit covers a limited damaged area. It may suit:
- One small tear
- An isolated puncture
- A lifted seam
- A crack in GRP
- Damage around one fixing
- An emergency leak
Complete roof kit
A complete kit replaces most or all of the shed roof covering. It may include a pre-cut membrane and enough adhesive for a stated shed size.
Complete EPDM shed kits are currently sold in standard and made-to-measure sizes by specialist suppliers. Screwfix also lists garden-building EPDM kits in sizes for pent and apex roofs, although individual sizes may move in and out of stock.
Which Kit Do You Need?
Start by identifying the existing roof material.
| Existing covering | Suitable repair products |
| Mineral roofing felt | Felt patch, bitumen adhesive, flashing tape or repair coating |
| EPDM rubber | Compatible EPDM patch, primer and seam adhesive |
| GRP fibreglass | Resin and fibreglass repair kit |
| Corrugated bitumen | Compatible sheet patch, sealing tape or replacement section |
| Corrugated metal | Metal-compatible tape, coating or replacement fixing |
| Plastic sheet | Compatible plastic repair tape or replacement sheet |
| Bitumen shingles | Replacement shingles and suitable adhesive |
| Suspected asbestos cement | Do not use an ordinary DIY repair kit without specialist advice |
Do not select a product only because the packaging says “roof repair”. Check the manufacturer’s list of compatible surfaces.
Shed Felt Repair Kits
Traditional mineral felt remains common on UK garden sheds. Small splits can sometimes be repaired with a piece of compatible felt, cold-applied bitumen adhesive or self-adhesive patching material.
Typical felt repair products include:
- Self-adhesive felt patches
- Flashing tape
- Roofing felt adhesive
- Brush-on bitumen coating
- Reinforced liquid membrane
- Replacement felt rolls
- Clout nails and edge battens
B&Q, Wickes and Screwfix currently carry shed felt or roofing-felt ranges, while Toolstation sells repair paints, sealants and flashing tapes.
When a felt patch may work
A patch can be suitable where:
- The tear is small
- The surrounding felt remains flexible
- The roof deck is firm
- The surface can be cleaned and dried
- The damage is away from a badly failed edge
- Water has not rotted the timber underneath
When a patch is unlikely to work
Replacement usually makes more sense where:
- Felt is brittle across the roof
- Several tears are present
- Large bubbles have formed
- Edges have lifted extensively
- The roof boards are soft
- Previous patches keep failing
- Water stands on the roof
- The felt has shrunk away from the perimeter
Felt Repair Paint and Liquid Coatings
Brush-on roof coatings can cover small cracks and weathered areas. Some products contain fibres that reinforce the finished layer.
These coatings are often marketed for emergency repairs and may bond to felt, bitumen, metal and other roofing surfaces. Toolstation and B&Q both currently list roof-repair paints and sealants for cracks, splits and emergency weatherproofing.
A liquid coating may help where:
- The surface has fine cracking
- A short-term repair is needed
- The roof cannot be stripped immediately
- The existing material remains firmly attached
- A small joint needs sealing
However, repair paint cannot strengthen rotten timber or securely reattach large areas of loose felt.
Flashing Tape for Shed Roof Repairs
Flashing tape is a flexible waterproof strip with an adhesive backing. It can be pressed over small tears, seams and junctions.
It may be useful for:
- An emergency felt patch
- A split along a roof edge
- A small hole around a fixing
- A temporary repair around flashing
- Sealing a short joint between sheets
For the best bond, the surface normally needs to be clean, firm and compatible with the tape.
Common problems include:
- Applying it to wet mossy felt
- Using a very small patch
- Leaving sharp corners
- Failing to press down the edges
- Applying tape over loose material
- Expecting it to repair structural damage
Where possible, round off the corners of the patch. Sharp corners can lift more easily.
EPDM Shed Roof Repair Kits
EPDM is a flexible rubber membrane used on many newer sheds, garden rooms and flat-roofed outbuildings.
A typical EPDM repair kit may contain:
- Rubber patch
- Cleaning solution
- Primer
- Contact adhesive
- Seam tape
- Application brush
- Roller
- Sealant
Small kits are designed for cuts and punctures. Complete shed kits contain a larger single-piece membrane and adhesive for replacing the entire roof.
UK specialist suppliers currently offer EPDM patch kits from roughly the mid-teens, while complete small shed kits begin at several times that amount depending on dimensions and contents.
What an EPDM patch can repair
- Small punctures
- Straight cuts
- Localised tears
- Damage caused by a fallen branch
- A small failed seam
- Damage around one roof fitting
What it cannot repair
- Rotten decking
- A membrane that has separated across a large area
- Widespread shrinkage
- Poor roof falls
- Major edge failure
- Several badly formed seams
- Water trapped beneath the membrane
Use products made for the particular rubber roofing system. Ordinary silicone or bitumen can be incompatible with some membranes.
Complete EPDM Shed Roof Kits
A complete rubber roofing kit can be a useful alternative to repeatedly repairing old felt.
Many kits contain:
- Pre-cut EPDM membrane
- Deck adhesive
- Contact adhesive for edges
- Sealant
- Installation guide
PermaRoof sells standard-size and custom EPDM shed kits, while Rubber4Roofs and Rubber Roofing Direct also offer shed-specific rubber systems.
A complete EPDM kit may suit a competent DIY homeowner where:
- The shed roof is low and accessible
- The deck is smooth and structurally sound
- The roof has a simple shape
- The membrane can be laid in one piece
- Dry weather is available
- The manufacturer’s instructions can be followed closely
Corners, roof edges and wall junctions require careful preparation. These details often determine whether the finished roof remains watertight.
GRP Fibreglass Roof Repair Kits
GRP repair kits are intended for cracked or damaged fibreglass roofs.
A typical kit may contain:
- Polyester resin
- Catalyst
- Fibreglass matting
- Topcoat
- Brushes
- Rollers
- Mixing container
- Gloves
Roofing Kits Direct currently sells a kit intended for repairing or replacing up to 1m², while other specialist suppliers offer different sizes and tool options.
GRP kits may repair
- Hairline cracks
- Small impact damage
- Pinholes
- Localised delamination
- Damage around one trim
- A small area of failed laminate
Full replacement may be needed where
- Cracks run across much of the roof
- The timber deck moves
- The laminate has separated widely
- Several trims have failed
- Water has reached rotten decking
- The roof was installed with an unsuitable resin mix
GRP resin and catalyst require accurate mixing. Temperature and weather conditions can also affect curing.
Corrugated Shed Roof Repair Products
Corrugated sheds may use bitumen, metal, plastic or fibre-cement sheets.
Small repairs can include:
- Replacing damaged screws
- Renewing sealing washers
- Applying compatible repair tape
- Sealing around a fixing
- Replacing one damaged sheet
- Repairing a short lap
Roofing Superstore currently carries shed roofing materials including felt, shingles and bitumen roofing sheets, while Wickes sells a broader roofing-sheet range.
A large split or badly weathered sheet usually needs replacing rather than covering with sealant.
A Warning About Asbestos Shed Roofs
Older corrugated cement roofs may contain asbestos.
Do not:
- Drill them
- Saw them
- Sand them
- Pressure wash them
- Break them
- Scrape heavy moss from them
- Apply a repair that requires disturbing the sheet
A visual inspection cannot always confirm whether a sheet contains asbestos. Arrange specialist advice or testing where the material is uncertain.
A normal DIY shed roof repair kit is not an appropriate solution where the work could release asbestos fibres.
Where to Buy Shed Roof Repair Kits in the UK
Homeowners can choose between national DIY chains, trade retailers and specialist roofing suppliers.
B&Q
B&Q sells:
- Shed roofing felt
- Roof sealants
- Repair paints
- Adhesives
- Some complete rubber roof kits
- Roofing tools and fixings
Its website currently has separate ranges for roofing felt, roof sealants and general shed roofing supplies.
Wickes
Wickes carries:
- Mineral roofing felt
- Heavy-duty felt
- Felt adhesive and primer
- Roof repair liquids
- Roofing sheets
- Fixings and timber boards
The retailer currently lists IKO felt for garden buildings alongside adhesives, primers and roof-repair liquids.
Screwfix
Screwfix currently lists:
- Roofing felt
- Felt adhesive
- Repair coatings
- Sealants
- Flashing products
- EPDM garden-building kits in several dimensions
Availability varies by product and location, and some online-only garden-building kits can be temporarily out of stock.
Toolstation
Toolstation is useful for:
- Roof repair paint
- Liquid waterproofing
- Sealants
- Flashing tape
- Brushes and application tools
Its roof-repair category includes products from several established roofing and sealant brands.
Roofing Superstore
Roofing Superstore carries a wider specialist range, including:
- Shed felt kits
- EPDM patches
- Felt patches
- Bitumen sheets
- Shingles
- Roofing accessories
It can be particularly useful where a homeowner needs a specific product rather than a general-purpose sealant.
EPDM specialists
Specialist rubber roofing sellers include:
- PermaRoof
- Rubber4Roofs
- Rubber Roofing Direct
- Roofing Kits Direct
- Roof Giant
- Roofing Outlet
These suppliers often provide standard-size shed kits, custom-cut membrane and system-specific repair materials.
GRP specialists
Fibreglass repair materials are available from companies such as:
- Roofing Kits Direct
- Resin Library
- East Coast Fibreglass Supplies
- Flat-roofing specialists
A specialist supplier may offer more detailed instructions and a choice of repair area sizes.
Online marketplaces
Amazon and eBay carry a broad range of patches, tapes and complete kits.
However, check:
- The actual manufacturer
- Membrane compatibility
- Kit dimensions
- Seller feedback
- Product instructions
- Whether adhesives are included
- Delivery restrictions for resin or chemicals
- Whether the system has UK technical support
Do not choose only by the number of items in the box.
UK Shed Roof Repair Kit Price Guide
The following ranges are broad budgeting figures. Retail prices and availability change regularly.
| Product type | Typical retail price |
| Emergency sealant cartridge | £8–£20 |
| Flashing or repair tape | £10–£35 |
| Small felt patch | £15–£35 |
| Roof repair coating, small tin | £20–£40 |
| Felt adhesive | £20–£40 |
| Small EPDM patch kit | £15–£35 |
| GRP patch kit | £45–£120 |
| Basic shed felt roll | £30–£80 |
| Heavy-duty felt and fixing materials | £60–£180 |
| Small complete EPDM shed kit | £45–£100 |
| Medium complete EPDM kit | £80–£220 |
| Large felt replacement kit | £100–£200 |
| Larger GRP roofing kit | £100–£300 or more |
Current examples include small EPDM repair kits at around £15–£30, a basic 10m felt roll at just over £30, and complete rubber shed kits beginning at roughly £40–£70 for smaller dimensions.
What Should a Good Kit Include?
The exact contents depend on the material.
Felt repair kit checklist
- Compatible patch
- Felt adhesive or self-adhesive backing
- Primer where required
- Application brush
- Clear overlap instructions
EPDM repair kit checklist
- Compatible rubber patch
- Membrane cleaner
- Primer
- Seam adhesive or repair tape
- Application roller or brush
- Edge sealant where required
GRP repair kit checklist
- Resin
- Correct catalyst
- Fibreglass matting
- Topcoat
- Measuring or mixing guide
- Roller and brush
- Gloves
- Suitable working-temperature guidance
A cheap kit can become poor value if several essential components must be purchased separately.
How to Measure for a Complete Shed Roof Kit
Measure the roof itself rather than relying only on the shed’s advertised floor size.
For a pent roof:
- Measure the full width, including overhangs.
- Measure from the high edge to the low edge.
- Add enough membrane for edge finishing.
- Allow for trimming.
For an apex roof:
- Measure one full roof slope from ridge to edge.
- Measure the length, including overhangs.
- Repeat for the opposite slope.
- Allow for the ridge detail.
- Add the overlap required by the system.
Some suppliers describe the kit using the nominal shed size, while others state the exact membrane dimensions. Always check both.
Check the Roof Deck Before Ordering
A repair kit will not solve damaged supporting timber.
Inspect the underside of the roof for:
- Soft boards
- Sagging
- Delaminated plywood
- Swollen OSB
- Mould
- Damp rafters
- Loose fixings
- Insect damage
- Daylight through holes
- Water staining
Press suspicious timber lightly from inside where safe. Soft, crumbling or badly swollen boards need replacing.
Do not climb onto the shed roof to test it.
Can You Apply a Repair Kit in Wet Weather?
Some emergency coatings claim that they can be applied in damp conditions. However, many felt adhesives, EPDM primers and GRP resins need a clean and dry surface.
Applying a kit to wet material can cause:
- Weak adhesion
- Trapped moisture
- Bubbles
- Peeling edges
- Uncured resin
- Repeat leaking
Read the instructions before opening the product. Waiting for a dry day may produce a much stronger repair.
Basic Shed Roof Patch Process
The exact process varies, but a typical local repair involves:
- Identifying the roof material.
- Checking that no asbestos is present.
- Finding the full extent of the damage.
- Cleaning away loose material.
- Allowing the surface to dry.
- Cutting a patch larger than the damaged area.
- Rounding the corners where appropriate.
- Applying the specified primer or adhesive.
- Pressing or rolling the patch firmly.
- Sealing exposed edges if required.
- Checking the repair after rainfall.
Never use this general process instead of the kit manufacturer’s instructions.
How Large Should a Patch Be?
A patch should extend beyond the tear onto firm and well-bonded roofing material.
A patch that barely covers the hole may fail around the edges.
The correct overlap depends on the product. Factors include:
- Roof material
- Damage shape
- Patch system
- Position on the roof
- Water flow
- Condition of the surrounding covering
Where the damage reaches an edge or seam, the repair may require a different detail rather than a simple square patch.
Common Shed Roof Repair Kit Mistakes
Buying the wrong system
EPDM, felt and GRP need different repair materials.
Patching over rot
The waterproof patch may hold while the roof deck continues to collapse.
Applying products over moss
Adhesives will bond to the dirt rather than the roof.
Ignoring the leak source
Water may be entering higher up and travelling beneath the covering.
Making the patch too small
A narrow overlap is more likely to lift.
Using incompatible sealant
Some solvents and bitumen products can affect rubber membranes.
Failing to prepare GRP
Fibreglass usually needs cleaning and abrasion before new material can bond.
Repairing during unsuitable weather
Rain, frost and extreme temperatures can affect adhesives and resins.
Expecting an emergency product to last permanently
A rapid repair may only provide time to arrange proper replacement.
When a Shed Roof Repair Kit Is Worth Buying
A kit can offer good value where:
- The damage is localised
- The roof deck remains firm
- The surrounding covering has useful life left
- The material can be identified
- The correct compatible product is available
- Safe access is possible
- The repair can be completed in dry weather
- The shed stores low-risk items
- The homeowner is comfortable following instructions
When You Need a Full Replacement
Replace the covering rather than patching it where:
- Several leaks are present
- Felt is brittle throughout
- EPDM has shrunk away from several edges
- GRP has widespread cracking
- Corrugated sheets are badly weathered
- Roof boards are rotten
- The roof sags
- Water remains in deep puddles
- Several older patches have failed
- The existing system was installed incorrectly
A complete kit may still make replacement suitable for DIY, provided the roof is simple and structurally sound.
When to Hire a Roofer
Professional help is sensible where:
- The shed is large or tall
- Access is difficult
- The roof attaches to a wall
- Lead flashing is required
- Structural timber needs repair
- The building is a garden office
- Electrical equipment is stored inside
- The roof contains complex seams or valleys
- Asbestos is suspected
- Repeated DIY repairs have failed
- The correct leak point cannot be found
A roofer can remove the covering, replace rotten decking and install a suitable full system.
Repair Kit vs Professional Repair
| Factor | DIY kit | Professional repair |
| Initial cost | Lower | Higher |
| Best for | Small and clear defects | Larger or uncertain problems |
| Safety | Homeowner’s responsibility | Contractor plans access |
| Diagnosis | Depends on DIY knowledge | Roof and timber can be assessed |
| Material compatibility | Homeowner must check | Roofer selects the system |
| Timber repairs | Separate work may be needed | Often included |
| Finish | Depends on experience | Usually more consistent |
| Guarantee | Mainly product warranty | May include workmanship |
| Time | May take a full weekend | Often completed quickly |
| Asbestos | Specialist help still required | Suitable contractor can arrange assessment |
How Long Should a Repair Kit Last?
There is no single lifespan for every kit.
A repair may last for years where:
- The surrounding roof remains sound
- The material is compatible
- The surface was prepared correctly
- The patch has a generous overlap
- Water drains freely
- The roof does not move excessively
A repair may fail quickly where:
- It covers rotten decking
- Moisture was trapped underneath
- The wrong adhesive was used
- The roof covering is brittle
- Ponding water remains
- Wind can catch the patch edge
Treat claims of a universal permanent repair carefully.
Final Thoughts
Shed roof repair kits can provide an inexpensive solution for small tears, punctures and cracks. UK homeowners can buy felt products and emergency coatings from retailers such as B&Q, Wickes, Screwfix and Toolstation, while specialist roofing suppliers offer EPDM and GRP systems.
The most important step is matching the kit to the existing material. Felt, EPDM and fibreglass all require different products and preparation.
Before applying anything, check the timber underneath. A waterproof patch cannot repair rotten boards, sagging rafters or poor drainage.
For a small local fault, a correctly installed patch may extend the roof’s life. Where the covering has failed across a wide area, a complete replacement kit or professional re-roof will usually offer better value.
Frequently Asked Questions
What is the best shed roof repair kit?
The best kit is one made for the existing roof material. Felt needs a compatible bitumen or patching product, EPDM needs a rubber repair system and GRP needs resin with fibreglass reinforcement.
Where can I buy a shed roof repair kit in the UK?
Felt, sealants and repair paints are available from B&Q, Wickes, Screwfix and Toolstation. Specialist roofing retailers sell EPDM patches, complete rubber shed kits and GRP repair systems.
How much does a shed roof repair kit cost?
Small sealants and patch kits may cost around £10 to £35. GRP kits and complete replacement systems can cost from roughly £45 to several hundred pounds.
Can I use flashing tape on shed felt?
Flashing tape may repair a small tear or joint where the felt remains sound. The surface needs to be clean, firm and compatible with the adhesive.
Can I use ordinary silicone on an EPDM roof?
Ordinary silicone may not bond correctly or may be incompatible with the membrane. Use a repair product approved for the particular EPDM system.
Are brush-on roof repairs permanent?
Some coatings can provide a durable local repair, but many serve mainly as emergency protection. Their performance depends on preparation and the condition of the roof underneath.
Can a repair kit fix rotten shed roof boards?
No. Rotten decking must be removed and replaced before the roof covering receives a permanent repair.
Can I patch shed felt while it is wet?
Some emergency products work in damp conditions, but many adhesives need a clean, dry surface. Check the manufacturer’s instructions.
Is an EPDM kit better than replacing the shed felt?
A complete EPDM system may offer a longer-lasting covering than basic felt. However, it costs more and needs a smooth, sound deck with careful edge detailing.
Can I repair a cracked fibreglass shed roof?
Small cracks and punctures may accept a GRP repair kit. Widespread cracking or movement in the timber deck may require a larger replacement.
How do I know which repair kit is compatible?
Check the existing roofing material and read the product’s approved-surface list. Contact the manufacturer or supplier when the membrane cannot be identified.
Can I put a repair patch over moss?
No. Moss, dirt and loose material prevent the patch from bonding properly. The area needs suitable cleaning and preparation first.
Should I remove old felt before using a complete kit?
Removing failed felt allows you to inspect the boards and create a better surface. Old material may sometimes remain if it is completely dry, flat and securely fixed, subject to the new system’s instructions.
Can I repair a corrugated asbestos shed roof?
Do not disturb a suspected asbestos roof with ordinary DIY repair methods. Arrange specialist advice before drilling, cutting, cleaning or patching the sheets.
When should I call a roofer instead?
Hire a roofer where the roof is sagging, timber is rotten, several leaks are present, access is unsafe or earlier patches have failed.
