Flat roofing is used across homes and commercial properties throughout the UK, including extensions, garages, dormers, porches, balconies, outbuildings and larger commercial roofs. Different properties require different roofing systems, so choosing the correct materials and roof construction is an important part of achieving a durable, weather-resistant finish.
Flat Roofing Specialists Near You
Finding an experienced flat roofing specialist is particularly important because problems with the roof covering, drainage, detailing or underlying structure can eventually lead to leaks, damp and damage inside the property.
Professional flat roofers can inspect your existing roof, identify defects and recommend whether a repair, refurbishment or complete replacement is the most appropriate solution.
Depending on the property and roof specification, flat roofing systems can include GRP fibreglass, EPDM rubber roofing, high-performance felt and liquid-applied roofing systems.
Through iProTrades, homeowners can find local roofing specialists and request quotes for flat roofing work.
Flat Roof Repairs
Not every leaking or damaged flat roof needs to be completely replaced. In many cases, a professional repair can extend the life of the existing roof and prevent further water ingress.
Common flat roof problems include:
Leaks and water ingress
Cracked, split or damaged roof coverings
Failed joints and seams
Damaged flashing and roof trims
Ponding or standing water
Blocked or inadequate drainage
Blistering or bubbling
Deteriorated felt
Damaged GRP or liquid coatings
Problems around rooflights, outlets and penetrations
The source of a flat roof leak is not always directly above where water appears inside the property. Water can travel beneath the roof covering or through the roof structure before becoming visible internally.
An experienced flat roofer should therefore inspect the complete roof rather than simply applying sealant to the area where the leak appears.
New Flat Roof Installation
Correct installation is one of the most important factors affecting the performance and lifespan of a flat roof.
Before installing a new roof covering, the roof structure and deck should be checked to ensure they are suitable for the chosen roofing system. The roof must also have adequate falls so rainwater can drain towards the appropriate outlets or guttering.
A new flat roof may involve:
Inspecting or replacing the existing roof deck
Creating suitable falls for drainage
Installing a vapour control layer where required
Installing insulation
Fitting the chosen waterproof roofing system
Forming perimeter edges and trims
Weatherproofing rooflights and penetrations
Installing outlets and drainage
Completing flashing and abutment details
Attention to these details is just as important as the main waterproof covering.
Flat Roof Replacement
Older flat roofs can eventually reach a point where repeated repairs are no longer economical.
Signs that a flat roof may need replacing can include widespread cracking, persistent leaks, extensive blistering, deteriorated materials, damaged decking or recurring areas of standing water.
When replacing a flat roof, removing the existing covering also provides an opportunity to inspect the roof deck and supporting structure for hidden moisture damage or deterioration.
Depending on the work being carried out, it may also be possible to improve the roof's insulation and thermal performance as part of the replacement.
A roofing specialist should explain the available options and provide a clear quotation detailing the proposed roofing system, preparation and associated work.
GRP Fibreglass Flat Roofing
GRP (Glass Reinforced Plastic), commonly known as fibreglass roofing, is widely used for domestic flat roofs.
A GRP roofing system typically consists of resin reinforced with fibreglass matting, followed by a protective topcoat. When correctly installed, it creates a strong and seamless waterproof surface.
GRP is commonly used for:
One advantage of GRP is that the finished roof has very few joints, reducing the number of potential weak points within the waterproof covering.
Correct preparation of the roof deck, installation conditions and detailing around edges, outlets and penetrations are particularly important when installing GRP roofing.
EPDM Rubber Roofing
EPDM is a synthetic rubber roofing membrane commonly used for flat and low-pitched roofs.
Large sections of EPDM membrane can often be installed with relatively few seams, creating a flexible waterproof covering. The material is resistant to weathering and can accommodate normal movement within the roof structure.
EPDM systems can be suitable for extensions, garages, garden buildings, dormers and other flat-roof applications.
As with any roofing system, the quality of the installation and detailing around edges, rooflights, outlets and adjoining walls has a major influence on long-term performance.
Felt Flat Roofing
Modern high-performance felt roofing is significantly different from many older traditional felt roofs.
Contemporary systems can use multiple layers of reinforced bituminous membranes to create a durable waterproof covering. Depending on the system, the membranes may be torch-applied, self-adhesive or installed using other approved methods.
Felt roofing remains widely used on both domestic and commercial properties and can be suitable for roofs of many different shapes and sizes.
Correct installation of laps, upstands, outlets, edges and flashing details is essential to achieving a reliable finished roof.
Liquid Roofing Systems
Liquid-applied roofing systems provide another option for waterproofing flat and low-pitched roofs.
The system is applied as a liquid before curing to form a continuous waterproof membrane. Because the finished covering can be largely seamless, liquid roofing can be particularly useful on roofs containing complicated details, penetrations or awkward shapes.
Different manufacturers produce different liquid roofing systems, so preparation, reinforcement, application conditions and required coating thickness can vary.
A roofing contractor should install the system in accordance with the manufacturer's specification.
Warm Flat Roof Systems
A warm roof is a roof construction where the insulation is positioned above the structural roof deck.
This keeps the roof deck and much of the supporting structure on the warm side of the insulation and can provide good thermal performance when correctly designed.
A typical warm flat roof may include the structural deck, a vapour control layer, rigid insulation and the waterproof roof covering above.
Warm roof construction is commonly considered for new extensions, new-build roofs and complete flat roof replacements where improved insulation is required.
The exact construction and insulation thickness will depend on the property, roofing system and applicable Building Regulations.
Flat Roof Drainage and Falls
Although they are described as flat roofs, properly designed flat roofs should normally have a slight fall to encourage rainwater to drain towards outlets or guttering.
Poor drainage can allow water to remain on the roof for extended periods, commonly referred to as ponding water.
Drainage problems can result from inadequate falls, blocked outlets, poorly positioned drainage or movement within the roof structure.
When installing or replacing a flat roof, the contractor should consider how water will leave the roof rather than focusing only on the waterproof covering.
Flat Roof Insulation
Insulation can have a significant effect on the energy efficiency and comfort of the room beneath a flat roof.
When a flat roof is being replaced or constructed as part of a new extension, the insulation requirements should be considered as part of the overall roof design.
The appropriate insulation specification will depend on the roof construction and the work being undertaken.
For certain projects, Building Regulations may require the roof to achieve a specified level of thermal performance. Your roofing contractor or building professional should be able to explain the requirements that apply to your project.
Common Flat Roof Problems
Flat roofs can develop problems for many different reasons, including age, weather exposure, poor installation, movement within the building or inadequate drainage.
Warning signs worth investigating include:
Water stains on ceilings or walls
Damp patches
Visible cracks or splits
Blisters in the roof covering
Standing water after rainfall
Loose or damaged trims
Failed flashing
Deterioration around rooflights
Blocked outlets
Sagging areas of the roof
Investigating problems early can help prevent relatively minor defects from developing into more extensive damage to insulation, decking, ceilings or the structure below.
Repair or Replace a Flat Roof?
Whether a flat roof should be repaired or replaced depends on its age, condition, construction and the extent of the damage.
A relatively new roof with one isolated defect may only require a localised repair. An older roof experiencing widespread deterioration or repeated leaks may be more economical to replace.
Before recommending a complete replacement, a roofing specialist should inspect the existing roof and explain why replacement is considered necessary.
Homeowners should be cautious of automatically accepting a complete replacement without understanding the condition of the existing roof and the alternatives available.
Choosing a Flat Roofing Specialist
When comparing flat roofing contractors, price should not be the only consideration.
Ask what roofing system is being proposed, how the existing roof will be prepared and exactly what is included within the quotation.
A detailed quotation should make clear important aspects such as:
The roofing system and materials being installed
Removal of the existing covering where required
Roof deck repairs or replacement
Insulation requirements
Drainage and falls
Flashing and edge details
Waste removal
Access or scaffolding requirements
Guarantees offered for the work
It is also sensible to look for appropriate insurance, relevant experience and examples of similar flat roofing projects.
Find Local Flat Roofers with iProTrades
Whether you have a leaking garage roof, need a new roof for an extension or are considering replacing an ageing flat roof, finding the right specialist can make a significant difference to the finished job.
iProTrades helps homeowners connect with local flat roofing specialists for repairs, replacements and new installations.
Tell us about your project and provide as much information as possible about the property and existing roof. Where possible, include photographs of the roof or visible damage.
You can then receive quotes from local tradespeople and compare your options before deciding who you would like to carry out the work.