Membrane Splits & Tears
Ageing, movement and physical damage can create openings in the roof's waterproofing membrane.
Commercial & Industrial Roofing
Commercial Flat Roof Repair & Refurbishment
Specialist flat roof repairs, liquid-applied waterproofing and protective refurbishment solutions for commercial, industrial and public sector buildings across the UK.
Refurbish Rather Than Replace
Repairing Your Existing Flat Roof
A leaking or ageing flat roof does not always need complete replacement. Where the existing roof remains suitable, specialist repairs or a liquid-applied waterproofing system may offer a practical refurbishment solution.
Elite Waterproofing works with commercial and industrial property owners throughout the UK to address deteriorating flat roofs, failed waterproofing membranes and persistent water ingress.
Traditional felt, asphalt and single-ply roofing systems can deteriorate over time, developing defects such as splitting, failed joints, blistering and damaged perimeter details.
Our approach considers the condition of the whole roof, including its waterproofing membrane, insulation, drainage, upstands, outlets, rooflights and penetrations.
Where refurbishment is technically appropriate, a compatible waterproofing system may help extend the serviceable life of the existing roof without requiring wholesale removal.
Understanding Roof Defects
Common Causes of Flat Roof Leaks
Flat roof water ingress can arise from several different defects. Understanding the source of moisture is important before selecting a repair system.
Failed Seams & Laps
Deteriorated joints between membrane sections can become vulnerable to rainwater penetration.
Blistering & Delamination
Moisture, adhesion problems and ageing materials can cause blistering or separation within roofing layers.
Roof Outlets & Gutters
Blocked outlets, failed seals or deteriorated drainage details can contribute to water ingress.
Upstands & Flashings
Junctions around parapet walls, abutments and changes in level require suitable waterproofing details.
Roof Plant & Penetrations
Ventilation equipment, service penetrations, rooflights and other installations introduce potential leakage points.
Existing Roof Systems
Flat Roofing Materials We Can Assess
Different roof coverings require different repair methods. The selected waterproofing product must be compatible with the existing substrate and its condition.
Felt & Bituminous Roofing
Existing bituminous membranes may develop splits, blisters, open laps and deteriorated detailing. Suitable repairs or liquid-applied overlays may be considered after checking substrate condition.
Asphalt Roofing
Traditional asphalt roofs can develop cracks, movement-related defects and deteriorated junctions. Suitable repair materials must be specified for the existing system.
Single-Ply Membranes
PVC, TPO, EPDM and other membranes can develop damaged seams or localised defects. Repair methods depend on membrane type, age and compatibility.
Existing Liquid Waterproofing
Previously coated roofs may be suitable for localised repair or additional protective treatment after assessing adhesion, compatibility and substrate condition.
Specialist Refurbishment Systems
Liquid-Applied Flat Roof Waterproofing
Liquid-applied membranes can provide an effective refurbishment solution for suitable existing flat roofs, particularly where complex details make conventional sheet materials more difficult to install.
The liquid material is applied across appropriately prepared surfaces to form a continuous waterproofing layer.
Depending on the selected system, reinforcement may be incorporated to treat particular details or form part of the full waterproofing specification.
Liquid systems can also be selected for applications where avoiding hot works is advantageous. However, each system has its own application, chemical and safety requirements.
Roof suitability, surface adhesion, existing moisture conditions and compatibility must be checked before the treatment is specified.
Important: A new coating
must not be used to conceal
saturated insulation, significant
structural deterioration or
unsuitable existing roof layers.
The condition of the complete
roof build-up must be considered.
Refurbishment Options
Our Flat Roof Repair Solutions
Repair methods depend on the nature of the defect, roof construction and selected waterproofing system.
Targeted Leak Repairs
Localised treatment of identified defects, including compatible membrane repairs, joints, seams and vulnerable details.
Full Surface Refurbishment
Compatible protective waterproofing systems applied over suitable prepared roofing surfaces to renew weather resistance.
Detailed Waterproofing
Treatment of upstands, flashings, outlets, rooflights and penetrations with appropriate materials and reinforcement.
Partial Roof Repairs
Selected sections of deteriorated coverings may be repaired or replaced where the surrounding roof remains suitable for continued use.
Before Refurbishment
Assessing the Existing Flat Roof
Selecting the correct treatment begins with understanding the condition of the existing roof system.
Visible leaks do not always reveal the full extent of damage. Water can migrate beneath roof coverings before appearing inside a building.
Roof assessment may involve visual inspection, review of previous repairs, examination of drainage details and further investigation where required.
The aim is to establish whether the existing roof can reasonably be repaired or refurbished, or whether a more comprehensive replacement is appropriate.
Our Approach
From Roof Assessment to Refurbishment
We develop a practical refurbishment approach around the roof's existing condition and the selected system requirements.
Initial Enquiry
Discuss the property, roof construction, existing leakage problems and project requirements.
Roof Assessment
Review visible defects, drainage, existing waterproofing and suitability for repair.
Preparation & Detailing
Prepare suitable surfaces and address vulnerable joints, penetrations and weatherproofing details.
Waterproofing Application
Install the specified repair or refurbishment system with appropriate quality checks.
Refurbishment Advantages
Why Refurbish Your Existing Flat Roof?
Potential Cost Savings
Refurbishment may cost less than complete replacement where existing materials remain suitable.
Reduced Disruption
Suitable refurbishment methods may allow work to be organised around an occupied commercial building.
Seamless Waterproofing
Liquid-applied systems can provide continuous treatment around complex roof details.
Reduced Strip-Out
A compatible overlay may avoid unnecessary removal of serviceable existing roof materials.
Longer Serviceability
Correctly specified refurbishment can help extend the serviceable life of suitable roofs.
System Guarantees
Manufacturer-supported guarantees may be available for qualifying systems, subject to their terms.
Experience in Practice
Large-Scale Commercial Flat Roof Refurbishment
Elite Waterproofing's existing project portfolio includes extensive flat roof waterproofing and refurbishment work.
One example is the Mi Technology project in Preston, involving more than 10,000 m² of roofing across a manufacturing site.
The project required coordination around ongoing operations while providing waterproofing treatment across multiple roof areas.
Other documented work includes Camden residential flat roof refurbishment and felt roof waterproofing for commercial clients.
Choosing the Correct Solution
Refurbish or Replace Your Flat Roof?
Flat roof refurbishment is not suitable for every building. The existing condition should determine the treatment, rather than assuming one system fits all.
Flat Roof Repair & Refurbishment
Appropriate where the existing roof covering, insulation and support remain suitable for continued use and compatible waterproofing.
Works may involve localised membrane repairs or a complete protective refurbishment system.
Discuss RefurbishmentFlat Roof Replacement
More comprehensive replacement may be appropriate where deterioration is extensive, insulation is saturated or the roof deck is unsuitable.
Replacement can also allow substantial changes to insulation, drainage or the roofing specification.
Explore Replacement
Commercial Building Requirements
Refurbishment Around Your Operations
Flat roof works are frequently undertaken on occupied offices, factories, retail premises, public buildings and industrial properties.
Safe Access
Roofing works require appropriate access, edge protection and working-at-height arrangements.
Protection of Occupants
Work sequencing should consider people, equipment and activities beneath and around the roof.
Weather Conditions
Substrate temperature, moisture, rainfall and curing requirements may affect waterproofing application programmes.
Phased Refurbishment
Where technically suitable, projects may be carried out in sections to manage building use and operational disruption.
Any guarantee, application
programme or claim of minimal
operational disruption
must be confirmed for
the particular project,
rather than assumed
for every building.
Frequently Asked Questions
Flat Roof Repair FAQs
Can a leaking flat roof be repaired without replacement?
Yes, where the existing roof remains suitable. Localised repairs or compatible liquid-applied refurbishment systems may provide an alternative to complete replacement.
Can liquid waterproofing be applied over felt?
Some systems are compatible with suitably prepared bituminous membranes. Surface condition, trapped moisture, preparation and product compatibility must be checked first.
Can flat roof refurbishment stop persistent leaks?
Properly specified repairs can address identified sources of water ingress. The treatment must deal with the underlying defects, and its effectiveness depends on the condition of the existing roof.
Is ponding water a reason to replace a flat roof?
Not automatically. Persistent ponding should be assessed in relation to drainage, existing falls, membrane suitability and the roof structure. Some situations may require improvements beyond a coating.
How long does flat roof refurbishment last?
Service life depends on the existing substrate, surface preparation, selected system and maintenance. Manufacturer guarantees may be available for qualifying projects, subject to written conditions.
Will my business need to close during repairs?
Not necessarily. Some refurbishment programmes can be arranged around ongoing operations. Requirements vary according to site access, safety controls and the proposed works.
How much do commercial flat roof repairs cost?
Costs depend on the roof area, substrate condition, extent of defects, access requirements and chosen waterproofing specification. A project-specific quotation is required.
Explore Other Services
Related Roofing Solutions
Request a Quotation
Is Your Commercial Flat Roof Leaking?
Whether your property has recurring roof leaks, deteriorated felt, failed single-ply joints or requires broader waterproofing refurbishment, contact Elite Waterproofing to discuss practical repair options.
Call 01509 414300