
Flat Roof Leak Detection UK Specialist
Professional Roof Membrane Testing Company
If you suspect you may have a water leak through your flat roof’s membrane, it’s important to find and repair as soon as possible. With the short term stress of water seeping through causing wet patches, to the long term consequence of damp and mould, a water leak within your roof’s membrane can cause hidden damages to your property if not dealt with appropriately.
With state-of-the-art roof leak detection equipment alongside 30 years of experience, Cornerstone offer an independent, non-bias service for electronic integrity testing and all other roof membrane waterproof testing methods to ensure the structural and waterproofing integrity of your flat roof.

Why Choose Cornerstone?
Speed & Urgency
Our aim is to get your roof membrane in a pre-leak condition as soon as possible. We give our customers accurate timescales on how long the detection process will take.
Health & Safety
Making sure that the property occupants are safe from water leaks and mould growth is of paramount importance to us. We will make assessments on the condition of your property and will carry out appropriate actions.
Communication
Keeping open lines of communication is key to our flat roof leak detection process. We have dedicated claims managers that will update our customers at every step of the detection process. From initial assessments to completion, you will always be in the loop.
Specialist Equipment
We utilise specialist equipment and other state-of-the-art detection processes so that your claim is fully restored.
Flat Roof Leak Detection Services
Surveying and testing your roof’s membrane ensures its structural and waterproofing integrity, giving you confidence that it remains in a safe and operational condition. Utilising non-invasive methods that are completely unbiased, you can be sure that we provide accurate tests and surveys for your flat roof.
When it comes to finding leaks within your roof membrane, our capable team and network of specialist leak detectors play a crucial role in achieving the best possible outcome. Working alongside insurance companies, housing associations and private landlords, Cornerstone can effectively find the source of water leaks for flat roofs as well as providing comprehensive solutions to repair the issue in a cost-efficient manner.
Bringing Cornerstone on board to undertake roof membrane water leak tests, will result in a thorough and detailed solution. Utilising over 30 years of experience alongside specialist equipment and techniques, Cornerstone are the go-to specialist flat roof testing service in the UK.

Our Roof Membrane Testing Services
Cornerstone is at the forefront of change in the property damage management field, utilising advanced restorative techniques and maintaining a consistently high standard in roof membrane tests and surveys, exemplifying the embodiment of Best Practice.
Our deployment of cutting-edge equipment and extensive technical expertise allows us to establish a reliable methodology for detecting leaks in flat roofs. Our versatile approach positions us as a trusted service provider, offering effective solutions to a wide range of industry sectors, including insurance companies, loss adjusters, private landlords, homeowners, warranty providers, surveyors, housing associations, and local authorities.
- Comprehensive roof membrane testing package
- Emergency response team
- Established experts with over 30 years experience
- National coverage
- Electronic integrity testing

Did You Know?
A 0.5mm sized water leak in a flat roof could lose 20 litres of fluid every hour, causing considerable damage to your property.
Trusted Flat Roof Testing & Surveys
Using our SMART knowledge, a team of industry leaders, and the latest technology, we’re ready to test the integrity of your roof membranes. Whether you’re in the insurance industry or a private landlord, Cornerstone is here to conduct flat roof testing and surveys across the UK.

Flat Roof FAQs
The following FAQs are just the tip of the iceberg when it comes to understanding the testing and surveying procedures for flat roof membranes, however, they will give you a basic outline on how to approach its waterproof capabilities and structural integrity.
What is “roof membrane testing” & what does it involve?
Roof membrane testing is a process to evaluate the waterproofing and structural integrity of flat roof membranes. It involves using specialist, non‑invasive techniques, such as electronic integrity testing, to detect leaks, faults, or weaknesses in the roof membrane before they cause serious damage.
Why is regular roof membrane testing important?
Even small defects in a roof membrane can allow water ingress, which over time may lead to damp, mould, structural damage, or higher repair costs. Early detection through testing prevents hidden damage, protects the building’s fabric, and maintains waterproofing integrity.
What methods or technologies detect leaks or faults in the roof?
Cornerstone uses various specialist methods, including electronic integrity testing, plus other roof membrane waterproof testing methods. These are non‑destructive approaches, ensuring that leaks are accurately located without making unnecessary damage.
Who typically uses roof membrane testing services?
Roof membrane testing is used by a range of customers, including insurers, housing associations, private landlords, and homeowners.
Anyone with a flat roof who is concerned about leaks, or who wants to proactively ensure their roof remains waterproof will benefit.
What happens if defects are found during testing?
If any defects are identified, Cornerstone will provide a detailed report and recommend remedial/repair options to restore the flat roof and prevent further water ingress.
We can also assist in carrying out the repairs in a cost‑efficient manner.
Do you have a question about our flat roof testing services?
Speak to a member of our team today!
Contact Our Flat Roof Leak Detection Specialists
If you need further information on roof membrane testing, get in touch with our experts today.
Contact Our Flat Roof Leak Detection Specialists
If you need further information on roof membrane testing, get in touch with our experts today.
Head Office
Cornerstone Management Services Ltd
24 Picton House, Hussar Court
Westside View
Waterlooville
Hants
PO7 7SQ
Midlands Office
Call Us
02392 009 270Email Us
enquiries@cornerstone-ltd.co.ukOur Cornerstone Case Studies.
Cornerstone have experience in dealing with a variety of issues across the UK, and are trusted by leading housing associations, loss adjusters and more.

£37,000 Cost Saving for Insurance Company
Scenario: Decorations and furnishings were reported water damaged as a result of ‘secondary flooding’ from the recent flooding. Neighbours advised that water damage to the property was a result of floodwater ingress during the event, even though the property did not sugar any specific ingress. Moisture damage was evident on the ground and first floors.

Multi-Disciplined Approach to Damp Problem
Scenario: A 1970’s detached property has suffered from a damp problem to a localised area of the structure over a number of years. Prior to the appointment of Cornerstone, extensive investigations and been undertaken by a variety of professionals without resolution. Reason for contact: To identify the source of the moisture affecting the structure.
Some Of Our Clients.
We work across a range of industries from Insurance Companies to Housing Associations, and Private Landlords to Local Councils.




















