Water ingress through a commercial roof can quickly become more than a localised maintenance problem.
Persistent leaks can affect insulation, internal finishes, equipment and occupied areas, while unresolved defects can allow deterioration to spread across the wider roof system.
Building Transformation provides commercial roof waterproofing services for a wide range of roof types, including complex and difficult-to-access commercial buildings.
Our approach starts by understanding where and why the roofing system is failing. We can then determine whether the problem requires a targeted repair, a waterproofing intervention or wider refurbishment work to restore performance and protect the roof over the longer term.
We have delivered roofing and waterproofing work across busy hotels, heritage buildings and large commercial estates, planning works around occupants and ongoing operations wherever possible.
Effective waterproofing depends on identifying the defect before selecting the system used to repair it.
Leaks can originate from failed membranes, deteriorated seals, drainage problems, damaged roof coverings or weaknesses around junctions, rooflights and other penetrations. Treating the visible symptom without understanding the underlying cause can leave the building exposed to recurring water ingress.
Where required, we investigate roof condition using appropriate inspection techniques, including thermal imaging or moisture mapping where these are needed to assess insulation saturation and underlying deck condition.
Once the problem has been identified, we can recommend a suitable repair or waterproofing solution based on the existing roof, its condition and the requirements of the building.
Our teams can use rope access, MEWPs, cradles, anchor systems and walk-on inspection methods to reach roof areas that may be difficult to inspect and maintain using conventional access.
The access method supports the work rather than defining it. The objective is to restore waterproofing performance safely, minimise disruption and help extend the service life of the roof.
We work across:
Whether you are responding to an active leak or planning preventative roof maintenance, our commercial roofing and waterproofing services are designed to help protect the wider building fabric and reduce the risk of further deterioration.
No two commercial roofing systems deteriorate in exactly the same way.
Roof construction, materials, drainage, exposure and previous maintenance can all influence the cause of water ingress and the type of intervention required.
For this reason, our roof waterproofing services are based on the condition of the individual roof rather than applying the same repair method to every building.
Our teams can access and repair complex roof areas using rope access, MEWPs and other appropriate access techniques, helping reduce disruption where extensive conventional access is unnecessary.
We work on commercial properties ranging from high-rise offices and hotels to heritage buildings and retail environments.
Flat roofs can be vulnerable to ponding water, membrane splits and drainage problems.
Common systems include felt, bitumen and single-ply membranes such as PVC or TPO. Over time, exposure to weather, UV and ineffective drainage can cause these materials and their detailing to deteriorate.
Depending on the roof construction and condition, we can assist with:
Where necessary, we can also investigate beneath the visible roof surface using thermal imaging or moisture mapping to assess whether insulation has become saturated or the underlying deck has been affected.
Understanding the extent of deterioration helps determine whether a local waterproofing repair is sufficient or whether wider roof refurbishment should be considered.
Pitched roofs can develop water ingress as a result of slipped tiles, failed ridges, damaged underlays or defects around chimneys, valleys and flashings.
Repairs to these roofs require careful investigation because water may enter at one location before becoming visible elsewhere within the building.
Where buildings remain occupied or roof areas face busy public spaces, we plan access and repair works carefully to minimise unnecessary noise, dust and disruption.
This can be particularly important for hotels, schools, commercial offices and sensitive heritage properties.
Metal roofing systems are designed for longevity but can still deteriorate as a result of corrosion, loose fixings, joint failure and movement.
Seasonal expansion and contraction can also affect seals and fixings over time, creating potential routes for water ingress.
Our repair and waterproofing work can include:
Where deterioration is more extensive, the findings can also inform a wider maintenance or refurbishment strategy rather than relying on repeated reactive repairs.
Where a roof condition survey identifies widespread deterioration or a roofing system that has failed beyond viable repair, complete commercial roof replacement may be the appropriate course of action.
Depending on the condition of the building, replacement works may include:
For industrial roof replacement and commercial building roof replacement projects, access and sequencing are planned around the building and its occupants so that work can be completed safely with minimal impact on day-to-day operations.
If you are unsure whether to repair, refurbish or replace your roof, our guide to repairing or replacing a leaking flat roof provides further information.
Liquid waterproofing can be particularly suited to domes, skylights and roof lanterns because it:
Building Transformation is an LRWA-accredited company, providing additional assurance around the application of liquid roofing and waterproofing systems.
Our application teams are trained and certified in multiple leading membrane systems and work with manufacturers to support appropriate preparation, installation and curing.
Issues we can investigate and repair include:
These defects can be particularly difficult to diagnose because the visible point of water ingress inside the building may not correspond directly with the external failure.
Our work therefore starts with an assessment of the condition and likely cause of the problem before a waterproofing specification is developed.
Following the survey, we provide clear recommendations and a planned approach to the remedial work. This can include photographic evidence, specification information and aftercare guidance where appropriate to support future maintenance.
Effective drainage is fundamental to the performance of a commercial roofing system.
When rainwater cannot leave the roof correctly, standing water and overflowing drainage systems can contribute to membrane deterioration, water ingress and damage elsewhere within the building fabric.
Our dedicated gutter and rainwater maintenance service covers the wider maintenance of these systems. Gutter lining provides a further waterproofing option where gutters are integrated directly into the roof structure.
Large commercial, industrial and public buildings often use internal gutters, parapet gutters and other integrated drainage systems, particularly on flat and low-pitched roofs.
Over time, these systems can deteriorate through:
Complete gutter replacement can sometimes be disruptive, costly and difficult to deliver, particularly where the gutter forms an integral part of the existing roof construction.
Where the existing gutter remains suitable for refurbishment, a lining system can create a new watertight barrier inside it without requiring complete removal.
Systems can be used on suitable metal, concrete and timber gutters and may be cold-applied to minimise disruption.
The benefits can include:
For internal and box gutters, flexible liquid-applied membranes or pre-formed single-ply systems can provide a durable waterproof finish around awkward junctions, changing widths and tight corners.
The correct approach depends on the condition of the gutter, its substrate and the wider drainage system.
Balconies and external walkways are continually exposed to weather, foot traffic and changes in temperature.
Where waterproofing systems begin to fail, moisture can penetrate concrete or other substrates and contribute to corrosion, cracking and surface deterioration.
For hotels, commercial complexes and other managed properties, maintaining these areas can therefore be important for safety, building condition and long-term asset protection.
Building Transformation provides repair and waterproofing services for balconies and walkways, including areas that can be difficult to reach using traditional access methods.
Our IRATA-trained technicians can carry out:
Failed surface waterproofing is a common cause of balcony deterioration.
Once water penetrates a concrete slab, it can reach embedded steel and contribute to corrosion and subsequent surface spalling. Addressing the waterproofing defect can therefore help protect more than the visible surface.
We use flexible liquid membrane systems designed to provide a seamless, slip-resistant waterproof finish.
Depending on the application, these systems can:
Before carrying out the work, we assess the existing condition and provide a clear schedule of recommended repairs.
Where buildings remain occupied, our teams can plan work around operational requirements to minimise the impact on guests, tenants and building users.
Roof waterproofing may be appropriate where inspection identifies a localised or wider failure in the existing weatherproofing system but the underlying roof remains suitable for repair or refurbishment.
Signs that investigation may be required include:
The presence of a leak does not automatically mean that the entire roof needs replacing.
Targeted professional roof waterproofing services may be able to restore performance and extend the service life of the existing roof. Where deterioration is more extensive, however, a broader refurbishment or replacement programme may be more appropriate.
The purpose of the initial assessment is to establish that distinction before unnecessary work is commissioned.
Waterproofing should not be considered in isolation from the wider condition of the roof.
A successful intervention may resolve the immediate defect, but ongoing roof performance also depends on drainage, membranes, seals, insulation and routine maintenance remaining in suitable condition.
Our aim is therefore to help building and facilities teams move from the immediate problem towards a more informed maintenance approach.
That can mean:
Identify the defect → understand the cause → waterproof or repair the affected area → monitor and maintain the roof → protect the wider building fabric.
Where a survey identifies additional deterioration, we can also advise on related roof repair, refurbishment or maintenance requirements.
If your commercial roof is leaking or showing signs of waterproofing failure, a condition survey can help identify the cause and establish whether localised repair, waterproofing or wider refurbishment is required.
What are the signs that a commercial roof needs waterproofing?
Common signs include recurring leaks, ponding water, deteriorating membranes, failed seals, corrosion and water ingress around rooflights, upstands or other junctions. An inspection can help establish the source of the problem and whether targeted waterproofing, repair or wider refurbishment is required.
Can roof waterproofing stop recurring leaks?
Yes, where the cause of the leak has been correctly identified (we provide lead detection surveys) and the existing roof is suitable for repair. Effective roof waterproofing depends on addressing the underlying defect rather than simply treating where water becomes visible inside the building.
What types of commercial roofs can be waterproofed?
Our roof waterproofing services can be used across suitable flat roofs, metal and standing-seam roofs, pitched roof details, gutters, domes, skylights and roof lanterns. The appropriate system depends on the existing materials, condition of the roof and nature of the defect.
What is liquid roof waterproofing?
Liquid roof waterproofing uses a liquid-applied membrane to create a seamless protective barrier over suitable roof surfaces. It can be particularly effective around complex shapes, junctions, upstands, skylights and other areas that can be difficult to waterproof using sheet materials.
Is waterproofing better than replacing a commercial roof?
It depends on the condition of the existing roof. Where the underlying roof remains serviceable, waterproofing or refurbishment may extend its lifespan and avoid unnecessary replacement. Where deterioration is more extensive, a wider refurbishment or complete roof replacement may be more appropriate. A roof condition survey can help establish the right approach.
Can you waterproof difficult-to-access roof areas?
Yes. Where required, Building Transformation can use specialist access methods including rope access, MEWPs and cradles to inspect and waterproof difficult-to-reach roof areas while minimising unnecessary disruption.