Case Study:Leak Investigation and Balcony Leadwork at a Residential Building in Basingstoke

A multi-storey residential development in Basingstoke required a careful investigation following reports of water ingress in one of the flats. The property management team also had a separate item of outstanding maintenance to address: additional leadwork to another balcony.

Spectrum Specialist Support attended the building to assess both areas during a single visit. By combining internal moisture testing with an external inspection of the accessible roof, gutter line and rendered wall, our team gathered clear evidence without recommending unnecessary remedial work. We also completed the requested balcony leadwork while already mobilised on site.

The Project

The client asked Spectrum to investigate signs of water ingress affecting one of the flats. Moisture readings taken around the internal area were approximately 48-50, indicating that moisture was present and that further investigation was required.

The possible source of the problem was not immediately clear. Water can travel behind finishes and enter a building some distance from where dampness becomes visible internally. For this reason, the investigation needed to consider several external areas, including:

• The roof

• The gutter line

• The surrounding rendered wall

• Any concealed sections close to the affected area

During the same attendance, the team was also asked to inspect existing balcony leadwork elsewhere in the building and extend the lead along the side upstands. An upstand is the raised edge where a waterproof covering turns upwards against a wall or adjoining surface, helping to stop water from entering at the junction.

The Access

The team used the scaffolding already installed around the building, together with internal access through the relevant flats and their balconies.

Although the scaffold provided useful access to the elevation, it also created the project’s main limitation. Fixed horizontal scaffold boards crossed part of the gutter line, preventing the team from inspecting the concealed section beneath them.

Rather than disturbing the scaffold without authorisation or making assumptions about an area that could not be seen, our operatives clearly recorded the restriction. They inspected every accessible part of the roof, gutter and surrounding wall and set out the next steps should further investigation become necessary.

This transparent approach gave the client a reliable account of what had been checked, what remained concealed and when a return visit would be appropriate.

The Process

The process began inside the affected flat, where the team inspected the reported signs of water ingress and took moisture readings around the area.

Readings of approximately 48–50 suggested a historic or intermittent moisture issue. However, moisture readings alone cannot confirm the precise point of entry. They must be considered alongside the condition of the external building fabric, recent weather and any previous maintenance work.

From the scaffold, the team inspected the visible roof, gutter line and rendered wall. No penetrations, open joints or other obvious defects were found in the accessible sections.

The wall close to the gutter line had recently been rendered and still appeared fresh. Based on the available evidence, the team considered that water may previously have entered through the exposed wall before the render was applied. The new render may therefore have already addressed the original route of ingress.

However, because part of the gutter line remained hidden beneath the secured scaffold boards, it was not possible to rule out a defect within that concealed section.

The Solution

Where there is no visible active defect, carrying out speculative repairs can create unnecessary expense without resolving the actual cause of the problem.

For this reason, Spectrum recommended monitoring the internal area during the next period of rainfall. This would help establish whether the ingress was still active following the recent render work.

If no further moisture appeared, it would support the view that the previous route of entry had already been resolved. If the ingress returned, the next step would be to arrange access beneath the fixed scaffold boards and inspect the concealed gutter section.

This gave the property management team a proportionate plan based on the evidence available, rather than an open-ended recommendation for remedial work.

Completing the Balcony Leadwork

During the same visit, our operatives attended the second balcony and inspected leadwork that had previously been installed.

The existing installation appeared sound. As requested, the team then fitted additional lead along the balcony’s side upstands, improving protection around these vulnerable junctions.

Leadwork is commonly used around roof and balcony details because it can be shaped closely around adjoining surfaces. Correctly installed, it creates a durable barrier that directs water away from joints where ingress is more likely to develop.

By completing this additional work during the same attendance, Spectrum helped the client resolve two separate maintenance requirements without arranging another mobilisation.

The Challenges

The greatest challenge was the restricted access created by the existing scaffold.

Although the scaffold allowed the team to inspect much of the external area, the secured boards prevented a complete assessment of the gutter line. It was therefore important to distinguish between the areas that had been inspected and those that remained concealed.

The recently applied render also required careful consideration. The team needed to determine whether there was evidence of an active defect or whether the reported ingress could relate to an earlier issue that had since been addressed.

Our operatives responded by documenting the visible conditions, avoiding unsupported conclusions and recommending a clear monitoring process. This ensured the client had useful information for future decision-making without being encouraged to commission work that could not yet be justified.

The Result

In one day, Spectrum assessed two flats, recorded moisture readings, inspected the accessible roof, wall and gutter areas, and completed the requested balcony leadwork.

No visible defect was found in the accessible sections surrounding the reported ingress. The client received a practical monitoring plan, together with a clear recommendation for further investigation only if water ingress reappeared.

The additional balcony leadwork was also completed during the same visit, extending the protection along the side upstands and making efficient use of the team’s time on site.

This project demonstrates the value of a measured approach to leak investigation. Sometimes, the most responsible solution is not to begin immediate repairs, but to gather evidence, explain the limitations and provide a structured route forward.

For property managers, this creates greater clarity, avoids unnecessary work and supports the long-term care of the building.