Preventing Wind Uplift on Roof Terraces
Roof terraces are highly exposed environments, and wind uplift can place significant pressure on pedestal-supported paving.
In many cases, the weight of the paving slabs provides sufficient stability. On taller buildings, exposed sites or terraces with vulnerable edge and corner zones, however, additional restraint may be required.
A wind uplift adhesive offers a practical way to secure paving slabs to their supporting pedestals without penetrating the waterproofing membrane beneath the terrace.
What Is Wind Uplift?
As wind moves across and around a building, it creates changing pressure across the roof surface.
This can generate an upward force beneath paving slabs, particularly around roof edges, corners and other exposed areas. Where the uplift force is greater than the resistance provided by the slab’s weight, individual units may move or become displaced.
The level of risk depends on several project-specific factors, including:
· Building height and location
· Terrace layout and exposure
· Local wind conditions
· Paving dimensions and weight
· Positioning around roof edges and corners
Wind uplift should therefore be considered during the design stage, rather than being left for the installer to resolve once work begins.
Securing Paving to the Pedestals
The wind uplift adhesive is applied to the pedestal heads before the paving slabs are installed.
Once the slabs are placed, the adhesive creates a secure bond between the paving and its support. This helps resist movement and uplift while retaining the benefits of a raised terrace system.
Water can continue to drain beneath the paving, and the finished surface can still be levelled independently of the roof falls through the pedestal arrangement.
Crucially, the adhesive does not bond the paving to the roof itself. Its purpose is to secure the slabs to the pedestals without introducing mechanical fixings through the waterproofing membrane.
Protecting the Waterproofing Membrane
The waterproofing membrane is one of the most important elements within any roof terrace build-up.
Every penetration requires careful detailing, coordination and long-term consideration. Avoiding unnecessary fixings through the membrane can help reduce complexity and support clearer responsibility between the roofing, paving and terrace packages.
The adhesive operates entirely above the membrane. It forms part of the paving restraint strategy, not the waterproofing system.
The roof build-up must still be designed as a complete system, with the insulation, drainage, pedestals, paving and supporting structure considered together.
Using the Adhesive With SkyFrame
The wind uplift adhesive can also be used where pedestal-supported paving is installed as part of the SkyFrame roof terrace system.
SkyFrame provides a structural platform above the waterproofed roof. Pedestals and paving can then be installed over the frame to create the required terrace level and finished surface.
Where wind calculations identify a need for additional restraint, the adhesive can be applied between the pedestal heads and paving slabs.
SkyFrame and the adhesive perform separate roles. The frame supports the terrace build-up, while the adhesive helps secure the paving against uplift.
Balustrade Fixing Is a Separate Detail
The adhesive is not used to install or secure balustrades.
Balustrades can be fixed directly to the SkyFrame structure without penetrating the waterproofing membrane below, but this is a separate benefit of the system.
SkyFrame does not currently include its own balustrade product. Instead, suitable third-party balustrades can be coordinated and fixed to the frame in line with the project’s structural and compliance requirements.
The paving adhesive secures the slabs to the pedestals. The balustrade is fixed independently to the SkyFrame structure.
A Coordinated Approach
There is no universal wind uplift solution for every roof terrace.
The correct approach should be based on the project’s wind calculations, paving specification, pedestal layout and overall roof build-up.
By considering these requirements early, project teams can improve installation certainty, protect the waterproofing membrane and ensure each component performs the role it was designed to fulfil.
Wind uplift adhesive provides a focused and effective solution for securing pedestal-supported paving in exposed rooftop environments, both on standard pedestal systems and as part of a SkyFrame installation.
