Time and budgetary pressures show no signs of easing across the construction sector, which is why modular construction is increasingly the answer specifiers and developers are all looking for. Pre-engineered components, a high level of quality control, and labour time savings on site have seen the modular approach being adopted for roof terraces in particular.
Specifiers have long had to work around the limitations of conventional roof terraces, which rely on plastic pedestals, basic concrete paving slabs, costly bespoke substructures and precise coordination between multiple trades. All of these can increase the risk of project delays and cost overruns. With roof terraces typically delivered at the end of a project, when timelines are at their most crucial, the exposure to Liquidated and Ascertained Damages (LADs) can be substantial. For commercial projects, the contingency planning and on-site coordination required is significant.
To provide all stakeholders with a result that would be desired, without the extensive time involved with individual pedestals, or a traditional build on a concrete deck, there are other options to consider using lightweight aluminium structures. These are a great way to construct a solid deck support, without introducing too much weight, and simplifying the whole install and levelling of the terrace.
There are a number of different systems to choose from, but the emerging preference in the trade is one that uses interlocking components rather than screws. Thousands of screws are difficult to adjust once fixed. If a slight tolerance in surface materials has not been accounted for, everything has to be undone and refixed. This simplifies installation, reduces the need for large specialist teams, and unlocks another advantage, this being reusability.
REUSABILITY
If components are screwless and can therefore be fully dismantled without screws seizing or gouging, this means a terrace system can be dismantled and set up again on the same site or a different one entirely. Should a surface become worn, or the waterproofing require repair or replacement, the tiles can be lifted, substructure dismantled, put to one side and reinstalled with the original or a new surface quickly and easily. No other system offers this benefit, and the substructure of a screwed system would most likely have to be scrapped, and replaced with a new system.
As a modular system, spare parts and accessories are always available from stock, to enable an alternative configuration. This, often overlooked benefit, contributes to the sustainability of the overall construction, enabling continous reuseability.
FIRE AND WIND RESISTENCE
Most modular terrace systems are engineered to meet fire and wind resistance requirements as standard. All components including pedestals and joists are tested to achieve Broof(t4), this being the highest fire performance classification for external roof systems under BS EN 13501-5. Systems are designed to also resist wind uplift, using secure locking clips or high strength adhesives tested to meet UK wind conditions. Although there is no specific accreditation to meet, products are tested to withstand gusting in excess of 100mph.
MANAGING DRAINAGE AND SERVICE ACCESS
Drainage is a detail that specifiers cannot afford to overlook. Efficient water drainage is also integral to modular terrace systems and more critical than it might appear. Particularly on porcelain tiles, water pooling in winter months can turn to ice creating a safety hazard. A patent pending innovative clip using a gravity fed capillary siphoning action addresses this issue directly, facilitating drainage from porcelain tiles within one hour, meeting NHBC 9.1.15 guidelines and ensuring standing water never exceeds 5mm in depth or 1m2 in any area. Clips also act as a protective buffer between neighbouring tiles, making removal and reinstallation straightforward. The secured decking is easily lifted to allow for inspections and maintenance of underlying drains and gullys.
DESIGN FLEXIBILITY AND SURFACE CHANGES
Modular roof terrace systems offer adaptability that traditional construction cannot match. Where changing a surface finish conventionally requires significant breaking up and preparation, tiles on a modular system can be removed, replaced or reconfigured with ease, and are easily reuseable on any other site, if they are in good condition, without additional energy input beyond transport. A wide range of finishes, surface options and configurations ensures creative freedom on any project, with integrated planters allowing for greenery to be incorporated seamlessly, along with furniture such as benches, tables, pergolas, parasols to create a fully functional space.
EASE OF INSTALLATION
Programme certainty is a clear benefit that modular terrace systems bring to site. Lightweight components and modular logic mean installation is fast and straightforward, minimising the need for large specialised teams. Beyond handover, components are low maintenance and engineered to withstand extreme weather, moisture and UV exposure over the long term.
A range of specialist system accessories is available for the terrace that requires something different. Maybe there is a curve, or an angle or ramps or steps required. Many issues have been encountered on site before, leading to solutions to make sure the system is fit for purpose. Non-standard becomes standard with a screwless modular roof terrace system.
The shift toward modular terrace systems reflects a fundamental change in how the industry approaches complexity and building at height. Faster to install, easier to maintain, simple to adapt and genuinely reusable, the modular approach is redefining how rooftop spaces are built.
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