Strengthening Urban Trees for Climate Resilience
Uniseal at NParks | LIAS Arbor Week 2024
On 14 October 2024, Uniseal was honoured to be invited as a speaker at NParks | LIAS Arbor Week, where we presented our research and systems on Tree Root Management and urban resilience.
The sharing focused on a growing concern in many monsoon-prone countries: how heavy rainfall and soil saturation compromise tree stability. While urban trees are vital assets for cooling cities, improving air quality and enhancing biodiversity, they are increasingly vulnerable to extreme weather. When soils become oversaturated during intense storms, root systems lose their anchorage strength, increasing the risk of tree toppling.
A notable case discussed during the presentation was the heavy rainfall event in September 2023 in Singapore, where multiple areas experienced mature trees toppling due to prolonged soil saturation. Such incidents highlight that root protection and water management systems are essential to ensure long-term stability.
Why Tree Root Management Matters
Trees reduce urban heat island effects, support stormwater absorption, enhance biodiversity and improve mental well-being. However, as urban density increases, root zones are often confined by pavements, compacted soils and underground utilities. Without adequate structural soil support and drainage planning, trees face multiple stressors, including root confinement, erosion, waterlogging and mechanical instability. Over time, these factors can weaken anchorage, leading to safety hazards, replanting costs and disruption to public spaces. Tree Root Management Systems must therefore go beyond physical support. They must integrate structural load performance, soil aeration and stormwater flow management within the same design framework.
The Link Between Stormwater and Tree Stability
One key theme of the presentation was the strong relationship between stormwater management and root protection. Poor drainage contributes to root rot, oxygen deprivation and soil instability. During heavy storms, waterlogged soils reduce friction between roots and surrounding soil, increasing the likelihood of uprooting. Modern root protection systems must therefore allow controlled water flow while maintaining soil structure that supports healthy root growth.
Uniseal’s R&D Approach: From GrasCell® RC550 to GrasCell® RC1000
Uniseal shared its research journey in developing modular Tree Root Protection Systems, beginning with GrasCell® RC550, a first-generation system designed to provide protected soil volume beneath pavements while supporting stormwater movement. GrasCell® RC550 has been successfully implemented in projects such as Clementi HDB, Mandai Zoo and Jurong Sports Facility.
As urban trees grow larger and root systems expand laterally, new challenges arise, including pavement damage and underground service conflicts. This led to the development of GrasCell® RC1000, an evolved system that is larger, stronger and faster to install. Manufactured from 100% recycled polypropylene, GrasCell® RC1000 is stackable, modular and multipurpose. It can function not only as a root protection system, but also as stormwater management infrastructure and structural platform support.
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Building Resilient Urban Landscapes
Recent extreme weather events across Asia and Europe underscore the need for resilient urban tree systems. Climate adaptation is not simply about increasing tree numbers, it is about ensuring they survive and thrive under stress.
Through our presentation at Arbor Week, Uniseal reaffirmed our commitment to developing integrated solutions that combine stormwater management, structural engineering and ecological design. By protecting root systems beneath pavements and infrastructure, cities can reduce storm-related tree failures, enhance public safety and strengthen long-term urban resilience.
Tree Root Management is no longer optional, it is a critical component of sustainable urban planning.