Roof-top gardens and heavy planters look beautiful, cool the building, and create lovely spaces. But they’re not just decor—they affect the roof’s health.
Soil, pots and constant watering add weight. Roof slabs are designed for specific loads; exceeding them, especially in older buildings, can cause long-term stress. Large planters and thick soil beds need careful planning and, ideally, structural input.
Water is the second big factor. Frequent watering and accidental overflows mean more moisture across the roof surface. If waterproofing isn’t done and protected properly, this moisture can slowly find its way into the slab and cause seepage in top-floor flats.
Good rooftop gardens include layers: a waterproof membrane, protection boards, proper drainage mats, then soil or planters. Drains must remain accessible and clear of roots and debris.
Small setups with limited, raised planters are usually easier to manage than full “green roof” conversions done casually.
A roof garden should be designed like a long-term project—pretty, but also safe for the building underneath.
