Green roofs are designed to support plant growth on the roof surface, offering great benefits like improved insulation and stormwater management. However, they can also present unique challenges around skylights, where leaks commonly occur. The main cause of leaks in these areas is often poor waterproofing or flashings that have been compromised by plant roots, water pooling, or the shifting weight of the green roof layers. Skylights add complexity because they require well-sealed edges where the glass meets the roof membrane. Simple diagnostics include checking for visible cracks or gaps in the sealant around the skylight, inspecting the flashing for damage, and looking inside for water stains or mold near the skylight frame. Running water gently over the roof while someone watches inside can help pinpoint leaks safely without climbing onto the roof itself.
For safe DIY checks, start by visually inspecting the skylight sealant and adjacent green roof materials after rain or sprinkling water in small sections. Avoid walking on the planted areas to prevent damage. If you suspect issues but can’t find obvious signs, it’s wise to call a professional roofer experienced with green roofs and skylights. When speaking to a contractor, ask specifically how they handle waterproofing around skylights in green roof installations and what warranty coverage they offer for leaks tied to root intrusion or membrane failure. Understanding these details can save you from costly repairs later and ensure the unique weatherproofing needs of your green roof and skylights are properly addressed upfront.