Flat or partially flat roofs often have drains or scuppers that let rainwater flow away. If these are blocked with leaves, plastic, dirt or other debris, water pools on the surface instead of draining.
Standing water is heavy. Over time, that extra load can stress the structure. It also increases the chance of water finding small cracks or weak spots in the waterproofing and seeping into the building. That can lead to damp patches, peeling paint and damage to ceilings and walls below.
By checking drains regularly and keeping them clear, especially before and during rainy seasons, you help the roof do its job properly. It’s a simple maintenance step that protects not just the roof surface but everything underneath it.