flat roof waterproofing

https://roofleakinspectionscope.alderbrief.com/posts/a-practical-guide-to-roof-leak-inspection-for-homeowners

To keep a flat roof from leaking, you have to think about water pooling rather than running off. Most fixes involve layering a durable membrane—like modified bitumen, PVC, or EPDM rubber—over the existing surface, sealing seams with heat or adhesive. Proper drainage and flashing around edges are just as critical: even the best waterproofing fails if water backs up against walls or vents. It's a careful balance between a solid vapor barrier and a flexible outer coating that expands with temperat…