Inspecting a flat roof begins with a detailed visual examination of the surface. Look for signs of damage such as cracks, blisters or discolored areas. Also check the drainage points to ensure they are not blocked and that water is draining properly. Special attention should be paid to the joints and edges of the roof, as these areas are more likely to develop leaks. Next, it is important to check the structural integrity of the roof. Use a moisture detection tool to identify areas where water could seep beneath the surface. Inspect the fasteners and membranes to ensure they are in good condition. If any problems are detected, note them and take steps to repair them quickly to prevent more serious damage.