Identifying the exact roofing material without visual inspection can be challenging. However, I can suggest some common flat roofing materials that are used, and you can try to identify your roofing material based on their characteristics:
Built-Up Roofing (BUR): This type of roofing consists of multiple layers of asphalt or bitumen and felts. It often has a gravel or mineral surface.
Modified Bitumen: Similar to BUR, but it comes in rolls with a factory-applied mineral or smooth surface.
EPDM (Ethylene Propylene Diene Monomer): A synthetic rubber roofing material available in large rolls. It is typically black and has a smooth or textured surface.
TPO (Thermoplastic Polyolefin): A single-ply roofing membrane that is usually white or light-colored and is heat-welded at the seams.
PVC (Polyvinyl Chloride): Another single-ply membrane that is typically white and heat-welded at the seams.
Metal Roofing: Flat roofs can sometimes have metal materials like aluminum, steel, or copper.
Roof Coatings: In some cases, the flat roof might have a coating applied to it rather than traditional roofing materials.
To properly repair the leak, you should consider reaching out to a professional roofing contractor. They can inspect the roof, identify the specific roofing material, and suggest the best repair method. Remember that flat roof repairs can be tricky, and it's essential to address the issue promptly to avoid further damage.