Identify the covering before choosing a repair
Felt, EPDM, GRP and asphalt behave differently. A repair material that bonds well to one may be unsuitable for another.
Standing water can point to a fall, outlet or deck problem
A puddle that remains for days can mean the outlet is restricted, the deck has sagged or the roof was laid with too little fall.
Edges deserve close inspection
Wind can lift loose trims, and movement at a wall junction can split an otherwise sound membrane.