If the garage-roof defect is localised
Once the leak source has been identified, a local reinforced repair can be considered where the defect is limited in area and the surrounding roof and deck remain sound.
See the SealForge Kit for the reinforced local repair system, or use the Flat Roof Leak Help Centre if you are still working out where the water is entering.
Do not treat widespread deterioration, a soft or sagging deck, structural movement or an uncertain leak source as a simple local patch.