The answer to 'how to repair flat roof' is to first inspect the roof for any cracks, holes, or areas of deterioration. Once you have identified the problem areas, you can begin the repair process. For small cracks or holes, you can use a roof sealant or patch to fill and seal the area. For larger or more extensive damage, you may need to replace the affected roofing material or consider a more comprehensive roof repair.
It's important to follow the manufacturer's instructions for the specific roofing materials and sealants you are using. Additionally, be sure to take proper safety precautions, such as wearing non-slip shoes, using fall protection equipment, and working during dry weather conditions.