A successful patch needs a known leak source and a sound, compatible surface. Start with a short inspection of the roof assembly and drainage so the repair does not hide moisture or structural damage.

What to check first

  • Check for soft spots and repeated failures.
  • Identify the membrane and old repair products.
  • Make sure water can leave the roof after the repair.

Build a repair plan from evidence

  1. Record the pattern

    Note the indoor location, timing, rain direction, and whether water appears after the rain has stopped. Photos and a simple sketch help compare the symptom with the roof above.

  2. Inspect the likely entry points

    Check visible seams, flashing terminations, penetrations, drains, and wall details. Water can travel within an assembly, so the area directly above a stain is only a starting point.

  3. Match the scope to the damage

    A sound, dry surface with one confirmed defect may suit a localized repair. Wet insulation, soft decking, or repeated failures need investigation before another surface patch.

From the project archive

The rubber boot around a vent pipe can crack and leak water. Sometimes tar is used and gets hard over time and crack.
Historical project photo · Flat Roof Doctor
This is a common area for a skylight to have a leak.
Historical project photo · Flat Roof Doctor
This post on a flat roof have no sleeve. You will notice where the flashing ends is caulking. That is where the water gets in.
Historical project photo · Flat Roof Doctor

Product reference: Bergstrom Industries’ published knowledge catalog. Follow the latest product label and safety information. Historical project examples are educational and are not a specification for every roof.