Roof Leak Diagnosis & Repair Inspection

Per NRCA (National Roofing Contractors Association) guidelines, roof leaks must be traced from the interior stain to the actual roof penetration point. Water can travel along rafters, sheathing, and pipes for considerable distances. Systematic tracing works from the stain upward to the roof surface. Electronic leak detection or infrared scanning may be required for flat roofs.

1. Mark interior water stain location and measure from two reference walls

2. Access attic — trace water trails along rafters and sheathing toward source

3. Check above the stain first, but trace uphill along rafters (water travels)

4. Mark suspected entry point(s) from attic side

5. Inspect corresponding roof exterior area — check 10' radius above interior stain

6. For flat roofs: consider electronic leak detection or flood testing

7. Use garden hose to isolate leak area if source is not visually apparent

- Water stain is far from actual roof leak — water runs along rafters

- Multiple entry points — water enters in several places, concentrates at one stain

- Intermittent leak — only occurs with wind-driven rain from specific direction

- Condensation mistaken for leak — attic moisture issues can mimic roof leaks

Per NBC (National Building Code of Canada) R905 and NRCA guidelines, damaged or deteriorated flashing must be replaced, not just sealed over. Step flashing, counter-flashing, pipe boots, and valley flashing are the most common leak sources. Replacement flashing must match or exceed the gauge and material of the original. Flashing must integrate properly with surrounding roofing material.

1. Inspect all flashing for corrosion, cracks, lifted edges, or failed sealant

2. Check step flashing at wall intersections — each piece must overlap properly

3. Verify pipe boot condition — rubber collar not cracked or separated

4. Inspect valley flashing for rust, holes, or shifted position

5. Check chimney counter-flashing — must be embedded in mortar, not surface-mounted

6. Verify kick-out flashing present where roof meets sidewall above gutter

7. Test repaired flashing with water — garden hose from below repair, check attic

- Caulk used instead of proper flashing replacement — temporary fix, fails within 1–2 years

- Pipe boot rubber cracked from UV exposure — most common single-point leak source

- Flashing nail pops — thermal expansion loosens nails over time

- Step flashing too short — wind-driven rain bypasses

Per applicable building codes and industry standards, Interior must meet quality and safety requirements. Follow manufacturer specifications and local code amendments for specific requirements.

1. Visual inspection of all work areas

2. Verify compliance with manufacturer specifications

3. Check material quality and proper installation

4. Confirm safety measures are in place

5. Document findings and any deficiencies

- Substandard materials used

- Installation not per manufacturer specifications

- Weather damage during installation

- Insufficient preparation of existing surfaces

Per applicable building codes and industry standards, Exterior must meet quality and safety requirements. Follow manufacturer specifications and local code amendments for specific requirements.

1. Visual inspection of all work areas

2. Verify compliance with manufacturer specifications

3. Check material quality and proper installation

4. Confirm safety measures are in place

5. Document findings and any deficiencies

- Substandard materials used

- Installation not per manufacturer specifications

- Weather damage during installation

- Insufficient preparation of existing surfaces

Per applicable building codes and industry standards, Shingle must meet quality and safety requirements. Follow manufacturer specifications and local code amendments for specific requirements.

1. Visual inspection of all work areas

2. Verify compliance with manufacturer specifications

3. Check material quality and proper installation

4. Confirm safety measures are in place

5. Document findings and any deficiencies

- Substandard materials used

- Installation not per manufacturer specifications

- Weather damage during installation

- Insufficient preparation of existing surfaces

Per applicable building codes and industry standards, Sealant must meet quality and safety requirements. Follow manufacturer specifications and local code amendments for specific requirements.

1. Visual inspection of all work areas

2. Verify compliance with manufacturer specifications

3. Check material quality and proper installation

4. Confirm safety measures are in place

5. Document findings and any deficiencies

- Substandard materials used

- Installation not per manufacturer specifications

- Weather damage during installation

- Insufficient preparation of existing surfaces

Per applicable building codes and industry standards, Repair must meet quality and safety requirements. Follow manufacturer specifications and local code amendments for specific requirements.

1. Visual inspection of all work areas

2. Verify compliance with manufacturer specifications

3. Check material quality and proper installation

4. Confirm safety measures are in place

5. Document findings and any deficiencies

- Substandard materials used

- Installation not per manufacturer specifications

- Weather damage during installation

- Insufficient preparation of existing surfaces