Roof problems are found in nearly 20% of all home inspectionsmaking roofing one of the top three most common defect categories. A thorough roof inspection requires systematic evaluation of covering materials, flashing, drainage systems, penetrations, and structural components.

This comprehensive roof inspection checklist covers everything home inspectors need to evaluate during residential inspections. Use it as a field reference to ensure no critical component is overlooked.

Why Roof Inspection Matters

According to InterNACHI standards, inspectors must inspect roof coverings, drainage systems, flashing, skylights, chimneys, and roof penetrations. Roof defects range from cosmetic issues to active leaks that can cause extensive water damage, mold growth, and structural deterioration.

19.7%Inspections find roof issues
15-30Years typical shingle lifespan
25%Heat loss through roof
$12KAverage replacement cost

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Before You Begin: Inspection Method

Per ASHI and InterNACHI standards, inspectors are not required to walk on roof surfaces. Document your inspection method in the report:

Walked Roof

Direct access to all surfaces. Best for thorough inspection but requires safe conditions—dry surface, proper pitch, secure ladder placement.

Ladder at Eave

View from roof edge without walking. Appropriate when conditions are unsafe or roof material could be damaged by foot traffic.

Ground Level / Binoculars

Limited visibility but sometimes necessary. Document why closer inspection was not possible (weather, height, access restrictions).

Drone Inspection

Aerial view of entire roof surface. Excellent for steep or multi-level roofs. Captures comprehensive photo documentation.

Complete Roof Inspection Checklist

1

Roof Covering Materials

Identify the roof covering type and evaluate its overall condition. Asphalt shingles are most common (80%+ of residential roofs), but inspectors encounter tile, metal, slate, wood shake, and flat membrane systems.

General Assessment

Asphalt Shingle Defects

Tile/Slate/Metal Defects

Common Defects to Document
  • Curling/cupping: UV damage and age cause shingles to dry out and curl upward
  • Granule loss: Exposes asphalt to UV, accelerates deterioration
  • Missing shingles: Wind damage, improper installation, or age
  • Moss growth: Retains moisture, can lift shingle edges
2

Flashing

Flashing failures are one of the most common causes of roof leaks. Inspect all transition areas where the roof meets walls, chimneys, skylights, or other penetrations.

Flashing Inspection Points

Flashing Defects

Critical Flashing Areas
  • Vent pipe boots: Rubber collars crack over time—very common leak source
  • Chimney flashing: Step and counter flashing separation is frequent
  • Valleys: High water concentration makes proper flashing essential
  • Kick-out flashing: Often missing, causes wall water damage
3

Drainage Systems

Proper drainage protects both the roof and foundation. Gutters should be clear, properly sloped, and discharge water away from the structure.

Gutters

Downspouts

Roof Valleys

Drainage Red Flags
  • Sagging gutters: Water pools instead of flowing to downspouts
  • Missing extensions: Water discharges at foundation, causes basement issues
  • Valley debris: Traps moisture, causes rot and leaks
  • Granules in gutters: Sign of advanced shingle deterioration
4

Roof Penetrations

Every penetration through the roof is a potential leak point. Carefully inspect seals, flashing, and condition of all items that pass through the roof surface.

Plumbing Vents

Exhaust Vents

Skylights

Other Penetrations

5

Chimneys

Chimneys require evaluation of both the structure itself and how it interfaces with the roof. Masonry chimneys are particularly prone to deterioration.

Chimney Structure

Chimney-to-Roof Interface

Chimney Red Flags
  • Missing cap: Water enters directly into flue, causes rapid deterioration
  • Cracked crown: Water infiltrates masonry, freeze-thaw damage
  • Separated flashing: Most common chimney leak source
  • Missing cricket: Water pools behind wide chimneys
6

Ventilation

Proper attic ventilation prevents moisture damage, ice dams, and premature shingle deterioration. Balanced intake and exhaust ventilation is essential.

Exhaust Ventilation

Intake Ventilation

Ventilation Issues
  • Blocked soffit vents: Often covered by insulation, reduces airflow
  • Mixing vent types: Can short-circuit airflow pattern
  • Inadequate ventilation: Causes moisture buildup, ice dams, shingle damage
7

Structural Components

While detailed structural evaluation requires attic access, exterior observation can reveal significant issues. Look for signs of sagging, deflection, or structural failure.

Exterior Observation

Signs of Structural Issues

8

Interior Indicators (Attic)

Attic inspection reveals evidence of leaks, ventilation problems, and structural issues not visible from the exterior.

Leak Evidence

Ventilation and Moisture

Structure

Roof Material Lifespan Reference

Roof Material Expected Lifespan Key Deterioration Signs
3-Tab Asphalt Shingles 15-20 years Curling, granule loss, cracking
Architectural Shingles 25-30 years Curling, granule loss, lifting tabs
Wood Shake/Shingle 20-30 years Splitting, curling, moss growth, rot
Metal Roofing 40-70 years Rust, loose fasteners, sealant failure
Clay/Concrete Tile 50+ years Cracked tiles, underlayment failure
Slate 75-100+ years Cracked/missing slates, flashing failure
Flat/Built-Up 15-25 years Blistering, ponding, membrane splits

Photo Documentation Tips

Overall Roof Views

Capture each roof slope from ground level. Include photos from multiple angles showing entire roof surface.

Defect Close-ups

Photograph each defect with context (wide shot) and detail (close-up). Add arrows or circles to highlight issues.

Flashing Details

Document all flashing at chimneys, walls, valleys, and penetrations—especially any areas with visible problems.

Drainage System

Photograph gutters, downspouts, and their discharge points. Document clogs, damage, or improper termination.

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Frequently Asked Questions

How often should roofs be professionally inspected?
Roofs should be inspected at least once per year, plus after any significant storm events. Spring and fall are ideal times—after winter weather and before winter arrives. More frequent inspections are warranted for older roofs or those with known issues.
When should an inspector walk on a roof vs. inspect from ground level?
Walk on roofs when conditions permit safe access—dry surface, appropriate pitch (generally under 6:12), and secure ladder placement. Do not walk on roofs that are wet, icy, steeply pitched, or could be damaged by foot traffic (wood shake, tile, slate). Always document your inspection method in the report.
What are the most common roof defects found during home inspections?
The most common defects include damaged or missing shingles, failed flashing at penetrations and chimneys, clogged gutters, cracked vent pipe boots, and improper ventilation. Flashing failures are the leading cause of roof leaks.
How do I estimate the age of an asphalt shingle roof?
Look for signs of aging: granule loss, curling, cracking, and color fading. Check building permits if accessible. Heavier granule accumulation in gutters indicates advanced wear. Three-tab shingles typically show significant wear at 15-20 years; architectural shingles at 25-30 years.
Should I recommend immediate repair or replacement?
Recommend immediate action for active leaks, safety hazards, or conditions likely to cause imminent damage. For general wear, note the condition and estimated remaining life. Recommend evaluation by a qualified roofing contractor for significant issues. Avoid predicting exact remaining lifespan.
What should I include in my report about roof condition?
Include: inspection method used, roof covering material, estimated age, overall condition assessment, specific defects observed with photos, drainage system condition, and recommendations. For significant issues, recommend further evaluation by a licensed roofing contractor.