Asphalt Shingle Damage Diagnosis – InterNACHI Inspection Narrative Library

Below you will find examples of damage that has occurred to shingles under various conditions. Click on an individual photo to view a larger version for comparison.

Batch Problems 2 copy

49_Roll_roof_valley_lining_2 copy 2

Open valley 1 copy 2

Screen Shot 2019-05-10 at 4.41.00 AM copy

Good woven valley copy

Valley seams are improperly cut, allowing seepage of water in between shingle layers. Shingle should always overlap instead of being cut to a specific size.

Screen Shot 2019-05-10 at 4.50.08 AM copy

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Cut 1 copy

Califormia cut valley 2 copy

Califormia cut valley 1 copy

Screen Shot 2019-05-10 at 4.41.00 AM copy

Golf ball damage

$Hail fractured mat$

Organic shingle delamination 2

Organic shingle delamination 1

Organic shinge distortion

Raccoon 1

Raccoon 2

Racked installation

Mixing lot numbers

Manufacturing defect

Hitchikers- newer roof

High Nailing fully bonded

Foot traffic

Ferrous_metal_corrosion- manufacturing defect

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Craze cracking 1

Buckled shingles- expanding sheathing

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Blisters- unopened

Blister VS Hail damage

Batch problems 2

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Bird_damage

Biological growth- Algae-zinc

Batch problems 1

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IMG_0107 copy 5

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Algae CU copy

$badly fractured mat$

Blister C2 copy

1981 Patterns of bond failure copy 2

2003 Patterns of bond failure 2 copy

Batch A copy

Screen Shot 2018-11-07 at 1.18.41 PM

2 Minimum_headlap copy

2 Minimum_headlap copy

2 Underlock-coverlock copy 2

1 Walking_concrete_tile copy

3 Eroded_concrete_tiles copy

Wind damage- steep roof- poor bonding copy

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spliced shingle

Wind damage- well bonded roof

Wind damage- steep roof- poor bonding

Wind creases- poorly bonded roof

Tree damage 2

Tree damage 1

P1080426 copy

1 Inadequate sidelap copy 2