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ROOFING INSPECTION & REPAIR
AMERICAN CEMWOOD ROOFING
BEST ROOFING PRACTICES
BUILT UP ROOFS
CATHEDRAL CEILING VENTILATION
CERTIFICATIONS for ROOFING CONTRACTORS
CHIMNEY FLASHING Mistakes & Leaks
COLD WEATHER ROOF TROUBLE
DECKS, ROOFTOP CONSTRUCTION
EPDM, RUBBER, PVC ROOFING
EXTRACTIVE BLEEDING on SHINGLES
FIRE RETARDANT PLYWOOD
FLASHING on BUILDINGS
FLAT ROOF MOISTURE & CONDENSATION
Green House or Solarium Roof Leaks
HEAT TAPES & CABLES on Roofs for Ice Dams
ICE DAM PREVENTION
MASONITE WOODRUF FIBERBOARD ROOFING
NOISE CONTROL for ROOFS
PLASTIC ROOFING TYPES
PVC, EPDM, RUBBER ROOFING
ROOF ARCHITECTURAL STYLES - PHOTO GUIDE
ROOF CLEANING RECOMMENDATIONS
ROOF COLOR RECOMMENDATIONS
ROOF INSPECTION SAFETY & LIMITS
ROOF LEAK DIAGNOSIS & REPAIR
ROOF NOISE TRANSMISSION
ROOF REPLACEMENT SNAFUs
ROOFING FELT UNDERLAYMENT REQUIREMENTS
ROOFING MATERIALS, Age, Types
SADDLE CONSTRUCTION at CHIMNEYS
SNOW GUARDS & SNOW BRAKES
STANDARDS for ROOFING
STRESS SKIN INSULATED PANELS
TEST LABS - ROOF SHINGLE
TREES & SHRUBS, TRIM OFF BUILDING
TRUSSES, Floor & Roof
UNDERLAYMENT REQUIREMENTS on ROOFS
VENTILATION in BUILDINGS
WALK-ON ROOF SURFACES
WARRANTIES for ROOF SHINGLES
WORKMANSHIP & ROOF DAMAGE
This roof shingle damage diagnosis article describes the causes and effects of mechanical damage to shingles from a variety of sources: foot traffic, tears, punctures, tool cuts, or damage during shingle installation. The results of mechanical damage to asphalt shingles includes mineral granule loss from the shingles, leaks, or simply shorter roof life. Other common asphalt shingle failure factors discussed in this article series include improper storage and handling of the asphalt shingles before installation, improper nailing, improper flashing (which pertains to any roofing material), and defective asphalt shingle product material leading to thermal splitting, cracking, blistering, staining, and in some cases curling or cupping shingles.
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A roof surface can be damaged resulting in leaks, reduced life, or other troubles by events other than normal sun, wind, and weather exposure. Examples include walking on fragile roof surfaces, walking or twisting and turning while stepping on hot asphalt or modified bitumen roof surfaces, stomping around on slates, wood shakes, wood shingles, cement asbestos or fibe cement shingles, and chopping ice to try to stop an ice dam leak.
Case Study of Damaged Asphalt Roof Shingles
Here we present a series of photographs of asphalt roof damage. A professional investigator documented these conditions and joined in a discussion of the apparent cause of damage shown in each photo. All of these pictures were taken on the North slope of an asphalt shingle Firehalt brand roof.
A windstorm adjuster for TWIA (Texas) inspected an insured's roof with a large amount of granular loss. The roof is in these photos is 10/12 pitch (hip with build ups) and was 11 years old at the time of inspection. The roof is vented by turtle vents (4) and (1) turbine vent only (no ridge vent). The shingles are Firehalt Brand (Certain Teed®) - 30 year shingles. In our opinion the damage was not, however, related to the brand. Roof consultants, manufacturers, suppliers, and building inspectors are invited to Contact Us to offer further diagnostic comments about this case.
Conclusions About These Contributors to Asphalt Shingle Damage & Mineral Granule Loss on This Roof
In our opinion the roof damage was not, however, related to the brand. Roof consultants, manufacturers, suppliers, and building inspectors are invited to Contact Us to offer further diagnostic comments about this case.
Asphalt Shingle Roof Damage from Walking on Fragile Roof Surface
Granule loss or actual shingle damage may occur on a roof being walked-on: walking on any asphalt shingle roof loosens some of the mineral granules from their attachment embedded in the asphalt used to impregnate and coat the shingle.
Walking on shingles that are brittle, cupped, curled, can damage them at any time, perhaps more so if the inspector steps on a raised, curled, or otherwise damaged portion of the shingle, or if the asphalt shingles are simply old, brittle, and fragile, even if flat.
We investigated a complaint against a home inspector charged with damaging a roof that we learned he had been smart enough to stay off of - inspecting from the roof edge by ladder. But a contractor, called to bid on roofing repairs, stomped around inspecting the roof to make his repair bid. The result was conversion from a roof that needed replacement soon to one that needed immediate replacement. We could virtually see the footprints of the contractor, in a trail of broken shingles across the roof.
Asphalt Shingle Roof Damage during Other Repair Work
On roof repair work of other components, for example around a chimney, involving standing, moving, turning, placing repair materials on the roof surface without first protecting that surface from damage.
If there is a lot of roof traffic, such as when work is being done on a chimney, you may see "bald" areas of shingles with lost granules where people have been walking. This is damage caused by workers and is not a product defect.
Roof Damage from Walking on very Hot, soft Asphalt Roofing
We think it's subjective, and we don't have a specific number, but the variables underlying roof damage during an on-roof walking inspection include:
Alone no single number answers the questions raised by these factors. But certainly we've both seen damage to roofs when walked on during a hot day - when someone was careless.Thanks to home inspector Charlie Gallagher for suggesting this added detail.
Frequently Asked Questions (FAQs) about causes of damage to roof shingles from mechanical events: walking, punctures, tree limbs, chopping ice, brushing off moss, etc.
Questions & answers or comments about how roof shingles may be damaged, leak, or wear out not from natural means but from events or misuse or abuse..
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Technical Reviewers & References
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