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ROOFING INSPECTION & REPAIR ASBESTOS CEMENT ROOFING ASPHALT ROOF SHINGLES SHINGLE LIFE / WEAR FACTORS ASPHALT SHINGLE FAILURE TYPES ALGAE, FUNGUS, LICHENS, MOSS on SHINGLES BLISTERS on ASPHALT SHINGLES CRACKS in FIBERGLASS SHINGLES CUPPING ASPHALT SHINGLES CURLING ASPHALT SHINGLES FISHMOUTHING ASPHALT SHINGLES GRANULE LOSS from SHINGLES HAIL DAMAGED SHINGLES LADDERING & STAIR STEPPING SHINGLES MECHANICAL DAMAGE of SHINGLES MOSS & LICHENS on SHINGLES ORGANIC FELT SHINGLE DEFECTS SPLICE DEFECTS on ASPHALT SHINGLES STAINS on ROOF SHINGLES ATTIC CONDENSATION CAUSE & CURE BUILT UP ROOFS CERTIFICATIONS for ROOFING CONTRACTORS CHIMNEY INSPECTION & REPAIRS CHOOSING A ROOFING CONTRACTOR CLAY TILE ROOFING CONCRETE ROOFING CORRUGATED ROOFING ENERGY SAVINGS in BUILDINGS FIRE RETARDANT PLYWOOD FLAT ROOF MOISTURE & CONDENSATION HEAT TAPES & CABLES on Roofs for Ice Dams LOW SLOPE ROOFING MATERIALS MASONITE WOODRUF FIBERBOARD ROOFING MEMBRANE & SINGLE PLY ROOFS METAL ROOFING TYPES MODIFIED BITUMEN ROOFING ROOF INSPECTION SAFETY & LIMITS ROOF VENTILATION SPECIFICATIONS ROOF VENTING ENERGY SAVING DETAILS SLATE ROOF INSPECTION & REPAIR SOD ROOFING SIDING WOOD STAIN DIAGNOSIS on Building Exteriors STAIN DIAGNOSIS on Roofs STANDARDS for ROOFING STONE ROOFING THATCH ROOFING THERMAL EXPANSION of MATERIALS THERMAL MASS in BUILDINGS THERMAL MASS in UPSTAIRS TILE ROOFING WARRANTIES for ROOF SHINGLES CLASS ACTION SHINGLE LAWSUITS REPORTING SHINGLE FAILURES ROOF FAILURE REPORT FORM WOOD SHAKE & SHINGLE ROOFING WORKMANSHIP & WIND DAMAGE More Information InspectAPedia Blog - News Updates Air Conditioning & Heat Pumps Bookstore Electrical Environment Exteriors Heating Home Inspection Insulate Ventilate Interiors Mold Inspect/Test Plumbing Water Septic Roofing Structure Accuracy & Privacy Policies Contact Us |
Asphalt Shingles Nailed in a Ladder Pattern
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The first photograph here shows a sloppy "ladder pattern" installation of strip-type asphalt shingles. While opinions (and expertise) vary among roofers, this ladder pattern shingle application may not be as durable a roof installation as one which staggered the shingle offsets more than a single six inches (or in this case only 3") left and right with each shingle course.
On other asphalt shingle roofs, particularly older ones, you may notice that the pattern of fishmouth occurrence on an asphalt shingle roof follows a fairly regular or stair-stepped pattern, or it may follow a regular "ladder" like pattern up the roof such as is shown in these photographs.
That's because the fishmouthing is occurring at the butt joints of the shingles where more moisture is passing out of the roof structure into the back side of the shingle above each butt joint.
You can thus determine the actual pattern in which the shingles were applied to the roof. "Laddering," while permitted by some manufacturers and standards, is a less workmanlike shingle installation and may result in a localized early wear area on a roof. Ladder-pattern shingle application shows that the roofer liked to work up the roof from one position for as long as possible before moving.
[Photo of fishmouthed/laddered shingles at right is courtesy of Carl Gerosa, New Rochelle, NY.]
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Use links at the left of each page to navigate this document or to view other topics at this website. Green links show where you are in our document or website. If you just "scroll down" you'll miss some important articles. See links at page left.
ASPHALT ROOF SHINGLES
SHINGLE LIFE / WEAR FACTORS
ASPHALT SHINGLE FAILURE TYPES
ALGAE, FUNGUS, LICHENS, MOSS on SHINGLES
BLACK STAIN REMOVAL & PREVENTION
BLISTERS on ASPHALT SHINGLES
CRACKS in FIBERGLASS SHINGLES
CUPPING ASPHALT SHINGLES
CURLING ASPHALT SHINGLES
FISHMOUTHING ASPHALT SHINGLES
GRANULE LOSS from SHINGLES
HAIL DAMAGED SHINGLES
LADDERING & STAIR STEPPING SHINGLES
MOSS & LICHENS on SHINGLES
ORGANIC FELT SHINGLE DEFECTS
SPLICE DEFECTS on ASPHALT SHINGLES
STAINS on ROOF SHINGLES
WHAT ARE ASPHALT SHINGLES
FIRE RETARDANT PLYWOOD
ROOF INSPECTION SAFETY & LIMITS
ROOF VENTILATION SPECIFICATIONS
ROOF VENTING ENERGY SAVING DETAILS
SLATE ROOF INSPECTION & REPAIR
SLATE ROOF PHOTO LIBRARY
SLATE ROOF INSPECTION CLASS
SOD ROOFING
SIDING WOOD
STAIN DIAGNOSIS on Building Exteriors
STAIN DIAGNOSIS on Roofs
STANDARDS for ROOFING
STONE ROOFING
THATCH ROOFING
THERMAL EXPANSION of MATERIALS
THERMAL MASS in BUILDINGS
THERMAL MASS in UPSTAIRS
TILE ROOFING
WARRANTIES for ROOF SHINGLES
SHINGLE CLASS ACTION
REPORTING SHINGLE FAILURES
ROOF FAILURE REPORT FORM
WORKMANSHIP & WIND DAMAGE
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06/30/2009 - 09/01/1995 - InspectAPedia.com/roof/ShingleLadders.htm - © 2009 - 1988 Copyright Daniel Friedman All Rights Reserved - InspectAPedia® is a Registered U.S. Trademark