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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 DORMER TYPES - PHOTO GUIDE
ROOF INSPECTION SAFETY & LIMITS
ROOF JOB PROBLEMS, RESOLVING
ROOF LEAK DIAGNOSIS & REPAIR
ROOF NOISE TRANSMISSION
ROOF REPLACEMENT SNAFUs
ROOFING FELT UNDERLAYMENT REQUIREMENTS
ROOFING MATERIALS, Age, Types
ROOFING TILE SHAPES & PROFILES
ROOFING UNDERLAYMENT BEST PRACTICES
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
ZINC METAL ROOFING
Wood shake roof installation details: here we define wood or cedar shake roofing materials & we discuss wood shake roofing installation details and good practices. Sketch at page top is courtesy of Carson Dunlop Associates. Also see WOOD ROOF INSTALLATION SPECS and see our checklist of wood shingle installation specs at WOOD ROOF INSPECTION GUIDE.
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The roofing shake thickness ranges from 1/2" to 1 1/4" where measured at the shingle butt. The maximum exposure for wood shakes is 7 1/2" (for an 18" long wood shake) or 10" (for a 24" long wood shake), and head lap is 3" or 4" respectively.
A good quality, properly-installed wood shake roof has a life expectancy of 20-40 years. Carson Dunlop's sketch shows the typical cedar shake application pattern and spacing.
Here Carson Dunlop's sketch shows typical cedar shake nailing details & pattern and exposures.
Notice that for this example cedar shake roof a felt interlay is installed between every course of shakes.
More details useful for determining the condition of a wood roof are at WOOD ROOF INSPECTION GUIDE.
As we also discuss at WOOD ROOF INSPECTION GUIDE,
Wood shake exposures for wood shake roofs: the maximum weather exposure for wood shakes or wood shingles depends on the shingle size and the slope or pitch of the roof.
Allowable wood shake exposure may also vary by the shake grade - something that you might infer by visual inspection of the shakes, matching against wood shake grade definitions, or if a wood hake identification label can be located.
Shingle exposure rules for wood shingles (as opposed to shakes) are detailed at WOOD ROOF INSTALLATION SPECS.
Wood shingle or shake keyways or gaps
Wood shake keyways: the gap or space between adjacent wood shingles should be between 1/4" and 3/8" in width.
Wood shake joints & gap alignment: the gaps or keyways described just above for any pair of abutting wood shakes should have a side-lap offset of no less than 1 1/2" from the joints or keyways in adjacent shake courses (horizontal rows of wood shakes across the roof), and in any three wood shake courses no two joints should be in direct alignment (gaps should not be over gaps in any three shake courses).
For added details about proper wood shake roof installation, the most authoritative source of wood shingle and wood shake information is from the Western Red Cedar Shingle & Shake Bureau (now the Cedar and Shake Shingle Bureau, since not only western red cedar is used for roof shingles).
Wood Shake Roof Installation Specifications - Best Practices
[Click any image or table for an enlarged, detailed view.]
-- Adapted with permission from Best Practices Guide to Residential Construction.
Frequently Asked Questions (FAQs) about installing a wood shake or wood shingle roof
Questions & answers or comments about specifications for installation of wood shakes on roofs.
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Technical Reviewers & References
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