APA Trademark Format

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Panel Basics
By Mike Drorbaugh Sr. Eng. Wood Specialist
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http//www.apawood.org
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Wood Structural Panels
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Grading Agencies(third party inspection)

• APA
• TECO
• PFS
• PTL
• CanPly

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Manufacturing Standards
Plywood Only Prescriptive
Plywood OSB Performance
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Veneer Panel Grade
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Species Groups
Strength Stiffness
Group Number
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Species GroupsGroup 1
Group 1
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Structural I
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APA Trademark Format
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Plywood Layup
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Panel Strength Axis
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Strength Axis
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Strength Axis Plywood OSB
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Span Rating Conditions
Strength axis perpendicular to supports
Continuous across 2 or more spans
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Vertical Loads
Roof Span L/240 30 PSF live 10 PSF dead
Floor Span L/360 100 PSF live 10 PSF dead
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Exposure Durability Classifications
EXPOSURE 1
EXTERIOR
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Exposure Durability Levels

• Exposure 1
• Waterproof glue
• Permit D-grade veneer (plywood)
• Exterior
• Waterproof glue
• Minimum C-grade veneer (plywood)

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Use Guide
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Specifying Sanded, Touch Sanded Panels
Thickness, APA Trademark, Grade, Group Number,
Exposure Durability, Panel Size, Number of pieces.
Example ¾ APA A-A, Group 1, Exposure 1, 48 x
96 100 pieces.
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Specifying Performance Rated Panels
Thickness, APA Trademark, Grade, Span Rating,
Exposure Durability, Panel Size, Number of pieces.
Example 23/32 APA Rated Sturd-I-Floor, 24oc,
Exposure 1, 48 x 96 tongue and groove, 100
pieces
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SuggestedReference
L350 G

• Based on 2000 IBC
• Full lateral design example
• Shearwalls
• Diaphragms
• Openings
• Drag struts
• Holddowns
• Deflection

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Shear Wall Design Table
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Panel Buckling
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Dimension StabilityMoisture Relations
3/16
10 MC
36 Expansion 1/16
Expansion
3 MC
7 MC
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Moisture Content ()
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Panel Spacing Plywood OSB
1/8 min.
1/2
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Panel Spacing Plywood OSB
0

• Solutions
• Re-install
• Saw Kerf
• Do Nothing

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Glulam Standards

• ASTM D-3737
• Establishing Stresses for Structural Glued
  Laminated Timber
• ANSI A190.1
• Manufacture of Structural Glued Laminated Timber
• Individual ICC-ES Reports

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Glulam Concept
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Graded Lumber Layup
Bending Stress Distribution
Lumber Quality
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Engineered Lay-ups
Compression zone
Inner zone
Tension zone
Critical Tension Zone
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Beam Strength
Compression zone
Inner zone
Tension zone
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Unbalanced Layup
T.L. Tension Lamination
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Simple Span
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Balanced Layup
T.L. Tension Lamination
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Cantilever or Continuous Span
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How To Specify APA EWS Glulam
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Glulam Design Properties

• Form Y117 Glulam Design Properties and Layup
  Combinations
• Form S475 Glued Laminated Beam Design Tables

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Stock Beam
Camber
2000 Ft. r Southern
3500 Ft. r Western
Zero Camber
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Treated for Exterior UseorNaturally Durable
Species
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Appearance Classifications

• Framing (3-1/2", 5-1/2, 7-1/4 widths)
• Industrial
• Architectural
• Premium

consult local availability for appearance
requirements
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Predictable Performance

• Consistent dimensions
• Straight
• Dry engineered wood products
• Predictable

I-Joist
Relative frequency,
No. 1/DF
Strength Variability
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I-Joist Are More Consistent

• No shrinkage
• No Crowning
• Consistent dimensions
• No Defects
• No Warpage

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Evolution of the I-Joist
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Evolution to Standardization
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Ease and Simplicity of Standard
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Simple Specification
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Typical Details
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Any Questions?