NOminal thicknesses
Physical Properites (all thicknesses)
7.5 mm - 5/16"
9.5 mm - 3/8"
12.5 mm - 1/2"
15.5 mm - 5/8"
18.5 mm - 3/4"
20.5 mm - 13/16"
22.5 mm - 7/8"
25.5 mm - 1"
28.5 mm - 1 1/8"
31.5 mm - 1 1/4"
Glossary of Engineering Properties

 

Place your mouse over the Engineering Property for a detailed description:

Bending Strength is one of the main properties in determining the maximum safe loads for roofs and floors.

Compression and Tension are important to the Engineer for specialized designs and applications, such as roof diaphrams and splice joints.

Shear-Through-Thickness stresses are caused by forces acting along opposites edges of a panel. Such forces are generated in wooden I-joists - where the panel serves as the web in a beam and must carry loads applied to its edges.

Some industrial applications require a panel to carry very high loads over a short span, such as concrete formwork, warehouse storage areas and decking. Planar Shear Strength is very often a limiting property in determining the maximum safe load capacity.

Bending Stiffness is important when it comes to the performance of a floor. Higher stiffness panels make for a floor that doesn't feel bouncy, and will reduce tile popping and cracking.

Compression and Tension are important to the Engineer for specialized designs and applications, such as roof diaphrams and splice joints.

Bearing strength is the ability to resist crushing when a large concentrated load is applied perpendicular to the panel face. Examples include structures where a beam or column must rest on a panel, and industrial applications where the panel must support heavy machinery over a small contact area.

Panel weight is influenced by two main factors - the panel compression during the manufacturing process and the wood species. For the builder, a lighter panel makes for easier handling and installation. For the distributor, the heavier product will cost more to ship.

Orientation is relative to the face grain direction or the panel's long dimension.

“Sheathing” OSB is intended for roof and wall sheathing, and for sub-flooring where a separate underlayment panel must be installed over the OSB.

“Single-floor” OSB is intended for floor sheathing where a separate underlayment is NOT required.

"Sheathing" OSB is intended for roof and wall sheathing, and for sub-flooring where a separate underlayment panel must be installed over the OSB.

DFP - Douglas Fir Plywood manufactured to CSA 0121

CSP - Canadian Softwood Plywood manufactured to CSA 0151

Technical Questions

Paul Jaehrlich, P.Eng
Engineer
Tel:(604) 981-4190
Fax:(604) 985-0342 jaehrlich@canply.org

Download and Print this Page

Download and Print this Section

Please note that you'll need the Adobe Acrobat Reader to open and print this file. We've provided a link to the Adobe site to allow you to download the free Acrobat Reader program.

Plywood Engineering Properties

Comparative Product Data
18.5 mm

  Strength, Stiffness and Rigidity Capacities
Engineering Property Orientation DFP CSP OSB
Single-floor
OSB
Sheathing

Bending
(N•mm/mm)

990 740 480 630

90°

440 440 230 240

Axial Tension (N/mm)

160 140 77 92

90°

71 71 59 59

Axial Compression (N/mm)

210 160 110 110

90°

79 79 100 100

Shear-through
-thickness
(N/mm)

43 46 59 60

90°

43 46 59 60

Planar Shear-
Bending
(N/mm)

9.2 9.7 7.8 7.8

90°

5.4 5.4 4.5 4.4

Planar Shear-
Shear in Plane
(MPa)

0.55 0.72 0.65 0.65

90°

0.55 0.55 0.37 0.37

Bending Stiffness
(N•mm²/mm)

4,600,000 3,400,000 2,800,000 3,800,000

90°

1,300,000 1,300,000 720,000 820,000

Axial Stiffness
in tension or compression
(N/mm)

120,000 95,000 64,000 64,000

90°

47,000 47,000 37,000 37,000

Shear Through Thickness Rigidity (N/mm)

9800 8600 12,000 13,000

90°

9800 8600 12,000 13,000

Bearing Strength
(MPa)


normal to plane of panel 4.5 4.5 4.2 4.2

Panel Weight
(kg)


- 28 25 34 34

Notes:
1) These values are from CSA O86 Engineering Design with Wood and apply to products certified to the following standards: DFP - CSA O121, CSP - CSA O151, OSB - CSA O325. Values have been provided for information purposes only. Complete design information may be found in CSA O86 or in CANPLY publication Plywood Design Fundamentals

2) DFP and CSP values are conservatively derived using the weakest species, worst-case construction and thinnest panel allowed within the respective manufacturing standard.

3)Values for OSB Single Floor are based on a span-rating of 1F24 and a thickness of 18.0 mm.

4)Values for OSB Sheathing are based on a span-rating of 2R48/2F24 and a thickness of 18.0 mm.

5)Orientation is relative to the face grain or the panel's long direction.