USA & Canada
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WRCLA Western Red Cedar decking is available in a selection of thicknesses, widths and lengths as shown in the table below.
Maximum spans for decking shown in the table are based on a continuous beam with two equal spans and a concentrated load of 220-lb at the center of one span. The true span of the decking board is used, taking into account the thickness of the supporting joist beneath it. Wet end-use conditions and unseasoned (green) lumber sizes are assumed.
|Thickness (in.)||Width (in.)||Grade Category (in.)||Span|
|1-1/4||4||All clear grade categories||16|
|1-1/4||4||All knotty grade categories||12|
|1-1/4||6||All clear and knotty grade categories||16|
|2||4||All clear and knotty grade categories||24|
|2||6||All clear and knotty grade categories||24|
To help figure the amount of decking needed for a project, use the following linear footage calculator:
|To Cover 100 Square Feet of Deck|
|Nominal Size (in.)||Linear Feet|
|1-1/4 x 4||325|
|2 x 4||325|
|1-1/4 x 6||211|
|2 x 6||211|
Check with your local building authority about what span is required in your area.
Common Sizes – Deck Boards
|Nominal (in.)||Nominal (mm)||Actual (in.)||Actual (mm)||Nominal (in.)||Nominal (mm)||Actual (in.)||Actual (mm)|
Note: These are nominal sizes, actual sizes may vary by manufacturer.