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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 (see illustration). 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 (in.) |
| 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 |
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