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Understanding Lumber Thickness |
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Woodmaster,
When I go to my local wood supply store, I see that the wood is marked in a manner other
than the common 1x4, etc. It's more like 4/4 or 6/4... is there a chart that explains this
method?
-Fred |
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Fred,
The lumber you buy at your local lumber yard is usually referred to by the "¼"
system". The quarter system calls out the boards rough thickness in ¼"
increments. The rough thickness refers to the thickness of the board before it has been
planed smooth. For example a board that has a rough thickness of 4/4" was 1"
thick before it was planed. After the board is planed the thickness should be 13/16",
or close to ¾". The table below details this system for rough and surfaced (S2S)*
lumber thickness in inches. |
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Standard Thickness for Rough and Surfaced
Hardwood Lumber |
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| 1/4" System |
Rough Thickness |
Planed Thickness |
| 4/4 |
1" |
13/16" |
| 5/4 |
1-1/4" |
1-1/16" |
| 6/4 |
1-1/2" |
1-5/16" |
| 8/4 |
2" |
1-3/4" |
| 9/4 |
2-1/4" |
2-1/16" |
| 10/4 |
2-1/2" |
2-5/16" |
| 12/4 |
3" |
2-3/4" |
* S2S = Surfaced Two Sides – both sides of the board have been
planed; the edges are usually left rough
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