what's the meaning of this ?

what do they mean when describing 2/4 or 4/4 when describing finish lumber boards ? I assume it means planed finish, like on 2 sides or 4 sides ? Can someone explain please ?
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On 11 Oct 2006 10:38:29 -0700, " snipped-for-privacy@gmail.com"

It's a measure for rough lumber. 2/4 = 1/2" thick, 4/4 = 1" thick and so on.
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2/4 or 4/4 refers to nominal rough-sawn thickness in inches. Read as two-quarter or four-quarter. Means half-inch and one-inch respectively.
The number of finished sides is given as S2S, S3S, or S4S, meaning "surfaced 2 sides", "... 3 sides", etc. or sometimes just as S2, S3, or S4.
A 4/4 board is 1 inch thick in the rough, and when surfaced two (or more) sides, will be 13/16" thick (if hardwood) or 3/4" thick (if softwood).
--
Regards,
Doug Miller (alphageek at milmac dot com)
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