Crazy question, How thick is 16/4 lumber, if 4/4 finshes at 3/4"?

[Kelvin]

Hey all, is a 16/4 made up of four 3/4" boards?  That would be 3" not 4".  What would a finished 16/4 board plane up to?  Same with 8/4, 10/4... you get the idea.  Thanks all,
Kelvin

[Tom]

http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr113/fplgtr113.htm

Chapter 5 of the handbook gives dressed, relative to rough nominal, sizes.  There is a hardwood section and a softwood section.   16/4 is 4" nominal and dresses to 3 1/2" dry, or 3 9/16 green, in softwood.

[MrMoo]

16/4 is 4" nominal and dresses to 3 1/2" dry, or 3 9/16 green, in softwood.

Hmm 3 9/16 green. What does it dress to in other colors?   ;D

[KnotBB]

It depends!
At my local hardwood mill finished surfaced and KD 4/4 is 15/16", cut green that's
1 1/8".

Under WWPA rules:  (Western softwoods)
"At manufacturer's option dry 4/4 may be surfaced 25/32" thick.  Unseasoned 1" nominal lumber is to be manufactured 25/32". "

In Select grades (for interior use)
4/4   =  3/4"
8/4   =  1 13/16"
...
12/4 =  2 3/4"

[Dan_Shade]

15/16 or 13/16 for the hardwoods?  I thought it was 13/16 for 4/4 surfaced

[Ron Wenrich]

According to NHLA:

Standard thickness for S2S boards:

3/8" S2S to 3/16"
1/2" S2S to 5/16"
5/8" S2S to 7/16"
3/4" S2S to 9/16"
1" S2S to 13/16"
1-1/4" S2S to 1-1/16
1-1/2" S2S to 1-5/16"
1-3/4" S2S to 1-1/2"
2" S2S to 1-3/4"
2-1/2" S2S to 2-1/4"   
3" S2S to 2-3/4"
3-1/2" S2S to 3-1/4"
4" S2S to 3-3/4"

As for kiln dried"

Rough kiln dried can be 1/16" scant of the target size for less than 2" lumber, and 1/8" less for 2" and up.

What my buyers insist on is that my lumber be sawn 1/8" over for anything less than 8/4 and 1/4" over for 8/4 and up.  You can cut corners, if you like.  Its best to know what your buyer wants before you cut.