Actual dimensions (cross-section) of lagging boards.
Actual dimensions (cross-section) of lagging boards.
(OP)
AASHTO and FHWA tables regarding lagging design for soldier pile excavation support walls specify lagging board thickness as "rough cut lumber." Is there a standard that identifies the actual dimensions for rough cut lumber? My understanding is rough cut is 1/8" inch larger than the standard (NDS) dressed size. This issue is under debate now as some on my project believe rough cut lumber to mean nominal size equals actual size. Who is correct?





RE: Actual dimensions (cross-section) of lagging boards.
Lumber sizes are established by a voluntary standard issued by the "American Lumber Standard Committee, Inc." Here is a link to download the (free) .pdf version of "American Softwood Standard PS 20". Concerning your question, see Paragraph 5.1 on page 5.
http://www.alsc.org/untreated_ps20_mod.htm
www.SlideRuleEra.net
RE: Actual dimensions (cross-section) of lagging boards.
My point is that you don't need to be too fussy with the actual thickness
RE: Actual dimensions (cross-section) of lagging boards.
Some lagging suppliers try to deliver 3" boards that are mostly 2 1/2" thick. This is a rip off.
I am unaware of any literature that describes a standard for lagging board thinkness. Over many years, this problem has surfaced over and over agin. In fact, I am currently arguing board thickness with a highway consultant. If anyone has a good reference, I'd like to see it. I'll also check out SlideRuleEra's link above. Thanks.