Cedar Lagging in Soldier pile wall
Cedar Lagging in Soldier pile wall
(OP)
I am designing a canal wall using soldier pile with timber lagging. Timber is required due to constraint of being "restoration of historic properties", otherwise I would use concrete lagging. Additionally, I cannot use ANY wood preservatives to treat the timber. The front of the wall will have variable height water and the back of the wall will retain engineered backfill. Considering the wet/dry cycles and soil exposure, this wall seems doomed to rot even using Cedar or Redwood lagging. Regardless, the client wants to move forward using Cedar. Any suggestions for protecting the lagging from rot? I am proposing using a 12 inch wide drainage rock behind the wall wrapped in geotextile separator fabric. Thanks in advance!





RE: Cedar Lagging in Soldier pile wall
RE: Cedar Lagging in Soldier pile wall
Note the "2" designation as the best.
Not only the lagging, but also the piles should be decay resistant. Getting resistant piles may be difficult.
RE: Cedar Lagging in Soldier pile wall
RE: Cedar Lagging in Soldier pile wall
RE: Cedar Lagging in Soldier pile wall
So for your wall, in addition to the drainage fabric,and other features, a sheet of plastic, say 5 mil, against the timber also may help. Of course this assumes your rear fill and drainage materials will prevent a build up of excessive hydro pressure behind the wall.
RE: Cedar Lagging in Soldier pile wall
Mike McCann, PE, SE (WA)
RE: Cedar Lagging in Soldier pile wall
RE: Cedar Lagging in Soldier pile wall
www.PeirceEngineering.com
RE: Cedar Lagging in Soldier pile wall
RE: Cedar Lagging in Soldier pile wall
See attached data sheet.
www.PeirceEngineering.com
RE: Cedar Lagging in Soldier pile wall
The is probably too dense for pressure treatment.This hard wood is probably too dense for pressure treatment.www.PeirceEngineering.com
RE: Cedar Lagging in Soldier pile wall
I like the idea of precast lagging with IPE facing. Maybe flange mount the IPE for easy removal/replacement if necessary?
RE: Cedar Lagging in Soldier pile wall