Browse Forums General Discussion 1 Nov 30, 2009 10:44 am Hi all, I have a quick question regarding the construction of a treated pine retaining wall that has almost been completed at my house. Do I need to install a lining behind the wall before backfilling? Some advice I have recieved indicates that this is not required some suggest fabric and some suggest plastic. Those that advise that a lining is required do so to stop soil from coming through and as this wall is closed this is not an issue. My concern is moisture behind the wall and the possibility that this will lead to the timber moving or warping over time. Any help is appreciated. Cheers, Dan Re: Treated Pine Retaining Wall 2Nov 30, 2009 12:06 pm Its not a bad idea to line the inside of the wall with black plastic. Its keeps the damp soil of the timber. The timber should not warp if it has been fixed properly to the inside of the posts Re: Treated Pine Retaining Wall 3Nov 30, 2009 12:42 pm Conversely I have seen masonry retaining walls with plastic behind (and no ag. drain) that have buckled under the pressure of water build up. I guess it depends on how much water will collect behind it. Its got to go somewhere. Arfur Re: Treated Pine Retaining Wall 4Nov 30, 2009 3:37 pm Dan, In our first place, I built 4 sleeper high treated pine retaining walls. The top level would often experience vast amounts of storm water which in turn made it's way down behind the wall. As the sleepers were not tight on top of each other some water would weep into the ag drain as designed and the rest through the wall( in severe rains). We eventually removed the treated pine to swap across to concrete link wall more for the look and the sleepers (after 4 years) were still in good nick. I don't think it's all that necessary to line the back of the treated pine. If it's H4 rated it will be fine although prolonged moisture on anything can cause some issues in time. Ozz Built 36sq Plantation "Retreat" on 4460m2 at Spring Mountain, Qld In Living and landscaping.. >>> ... http://retreatspring.blogspot.com Re: Treated Pine Retaining Wall 5Nov 30, 2009 4:38 pm Hi Dan, We had to build a 25mtr long retaining wall that was 2mtrs high at the highest level, we were told that we had to have black plastic lining behind our wall it was art of our councils guide lines. Thank you again Simeon.. I will call my certifier for that. Have a good day 4 5141 DIY, Home Maintenance & Repair Are you going to have the frame exposed or are you cladding it with something. Usually if you are making an exposed frame you would use solid legs around 100x100 or… 3 6580 Iām just in the process of replacing 2 stud walls that have been severely damaged by termites and am planning to use h2 blue pine. I just wanted to if anyone can advise… 0 52851 |