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To line the back of Wooden Tongue/Groove seawall or not? I was getting input from Smithy and Charles on my parents bulk head redo but they are offline...so if anyone else is around, I would like to know if simply using top soil from the nursery as fill behind the bulk head would suffice. The marine lumber store said I need to line the planks facing the dirt to hold the fill. Is that necessary? He did not know the details of our property and I did not ask the contractor what he is doing. The materials list does not show any roll of the bulk head lining.
The depth at low tide is 1-2 ft. And 4 or 5 ft at high tide. We are at the end of a salt water canal that gets kind of shallow at the edge and I can see the bottom. Our canal provides a gentle current with ripples that brings baby blues once a year but there is no surf and hardly strong. It freezes over some winters. But it definitely not stagnant and still. The canal turns at the midway mark. With that said, I am wondering if using gravel or rocks or even plastic lining is necessary behind the new tongue/grove planks.
The yard slopes down and sunroom/deck is just a few feet away from the bulk head. I have read that gravel loses soil but in some cases it is needed? But regular dirt fill eventually settles itself...I am just starting to read about providing drainage. Our bulk head lasted since the 50's and my neighbors is still intact and solid after 45 years and it is just a flat smooth bulk head. (not sure how it is built behind the wood. Our contractor was going to simply follow the design we already had, but my desire to incorporate other insurances resulted in adding pilings facing front where as the original had no pilings and was a smooth plank front. My concern is that the plastic will hold all the water that collected from high tide or rain and add stress to the wall. I am starting to think that the tongue and grove is too tight and the high tide would leave the soil in the back to remain wet all the time? I think it is originally 2 x 8 or 10 planks right now which allow for drainage quite well. One side was renovated by my bro 3-4 years ago and he did not tie to a dead man on the right side and it held up perfect from the outside after Sandy. The left also held up, but the old wood broke off and there is erosion of the back yard dirt because he did not get to that side yet. DO we need rocks or even a lining behind the planks?