Replace Wooden Retaining Wall

Old 09-03-05, 10:12 AM
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Replace Wooden Retaining Wall

The wooden retaining wall (20ft wide x 4ft high) in my front yard is starting to show its age. I'm planning to replace it with the easy to install retaining wall block system. The most difficult part of the project, I think, is dismantling the old wooden wall. Question - Would it be ok if I leave the old wooden wall, as is, and install the retaining wall blocks in front of it and fill the gaps between the old and the new wall with aggregate and soil?

Old 09-04-05, 01:38 AM
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Yes, you should be fine doing it that way. But make sure the soil used to fill in between walls is packed in all the way and fully filled in. If there is any gap between walls and the back wall fails it could lead to unsafe loading of the new wall.
Old 09-04-05, 12:31 PM
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Wooden Retaining Wall

Do not use ordinary soil for filling between the walls.

Follow the instructions for the retaining wall block and fill with gravel or a granular backfill. Compacted soil containing clay is a guarantee for failure. Most problems with retaining walls have little to do with the wall itself. The backfill containing moisture is the cause of failures and short lives.

Old 04-15-09, 12:41 PM
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Replace wood retaining wall

What about attaching the new wall to the old wood wall with the perforated polyethylene cloth? I would think tying the two walls together has merit.
Old 04-18-09, 02:45 PM
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If the old wall is wood it will continue to deteriorate and decompose. Leaving it there will eventually lead to sunken areas. Remove the old wood.

Old 04-20-09, 05:16 AM
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Don't forget about dranage and geo-grid.

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