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  • Results 1 to 6 of 6

    Thread: Spacing in Retaining Wall - To Fill or Not to Fill?

    1. #1
      Mutchinator is offline Member
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      Spacing in Retaining Wall - To Fill or Not to Fill?

      Hi - I am coming up on mortaring any large block protrusions and fill in gaps in block walls. Question - how accommodating is underlayment/liner to gaps in subsurface? I will be laying underlayment under entire liner for main pond - and then will double up any edges and areas which may cause additional stress on liner. Note I will fill the horizontal shelf between first and second wall with stone and soil to provide a better surface for liner.

      Using Firestone 45 epdm.

      Major concern is this retaining wall which was built by initial excavator band has been a concern ever since.

      Gaps are 1-1.5” - I can mortar if needed or foam.

      Suggestions between I begin install of underlayment and liner?

      Thanks much - Jason






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    2. #2
      cottagefog is offline Senior Member
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      If it was my pond and the gaps were giving me those concerns that you have, I would run to the local home improvement store and get me 2 maybe 3 cans of expandable foam.

      Clean and fill those gaps with the foam. $11.00 invested for peace of mind.

    3. #3
      msegger is offline Senior Member
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      foam it as mentioned, then trim it with a long saw blade. 1.5in gap could show through and possibly create some weakness points. Also the foam might help prevent water from getting behind the liner.

    4. #4
      tbullard is offline Senior Member
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      Instead of spray foam just get foam board and cover that section of wall. Will give you a nice thick padded under layment

    5. #5
      Mutchinator is offline Member
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      Quote Originally Posted by tbullard View Post
      Instead of spray foam just get foam board and cover that section of wall. Will give you a nice thick padded under layment
      I may give that a shot or find something more flexible as the walk is not at all plumb. So the blocks stick out at different depths. I will give it a shot - great idea.


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    6. #6
      REVIV is offline Member
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      Watching your build thread - good job!
      I am over in Ohio and, like you, have been working hard to get the bottom in by winter.
      Glad to say I am finally there - still have some blocks to fill so they don't freeze and break.
      I think it is hard for most to understand the ongoing battle with water, erosion, and mud during and on top of construction.

      I did use foamboard between the walls and EPDM and like it, but there was one thing that surprised me and wanted to point out in case you have the same issue.
      I got some ground water between the liner and ground after I got the liner installed and a few of the foamboards floated up.
      I was able to slip a sump pump beside the liner, pump out the ground water, and push the boards back down as the pond filled and then held the board in place.

      As far as this thread, I was also pleased with how well I was able to fill some craters in my side wall by plastering with mortar. I also used spray foam for some gaps in the board. I think either spray foam or mortar will work for you.

      Picture below shows foamboard and half full.
      Name:  ready for winter.PNG
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