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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