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On one of the pooling area leaks, I'd already cut away the underlayment and tucked it under the boulder, then used smaller rocks and foam, so that at least the foam would be sticking to rubber and rock,..but the water is still leaking under WAY more than I'd intended. So yes, I can see where a bib liner is in order.Your leak is due to your trying to seal on top of underlayment . GOOOOOOOOOOOOD LUCK ... YOU NEED TO INSTALL A BIB LINER between the boulders . you have underlayment under your boulders yes a very good thing to keep your liner safe but now you have fabric that is like a horizontal straw allowing water to run between the layers .
i would get caulking lots of quality caulking and caulk all across your gravel coat every inch then drop while still wet more gravel on top.
as far as how loud it is you have water falling into the pools a deeper tone. if you place a boulder that is angled so when the water drops it lands like it is running down a ski slope. THIS METHOD CAN ALOMST BECOME SILENT. have the water fall on gravel of 1 to 2" and it can get a tinny sound as the rocks can more around hitting each other a little go smaller and more so but can be washed away
That said, on all the bib liner tutorial videos, they are using the black foam to seal the new piece of epdm around the perimeter, up against the rocks or whatever. Would silicone caulk not be better?, just curious.
Speaking of caulk,...regarding my spillway leak,.. when you say "caulk across the gravel",... is there a specific caulk you recommend, again, I'd think 100% silicone, right?
Great tips on changing the sound of the cascading water. Thanks!