Sorry, misunderstood your question. I thought you placing liner, then the
rock on top of it. But you're not moving the rock.

Okay, a couple of things.

I don't know what your flow rate is, but I think you would lose too much
water using the foam.

Can you pull the liner so it goes up the side of the stream and a certain
distance back up the underside of the rock so the underside of the rock has
liner on it? If so, apply some marine grade caulk to the underside of the
rock and the top of the liner and press the two together, then keep the
liner in contact with the big rock with smaller rocks.

I've used it before. It's a pain in the butt, but it sure sticks.

You might also try applying a bead of window or bathtub caulk along the
bottom edge of the rock before it gets to the liner. Apply it and then make
it into a "V" shape. When the water gets to this it may drip down into the
stream before it hits the liner.


Joe

On 3/16/04 12:07 PM, "grubber" wrote:

My basic question is, "Is it possible to make a waterproof join between the
pool liner and the immovable rock, and if so, how?"



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