[Stonehenge]

I've just started the excavation for the patio at my house, which among other things will include a formal water feature. This formal water feature will be sitting on a thick slab of concrete, and retained by mortared limestone on the outside.

I'm wondering if I can/should use a liner other than our usual 45 mil EPDM for this pond. For reference, on top of the liner I also plan to mortar tiles, or more stone, or something, so that you don't see any liner at all.

Any advice?

Thanks in advance.

[Bill Schwab]

Jeff:

I'm not exactly sure about how you are doing this pond, but let me add this one. If you are using flagstone, plaster the inside with mortar usinjg 5 quarts of Acryl 60 per 94 lb bag of mortar. This will alow mortar to adhere better to the stone. After the mortar sets for 3 days, get a couple bags of Thuro-Seal, and mix the Acryl 60 and water with it making a slurry. Paint it on using a stucco brush. You can color it, as long as you don't use more than 1lb of color to one 50lb bag of thuro-seal. Then, mortar the flagstone caps and fill it up to 1/2" below the cap just so the water does not go over the top of the thuro seal.

No liner, no mess. If it ever leaks, smear on more Thuro-Seal.

[Terry D]

We used to do a bunch of work for a pool company ans the designer swore on this stuff called "zypek".

Basically its exactly the same process Bill S. wrote about said except this stuff actually expands when mixed with water.

Its some kind of high tech epoxy based polymer.

There's a big supply house out here called "WhiteCap" and they carry tons of high end stuff for your fountain.

A liner wouldn't even be necessary.

One other thing, I've seen the plumbers out here use roofing firms to actually 'hot mop' their fountains. I'd look into that, if you get a leak you'd have somebody to fall back on. But the technology in hot mopping been around awhile, don't think you'd get a leak for years, then do the Schwab thing and 'smear some more'!http://www.primeresins.com/products.php

[Stonehenge]

Cool - I had a feeling the CA contingent would have a ready answer for this one.