On Thu, 6 Nov 2003 20:37:04 +0000 (UTC), someone wrote:
Dim, those old wives (or old plumbers) tales are BS IMHO.
If the line leaks, you WILL get roots. Tar and plastic will NOT help
if there is a leak, whatever hole (through the tar and plastic) the
water is leaking out of, the root will enter. It is ineffective to
have a leaking line and then try to "discourage" roots.
If you absolutely positively don't want leaks (who does, but if even
more motivated than usual), use an even heavier pipe than code
requires, and/or sleeve it inside a 2nd larger pipe (but then for your
purposes you'd need to pack and seal the ring at each end whereas
usually this is not needed).
Your excavator may think you're nuts, but its your money, have 'em do
it your way.