On Sun, 18 Jul 2010 16:23:39 -0400, "James"
wrote:

Exactly how is an interior french drain constructed ????


Same as an outside one- except that you often need to cut a concrete
floor to get to the soil.

Actually Mr. French made a whole lot of different kind of drainage
ditches for farms. It seems like most folks, when they say 'French
drain' are thinking of a ditch filled with gravel- and sometimes a
perforated drain pipe.

I've also seen it used to refer to the perimeter drain formed in a
basement by sinking a 2x4 around the perimeter & pulling it once the
floor is poured.

Jim