I am installing a french drain along the foundation of a residence. I have always place thick plastic sheeting (6mil) up against the trench on the foundation side and on the bottom of the trench. Afterwards I lay 2" of gravel,fabric,pipe,etc. Is it over kill to do this? My reasoning is that it helps force the water away from the house and into the pipe.
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Oh heck no. I go deeper than that myself and typically apply a rubber or asphault-base coating on all the masonry, then put poly over that.
Nobody, anywhere, ever said "this crawlspace is too dry".
