French drain gravel should be washed three quarter inch minimum and as large as 1 ½ ” crushed stone. The upper 12 inches above the pipe shall be filled with native soil, to avoid having crushed stone over the perforated pipe that could damage the pipe.Click to see full answer. Then, what kind of stone do you use for a French drain? Gravel Similarly, can you use landscape fabric for French drain? A landscaping French drain is a gravel-filled trench lined with landscape fabric to keep soil and silt out of the gravel. While some types of these drains include a perforated drain pipe (sometimes called drain tile) and may be covered with grass, the traditional French drain is simpler and easier to build. Beside above, what is the best gravel for French drain? The stone should be no less than ¾” and dense (we suggest Granite, or River Gravel) so it will allow good water flow. Lime Rock, although inexpensive, is a poor choice for a French Drain because it will begin to deteriorate over time and eventually begin to pack down and restrict flow.Do you have to use gravel in a French drain?The old way of installing French drains is to do it without the gravel and the fabric. Without the gravel and the fabric, however, the drain can clog up with sand and soil over time.
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