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Fabric behind walls????.......... We do it at times, mostly do to soils behind the walls and what type of water they will hold. On rivers we use fabric behind our walls but we also install much more gravel. Around here rivers have heavy silt that can clog up some fabrics so most non woven fabrics won't work. We want the smaller fines to move thru the fabric and into the washed gravel, the river will carry these away in a natural stone wall. On other walls we don't , they should have a natural clay soils that don't hold water keeping the gravel back fill clear. That is as long as you follow the rule of capping the wall with a clay cap. In other areas of the country (those who have higher sand content) I would use a fabric.
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