Silt Fence Attachment
Attachment refers to properly securing the fabric to the post because it must support 18 inches of water and sediment. Three plastic ties or wire, installed diagonally within the top eight inches of a steel post perform well. Multiple staples or even a small lathe over the fabric is used to secure fabric to wood posts.
The most common problems with silt fence are:
- Improper placement – installing silt fence where it will not store water is a waste of money! How many times do we see silt fence installed in a straight line with water running around the end? Or a long run of silt fence diverting runoff to a low point with little storage area, where the volume easily overtops the fence.
- Improper installation – some vague attempt at trenching, or none at all, with little or no backfill, and thus no compaction.
Posts 8-10 ft. apart and too shallow to stand up against a load and where the fabric is sagging only a few inches above the ground.
Inspectors and contractors who approve payment for a poorly placed or installed silt fence.
Water, especially in volume, is a tremendous force. Because silt fence is mechanically installed in the soil, and supported mechanically, it can detain hundreds of pounds of sediment and water – even a concentrated flow (contrary to general opinion).
Which may bring up the question about wire-backed silt fence? There is a mountain of evidence that properly posted silt fence will retain 18 inches of sediment – without wire. Experience indicates wire may actually inhibit performance if it is in the trench because it interferes with sealing off the trench.
Additionally, wire creates voluminous, expensive disposal costs thus causing greater environmental harm than benefit.