Silt Fence | Economy, Contractor & DOT
Staked Fencing or Fabric Only Rolls | Stay in Compliance
The Construction Silt Fence is a great choice for any site, roadside, or clearing area dealing with large amounts of dirt or displaced sediment. Made from reliable filter fabrics, these barriers are installed around sites to contain materials and help prevent materials from leaving a construction area. With high strength and easy installation, these construction fences are a reliable option for any work location.
Fencing is available in models with pre-attached stakes or fabric-only rolls. Fabric options include 50 gram, 70 gram, and 100 gram materials (Economy Grade, Contractor Grade, and DOT Grade, respectively).
Silt Control Fence Technical Specifications
Fence with Stakes
Fabric Only Rolls
Silt Fabric Options
3 x 100' with 11 Stakes
3' x 1500' with 3" Core
|Model||Fabric||Size||# of Stakes||Qty/Pallet|
|Economy-11 Stakes||Economy||100' x 3'||11||25|
|Economy-13 Stakes||Economy||100' x 3'||13||25|
|Economy-17 Stakes||Economy||100' x 3'||17||25|
|Contractor-11 Stakes||Contractor||100' x 3'||11||25|
|Contractor-13 Stakes||Contractor||100' x 3'||13||25|
|Contractor-17 Stakes||Contractor||100' x 3'||17||25|
|DOT-11 Stakes||DOT||100' x 3'||11||25|
|DOT-13 Stakes||DOT||100' x 3'||13||25|
|DOT-17 Stakes||DOT||100' x 3'||17||25|
Silt Fence Fabric Rolls: Available Models
|Economy||Economy||1500' x 3'||12|
|Contractor||Contractor||1500' x 3'||12|
|DOT||DOT||1500' x 3'||12|
Silt Barrier Fabric Specifications
|Property||Test||50 gram||70 gram||100 gram|
|Weave||8x8 weave||11x11 weave||11x11 weave|
|Grab Tensile||ASTM D
|68||98.8 lbs. x
|135 lbs. x
|Grab Elongation||ASTM D
|Mullen Burst||ASTM D 3786||230 psi||205 psi||200 psi|
|Puncture||ASTM D 4833||52 lbs.||50 lbs.||50 lbs.|
|Trapezoid Tear||ASTM D 4533||47 lbs.||52 lbs.||60 lbs.|
|AOS||ASTM D 4751||10 sieve||40 sieve||30 sieve|
|Flow Rate||ASTM D 4491||30 gal/min/ft||24.2
|Permittivity||ASTM D 4491||0.03 sec||0.05 sec||0.1 sec|
|UV Resistance||ASTM D 4355||80% after 500 hrs.||80% after 500 hrs.||80% after 500 hrs.|
Silt Fence Accessories
Additonal stakes or a different size variety than the standard wooden stake are available. For a stronger hold than a wooden stake, check out the Steel T-Post!
The silt barrier fence is typically manufactured from a woven geotextile filter fabric that is then attached to wooden stakes. These stakes should be placed at regular intervals along the site perimeter for the most effective use. When installed correctly and inspected frequently, these fences can be an economical and effective barrier that prevents sediment from leaving a site.
Silt Fencing Design Considerations:
Silt control fencing is offered in several different styles to accommodate different site requirements. Options will include economy fencing, contractor grade fencing, and DOT grade fabrics that can be sold with or without the stakes pre-installed. Visit our page for more information on slurry rates for silt fence.
Fabrics: Geotextile filter fabric used for the fencing is both high in strength and equipped for filtration. This strength keeps sediment effectively contained, while still allowing water and other liquids to pass through the fencing.
- Economy Grade Fabric: 50 grams
- Contractor Grade Fabric: 70 grams
- DOT Grade Fabric: 100 grams
Additional Construction Fencing Designs: In addition to the standard silt fence design, we also offer other construction fencing styles including the following:
- Wire Back Silt Fence
- Orange Safety Barrier
- Silt Fence without Stakes
Additional Wooden Stake sizes and T-Post are also available to help fit the exact needs of a project.
For more information check out our Construction Fencing Overview Page.
Learn about other products commonly used with silt fencing.
Site Selection and Design Use
The commercial grade silt barrier fencing is typically used on construction sites and locations with a relatively small drainage area. It is recommended that runoff in your location be a low-level shallow flow that does not exceed 0.5 cfs.
Drainage Area: The drainage area around your location should not exceed 1/4 acre per 100 feet of fence length, and the slope length above the fence should not exceed 100 ft.
Staked Placement: If you are working with a silt barrier that does not already include pre-attached stakes, options for stakes can include models made from either wood or metal. Oak stakes should typically be at least 5 feet long and have a minimum diameter of 2 inches. Softer woods should be at least 4 inches in diameter.
If metal stakes are used instead, posts should have a minimum weight of 1 to 1.33 lbs./linear foot. These stakes will typically require attachment points, such as hog rings, in order to fasten the filter fabric.
Height of Silt Fence: The height of the silt fence should be between 16" and 34" above the grade.
Standard Strength Fabric: If standard fabric is used in combination with wire mesh, posts should be spaced no more than 10 feet apart.
Heavy Duty Fabric: If extra-strength fabric is used without wire mesh reinforcement, the support posts should be spaced no more than 6 feet apart.
A silt control fence should be erected to eliminate unwanted gaps in the fence. If a continuous roll of fabric is not available, the fabric should overlap from both directions only at stakes or posts with a minimum overlap of 6 inches. A trench should be excavated to backfill the bottom of the fabric fence at least 6 inches below the ground surface. This minimizes entrainment of stormwater runoff.
The design should be able withstand the runoff from a 10-year peak storm event, and once installed, should remain in place until all areas up slope have been permanently stabilized.
Erosion control fencing and barriers like these have limitations and should not be installed along areas where rocks or other hard surfaces will prevent uniform anchoring of fence posts and entrenching of the fence fabric.
Staked silt barriers are not suitable for areas where large amounts of concentrated runoff are likely. If this may occur, consider the use of other BMP's in conjunction with silt fence in order to direct water to settlings ponds. High winds may present a maintenance challenge, as high winds may damage the filter fabric.
When the pores of the fence filter fabric become clogged with sediment, pools of water are likely to form on the uphill side of fence. Siting and design of the silt fence should take this into consideration and care should be taken to avoid further erosion damage.
Our silt barriers should be inspected frequently, as well as after each rainfall event, to ensure that they are intact. If gaps or tears are found, they should be repaired or the fabric should be replaced immediately.
Accumulated sediments should be removed from the fence base when the sediment reaches one-third to one-half the height of the fence to avoid failure. Sediment removal should occur more frequently if accumulated sediment is creating noticeable strain on the fabric. When the silt fence is removed, the accumulated sediment also should be removed.
USEPA (1993) reports the following effectiveness ranges for fencing constructed of filter fabric that are properly installed and well maintained:
- Average Total Suspended Solids Removal: 70 percent
- Sand Removal: 80 to 90 percent
- Silt-loam Removal: 50 to 80 percent,
- Silt-Clay-Loam Removal: 0 to 20 percent.
Removal rates are highly dependent on local conditions and installation.
- Type I (Economy & DOT)
- Type II (Medium & Heavy Duty)
- Type III (Medium & Heavy Duty)
- Dredging Silt Barrier
Other Filtering Devices
Other products that can be used for erosion control are geotextiles and coir fibres, such as coir logs, coir blocks, coir wattles, coir mats, and coir blankets to name a few.
Check out our blog post: Know Your Options for Natural and Synthetic Erosion Control.
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