Silt Sock for Erosion Control: Sizes, Pricing & How to Choose

If you have a construction site, drainage channel, or sloped yard that needs perimeter sediment control, silt sock is often the fastest option to get on the ground — no trenching, no stakes driven through utilities, and it goes down in a fraction of the time of silt fence. But silt sock comes in more diameters, fill types, and mesh materials than most buyers expect, and picking the wrong combination means redoing the job or watching sediment blow right past it. This guide breaks down silt sock sizing, what drives pricing, and how to choose the right sock for your project.
 

What Is a Silt Sock?

A silt sock (also called a filter sock or compost filter sock) is a mesh tube filled with compost, wood chips, or another filter media, laid along the contour of a site to intercept sediment-laden runoff while letting filtered water pass through. Unlike silt fence, it needs no trenching or stakes to function — friction and its own weight hold it in place on most grades, though stakes are still recommended on slopes or high-flow areas. If you’re still deciding between the two, our silt fence vs. silt sock comparison walks through when each makes more sense.
 

Common Silt Sock Sizes

Silt sock is sized by diameter, and the right diameter depends on drainage area, slope length, and expected flow volume.

Standard lengths run 10 or 20 feet per section, with sections butted or overlapped to cover the full perimeter run.
 

Fill Material and Mesh: What Affects Performance and Price

Two components determine how a silt sock performs and what it costs:

• Fill material. Compost fill is the most common choice and doubles as a biofilter, actively breaking down some pollutants in runoff, not just trapping sediment. Wood chip and shredded-mulch fills cost less but offer less filtration, and are typically used where budget matters more than water quality performance.
• Mesh/netting type. Biodegradable photodegradable mesh breaks down over several months to a year and is the right call on temporary construction sites where the sock will be removed or left to degrade in place. Synthetic (polypropylene) mesh holds up longer and is the better choice for longer-duration or semi-permanent applications.

Silt Sock Cost: What to Expect

As a general planning range, silt sock typically runs somewhere between $2 and $6 per linear foot, depending on diameter, fill material, and mesh type — 8″ diameter compost-filled sock sits at the low end, 24″ diameter sections at the high end. Buying by the pallet or full truckload brings the per-foot cost down noticeably compared to ordering a handful of 10-foot sections. These figures are a starting point for budgeting, not a quote — get a project-specific number before committing to an order.
 

How to Choose the Right Diameter

Sizing silt sock correctly comes down to matching diameter to how much water and sediment will actually reach it:

1. Estimate your drainage area. Larger contributing drainage areas need larger diameter to handle peak flow without sediment washing over the top.
2. Factor in slope length and steepness. Longer or steeper slopes concentrate more flow at the base — step up a diameter size from what a flat-site drainage-area estimate alone would suggest.
3. Check your local or project-specific SWPPP requirements. Many jurisdictions and site permits specify minimum diameter by drainage area; confirm before ordering rather than after inspection.
4. When in doubt, size up. An oversized sock costs a little more per foot; an undersized one that overtops during a storm event can mean a failed inspection and a redo.

Placement and Staking Basics

Silt sock is laid along the contour perpendicular to water flow, not straight downhill. On flat ground or gentle grades, the sock’s own weight and friction against the surface are often enough to hold it in place. On slopes, high-flow areas, or anywhere wind could shift an empty section before fill settles, stake it every 4-6 feet with wood or rebar stakes driven through the mesh at an angle, leaning slightly upslope to resist the pull of moving water. Overlap adjoining sections by at least a foot rather than butting them end to end, so sediment can’t wash through the seam.
 

Common Mistakes When Buying Silt Sock

• Undersizing diameter for the drainage area — the single most common reason silt sock overtops during a heavy rain event.
• Choosing wood chip fill where compost’s biofiltration is actually required — check your project’s permit or SWPPP requirements before defaulting to the cheaper fill.
• Skipping stakes on sloped ground — fine on flat sites, but a real failure point once there’s any grade or wind exposure.
• Butting sections end-to-end instead of overlapping — creates a gap seam that sediment finds first.

How Many Linear Feet Do You Need? Estimating Quantity

Measure the full perimeter or contour line that needs protection — property line, disturbed-area boundary, or drainage path — and round up to the nearest 10-foot section length. Add roughly 5-10% extra for overlaps at section joints and any adjustments around inlets, trees, or grade changes you find once you’re on site. For anything beyond a small residential lot, it’s worth having our team review your site plan before you order — sizing and quantity are far cheaper to get right the first time than to fix mid-inspection.
 

Silt Sock vs. Silt Fence: Which Fits Your Project?

Silt sock and silt fence solve the same problem in different ways, and the right choice depends on your site more than a blanket preference for one product. Our head-to-head comparison covers installation time, terrain suitability, and regulatory acceptance for both — worth a read if you haven’t settled on a product yet.
 

FAQ: Buying Silt Sock

How long does silt sock last?
Biodegradable-mesh sock typically breaks down over several months to about a year, by design, for temporary construction use. Synthetic mesh sock holds up considerably longer and suits longer-duration or semi-permanent applications.

Can silt sock be reused?
Generally no once it’s captured sediment — the fill and captured material are typically left in place or disposed of per project requirements rather than emptied and reloaded. Some contractors reuse the mesh casing on very light-duty, short-term applications, but it’s the exception, not the norm.

Does silt sock need a permit in Texas?
Silt sock itself doesn’t require a permit, but most construction sites over an acre need an SWPPP that specifies approved perimeter control methods and sizing — confirm your site’s requirements before finalizing diameter and placement.

Is silt sock better than silt fence for a sloped site?
It depends on the slope and flow — see our full comparison guide for a terrain-by-terrain breakdown.

Where to Buy Silt Sock in Texas

Texas Erosion Supply stocks silt sock in standard diameters with both compost and wood chip fill options, in biodegradable and synthetic mesh. Browse our silt sock product line, or contact our team with your drainage area and site conditions and we’ll help you settle on the right diameter, fill, and quantity.