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A silt fence should be buried in a trench that is 6 to 12 inches deep. A depth of at least 6 to 8 inches is necessary to prevent water and sediment from running underneath the fence. A deeper trench, up to 12 inches, provides better anchoring during wet and windy weather. To ensure proper installation, look for a red line on the silt fence fabric, which often indicates the correct burial depth. Always adhere to local guidelines and regulations; a professional contractor will be familiar with these requirements.

Whether you need a permit to build or install a fence depends on several factors, including your location, the fence's height, its placement in your yard, and the materials used. In many cities and highly populated areas, a permit is required, especially for fences taller than 6 feet. Conversely, rural areas may have fewer restrictions. Typically, backyard privacy fences 6 feet or shorter do not require a permit, while front yard fences often have a lower height limit, sometimes as low as 3.5 feet. There can also be exceptions for properties in mixed residential-commercial zones. It's best to check with your local building inspection or zoning department to understand the specific requirements, height restrictions, and location rules for your area. A professional fence installer can help you navigate this process and often secure the necessary permits for you, though this may extend the project timeline.

When your rolls of silt fence join together, you’ll want to overlap them to make sure they’re still as effective at keeping water out without requiring fastening together. Overlap two sections of the silt fencing so that two sheets of fabric cover the span of two posts. If you want to fasten them together, you can staple them or use a zip tie, depending on whether your posts are metal or wood. 

There are two things you can do to make a fence replacement easier—but keep in mind that easier doesn’t mean better. First, you can use a jack or some other type of machinery to pull the post out of the ground. If that’s not available, a digging bar can help.

Second, you can backfill the hole with gravel rather than creating a concrete footing. Keep in mind, gravel is less secure. You should only use it if you’re installing a lightweight fence or have heavier, clay soil.