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No, fence posts aren’t always set in concrete. If you don’t want to use concrete footings for your posts, expanding foam is a popular alternative. Expanding foam and concrete each have certain pros and cons. For instance, foam is easier to install and more sustainable, but concrete is sturdier and less expensive.

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.

Green branches are more flexible and easier to work with, but they'll shrink as they dry, which can loosen your fence weave over time—so you'll need to weave them extra tight to account for shrinkage. Some species, particularly willow, may also try to sprout when used green. For these reasons, it’s typically easiest to use branches that have dried for a week or two.

The thickness of a glass fence varies widely based on its application and whether or not there are any safety requirements, but most fences are between 8 millimeters and 12 millimeters thick. 12-millimeter-thick glass is extremely strong and overkill in most cases, which is why you typically only see it around pools and in skyscrapers.