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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.

The safest pool fence depends on your specific needs, such as protecting children and pets. Generally, a fence that is difficult to climb and lacks gaps that a child or pet could slip through is safest. Mesh and tempered glass are very safe options because they are difficult to climb. Mesh fences often meet height requirements, although they may not be the most durable. Solid fences made of wood, concrete, or stone can also be very effective, provided they are high enough to prevent climbing. For additional safety, you could install a pool safety net or a full swimming pool enclosure. Proper maintenance of the pool area is also essential.

The ideal distance between fence posts depends on several factors, including the terrain, the purpose of the fence, and the material used. For different types of fences, here are some general guidelines:

• Wood and Metal Fences: Posts should be spaced between 5 and 8 feet apart.

• Vinyl Fences: Spacing can be between 6 and 8 feet.

• Chain-Link, Mesh, or Lattice Fences: Posts can be set anywhere from 4 to 25 feet apart, with 4-10 feet being common for chain-link.

• Wire Fences: Spacing can be up to 12 feet apart.

Posts for a horizontal fence should be no more than 6 feet apart. Wood pickets are not as strong when mounted horizontally as when mounted vertically. As such, the fence panels on a horizontal fence can’t cover the same span between posts as a vertical fence can. If you install the posts further apart on a horizontal fence, the fence will lose stability, making the boards more likely to sag.