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Installing a picket fence includes measuring and marking the area where you plan to build the fence, laying out all of the materials, digging post holes, setting the posts using concrete, measuring the rails, attaching the rails, attaching the pickets, and then painting or staining the fence if you chose a wooden fence material. 

Standard post spacing for shadowbox fences is 6 to 8 feet. This spacing ensures proper support for the heavy weight of overlapping pickets and prevents sagging between posts. However, areas with high winds, slopes, or unstable soil conditions may require closer spacing.

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 deciding between fence post foam and concrete, the best choice depends on your specific needs and priorities. Concrete is generally considered stronger and more durable, making it the preferred option for heavy, load-bearing posts. However, expanding foam offers several advantages, such as being more eco-friendly and curing much faster. For smaller fences or those made with lighter materials like vinyl or wire mesh, post foam is a good alternative. While concrete is more affordable, it is also harder to work with and has a longer curing time.