Final answer:
Requirements for the diameter and depth of foundation anchor bolts have changed over time. It was once common to space them 5 diameters apart side-to-side with a depth of 7-8 diameters, but now it is suggested to space them up to 8 diameters apart and with a depth of up to 15 diameters, depending on the demands of the structure and the specific building codes.
Step-by-step explanation:
Requirements for Foundation Anchor Bolts
The requirements for the diameter and depth of foundation anchor bolts can vary depending on the building codes and the type of structure being anchored. Previously, a common rule of thumb for anchor bolt placement was to space them approximately 5 diameters apart from each other side-to-side, and embed them in the concrete at a depth of 7 to 8 diameters. However, newer guidelines suggest that for better performance and strength, foundation anchor bolts should be spaced up to 8 diameters apart from each other side-to-side, and they should be embedded into the concrete at a depth of up to 15 diameters. This increased depth helps to provide a stronger anchor within the foundation, which is especially important in areas subject to high winds, earthquakes, or heavy loads.
The actual diameter of the anchor bolts can also vary; it is largely determined by the structural loads they need to support and any specific requirements set by the structural design of the building. Manufacturers often provide charts or calculators to help determine the appropriate size and spacing of anchor bolts for a given application.