How big are foundation anchor bolts?

Answer by  buildingtuff (14)

Usually these anchor bolts are about 3 ft long and 1 inch to 1 1/4 inches long. There is about a foot of thread. There are longer ones but usually not shorter.

Answer by  johnjohn (55)

foundation bolts can be all sizes but most that i have worked with are 1/2inch 3/4inch and 5/8inch and they must be protruding at least 2 inches from concrete

Answer by  LeheckaG (1826)

Foundation-anchor-bolts vary in design, function/use, materials, size, & spacing; the requirements are specified by your-local-building-codes (for-instance, earthquake/seismic-zones require larger-sizes and/or tighter-spacing). Common-sizes range from about 1/2" by 6" to (2" to 4") by 36". Foundation-anchor-bolts usually anchor wood-sills to your-foundation; they can also be used to anchor walls to soils.

Answer by  Latin4 (11170)

City housing codes require that the bolts be 6 to 7"'s. It all depends on what is being constructed. Check with your building department and explain what the project it. You will probably need a permit.

Answer by  Liz59 (10966)

Well usually they should be about 6 to 8 inches in size for the anchor bolts. It depends on what kind of building you are constructing. If it is a school or a hospital or a major building, you may need a bigger size bolt such as 10 to 12 inches.

Answer by  eyeguy (3760)

foundation anchor bolts are regulated by the size of the structure in question. Large homes in the area of 2500 sq ft will require 12 inch bolts in the southern US.