CONCRETE ANCHOR BOLTS
HOW TO SET ANCHOR BOLTS IN CONCRETE

There are basically two types of anchor bolts for concrete; J-bolts and wedge anchors.

J-bolts are set into fresh concrete. This type of anchor bolt is shaped like the letter L, so it can not be pulled out of the concrete after the concrete has hardened.

J-bolt anchoring bolts come in many different lengths, the most common are 6, 8, and 12 inches long. These bolts are threaded at the top, for about two inches, and the rest of the bolt is smooth.

We use this type of concrete anchor bolt on almost all the new concrete slabs we pour. As soon as the slab is poured we go back and sink the anchor bolt down into the concrete, leaving the threaded portion sticking up high enough to secure the walls with a washer and nut.

The J-bolts we use are a half inch in diameter. They come in many diameter widths to accommodate heavier loads. You also have the option to choose an anchor bolt made from regular steel, galvanized or stainless steel.

For the larger and heavier cast in place anchor bolts it may be necessary to use a template or a plastic sleeve to hold the bolt in place until the concrete sets up enough to support the weight of the bolt.

If you are using anchor bolts for concrete slabs or foundations it is important to place the bolt in the concrete so it is in the center of the wall. For 2 x 6 walls the bolt would be 2 3/4 inches from the outer edge and for 2 x 4 walls the anchor bolt would be 1 3/4 inches from the edge.

Use the building plans to mark out the anchor bolt locations before the concrete is poured so a bolt isn't placed in a doorway or directly under a stud.

Click on CONCRETE WEDGE ANCHORS to learn how to secure or fasten things to concrete that has already hardened.

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