The reference in the NDS is NOT the specification for anchor bolts and sill plates. Plan to install one bolt at the end of each 2-inch-by-6-inch treated board you will use as a sill plate. Extreme embedments such as a 1/2” diameter by 10” long wedge anchor to attach a 1” thick fixture to concrete will give an embedment depth of 8-1/2” and allow 1/2” for the nut and washer. 2. Wood sill plates shall be a minimum of 2-inch by 4-inch (51 mm by 102 mm) nominal lumber. Sill plates along braced wall lines in buildings assigned to Seismic Design Category D shall be anchored with not less than 1/2 inch diameter (12.7 mm) anchor bolts with steel plate washers between the foundation sill plate and the nut, or approved anchor straps load-rated in accordance with Section inch bolts with plate washers installed 4 ft. o.c. ... wood sill plate shall be anchored to the foundation with anchor bolts spaced a maximum of 6 feet on center. Anchor bolts are assumed centered to the sill plate. The IRC stipulates that anchor bolts need to be embedded into the concrete a minimum of seven inches, but keep in mind that you need at least 2-3 inches protruding from the concrete to accommodate the pressure treated sill plate, as well as a plate washer and a nut. Concrete to wood connection in the NDS may be used for ledgers and other such components. Wedge anchors for sill plate on existing slab - depth, diameter, spacing? In addition to embedded depth, the minimum diameter required for anchor bolts is 1/2 inch (12.7 mm) per the International Building Code (IBC). It offers a complete engineered anchoring system when used with Simpson Strong-Tie® adhesive. on three story buildings. Anchor bolts are more than wall-to-sill connectors; they serve as your structure's primary form of resistance against several types of building loads. The importance of plate washers will be discussed in this article. Types of bolts: The most common foundation bolts are either mechanical wedge anchors or epoxy bolts, 1/2 inch or on two story buildings, and 5/8 inch bolts with plate washers installed 4 ft. o.c. As with maximum spacing, this is a minimum requirement. Inspection is easy; the head is stamped with rod length and “No Equal” symbol for identification after installation. Playing such a key role, foundation anchor bolts are subject to a broad range of regulations and building codes. Sill plate anchorage shall be in accordance with Sections R403.1.6 and R602.11. The commentary to the WFCM gives precise calculations for design (pages 62 thru 69, 2001 WFCM Commentary. (2) Except as provided in Article 9.23.6.3., anchorage shall be provided by embedding the ends of the first floor joists in concrete, or fastening the sill plate to the foundation with not less than 12.7 mm diam anchor bolts spaced not more than 2.4 m o.c. 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