Figure 1.
Shaded Area = Placement for Full and Reduced Allowable Load Capacity in Grout-Filled CMU
- Threaded rods must comply with ASTM A 307 minimum.
- Values for 8-inch wide CMU Grade N, Type II concrete masonry units conforming to UBC Standard 21-4 or ASTM C90. The masonry units, when grouted, must be fully grouted with grout complying with UBC Section 2103.4, or IBC Section 2103.12. Mortar is prepared in accordance with Section 2103.3 of the UBC and UBC Standard 21-15, or IBC Section 2103.8. The minimum specified compressive strength of masonry, f'm, at 28 days is 1,500 psi.
- Embedment depth is measured from the outside face of the concrete masonry unit.
- Allowable loads may be increased 33 1/3% for short-term loading due to wind forces or seismic forces where permitted by code.
- Refer to In-Service Temperature Sensitivity chart for allowable load adjustment for temperature.
- The tabulated allowable loads are based on a safety factor of 5.0 for installations under the IBC and IRC. For installations under the UBC use a safety factor of 4.0 (multiply the tabulated allowable loads by 1.25).
- Refer to allowable load adjustment factors for end distance, edge distance and spacing.