2/22/2024 0 Comments MIRC 7.73 instalingWind exposure category shall be determined on a site-specific basis in accordance with Section R301.2.1.4. The jurisdiction shall fill in this part of the table with the wind speed from the basic wind speed map.The jurisdiction shall fill in this part of the table to indicate the need for protection depending on whether there has been a history of local subterranean termite damage.The jurisdiction shall fill in the frost line depth column with the minimum depth of footing below finish grade. The frost line depth may require deeper footings than indicated in Figure R403.1(1).The grade of masonry units shall be determined from ASTM C 34, C 55, C 62, C 73, C 90, C 129, C 145, C 216 or C 652. The weathering column shall be filled in with the weathering index (i.e., "negligible," "moderate" or "severe") for concrete as determined from the Weathering Probability Map. Weathering may require a higher strength concrete or grade of masonry than necessary to satisfy the structural requirements of this code.For SI: 1 pound per square foot = 0.0479 kPa, 1 mile per hour = 0.447 m/s.
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