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BUILDING PLANNING
Lines defining areas are approximate only. Local conditions may be more or less severe than indicated by region classification. A severe classification is where weather conditions result in significant
snowfall combined with extended periods during which there is little or no natural thawing causing deicing salts to be used extensively.
FIGURE R301.2(4) WEATHERING PROBABILITY MAP FOR CONCRETE a, b
a. Alaska and Hawaii are classified as severe and negligible, respectively. b.
2018 INTERNATIONAL RESIDENTIAL CODE ® 45
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