Climate zones from Table 301.1 shall be used in determining the applicable requirements from Chapter 4. Zones 3–4: Add R5 insulative wall sheathing beneath the new siding; Zones 5–8: Add R5 to R6 insulative wall sheathing beneath the new siding. In zones 3 and 4, it's heating and cooling. The earth's tilt, rotation and land/sea distribution affect the global weather patterns we observe. R-38 shall be deemed to satisfy the requirement for R-49 wherever the full height of uncompressed R-38 insulation extends over the wall top plate at the eaves. In zones 5 and higher, it's all about heating. 2. Debris Zone 30 psf 115 mph B Table R301.2(1) Climatic and Geographic Design Criteria IRC adoption: jurisdiction completes table with data applicable to the jurisdiction –for example: 2018 IRC Essentials Yes o r No Workbook Page 39 o Identify or No. Moisture divisions. Atlanta has about 3000 HDD (in 'those annoying imperial units') and is in climate zone 3. While the weather varies from day-to-day at any particular location, over the years, the same type of weather will reoccur. The reoccurring "average weather" found in any particular place is called climate. Alternatively you can search for your zone by county through energy.gov’s here. Insulated wood-frame wall: For Zones 4 to 8: Add R5 insulative sheathing before installing the new siding. In all but Climate Zones 2B and 3B, the IRC requires air-impermeable insulation in direct contact with the underside of the roof deck. For example, most of Canada is in climate zone 750. Subject to Damage from Ice Barrier However, there is an exception. Climate Zones. Notice that the IECC map also shows how moisture impacts the climate zones. TABLE 301.1 CLIMATE ZONES BY COUNTY, ALL ZONES ARE CATEGORY "A" OR, MOIST DESIGNATIONS Climate Zone 4 The International Residential Code (IRC) was created to serve as a complete, comprehensive code regulating the construction of single-family houses, two-family houses (duplexes) and buildings consisting of three or more townhouse units. In zones 1 and 2, cooling is the only important factor. Although the IECC climate zone map here shows only the U.S., you can use the definitions of the climate zones for any location in the world. OR. Just kidding. [partial shown] All buildings within the scope of the IRC are limited to three stories above grade plane. Specifically, ERI scores were increased from 55 to 61 in Climate Zone 5 and from 51 to 57 in Climate Zone 3. to the IRC code exempted IECC Climate Zones 1 through 4 (including the hot-humid and mixed-humid climates) from the requirement to have a Class I or II vapor retarder in wall assemblies. 1. Determine your climate zone. 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