Where do codes come from? Multiple organizations have a say in building codes. The International Code Council (ICC) creates both the International Building Code (IBC) and the International Residential Code (IRC). The IRC refers to requirements for detached one- and two-family dwellings and townhouses not more than three stories above grade, while the IBC applies to structures not covered by the IRC. States and local authorities may adopt these codes as created or add their own specific requirements to them. The IBC and IRC are updated every three years; however, the active code in many states is several years behind the most recent issue. The IBC and the IRC dictate what materials meet the requirements for weatherization purposes. In some cases, the building codes identify a single material as allowed but may provide for approved alternate materials as well. The ICC creates Acceptance Criteria that define the testing methods and performance requirements for approval of alternate material under the building code. Acceptance criteria of note for weatherization materials include:
•ICC AC-38 for Water-Resistive Barriers •ICC AC-148 for Flashing Materials •ICC AC-356 Drainage Systems for Plaster or Masonry Veneer
Other trade and standards organizations also have a direct influence on the weatherization materials allowed by the building codes. ASTM International (American Society for Testing and Materials) and the American Architectural Manufacturers Association (AAMA), for example, provide standards and material specifications referenced in the building code for allowed products. 2018 IBC Chapter 14 Exterior Walls 1402.2 Weather protection. Exterior walls shall provide the building with a weather-resistant exterior wall envelope. The exterior wall envelope shall include flashing, as described in Section 1404.4. The exterior wall envelope shall be designed and constructed in such a manner as to prevent the accumulation of water within the wall assembly by providing a water-resistive barrier behind the exterior veneer, as described in Section 1403.2, and a means for draining water that enters the assembly to the exterior. Protection against condensation in the exterior wall assembly shall be provided in accordance with Section 1404.3.
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