{"format":"cadcraft-library-item","format_version":1,"uuid":"21a5c513-5be0-4b2d-93c2-dfa346744b1d","version":3,"name":"Montana: Montana State Building Code (IRC as adopted, ARM 24.301)","kind":"regulation","category":"regulations/building","description":"Adopts IRC 2024 (Montana Department of Labor and Industry, Building and Commercial Measurements Bureau; ARM 24.301.154; MAR Notice No. 2026-95). State amendments to the checked rules: riser height, tread depth. Amendments were researched for stairs, ceiling height, light and ventilation only; every other rule (room size, egress, escape openings, electrical, alarms) is the base code's. Entered 202…","maker":"","model":"","ifc":{"class":"IfcControl","predefined":"NOTDEFINED"},"plan":{"layers":[],"entities":[]},"body":null,"params":{},"regulation":{"format":"cadcraft-regulation-pack","version":1,"id":"us-mt","name":"Montana: Montana State Building Code (IRC as adopted, ARM 24.301)","jurisdiction":{"country":"US","level":"state","region":"US-MT","name":"Montana"},"base":"us-irc-2024","edition":"IRC 2024 as adopted, 2026-09-26","in_force":"2026-09-26","review":{"state":"draft","note":"Adopts IRC 2024 (Montana Department of Labor and Industry, Building and Commercial Measurements Bureau; ARM 24.301.154; MAR Notice No. 2026-95). State amendments to the checked rules: riser height, tread depth. Amendments were researched for stairs, ceiling height, light and ventilation only; every other rule (room size, egress, escape openings, electrical, alarms) is the base code's. Entered 202…"},"authority":"adopted-law","source":{"name":"Montana Department of Labor and Industry, Building and Commercial Measurements Bureau, ARM 24.301.154; MAR Notice No. 2…","url":"https://bsd.dli.mt.gov/building-codes-permits/current-codes","date":"2026","checked":"2026-10-27"},"maker":null,"price":null,"criteria":[],"tables":[],"rules":[{"id":"stair.riser.max","applies":"stair","op":"<=","unit":"mm","clause":"ARM 24.301.154 (IRC 2024 R318.7.5.1)","label":"Riser height","note":"State amendment.","value":209.55},{"id":"stair.tread.min","applies":"stair","op":">=","unit":"mm","clause":"ARM 24.301.154 (IRC 2024 R318.7.5.2)","label":"Tread depth","note":"State amendment.","value":228.6}]},"source_attrs":{},"license":{"id":"CC0-1.0","holder":"CadCraft","attribution":"“Montana: Montana State Building Code (IRC as adopted, ARM 24.301)” by CadCraft (https://bsd.dli.mt.gov/building-codes-permits/current-codes), CC0 (https://creativecommons.org/publicdomain/zero/1.0/)","url":"https://creativecommons.org/publicdomain/zero/1.0/"},"provenance":{"library":"librarycraft","item":"21a5c513-5be0-4b2d-93c2-dfa346744b1d","version":3,"sha256":"06ef0cb911ee424129e525c47255385edf41382e5026d7b98adb0d8f3050c23c","source_file":"us-mt.json","source_sha256":"c518bda8ee7f204c32a41b549ece69e884f95ea6e0c3aa3253b8ed69a91502b4","published_at":"2026-10-27T02:07:27Z"}}