{"format":"cadcraft-library-item","format_version":1,"uuid":"569f55b8-febf-42ce-86a3-c9aab2e23c9e","version":1,"name":"Boston: Massachusetts Residential Code (780 CMR 51), Boston values","kind":"regulation","category":"regulations/building","description":"The Massachusetts state pack for this city — the state code with Boston's row of the state design-criteria tables (Massachusetts BBRS (state table, Boston row); 780 CMR 51 Table R301.2(1), R301.2(2)). Design criteria from www.mass.gov (2025-03-28). Entered from the cited source on 2026-10-27 (research confidence: medium); not yet reviewed by a professional.","maker":"","model":"","ifc":{"class":"IfcControl","predefined":"NOTDEFINED"},"plan":{"layers":[],"entities":[]},"body":null,"params":{},"regulation":{"format":"cadcraft-regulation-pack","version":1,"id":"us-ma-boston","name":"Boston: Massachusetts Residential Code (780 CMR 51), Boston values","jurisdiction":{"country":"US","level":"city","region":"US-MA","name":"Boston"},"base":"us-ma","edition":"Massachusetts Residential Code (780 CMR…","in_force":"2024-10-11","review":{"state":"draft","note":"The Massachusetts state pack for this city — the state code with Boston's row of the state design-criteria tables (Massachusetts BBRS (state table, Boston row); 780 CMR 51 Table R301.2(1), R301.2(2)). Design criteria from www.mass.gov (2025-03-28). Entered from the cited source on 2026-10-27 (research confidence: medium); not yet reviewed by a professional."},"authority":"adopted-law","source":{"name":"Massachusetts BBRS (state table, Boston row), 780 CMR 51 Table R301.2(1), R301.2(2)","url":"https://www.mass.gov/doc/10th-edition-residential-chapter-3-building-planning/download","date":"2025-03-28","checked":"2026-10-27"},"maker":null,"price":null,"criteria":{"ground_snow_load":{"text":"40 psf (Boston row; minimum flat roof snow load 30 psf)","value":40,"unit":"psf"},"wind_speed":{"text":"120 mph (ultimate, Boston row)","value":120,"unit":"mph"},"wind_topographic":{"text":"No"},"seismic_category":{"text":"Yes (as printed; no letter)"},"weathering":{"text":"Severe"},"frost_depth":{"text":"48 in","value":1219.2,"unit":"mm"},"termite":{"text":"Moderate to heavy"},"ice_barrier":{"text":"Yes"},"flood_hazards":{"text":"See R322"},"air_freezing_index":{"text":"1500"}},"tables":[],"rules":[]},"source_attrs":{},"license":{"id":"CC0-1.0","holder":"CadCraft","attribution":"“Boston: Massachusetts Residential Code (780 CMR 51), Boston values” by CadCraft (https://www.mass.gov/doc/10th-edition-residential-chapter-3-building-planning/download), CC0 (https://creativecommons.org/publicdomain/zero/1.0/)","url":"https://creativecommons.org/publicdomain/zero/1.0/"},"provenance":{"library":"librarycraft","item":"569f55b8-febf-42ce-86a3-c9aab2e23c9e","version":1,"sha256":"7602d066889ee7a19b7ae714f22cb1142a10f88828f87bc72dc160e8461d8678","source_file":"us-ma-boston.json","source_sha256":"f5073109ecc20b1b79a47e6d3efebd66455e19f2510c9fdc28ba94d33f22a748","published_at":"2026-10-27T02:07:27Z"}}