Section BL103 — HEMP-LIME CONSTRUCTION — 2025 California Residential Code (Title 24, Part 2.5)

BL103.1 General. ¶

BL103.1 General. Hemp-lime construction shall be limited to the nonstructural, solid infill mix of hemp hurd and its binder between or around structural and nonstructural wall framing. Hemp-lime infill shall have a density ranging from 12.5 lb/ft [3] to 25 lb/ft [3] (200 kg/m [3] to 400 kg/m [3] ). Hemp-lime walls shall be designed and constructed in accordance with Section BL103 and with Figures BL103.1(1) through BL103.1(4) or an approved alternative design. FIGURE BL103.1(1)—TYPICAL HEMP-LIME WITH INTERIOR STUD FRAMING FIGURE BL103.1(2)—TYPICAL HEMP-LIME WITH CENTER STUD FRAMING APPENDIX…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development

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BL103.2 Materials. ¶

BL103.2 Materials. Materials to be used in hemp-lime construction shall be in accordance with Sections BL103.2 through BL103.2.3. BL103.2.1 Hemp hurd. Hemp hurd shall match the specifications of the approved test samples in Sections BL106.3 and BL107.1. Hemp hurd shall be substantially free from dust and fiber clumps such that the installed hemp-lime maintains its integrity. BL103.2.2 Binders. Acceptable binders, singular or in combination, include hydraulic lime, hydrated lime, pozzolans, natural cements or other binders that match the specification of the approved test samples in Sections…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval

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BL103.3 Structure. ¶

BL103.3 Structure. The structure of buildings using hemp-lime infill shall be in accordance with this code and Sections BL103.3.1 through BL103.3.9 or with an approved engineered design by a registered design professional. BL103.3.1 Limitations and requirements for buildings using hemp-lime infill. Buildings using hemp-lime infill shall be subject to the following limitations and requirements: 1. Number of stories: not more than one story above grade plane. 2. The building height shall not be more than 25 feet (7620 mm). on Jul 18, 2025 11:14 AM (CDT) THEREUNDER. APPENDIX BL — HEMP-LIME…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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BL103.4 Contact with metal. ¶

BL103.4 Contact with metal. Metal in contact with hemp-lime shall be stainless steel or primed and painted with a coating in accordance with Section BL103.4.1. BL103.4.1 Protective coatings. Metal shall be painted with an epoxy, oil, bituminous paint or other approved coating. Waterbased paints shall not be used. Exception: Heads of pneumatically driven hot-dip galvanized nails.

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review

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BL103.5 Mechanical, electrical and plumbing in hemp-lime infill. ¶

BL103.5 Mechanical, electrical and plumbing in hemp-lime infill. Electrical and telecommunication wiring, panels and boxes, mechanical ducts, plumbing pipes and other mechanical, electrical and plumbing components in or in contact with hemp-lime infill shall be isolated in sleeves, pipes, conduits or tubing made of plastic, or of metal in accordance with Section BL103.4, or separated from hemp-lime with an approved alkaline-resistant material. APPENDIX BL-6 2025 CALIFORNIA RESIDENTIAL CODE on Jul 18, 2025 11:14 AM (CDT) THEREUNDER. APPENDIX BL — HEMP-LIME (HEMPCRETE) CONSTRUCTION

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling

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BL103.6 Hemp-lime installation methods. ¶

BL103.6 Hemp-lime installation methods. Hemp-lime shall be installed in accordance with Sections BL103.6.1 and BL103.6.2, and one of Sections BL103.6.3 through BL103.6.7. BL103.6.1 Mix and mixing. The materials and ratio of hemp hurd to binder to water shall match the specifications of the approved test samples in Sections BL106.3 and BL107.1. The water-to-binder ratio shall be not less than 1:1 and not greater than 2:1 by weight or by binder manufacturer’s recommendations. The hemp hurd, binder and water shall be thoroughly and uniformly mixed by manual or mechanical means. BL103.6.2…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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BL103.7 Moisture control. ¶

BL103.7 Moisture control. Hemp-lime assemblies shall be protected from water intrusion and damage in accordance with Sections BL103.7.1 through BL103.7.9. BL103.7.1 Water-resistive barriers. Water-resistive barriers are prohibited on hemp-lime walls, except as permitted or required elsewhere in this appendix. BL103.7.2 Vapor retarders. Vapor retarders are prohibited on hemp-lime walls, except as permitted or required elsewhere in this appendix. BL103.7.3 Penetrations in hemp-lime walls. Penetrations in exterior hemp-lime walls shall be sealed with an approved sealant or gasket on the exterior…

provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use provision permitted lot commission district approval parking minimum height dwelling application requirement review coverage subject setback occupancy development standard accessory yard section structure compliance use

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