Section BL104 — FINISHES — 2025 California Residential Code (Title 24, Part 2.5)

BL104.1 General. ¶

BL104.1 General. The interior and exterior surfaces of hemp-lime walls shall be protected with a finish in accordance with Section BL104. Finishes shall have a vapor permeance rating of 5 perms [285 mg/(s × m [2] × Pa)] or greater tested in accordance with Procedure B of ASTM E96.

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BL104.2 Moisture content prior to application of finish. ¶

BL104.2 Moisture content prior to application of finish. Hemp-lime infill shall have an average moisture content of no more than 20 percent at a depth of 1½ inches (38 mm), as measured from the face of the wall to which the finish will be applied for each wall. Moisture content shall be measured with a probe-style wood moisture equivalent (WME) meter.

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BL104.3 Plaster finish. ¶

BL104.3 Plaster finish. Exterior plaster shall be lime plaster, clay plaster in accordance with Section BL104.3.6.3, or other approved plaster. Interior plasters shall be any plaster permitted in Sections BL104.3.1 through BL104.3.9. Plasters shall be permitted to be applied directly to the surface of the hemp-lime infill without reinforcement, except that the juncture of dissimilar substrates shall be in accordance with Section BL104.5. Plasters shall have a thickness of not less than [1] / 2 inch (13 mm) on the interior and [3] / 4 inch (19 mm) on the exterior and shall be installed in not…

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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BL104.4 Separation of wood and plaster. ¶

BL104.4 Separation of wood and plaster. Wood framing at the exterior surface of hemp-lime walls shall be separated from exterior plaster with Grade D paper or other approved material, except where the wood is naturally durable. Exception: Exterior clay plaster shall not be required to be separated from wood.

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BL104.5 Bridging across dissimilar substrates. ¶

BL104.5 Bridging across dissimilar substrates. Bridging shall be installed onto and across dissimilar substrates prior to the application of plaster on the interior or exterior. Acceptable bridging materials include expanded metal lath, woven wire mesh, welded wire mesh, fiberglass mesh, reed mat, burlap or other approved materials. Bridging shall extend not less than 3 inches (76 mm) on both sides of the juncture. BL104.5.1 Returns on recessed openings. Plaster or other exterior finish returns at recessed windows and doors shall require an approved design that prevents the intrusion of…

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BL104.6 Nonplaster exterior cladding. ¶

BL104.6 Nonplaster exterior cladding. Nonplaster exterior cladding shall be spaced not less than 1 inch (25 mm) from the face of the water-resistive barrier or air barrier to the back of the cladding to allow for ventilation. The ventilation space shall be open at the top and bottom and be provided with insect screening. BL104.6.1 Water-resistive and air barriers. Water-resistive barriers and air barriers, when vapor permeable, are permitted to be applied directly to the hemp-lime when exterior cladding is installed in accordance with Section BL104.6.

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BL104.7 High moisture interior environments. ¶

BL104.7 High moisture interior environments. Exterior hemp-lime walls enclosing showers or steam rooms shall be lined on the interior side with ceramic tiles on an approved tile backer board, ceramic tiles on a lime plaster, or a tadelakt finish.

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