Chapter 7 — FIRE AND SMOKE PROTECTION FEATURES
Section 720 — THERMAL- AND SOUND-INSULATING MATERIALS
2025 California Building Code (Title 24, Part 2) · 2025 edition · ingested 2026-07-07 · California
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720.1 General. ¶
720.1 General. Insulating materials shall comply with the requirements of this section. Where a flame spread index or a smokedeveloped index is specified in this section, such index shall be determined in accordance with ASTM E84 or UL 723. Any material that is subject to an increase in flame spread index or smoke-developed index beyond the limits herein established through the effects of age, moisture or other atmospheric conditions shall not be permitted. Insulating materials, when tested in accordance with the requirements of this section, shall include facings, when used, such as vapor…
720.2 Concealed installation. ¶
720.2 Concealed installation. Insulating materials, where concealed as installed in buildings of any type of construction, shall have a flame spread index of not more than 25 and a smoke-developed index of not more than 450. Exception: Cellulosic fiber loose-fill insulation complying with the requirements of Section 720.6 shall not be required to meet a flame spread index requirement but shall be required to meet a smoke-developed index of not more than 450 when tested in accordance with CAN/ULC S102.2. 720.2.1 Facings. Where such materials are installed in concealed spaces in buildings of…
720.3 Exposed installation. ¶
720.3 Exposed installation. Insulating materials, where exposed as installed in buildings of any type of construction, shall have a flame spread index of not more than 25 and a smoke-developed index of not more than 450. Exception: Cellulosic fiber loose-fill insulation complying with the requirements of Section 720.6 shall not be required to meet a flame spread index requirement but shall be required to meet a smoke-developed index of not more than 450 when tested in accordance with CAN/ULC S102.2. 720.3.1 Attic floors. Exposed insulation materials installed on attic floors shall have a…
720.4 Loose-fill insulation. ¶
720.4 Loose-fill insulation. Loose-fill insulation materials that cannot be mounted in the ASTM E84 or UL 723 apparatus without a screen or artificial supports shall comply with the flame spread and smoke-developed limits of Sections 720.2 and 720.3 when tested in accordance with CAN/ULC S102.2. Exception: Cellulosic fiber loose-fill insulation shall not be required to meet a flame spread index requirement when tested in accordance with CAN/ULC S102.2, provided that such insulation has a smoke-developed index of not more than 450 and complies with the requirements of Section 720.6. 7-42 2025…
720.5 Roof insulation. ¶
720.5 Roof insulation. The use of combustible roof insulation not complying with Sections 720.2 and 720.3 shall be permitted in any type of construction provided that insulation is covered with approved roof coverings directly applied thereto.
720.6 Cellulosic fiber loose-fill insulation and self-supported spray-applied cellulosic insulation. ¶
720.6 Cellulosic fiber loose-fill insulation and self-supported spray-applied cellulosic insulation. Cellulosic fiber loose-fill insulation and self-supported spray-applied cellulosic insulation shall comply with CPSC 16 CFR Parts 1209 and 1404. Each package of such insulating material shall be clearly labeled in accordance with CPSC 16 CFR Parts 1209 and 1404.
720.7 Insulation and covering on pipe and tubing. ¶
720.7 Insulation and covering on pipe and tubing. Insulation and covering on pipe and tubing shall have a flame spread index of not more than 25 and a smoke-developed index of not more than 450. Exception: Insulation and covering on pipe and tubing installed in plenums shall comply with the California Mechanical Code .