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BUILDING PLANNING I il ` Exceptions 1 and 2 address situations where, R302.10.I where tested in accordance with CAN/ULC because of the way the material is Installed or because S102.2. of other imposed regulations, the material does not Exception: Cellulosic fiber loose-fill insulation shall not make any significant contribution to a fire. be required to be tested in accordance with CAN/ULC The first exception eliminates the flame spread and S102.2, provided such insulation complies with the smoke-developed indexes for the facing portion of the requirements of Sections R302.10.1 and R302.10.3. '1 insulation if it is installed in substantial contact"with the unexposed surface of the ceiling, floor or wall fin- 4-The main provision establishes that CAN/ULC S102.2 ish. For example, when paper-backed insulation is is used as the test standard to determine the flame placed directly on top of a ceiling, the paper facing is spread and smoke-developed indexes for cellulosic jl not required to meet the smoke and flame spread lim- fiber loose-fill insulation materials that cannot be ! its. If the same material is applied to the underside of a tested using the normal ASTM E84 or UL 723 test roof deck and the paper facing is exposed to the attic method. The exception makes a distinction between space, the paper facing must then meet the general cellulosic fiber insulation that is spray applied using a I{ criteria.The potential for flame spread is greatly dimin- water-mist spray applicator and cellulose loose-fill ished when the facings are installed in direct contact insulation that is poured or blown into place. Spray- with the finish material because of the lack of airspace applied cellulosic fiber insulation can be exposed on to support a fire if the facing were to be exposed to a vertical and horizontal ceiling-type surfaces, so it is source of ignition. See Commentary Figure R302.10.1 tested like any other insulating material.Cellulosic fiber for an example of the various facing provisions. loose-fill insulation that is poured (see commentary to The second exception addresses the fact that cellu- Section R302.10.1, Exception 2) is exempt from the IF losic fiber loose-fill insulation is federally regulated by test procedure described in this section. the Consumer Product Safety Commission (CPSC). R302.10.3 Cellulosic fiber loose-fill insulation. Cellulosic Parts 1209 and 1404 of CPSC 16 CFR contain various fiber loose-fill insulation shall comply with CPSC 16 CFR, requirements that regulate the product to avoid exces- Parts 1209 and 1404. Each package of such insulating mate- y iesferllwaccordance with CAN/ULC 5102.2.sive flammability or significant fire hazards. The rial shall be clearly labeled in accordance with CPSC 16 !I smoke-developed index for cellulosic fiber loose-fill CPR,Parts 1209 and 1404. S+ insulation that is spray applied must be 450 or less, as y Because cellulosic fiber loose-fill Insulation is federally410 Exception 3 points the user to Section R316 forfoam regulated, this section provides the reference to the plastic insulation. Foam plastic materials pose some various federal regulations that are to be used. fl, different problems that are addressed in Section R316. Because the federal regulations have precedence,the { code cannot impose other requirements on this prod- R302.10.2 Loose- fill insulation.Loose-fill insulation mated- uct.Therefore,this section and the reference to it from als that cannot he mounted in the ASTM E84 or UL 723 Section R302.10.1, Exception 2,establish the require- ! apparatus without a screen or artificial supports shall comply ments for this product and provide the exemption from �� with the flame spread and smoke-developed limits of Section the normal ASTM E84 or UL 723 test standards.• -ROOF DECK ROOF RAFTER--I FACING MEETING 26/JW LIMITS IN SECTION R302.10.1 tr ATTIC SPACE/ ,f FACING EXPOSED f -CEILING JOISTS GYPSUM BOARD CEILING FACING EXEMPT FROM FLAME SPREAD II AND SMOKE DEVELOPED LIMITATIONS PER SECTION R30110.1.EXCEPTION 1 FACING IN SUBSTANTIAL CONTACT y1 Figure R302.10.1 !S INSULATION FACING 3-60 2015 INTERNATIONAL RESIDENTIAL CODE°COMMENTARY