26 September 2006
Use thermal and acoustical insulation with a flame spread (FS) rating not higher
than 75, and a smoke developed (SD) rating not higher than 150 when tested in
accordance with ASTM E84 (NFPA 255), Standard Method of Test of Surface
Burning Characteristics of Building Materials. Test cellular plastic insulation in
the same densities and thicknesses as the material that will be used in
Exceptions to Insulation Criteria.
For certain types of insulation installation, the exceptions described in
paragraphs 2-7.2.1 and 2-7.2.2 apply.
Flame Spread - No Smoke Developed Rating Limitation.
Compliance with the SD rating limitation is not required, and a FS rating up to
100 is permitted for insulation, including insulating sheathing installed within wall
assemblies. In such installations, conform the interior finish materials to
paragraph 2-6 with a minimum fire-resistance rating of 15 minutes when tested in
accordance with ASTM E119, Standard Test Methods for Fire Tests of Building
Construction and Materials.
No Flame Spread or Smoke Limitation.
Compliance with FS and SD limitations are not required for the following
Insulation installed above poured concrete or poured gypsum roof
decks, nominal 50.8 mm (2-inch) thick tongue-and-groove wood
plank roof decks, or precast roof deck panels or planks that are
approved by a NRTL, as noncombustible roof deck construction.
Insulation installed above roof decks where the entire roof
construction assembly, including the insulation, is UL listed as Fire
Classified, or FM approved for Class I roof deck construction or
equal listing or classification by a NRTL.
Insulation contained entirely within panels where the entire panel
assembly used in the construction application meets the cited FS
and SD limitations.
Insulation isolated from the interior of the building by masonry
walls, masonry cavity walls, insulation encased in masonry cores,
or concrete floors.