[Code of Federal Regulations]
[Title 24, Volume 5]
[Revised as of April 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 24CFR3280.207]

[Page 119-120]
 
                 TITLE 24--HOUSING AND URBAN DEVELOPMENT
 
 CHAPTER XX--OFFICE OF ASSISTANT SECRETARY FOR HOUSING--FEDERAL HOUSING 
        COMMISSIONER, DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT
 
PART 3280_MANUFACTURED HOME CONSTRUCTION AND SAFETY STANDARDS--Table of Contents
 
                          Subpart C_Fire Safety
 
Sec. 3280.207  Requirements for foam plastic thermal insulating materials.

    (a) General. Foam plastic thermal insulating materials shall not be 
used within the cavity of walls (not including doors) or ceilings or be 
exposed to the interior of the home unless:
    (1) The foam plastic insulating material is protected by an interior 
finish of \5/16\-inch thick gypsum board or equivalent material for all 
cavities where the material is to be installed; or
    (2) The foam plastic is used as a sheathing or siding backerboard, 
and it:
    (i) Has a flame spread rating of 75 or less and a smoke-developed 
rating of 450 or less (not including outer covering of sheathing);
    (ii) Does not exceed \3/8\-inch in thickness; and
    (iii) Is separated from the interior of the manufactured home by a 
minimum of 2 inches of mineral fiber insulation or an equivalent thermal 
barrier; or
    (3) The foam plastic insulating material has been previously 
accepted by the Department for use in wall and/or ceiling cavities of 
manufactured homes, and it is installed in accordance with any 
restrictions imposed at the time of that acceptance; or
    (4) The foam plastic insulating material has been tested as required 
for its location in wall and/or ceiling cavities in accordance with 
testing procedures described in the Illinois Institute of Technology 
Research Institute (IIT) Report, ``Development of Mobile Home Fire Test 
Methods to Judge the Fire-Safe Performance of Foam Plastic Sheathing and 
Cavity Insulation, IITRI Fire and Safety Research Project J-6461, 1979'' 
or other full-scale fire tests accepted by HUD, and it is installed in a 
manner consistent with the way the material was installed in the foam 
plastic test module. The materials must be capable of meeting the 
following acceptance criteria required for their location:
    (i) Wall assemblies. The foam plastic system shall demonstrate 
equivalent or superior performance to the control module as determined 
by:
    (A) Time to reach flashover (600 [deg]C in the upper part of the 
room);
    (B) Time to reach an oxygen (O2) level of 14% (rate of 
O2 depletion), a carbon monoxide (CO) level of 1%, a carbon 
dioxide (CO2) level of 6%, and a smoke level of 0.26 optical 
density/meter measured at 5 feet high in the doorway; and
    (C) Rate of change concentration for O2, CO, 
CO2 and smoke measured 3 inches below the top of the doorway.
    (ii) Ceiling assemblies. A minimum of three valid tests of the foam 
plastic system and one valid test of the control module shall be 
evaluated to determine if the foam plastic system demonstrates 
equivalent or superior performance to the control module. Individual 
factors to be evaluated include intensity of cavity fire (temperature-
time) and post-test damage.
    (iii) Post-test damage assessment for wall and ceiling assemblies. 
The overall performance of each total system shall also be evaluated in 
determining the acceptability of a particular foam plastic insulating 
material.
    (b) All foam plastic thermal insulating materials used in 
manufactured

[[Page 120]]

housing shall have a flame spread rating of 75 or less (not including 
outer covering or sheathing) and a maximum smoke-developed rating of 
450.

[49 FR 32008, Aug. 9, 1984, as amended at 70 FR 72043, Nov. 30, 2005]