HomeMy WebLinkAboutRPT 2 ROOFING MATER'S 05-03-93REPORTS V0. 2
5-3-93
0,
Inter -Coma
DATE: MAY 3, 1993
TO: WILLIAM A. HUSTON, CITY MANAGER
FROM: COMMUNITY DEVELOPMENT DEPARTMENT
SUBJECT: FIRE RETARDANT WOOD SHARE AND SHINGLE ROOFING MATERIALS
Receive and file.
FISCAL IMPACT
There is no fiscal impact to the City. No additional inspections
are required for the inspection of fire resistive roofing.
At the January 19, 1993 meeting of the City Council, Council member
Thomas requested a report on fire retardant wood shake and shingle
roofs.
Roofing products are assigned a fire retardant classification based
upon independent testing in accordance with Uniform Building Code
Standard No. 32-7. The testing is intended to indicate the
characteristics of roof coverings when exposed to fire. UBC
Standard No. 32-7 establishes four classes of roofing material,
with Class A having the highest level of fire resistance and
nonrated roofing (i.e. untreated wood shakes and shingles) having
no tested fire resistive characteristics.
A summary of fire retardant roofing classifications is as follows:
Class A roof coverings are effective against severe fire test
exposures. Under such exposures, roof coverings of this class are
not readily flammable, afford a fairly high degree of fire
protection to the roof deck, do not slip from position, and are not
expected to produce flying brands.
Class B roof coverings are effective against moderate fire test
exposures. Under such exposures, roof coverings of this class are
not readily flammable, afford a fairly high degree of fire
protection to the roof deck, do not slip from position, and are not
expected to produce flying brands.
May 3, 1993
Page two
Class C roof coverings are effective against light fire test
exposures. Under such exposures, roof coverings of this class are
not readily flammable, afford a fairly high degree of fire
protection to the roof deck, do not slip from position, and are not
expected to produce flying brands.
Nonrated roof coverings are untested for fire resistance or have
failed to pass fire exposure testing.
Requirements for roof coverings are contained in the Uniform
Building Code (UBC) Chapter 32. UBC table 32-A establishes minimum
roof classes. This table has been amended by the City of Tustin to
require a minimum of Class C roofing for residential buildings,
except in hillside areas where a minimum of Class A roof covering
shall be used.
State Assembly Bill No. 2131 will require that, on or after July 1,
1995, all new roofs shall have a minimum of Class C rating. Also,
all reroofs involving 508 or more of the existing roof within a
one-year period will require the installation of Class C roofing.
The City currently requires fire resistive roofing. Our current
roofing requirements are also consistent with the upcoming
requirements from the State.
The 1994 editions of the Uniform Building Codes will be available
for local review, modification, and adoption in the spring of 1995.
During the review and modification period, we may establish more
restrictive roofing standards when substantiated by appropriate
findings based upon local geography, topography, or meteorology.
Modifying Building Codes on a triennial basis is consistent with
State law. If the Council desires to change the current roofing
regulations prior to the next Code Adoption Cycle, this may be done
as an Emergency Amendment to the Code. The process for adopting an
Emergency Amendment also requires the documentation of findings to
establish the local need for the increased requirements.
Wood shakes and shingles are available in nonrated, Class C, and
Class B categories. Our current Building Ordinance does not allow
for the use of nonrated roofing materials. All wood roofs are
required to be a minimum of Class C. Class C and Class B wood
shakes and shingles have fire retardant chemicals pressure cooked
into the wood fiber at the factory. Field applications of fire
retardant chemicals are not accepted for compliance with Class C or
B requirements.
May 3, 1993
Page three
The following cities in Orange County have fire resistive roofing
requirements that are more stringent than the UBC:
CITY
Anaheim
Brea
Buena Park
Costa Mesa
Cypress
Page three
CITY
Fullerton
Garden Grove
Huntington Beach
Irvine
Laguna Beach
La Habra
La Habra Heights
La Palma
Los Alamitos
Newport Beach
Orange
Placentia
Santa Ana
San Clemente
San Juan Capistrano
Seal Beach
Stanton
Tustin
Villa Park
Westminister
Yorba Linda
IL -CW,
Rick Brown
Building Official
RB:roof.m :hm
MINIMUM ROOFING CLASSIFICATION
A & B
C
C
C
C
MINIMUM ROOFING CLASSIFICATION
C
C
C
C
B
C
C
C
C
C
A
C
C
B
C
C
C
A & C
C
B
C
Christine Shingle4yon
Assistant City Manager