O89-53ORDINANCE NO.
AN ORDINANCE OF THE CITY COMMISSION OF
THE CITY OF BOYNTON BEACH, FLORIDA,
AMENDING CHAPTER 5, BUILDING CODE,
SECTION 5-7 STANDARD FOR THE
INSTALLATION OF ROOF COVERINGS CODE BY
ADOPTING THE PALM BEACH COUNT'fWIDE
STANDARD FOR THE INSTALLATION OF ROOF
COVERINGS, 1989 EDITION, REVIEWED AND
RECOMMENDED BY THE BUILDING CODE
ADVISORY BOARD OF PALM BEACH COUNTY AND
BUILDING OFFICIALS ASSOCIATION OF PALM
BEACH COUNTY; PROVIDING A CONFLICTS
CLAUSE; A SEVERABILITY CLAUSE; AUTHORITY
TO CODIFY; AN EFFECTIVE DATE AND FOR
OTHER PURPOSES.
WHEREAS, the City of Boynton Beach is mandated by Palm
Beach County to adopt the same basic construction codes as
all municipalities in Palm Beach County; and
WHEREAS, the Building Code Advisory Board of Palm Beach
County has recommended the adoption of the Palm Beach
Countywide Standard for the Installation of Roof Coverings
reviewed and recommended by the Building Code Advisory Board
of Palm Beach County.
NOW, THEREFORE, BE IT ORDAINED BY THE CITY COMMISSION
OF THE CITY OF BOYNTON BEACH, FLORIDA:
Section 1. That Chapter 5 of the Codified
Ordinances of the City of Boynton Beach, Florida, Section
5-7, "Standard for the Installation of Roof Coverings,
Adopted" is hereby amended to read as follows:
Sec. 5-7 Standard for the Installation
of Roof Coverings, Adopted
The model Palm Beach Countywide Standard
for the Installation of Roof Coverings,
1989 Edition, is hereby adopted and made
a part hereof by reference.
Section 2.
That the addendum listed in Section 1.
is attached hereto and made a part hereof by reference.
Section 3. All ordinances or parts of ordinances in
conflict herewith are hereby repealed.
Section 4. Should any section or provision of this
ordinance or any portion hereof be declared by a Court of
competent jurisdiction to be invalid, such decision
not affect the remainder of this ordinance.
Section 5.
ordinance.
Section 6. This
immediately upon passage.
1989.
shall
Authority is hereby granted to codify said
ordinance shall become effective
FIRST READING this /~ day of %~~~
SECOND, FINAL READING and PASSAGE this ~ day of
1990.
CITY 0 NTON BEACH, FLORIDA
Vice Mayor ' - ~
commissioner
~6mm 't s s ione r ~ -
ATTEST:
City ~r-k
(Corporate Seal)
Commissioner
BUILDING CODE ADVISORY BOARD OF
PALM BEACH COUNTY
MODEL COUNTYWIDE STANDARD
FOR THE
INSTALLATION ROOF COVERINGS
cabrc.881
REV. 7/12/89
TABLE OF CONTENTS
SECTION 101
SECTION 102
SECTION 103
SECTION 104
SECTION 105
SECTION 106
SECTION 107
'~ECTION 108
SECTION 109
SECTION 110
SECTION 111
SECTION 112
SECTION 113
SECTION 114
SECTION 115
SECTION 116
SCOPE
GENERAL
ALTERNATE MATERIALS AND
CONSTRUCTION
ASPHALT/FIBERGLASS SHINGLES
MINERAL FIBER SHINGLES
SLATE SHINGLES
CONCRETE AND CLAY TILES
WOOD SHINGLES AND SHAKES
BUILT UP ROOFS
ALTERNATE METHODS OF
SLATE OR MINERAL SURFACED ROLE ROOFING
METAL ROOFS
SYNTHETIC SHEET MEMBRANE ROOFS
REROOFING/RECOVERING
FLASHINGS
APPROVED LIQUID APPLIED ROOFING MATERIALS SYSTEMS
FOAMED IN PLACE ROOF INSULATION
CODING:
Words ~%~e~en are deletions; words underlined are additions to the
1985 Model Countywide Standard for the Installation of Roof Coverings.
cabrc.881 1 REV. 7/12/89
STANDARD FOR THE INSTALLATION OF ROOF COVERINGS
101 - SCOPE
The requirements set forth in this Standard shall be construed as
minimum requirements and shall apply to the application and
installation of roof covering materials specified herein, excluding
pre-engineered steel buildings. Roof coverings shall be applied in
accordance with this Standard and meet manufacturers published
~ee~e~s instructions.
102 - GENERAL
102.1 - COVERING
102.1.1 - Roof coverings shall provide weather protection for the
building at the roof.
~O2.1.2 - Ail roof coverings shall be applied to a solid or closely
fitted deck, except where the roof covering is specifically designed to
be applied to spaced supports.
102.1.3 - Roofinq systems shall be tested for wind uplift resistance in
accordance with FM 4470, UL 580, or other uplift pressure criteria
acceptable to the BUildinq Official. DeDendinq upon elevation of
installation, the roof system shall have achieved a minimum 1-60 or 1-
90 wind resistance classification.
102.2 - INSULATION
102.2.1 - The use of above deck thermal insulation is permitted on top
of both the roof deck and the roof membrane provided such insulation is
covered with an approved covering applied directly thereto in
accordance with manufacturer's mee~mme~i~s published instructions.
102.2.2 - The base layer shall be a minimum of ~ 3/4-in Class A
insulation shall be installed over metal decking when a roof covering
is installed subject to the insulation manufacturer's flute span table.
The bottom layer of insulation shall be mechanically fastened.
102.3 - FASTENERS
102.3.1 - Nails, clips or similar attaching devices shall be hot dipped
galvanized or equivalent, copper or aluminum, except on built up roofs
where suitable corrosion resistant fasteners may be used.
102.3.2 - Fasteners for wood shingles shall be rust resissant and of
hot dipped zinc coated steel, aluminum or stainless steel and shall be
long enough to penetrate into the sheathing at least 1/2 in.
cabrc.881 2 REV. 7/12/89
102.3.3 - The composition flashing (base flashing) shall be fastened
either with 1 in solid cap-head nails or with nails driven through tin
tags. The nails shall be spaced approximately 8 in on center.
102.3.4 - The' underlayment shall be fastened to the roof sheathing
either with 1 in solid cap-head nails or nails driven through tin tags~
Fasteners shall be installed 12 in on center throughout ~-~-~-~n
ee~e~-~-~e the field and perimeter~
102.4 - REPLACEMENT - Not more than 25% of the roof covering of a
building shall be replaced in any period of 12 months unless the entire
roof covering is made to conform with the requirements of this
Standard, as well as Chapters 7 and 12 of the Standard Building Code,
as amended.
-102.5 - FLASHING, CANTS, NAILERS - Composition base flashing sha]~
extend a minimum of 8 in nominal vertically above the. roof line. Cant
must be provided at any 90 degree angle created by rectangular curbs
projections. Wood nailers shall be provided at the top of all
prefabricated curbs.
102.6 - MECHANICAL UNITS - Mechanical units for new construction shall
be mounted on pipe standards or. curbs beneath which roofing materials
will extend must be mounted to a height sufficiently above the roof to
allow room to install the roof system and to make repairs beneath the
unit (minimum 18 in). Heavy loads, such as large mechanical units,
~e~t~ shall not be rolled over the completed membrane as they may
cause damage to the roof. A failure in horizontal shear between the
membrane, insulation or deck from these loads may result in future
splitting of the roof.
EXCEPTION: 1 & 2 Family Dwellinqs
102.6.1 - Condensation from all coolinq coils or evaporators shall b~
carried full size from drip pan outlet and piped to a s~orm sewer
drain or an approved French drain on units larqer than 3 tons nominal
capacity Drains from units 3 tons and smaller capacity may terminat~
in a qutter or roof drain, or on a concrete pad at ground level or
other location subject to the approval of the Mechanical Official.
103 - ALTERNATE MATERIALS AND ALTERNATE METHODS OF CONSTRUCTION
The provisions of this Standard are not intended to prevent the use of
any material or method of construction not specifically prescribed by
this Standard, provided any such alternate has been approved and its
use authorized by the Building Official. The Building Official shall
approve any such alternate, provided he finds that the proposed deskgn
cabrc.881 3 REV. 7/12/89
is satisfactory and complies with the provisions of Chapter 12 of the
Standard Building Code, and that the material, method of application of
work offered is for the purpose intended and at least the equivalent of
that prescribed in this Standard in quality, strength, effectiveness,
durability and safety. The Building Official shall require sufficient
evidence or proof be submitted to substantiate all claims that may be
made regarding its use. If in the opinion of the Building Official,
the evidence and proof are not sufficient to justify approval, the
applicant may refer the entire matter to the Board of Adjustments and
Appeals.
104 - ASPHALT/FIBERGLASS SHINGLES
104.1 - GENERAL
104.1.1 - Asphalt/fiberglass shingles used as a roof covering shall
comply with the requirements of this section.
~O4.1.2 - Shingle exposure shall be as specified in the manufacturer's
published &pp~e~ instructions.
104.1.3 - Head lap shall be a minimum of 2 in.
104.2 - APPLICATION
104.2.1.1 - 3:12 pitch up to 20:12 pitch: Underlayment shall be one
layer of Type 30 asphalt saturated non-perforated orqanic felt.
104.2.1.2 - Asphalt/fiberglass shingles may be installed on roof
projection of 2:12 pitch to 3:12 pitch providing th-e projection does
not exceed 6 feet and an additional underlay of 1 layer of Type 15
asphalt saturated non-perforated orqanic felt shall be hot mopped over
the Type 30 felt base sheet.
104.2.1.3 - RE-ROOF ONLY - Asphalt/fiberglass shingles may be installed
on roof slopes of 2:12 pitch to 3:12 pitch providing an additional
underlayment of one layer of Type 15 asphalt saturated non-perforated
orqanic felt be hot mopped in asphalt over the Type 30 base sheet or
an additional Type 30 base sheet installed in shinqle fashion.
104.2.2 - Shingles shall be fastened and cemented in valleys, wall and
roof intersections and gable ends. Eaves must be cemented and the
metal eave drip shall be installed over the felt.
104.2.3 - Fasteners shall penetrate through the roofing material and at
least 3/4-in into or throuqh the roof sheathing ~-~h~h-~4~e~-~
104.2.4 - Where steep slopes are involved, special methods of
fastening may be required. Follow manufacturer's ~b~e~ published
instructions.
cabrc.881 4 REV. 7/12/89
105 - MINERAL FIBER SHINGLES
105.1 - For a minimum slope of 3:12 up to 4 1/2:12, underlay shall be a
minimum of one layer Type 30 asphalt saturated non-perforated orqanic
felt nailed and one layer of Type 15 asphalt saturaSed non-perforated
organic felt laid with hot asphalt or cold process cement solid mopped.
105.2 - For slopes of 4 1/2:12 and greater, underlay shall be one
layer of Type 30 asphalt saturated non-perforated orqanic felt.
105.3 - Application shall be in accordance with the
~e manufacturer's published instructions.
106 - SLATE SHINGLES
106.1 - FOr a slope of 3:12, up to 4:12, underlay shall be a minimum
of one layer of Type 30 asphalt saturated non-perforated orqanic felt
fastened and one layer of Type 15 asphalt saturated non-perforated~
orqanic felt laid with hot asphalt or cold process cement solid mopped
in accordance with ~h~-~nm~a~-~f the manufacturer' published
instructions .....
106.2 - For slopes of 4:12 and greater, underlay shall be one layer of
Type 30 asphalt satl]r~tad non-perforated orqanic felt.
106.3 - Maximum exposure shall be as listed in TABLE 106.3 MAXIMUM
EXPOSURE.
TABLE - 106.3
MAXIMUM EXPOSURE
Length of Shingle
Maximum Exposure
24-in
22-in
20-~n
18-~n
16-in
14 -~n
12 -in
10-1n
10 1/2-in
9 1/2-in
8 1/2-in
7 1/2-in
6 1/2-in
5 i/2-in
4 1/2-in
3 1/2-~n
107 - CONCRETE AND CLAY TILE
107.1 - TILES USING CEMENTED APPLICATION (ALL AREAS)
107.1.1 -- Underlay for roof slope of 3'12 and greater shall be a
minimum of one layer of Type 30 asphalt saturated non-perforated
orqanic felt applied with 2 in head lap and 6 in side lap. Then apply
cabrc.881 5
REV. 7/12/89
one layer of mineral surface or slate surface roll roofing, having a
minimum weight of 74 lb/100 sq ft with 4 in head lap and 6 in side lap
to the Type 30 asphalt saturated base felt by mopping hot minimum Type
III asphalt and adhering a mineral surface or slate surface sheet,
backnailing 12 in on center under the 4 in head lap using roofing nails
driven through tin tags or with capped nails. Plastic cement or other
cold applied roof cements may be substituted for asphalt, on roof
slopes greater than 6:12.
107.1.2 - Ail tile applied to roofs having a slope up to and including
6:12 shall be set on an island of mortar. Mortar shall be sandwiched
along sides of all barrel tile. The head lap.off.both shingles and
barrel tile shall not be less than 2 in and- 1 1/2 in on side for barrel
tile. All starter tile shall be nailed. Clay tile set in mortar shall
be sufficiently wetted prior to setting in mortar bed.
107.1.3 - On slopes greater than 6:12 tile shall be spot nailed every
third tile in every fifth row or in other approved manner with not less
hthan 1 1/2 in hot dipped galvanized or equivalent nails. On pitches
qreater than 7:12 all tile shall be mechanically attached.
107.1.4 - Mortar shall be in accordance with ASTM C270-~ 87a, Type M
or Type S.
107.1.5 - e~e%e Roof tile shall comply with physical test
requirements as follows~
1. Portland cement concrete used for roof tile shall be no less
strength than 2,000 psi in 28 days.
~e-~h~-haYe-~-m~m~m-~h~ke~es~-~f-~t-~~n~_~_~_~_~e~
2. Barrel tile shall be test loaded by being supported on sand 2 in
deep in a sand box 4 in wider than the width of the tile. Shingle tile
shall have test~ cloth tubes parallel to the edge of the tile. Sand
tubes shall be 2 in diameter loOsely filled with dry 40/60 silicon and
shall be placed under the edge of tile with a center-to-center distance
equal to the width of the tile. A test load shall be applied on a 3-in
square steel plate bearing on a sand bag set at the center of the tile.
The breaking load of any individual shingle tile shall not be less than
200 lb and the average breaking load of five shingle tiles shall be no~
less than 250 lb and the average breaking load of five barrels shall be
not less than 300 lbs.
4. Absorption: Roof tiles absorb not more than ~8 12% of the dry weight
on the tile during a 24 hour immersion test.
5. Tile shall be subjected to a permeability test where a 2-in head of
water is placed on the top side for 24 hours. Acceptable tiles will
allow no water passage.
107.1.6 - FASTENERS Roof tiles shall be fastened in accordance with
the manufacturer's published instructions and 102.3. Instruc~ion~
shall be available and shall contain but not be limited to:
flashings,
cabrc.881 6
REV. 7/12/89
underla~ment_ sl~.e re uirements ~nd fasteners and their i lacDment
necessa_~_~y_ to co__the requirements of Cha- ter 12 of the Standard
Build~
107.2 - APPROVED ~NeR~E TILES USING MECHANICAL FASTENERS
107.2.1 - F~e~E~yme~_f~_~oeE_~t~pe~_~E_+~)_~_~e~e~_~E&~_~e_o~e
~e-~--~&~l~-~l--~e~lgi~-_~~_~9~__~pe_~__~e,~~__~
m~p~-~a-as~a%~= A mlnzmum sloe of 4:12 ma be used when underla
~lies~ith the followin re- uirement~: a m~n~mum of one la'er of
T--. e 43 coat~ fel~ .or e, uivalent naile~ to the roof d , '
accordance with manufacturer,s ublished in~tructlo~.~'~i~e r~r deck. in
' ' ' ' -~-~-m-~-~ Tile shal ,
with the h--si, cai test re uirements liLle~ '~k'~" ~'~'~- ~-~. ~. ~xce- m~ ror~°mP]~
~overla ~ in- li ~ tile shall h~ve a m~n~mum thickness of no~ less th~
1.2.in for barrel tile and 3 8 in for shin le tile. ~ Tiles shall Pa~
m~n~mum stren th re uirements of 4 000 si in 28 da s.
107.3 - FASTENER~ - Roof tile~ shall be fastened in accord '
~- ~ . . -_
~anufacturer,s ubllshed ~ns ' ~~~r~nce with th~
truc~ons and 102.3. Instructions shall be
availa_~le and shall contain but not be limited to: ~
underla ment sloe re uirements and fasteners_ and_~their~lacement
necessar to com 1 with the re uirements of Cha ter 12 o~ the Standard
Buildin Code.
108- WOOD SHINGLES AND SHAKES
108.1 - SHEATHING - Wood shingles and shakes may be applied to roofs
with solid sheathing~ Spaced sheathing boards shall be not less than 1
x 4, spaced no~ more than 4 in clear between boards for shingles and
for 18 in shakes. Sheathing boards for 24 in shakes shall not be less
than 1 x 6, spaced not more than 4 1/2 in clear between boards.
108.2 - SHINGLES
108.2.1 - Shingles shall be laid with a side lap of not less than 1 1./2
in between joints in courses and joints in alternate courses shall not
be direct alignment. Spacing between shingles shall be approximately
1/4 in. Each wood shingle shall be fastened to the sheathing, with two~
rust resistant nails (~-dRppe~ zinc coa~ed steel in accordance with
~STM 641 class II, aluminum, copper or stainless steel). --
108.2.2 - Weather exposure for wood shingles shall not exceed those
set forth in TABLE-108.1 WEATHER EXPOSURE AND ROOF PITCH. Minimum roof
slope shall be 3:12. Hip and ridge weather exposure shall not exceed
those permitted for the field of the roof.
cabrc.881
REV. 7/12/89
110.1.2 - Mineral surface roll roofing (organic) having a minimum
weight of 74 lbs per 100 sq ft or mineral surfaced roll roofing
(inorganic) having a minimum weight of 63 lbs per 100 sq ft or slate
surfaced roofing shall have a minimum 6 in end lap and 2 in side lap
mopped or cemented. Minimum slope 2:12.
110.1.3~ - The edges of sheathing at eaves and gable ends in all cases
shall be covered and protected with a noncorrosive metal.
110.1.4 - Mineral surfaced roof may be two layers of 46 double
coverage rolled roofing, each layer lapped 19 in and fastened to wood
deck with two rows of fasteners through tin caps spaced not more than
18 in on center through unsurfaced portion of sheet and 6 in on center
at back of each sheet. Mop or cement unsurfaced portion of sheet.
Minimum slope 1:12.
111 - METAL ROOFS
111.1 - MATERIALS
111.1.1 - Copper shall weigh not less than 16 oz per sq ft.
111.1.2 - Galvanized sheet metal shall be 0.0179-in (26 ga) thick or
heavier, .90 oz, q 90 (total weight both sides) zinc coating per sq ft.
111.1.3 - Lead: ~-~ea~r-~-~-~e~-~_~~ soft lead,
ft.
· 2 % lb per sq
111.1.4 - Terne (tin) and TCS (terne coated stainless); terne coating -
40# per double base box, field painted when applicable in accordance
with manufacturer,s published.instructions
111.1.5 - Aluminum, 0.024-in thick.
111.1.6 - Stainless steel minimum 26 qa.
111.2 - FASTENERS - Metal roofs shall be fastened with the
fasteners specified in TABL~ 111.2 FASTENERS FOR METAL ROOFS.
of
cabrc.881
12
REV.
7/12/89
(Underlining deleted for clarity)
TABLE 111.2
FASTENERS FOR METAL ROOFS
TYPE OF ROOF
METAL
FASTENER
Copper
Hard Copper
Copper Alloy
Galvanized Galvanized, (hot dipped)
Aluminum Aluminum
1. Stainless steel fasteners may be used with all s of roof
metal.
111.3 - METAL SHINGLES
111.3.1 - Galvanized shingles, 8 in x i2 in maximum size, minimum
uncoated thickness of 0.0149 in (28 ga).
111.3.2 - Aluminum shingles, minimum thickness 0.019 in, 12 in x 48 in
maximum size. Rosin paper shall be used under metal in addition to
underlay.
111.4 - FLAT SHEET ROOFING - Seams and joints on flat sheet roofing
shall be locked and soldered and made watertight.
111.5 - CORRUGATED SHEETING - Corrugated, Five-V crimp, or other of
industrial roofing, to be securely nailed with lead head or
washered-neoprene nails.
111.6 - SHEETING TO STEEL FRAMING - Metal roofing fastened directly to
steel framing shall be attached by manufacturer's approved fastenings
and shall shed water away from structural members.
111.7 - MINIMUM SLOPE NONSOLDERED SEAMS - Minimum slope for all lapped,
nonsoldered seam metal roofs shall be 3:12.
cabrc.881 13 REV. 7/12./89
deck. Roofing plies shall than be solidly mopped in accordance with
the manufacturer's published instructions ~ee~e~~ for the
installation of roofing over insulation.
109.%~ - ADDITIONAL PLIES - Additional felts, ply sheets or cap sheets
shall be adhered to the base ply or directly to roof insulation with
solid mopping of a bituminous ~mpo~ material applied in accordance
with manufacturer's published instructions ~ee~mme~~. Each
additional ply sheet shall be solidly mopped to preceding ply sheet.
109.5~ - FASTENERS - Nails in nominal 1 in lumber shall not be smaller
than 12 gauge wire nails with heads not less than 3/8 in diameter
driven through tin caps, and not less than 3/4 in long. Roof decks of
cement fiber, poured gypsum, light weight insulating concrete or
similar nailable surfaces require fasteners specifically designed for
use on the Type of deck involved.
109.6~ - SURFACE TREATMENT - Flood coatings, protective/reflective
coatings, aggregates and other surface treatments shall be installed in
accordance with manufacturer's published instructions
Aggregate materials shall be embedded in a ~ flood coat of hot
bitumen (not mopped) and shall not be ussd on roof slopes greater than
3:12. Aggregate shall comply with ASTM D 1863 or locally obtainable
gravel sized according to manufactures specifications. A handful of
aqqre~ate shall no~ drip water. The aqqreqate shall be dry and clean
enouqh to adhere to the hot bitumen flood coat when installed.
109.~ - SLOPES AND MATERIALS
cabrc.881
10
REV. 7/12,/89
109.6.1 - Roof materials shall conform to those materials specified in
TABLE 109.6.1 BUILT UP ROOFS, SCOPES AND MATERIALS.
TABLE 109.6.1 - BUILT UP ROOFS, SCOPES AND MATERIALS
ROOF PITCH
in pr ft
BASE PLIES COATINGS
0-1/4:12
1/8-1/2:12
1/2:12-1 1/2:12
1:12-3:12
2:12-6:12
15 coal tar saturated felt
or
15 asphalt/coal tar
saturated fei t
15 asphalt saturated
fe[t
or
15 asphalt impregnated
glass fiber mat
15 asphalt saturated felt
or
15 ashpalt inpregnated
glass fiber mat
15 asphalt saturated felt
or
15 ashpaLt inpregnated glass
fiber mat
15 asphalt saturated felt
or
15 ashpalt inpregnated glass
fiber mat
coal tar pitch, ASTM
D450
coal tar bi tuman,
ASTM D450 III
dead Level ashpalt,
ASTM D312 !
f !at asphalt ASTM
D132 II!
flat asphalt ASTM
D132
flat asphalt ASTM
D132 Iii
110 - SLATE OR MINERAL SURFACED ROLL ROOFING
110.1 - MATERIAL AND INSULATION
110.1.1 - Underlayment shall be one
having a minimum diameter of 1 5/8 in.
30 felt
fastened by tin caps
cabrc.881 11 REV.
7/12/89
TABLE 108.1
WEATHER EXPOSURE AND ROOF PITCH
ROOFING LENGTH GRADE
MATERIAL (IN)
EXPOSURE (IN)
3:12 PITCH
(MINIMUM)
TO < 4:12
4:12 PITCH
(MINIMUM)
& STEEPER
16
SHINGLES 18
24
SHAKES 18
NO. 1 3 3/4 5
NO. 2 3 1/2 4
NO. 3 3 3 1/2
NO. 1 4 1/4 5 1/2
NO. 2 4 4 1/2
NO. 3 3 1/2 4
NO. 1 5 3/4 7 1/2
NO. 2 5 1,/2 6 1/2
NO. 3 5 5 1/2
NOT 8
24
PERMITTED 10
108 - SHAKES
108.3.1 - Shakes shall be laid with a side lap of not less than 1 1/2
in between joints in adjacent courses. Spacing between shakes shall be
approximately 1/2 in. Each wood shake shall be fastened to the
sheathing with two rust resistann nails (hot dipped zinc coated steel,
aluminum, copper or stainless steel). The starter course at the eaves
shall be doubled and the bottom or first layer may be either 15 in or
18 in wood shakes or wood shingles. 15 in or 18 in shakes may be used
for the final course at the ridge.
108.3.2 - Shakes shall be laid with 18-in wide strips of minimum Type
~$ .30 asphalt saturated non-perforated orqanic felt shingled between
each course in such manner that no felt is exposed to the weather.
108.3.3 - Weather exposure shall not exceed those set forth in
TABLE-108.1 MAXIMUM EXPOSURE. Hip and ridge weather exposure shall not
exceed those permitted for the field of the roof.
108.4 - FIRE RETARDANT SHINGLES AND SHAKES
108 4.1 ' --
- - - ~re ~~-~-re~t~ec~_~_~ii~3~_~_~s__~__~f
e~e~~--~im~e~-~--1-5/-~-if~-m~m~-~ywo~d_~e~k~_~n~n~l__~_~
1. Class B fire retardant treated wood shakes with an asphal~ fel[
interlayment consistinq of 18-inch wide strips of Type 30 satur,~ted
cabrc. 881
8 REV. 7/12/89
non-perforated orqanic felt over
particleboard or 15/32-inch plywood.
7/16-inch minimum Type
2 -M-W
108.4.5 ~ - Fire retardant treated wood shingles and shakes as Class C
prepared roof coverings. Shakes are to be provided with an
interlayment of one layer of 18-in wide by minimum Type ~ 30 asphalt
saturated non-perforated organic felt between shake courses.
109 - BUILT UP' ROOFS
-t09.1 - SPECIFICATIONS - Specifications of any manufacturer who
systems are bondable or guaranteed, whether or not such bond
guarantee is to be issued, shall be deemed to meet the requirements .... ~
this Standard, provided they do not conflict with the requirements of
the fire district limits.
109.~1 - SURFACE PREPARATION
109.Z~.1 - Before starting the application of any roofing membrane, all
roof decks shall be uniform and broom cleaned~ &~ Parapet walls,
vertical walls, penthouses and similar structures above the roof level
shall have been completed, and all flat roof decks shall have been
provided with a cant strip where the roof deck joins a vertical
surface. Cant strips shall extend at least 3 1/2 in up all the
vertical surfaces. Wood roof decks shall be solidly sheathed.
Structural concrete decks shall be smooth, dry and free from laitance.
Lightweight insulating concrete~ cellular foam roof decks shall be ~r~
cured and at least 72 hours of precipitation-free weather is required
prior to roof application. Subsequent to that time, if precipitation
occurs, an additional 24 hours drying time is required.
109.Z~.2 - Gypsum roof decks shall be surface dry before starting
application of roofing. In no case should the application be started
less than 24 hours after the gypsum pouring.
109.Z!.3 - Ail eave fascia shall be completed by completion of fin~
roofing.
109.~ - BASE PLY - Unless otherwise specified herein, a base ply shall
be secured by mechanical fastening to any nailable deckJ Where one or
more layers of material are installed as the base ply, they. shall be
laid dry, not cemented and attached to the nailable deck with
fasteners. On pre-cast, non-nailable decks a minimum of 1/2 in
fiberboard insulation shall be solidly mopped to a primed concrete roof
cabrc. 881 9 REV. 7/12/89
112 - SYNTHETIC SHEET MEMBRANE ROOFS
112.1 - GENERAL
112.1.1 - For the purpose of this Standard, synthetic sheet membrane
roofs (hereafter referred to as "membrane") include elastomeric and
plasteromeric preformed sheet materials and modified bituminous sheet
materials, both reinforced and non-reinforced, which are typically, but
not necessarily, installed in single layers.
112.1.2 - The structural roof system to which the membrane is to be
applied may be required to be certified by a registered engineer as
being capable of sustaining the construction, membrane, ballast and
ancillary material loads that will be encountered during'and subsequent
t ·
o membrane application,. Preservative treated wood nailers shall be
installed at ~he perimeter of ~he roof, around all roof vents,
skylights and similar penetrations, and all membrane terminations
unless ,
1. the roof membrane is to be attached directly to the structural deck,
2. the roof membrane is to be attached through the substrate and into
the structural deck,
3. the substrate at these locations is capable of accepting mechanical
fasteners and is fas~ned to the structural deck in a manner to obtain
sufficient strength to resist the forces of wind uplift.
The thickness of the nailer shall be such that the top of the nailer is
flush with the surface to which the membrane is to be installed.
112.2 - MATERIALS
112.2.1 - There shall be no co-mingling of different s of materials
except through proper adapters. In all cases, approved methods and
sealers designed for the particular elasto/plastic materials shall be
used. ~
112.2.2 - An elastomer, as defined by the Roofing Industry Educational
Institute glossary, is a substance that can be stretched at room
temperature to at least twice its original length, and after having
been stretched and the stress removed, will re
approximately its original length in a short time~urn without force to
112.2.3 - A plastic, as defined by ASTM D 883, is a material that
contains as an essential ingredient one or more organic polymeric
substance of large molecular weight, is solid in its finished state and
at ~ome stage in its manufacture or processing into finished articles
can be shaped by flow. ,
112 2.4 - Membrane, material shall be a minimum 0.040-in thick.
cabrc.881
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REV. 7/12/89
112.2.5 - Flashing, Elasto/Plastic material, cured or uncured, shall be
minimum 0.040-in thick. Composite flashings shall be minimum 0.030-in
thick.
112.3 - APPLICATION - The membrane shall be applied by one or a ~
combination of the following methods:
112 . 3 . 1 - ADHERED METHOD
112.3.1.1 - SUBSTRATE - The substrate to which the membrane is to be
applied shall be clean, dry and free from debris or contaminants that
will interfere with the adhesion or attachment of the membrane or that
will puncture the membrane. Joints or gaps in the substrate greater
than 1/4 in shall be filled. Substrate materials shall be compatible
with or shall be isolated from cleaning agents, solvents, adhesive or
heat used to adhere the membrane or fabricate lap joints.
112.3.1.2 - MEMBRANE - The membrane shall be free from defects. LaD_~
-~oints shall be fabricated in accordance with manufacturer's publish~
instructions
112.3.1.3 - ADHESIVES - Adhesives shall be applied in accordance with
manufacturer's published instructions
weather limitations prescribed by the manufacturer.
112.3.1.4 - MECHANICAL FASTENING -
The membrane and the perimeter flashinq system shall be mechanical]~
fastened at the perimeter of the roof, around all roof vent, skyliqht
and similar penetrations, at all membrane terminations, and as required
within the field of the roof by the manufacturer.
112.3.1.5 - FLASHING - Flashing materials shall be compatible with the
base membrane materials and substrates to which they are applied.
112.3.6 - PROTECTIVE COATINGS- Protective coatings shall be applied in
accordance with manufacturer's published instructions
112.3.2 PARTIALLY ADHERED & MECHANICALLY FASTENED METHODS
112.3.2.1 - SUBSTRATE - The substrate to which the membrane is ~o be~
applied shall be clean, dry and free from debris or contaminants that
will interfere with the adhesion or attachment of the membrane or tha~
will puncture the membrane. If insulation is to be used as the
substrate, the insulation shall be adhered or mechanically attached to
the structural deck. Substrate materials shall be compatible with or
shall be isolated from cleaning agents, solvents, adhesives or heat
used to adhere the membrane or fabricate lap joints.
cabrc.881 15 REV. 7/12/89
112.3.2.2 -- MEMBRANE - The membrane shall be free from defects. Lap
joints shall be fabricated in accordance with manufacturer,s published
instructions
112.3.2.3 - ADHESIVES - Adhesives shall be applied in accordance with
manufacturer's, published instructions Pe~eme~Hs, and within the
weather limitations prescribed by the manufacturer.
112.3.2.4 - MECHANICAL FASTENING - The membrane and the perimeter
flashing system shall be mechanically fastened at the perimeter of the
roof, around all roof vent, skylight and similar penetrations, at all
membrane terminations, and as required within the field of the roof by
the manufacturer.
112.3.2.5 - FLASHING - Flashing materials shall be compatible with the
base membrane materials and substrate to which they are applied.
112.3.2.6 - PROTECTIVE COATINGS - Protective coatings shall be applied
in accordance with manufacturer,s published instructions
112.3.2.7 - BALLAST - Ballast shall conform to and be applied in
accordance with manufacturer,s published instructions
Systems requiring ballast shall not be used on roof slopes greater than
1:12.
112.3.3 - LOOSE LAID/BALLASTED METHOD
112.3.3.1 - SUBSTRATE - The substrate to which the membrane is to
applied shall be clean, dry and free form debris or contaminants that
will puncture the membrane. Substrate materials shall be compatible
with or shall be isolated from cleaning agents, solvents, adhesives or
heat used to adhere the membrane or fabricate lap joints.
112.3.3.2 - MEMBRANE - The membrane shall be free from defects. Lap
joints shall be fabricated in accordance with manufacturer,s published
instructions
112.3.3.3 - ADHESIVES - Adhesives shall be applied in accordance with
manufacturer,'s published instructions ~e~eme~%s and within the
weather limitations prescribed by the manufacturer.
.... ~ ~ ~7~a~a-~-- ~L~t~ --~
The membrane and the perimeter flashinq system shall be mec]~
fastened at the perimeter of the roof~ around all roof vents~
~ts and similar enetrations, at all membrane terminations an~
as re,red within the field o~ the roof ~the manufacturer.
cabrc.881
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REV. 7/12/89
112.3.3.5 - FLASHING - Flashing materials shall be compatible with the
base membrane materials and substrates to which they are applied.
112.3.3.6 - PROTECTIVE COATINGS - ~rotective coatings shall be applied
in accordance with manufacturer's published instructions
112.3.3.7 - BALLAST - Ballast shall conform to and be applied in
accordance with manufacturer's published instructions
Systems requiring ballast shall not be used on roof slopes greater than
1:12.
112.3.3.8 - INVERTED SYSTEMS -
Refer to Section 102.2.1 for
insulation requirements.
112.4 - PRECAUTIONS - The manufacturer's published instructions
~%~&~ and details shall be strictly adhered to and a copy of
the instructions shall be available at all times on the job site during
installation.
113 - REROOFING/RECOVERING
The requirements of this section shall govern reroofing/recovering.
113.1 - DEFINITIONS:
113.1.1 - For the purposes of this section, the following definitions
shall apply:
1. REROOFING: The practice of removing the existing roofing membrane,
repairing any damaged substrate, and installing a new roofing system.
2. RECOVERING: The practice of preparing the old roof surface (as
opposed to the removal of the existing roof) and installing a new roof
system.
113.1.2 - The structural roof components to which the roofing system is
to be applied shall be capable of supporting the roof system, ancillary
material, and equipment loads that will be encountered in any
reroofing/recovering operation. Any structurally damaqed roof
components, e.q., roof deck, sheathinq, rafters, joists shall be
repaired in such a manner which maintains the structural inteqrity of
the component and roofinq system.
113.2 - INSTALLATION - Reroofing rather than recovering shall be
utilized in the following cases:
t. When ~1~ existing roofing or insulation is water soaked or
deteriorated to the point that it is not suitable as a roof base?--
for additional roofing.
2. When blisters exist in any roofing, unless blisters are cut or~ ~
scraped open and nailed down before applying additional roofing.
3. When the existing roof surface is gravel or the like, unless
gravel shall be thoroughly removed or all loose gravel removed and
an approved base material installed before applying additional
roofing.
4. When existing roof is rigid tile or rigid shingle.
cabrc.881 17 REV. 7/12/89
5. When sheathing or supports are deteriorated to the point that the
roof structural system is not sUbstantial enough to support
recovering.
6. When existing roof has two or more applications of any roofing
material.
7. Wood shingles shall not be placed over more than one application
of asphalt shingles. Wood shingles or shakes shall not be applied
over existing wood shakes or shingles.
8. All reroofing is to be applied in accordance with new roofing
specifications.
EXCEPTIONS:
1. When the structural deck is concrete and the existing roof is
firmly attached to the deck, than the roof shall be removed down
to a minimum of three plies of moisture free felts.
2. When otherwise approved by the Building Official.
114 - FLASHINGS
114.1 - GENERAL
114.1.1 - Flashings shall meet the requirements of this section, except
as otherwise specified in this standard.
114.1.2 - Ail metal flashing installed east of Federal Highway U.S.
shall be a minimum of 16 ounce copper or 26 gauge stainless steel.
114.1.3 - Intersection of Flat, Low slope and Pitched Roof. Whenever
flat and pitched roofs meet or intersect, a flashing not less than 12
in wide is required. See TABLE-ii3.3.2 VALLEY AND FLASHING MATERIALS.
114.1.4 - Wall to roof intersection flashing shall extend 5 in up tho
wall and a minimum 4 in onto the roof.
114.2 - RIGID SHINGLE ROOF COVERINGS
114.2.1 - Flash with metal and coun~erflash with metal or non-me~allie
material.
114~2.2 - Ail flashingr-exee~k_~_e~geT_sha~_~e_~_~ri~u~r~z~_l~r_~'
wi~e-a~ shall be a minimum of 16 ounce copper or 26 gauge stainless
steel.
EXCEPTION: Drip edge or break metal (where change in slop~
occurs) may be any metal permitted in TABLE 114.3 2 VALLEY AND
FLASHING MATERIALS. '
114.2.3 - Chimneys, stucco, brick or walls tha~ would be damaged by
cutting to install metal counter e~p flashing may have
flashing installed as approved by the Building Official.
cabrc.881 18 REV. 7/12/89
114.3 - ASPHALT/FIBERGLASS SHINGLE ROOF COVERING
114.3.1 - FLASHINGS - base and cap flashings shall be installed in
accordance with manufacturer's published instructions. Base cap .~
flashings shall be corrosion resistant metal of minimum thickness in
accordance with TABLE-ii4.3.2 VALLEY AND FLASHING MATERIALS.
114.3.2 - Ail valley flashing shall be at least 16 in. wide and of any
of the corrosion resistant material listed in TABLE-ii4.3.2 VALLEY AND
FLASHING MATERIALS.
TABLE - 114.3.2
VALLEY AND FLASHING MATERIAL
MINIMUM
MATERIAL THICKNESS GAGE WEIGHT
COPPER - - 16 OZ.
ALUMINUM 0.025 IN - -
STAINLESS STEEL - 26 -
GALVANIZED STEEL (G90) - 26 -
ZINC ALLOY 0.027 IN - -
LEAD - - 3 POUNDS
PAINTED TERNE - - 20 POUNDS
NOTE: Ail metal flashing installed east of Federal Highway U.S. #1
shall be a minimum of 16 ounce copper or 26 gauge stainless steel.
114.4 - WOOD SHINGLES AND SHAKES
114.4.1 - Roof valley flashing shall be provided of not less than 16
ounce copper or 26 gauge stainless steel and shall extend at least ~
in from the centerline each way. Flashing shall be "W" shape with a
3/4 in high center crimp and shall have an end lap of not less than
in. The metal shall be fastened with clips spaced at 24 in on center.
114.4.2 - Wall to roof intersection flashing shall
~-R6-~e-~t~i~~-~ee~-a~-~°nz~t~ extend a minimum + ~ in up the
wall and a minimum 5 4 in onto the roof.
114.5 - BUILT UP ROOFS
114.5.1 - Base flash with a bituminous built-up flashing material o]
cant strips and cap flash with metal or other approved methods.
114.5.2 - Corrosion-resistant metal shall be used for cap or
counterflashing. See TABLE-iI4.3.2. VALLEY AND FLASHING MATERIAL.
114.5.3 - When a bituminous base flashing is used, a minimum of two
plies of 15 asphalt saturated non-perforated orqanic felt or glass
fiber ply sheets ~m-~be~ felts shall be installed with steep
cabrc.881 19 REV. 7/12/89
asphalt or plastic cement for a Class C roof, top nailed and top coated
with steep asphalt or plastic cement.
114.5.4 - A bituminous base flashing for Class A or B roof shall be a
minimum of three plies of 15 asphalt saturated non-perforated orqanic
felt or glass fiber ply sheets or asbestos felt. Each ply shall be set
in a solid mopping of steep asphalt or in a continuous bed of plastic
cement. The flashing assembly shall be coated with steep asphalt,
plastic cement, or emulsified asphalt or the flashing shall comply with
the recommendations of the roofing manufacturer for a base flashing.
114.6 - GRAVEL STOP
114.6.1 - Gravel stop shall have a minimum 3,/4 in rise above the roof
flange, out onto roof a minimum of 3 in, fastened a minimum of 6 in on
center.
114.6.2 - Overlap shall be a minimum of 4 in. Another method of joint
construction as approved by the Building Official may be used.
114.6.3 - Ail joints shall be sealed with plastic cement.
114.6.4 - Gravel stop shall be installed on top of all mopped felts in
a layer of plastic cemenn and then stripped w~th two layers of felt,
each embedded in a mopping of hot asphalt with the first strip of a
minimum of + ~ in wide and the top strip a minimum of ~ 9 in wide or in
accordance with manufacturer's published instructions. -
114.6.6 ~ - An approved nailer is required for gravel stop and metal
flashing flanges.
114.6.~ ~ - Gravel stop shall comply with the minimum values listed in
TABLE-114.6.~ ~ GRAVEL STOPS-DIMENSIONS AND MATERIAL.
TABLE - 114.6.~ 6
GRAVEL STOPS-DIMENSIONS AN~MATERIAL
HEIGHT OF GALVANIZED
GRAVEL STOP STEEL(GAGE)
(G90)
COPPER ALUMINUM
(OZ) (INCHES)
ZINC STAINLESS
ALLOY STEEL(GAGE)
(IN)
4 26
5 24
6 22
7 22
8 2O
16 0.025
16 0.032
20 0.040
20 0.040
20 0.050
0.020 26
0.027 26
0.027 24
22
20
cabrc.881
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REV. 7/12/89
114.7 - DRIP EDGE FOR EAVES AND GABLES
114.7.1 - Provide a drip edge at eaves and gables of all roofs applied
over the underlayment. Overlap to be a minimum of 2 in.
114.7.2 - Eave drip shall extend 1/4 in below sheathing and extend back
on the roof a minimum of 1 1/2 in. This applies to both new and old
roofs.
114.7.3 - EXCEPTION: This section does not apply to wood shingles or
shakes.
114.7.4 - See TABLE-ii4.3.2. VALLEY AND FLASHING MATERIALS.
114.8 - CHIMNEYS - Cricket or saddle coverings shall be metal and
structurally supported. See TABLE-Ii4.3.2. VALLEY AND FLASHING
MATERIALS.
114.9 - PARAPET WATJ~ - On parapet walls that require waterproofing
within the fire district limits, if a bituminous flashing is used, the
top layer shall be one layer of 15 ~e~%~ fiberqlass felt in soli~
layer of plastic cement.
ll4.10-OPENINGS IN ROOF
114.10.1 - Ail plumbing~ ~ electrical and ventilation penetrations
~e~ shall be flashed with
~~ee%--~t--me~a~--~a~i~g~. the same material as used in the
roofinq application.
114.10.2 - In any reroofing application, all base flashings on
protrusions extending through the plane of the roof shall be removed
and replaced with corrosion resistant metal flashings. See
TABLE-ii4.3.2 VALLEY AND FLASHING MATERIAL.
114.10.3 - Metal flashing flanges to be set, nailed and stripped in
accordance with gravel stop applications specifications and
manufacturer's published instructions.
114.11 - METAL PANS
114.11.1 - Fabricated metal pans for sealinq roof penetrations shall b~
minimum 2 1/2 in deep and constructed of a minimum 26 qa stainless
steel, 0.040 in aluminum, 0.027 zinc alloy or 16 ounce copper, 26 qa
galvanized G90 or the manufacturer's recommended product.
114.11.2 - Provide a minimum 2 in clearance between the edqes of th~
metal pan and penetratinq components.
114.11.3 - Securely fasten metal pans to substrates usinq suitabl~
compatible non-corrosive fastener or manufacturer's published
instructions.
cabrc. 881 21 REV. 7/12/89
114.11.4 - The' deck flanqe shall be stripped in with one stripDinq ply
in hot or mastic and one or more additional plies in hot or mastic or
flashinq ply in hot or mastic. The strippinq ply and successiw~
ply(ies) or flashinq shall cover the flanqe and extend on the roof
minimum of 6 in in accordance with manufacturer,s published
instructions.
114.11.5 - The pan shall be filled with hot III or other material
(e.q. dead level, Type II asphalt, self levelinq elastomeric sealer) as
recommended by the roofinq manufacturer. If hot asphaltic material
used to fill the pan, the fillinq shall be accomplished in two
lifts_L the $irst lift fillin a roximatel to mid oint the second
and f_inal lift will be_acc~lished after the first lift has chille~
and will fill the -.an~ A final to in- of roofers m~stic or
e]astomeric sealer may be applied to assure drainaqe of the pan.
115 - APPROVED LIQUID APPLIED ROOFING MA~BR}A~S SYSTEMS
~115.1 - GENERAL - The use of liquid applied roofing m~e~s systems
shall be in accordance with the manufacturer,s published instructions
~ee~m~e~e%~~. The moisture barrier shall be a single or multiple
component system consisting of the number of applications as
recommended by the manufacturer. The dry mil thickness of the
systems shall be in compliance with the manufacturer,s published
instructions ~ee~e~. In any event the minimum dry thickness
shall be 15 mils. '
115.2 - PREPARATION OF SURFACE - Before starting the application, to
assure adherence, the substrate must be clean, dry and free from dust,
dirt, incompatible chemicals, grease, oil, wax and laitance. A primer
may be recommended by the manufacturer.
115.3 - APPLICATION - The applicator shall be familiar with the system
and application equipment either through previous experience, training
or assistance provided by the manufacturer,s representative during
application. The system should be applied uniformly at recommended
thickness by the manufacturer. Weather conditions should be favorable
and both the air and substrate as recommended by the manufacturer.
All roofing substrate m~e~s systems shall be solidly attached. All
surface openings and flashing details are to be corrected prior to
application of the liquid coating. If movement is anticipated in the
deck, bond breakers or reinforcing embedded fabric should be considered
at the roof joints according to manufacturer,s published inStructions.
115.4 - ROOF SLOPE - The minimum recommended roof slope is 1/4:12 (2%).
Roofs which pond water are not acceptable. '
115.5 - PRECAUTIONS - The manufacturer,s published instructions
~bb~%b~s and details shall be strictly adhered to and a copy of
the instructions shall be available at all times on the job site during
installation.
cabrc. 881
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REV. 7/12/89
116 - FOAMED IN PLACE ROOF INSULATION
116.1 - GENERAL
116.1.1 -- Foamed in place roof insulation, when used in conjunction
with a waterproof and protective surface coating shall be applied full
thickness in one layer in accordance with the manufacturer's published
instructions ~e¢~mme~a~ . Quality of the foam surface shall be
esSentially Uniformily smooth, free of voids, crevices and pinholes,
Protective surf:acing m~eP~m systems shall be applie.d no less than 2
hours nor more than 72 hours following the application of the foam.
116.1.2 - When liquid applied surfacing is used, requirements of
Section 115 apply. When elastomeric or plastomeric protection is used,
requirements of Section 112 apply.
cabrc.881 23 REV. 7,/12/89