O86-56ORDINANCE NO. 86-~
AN ORDINANCE OF THE CITY OF BOYNTON
BEACH, FLORIDA, AMENDING CHAPTER 5,
BUILDING CODE, BY ESTABLISHING A NEW
SECTION 5-6, STANDARD FOR THE
INSTALLATION OF ROOF COVERINGS CODE BY
ADOPTING THE PALM BEACH COUNTYWIDE
STANDARD FOR THE INSTALLATION OF ROOF
COVERINGS REVIEWED AND RECOMMENDED BY
THE BUILDING CODE ADVISORY BOARD OF
PALM BEACH COUNTY AND BUILDING
OFFICIALS ASSOCIATION OF PALM BEACH
COUNTY; PROVIDING FOR A SAVINGS
CLAUSE; REPEALING PROVISIONS;
AUTHORITY TO CODIFY; AND 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 AND IT IS HEREBY ORDAINED BY THE
CITY COUNCIL OF THE CITY OF BOYNTON BEACH, FLORIDA, AS
FOLLOWS:
Section 1._ That Chapter 5 of the Codified
Ordinances of the City of Boynton Beach, Florida, be amended
to establish a new Section 5-6, "STANDARD FOR THE
INSTALLATION OF ROOF COVERINGS".
Sectioq ~ That the addendum listed as Appendix A
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in conflict herewith are hereby repealed.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 ~ourt
of competent jurisdiction to be invalid, such decision shall
not affect the remainder of this ordinance.
Section 5.
this Ordinance.
Section 6.
immediately upon its passage.
First reading this /~ day of
1986.
of
Authority is hereby granted to codify
This Ordinance shall become effective
Second, final reading and passage, this ~ day
.~G~ F4~' , 1986.
CITY OF BOYNTON BEACH, FLORIDA
Vice M~~
Council _M~be~
~ou~ Member
ATTEST
- ff ' C' t7 Clerk
(Corporate Seal)
A P PEND IX
PALM BEACH COUNTYWIDE
STANDARD .FOR THE INSTALLATION OF ROOF COVERINSS
REVIEWED AND RECOMMENDED BY THE
BUILDIN8 CODE ADVISORY BOARD OF
PALM BEACH COUNTY
AND
BUILDIN8 OFFICIALS ASSOCIATION OF
PALM BEACH COUNTY
BUILDING OFFICIALS ASSOCIATION OF
PALM BEACH COUNTY
1985 CODE AMENDMENT COMMITTEE
ROBERT W. PALCHANIS, Chair, Building Official Palm Beach County
HOWARD COOK, Chair, Palm Beach County Code Advisory Board
EDGAR "BUD" HOWELL, Building Official, City of Boynton Beach
JOHN KNIPPEL, President, Home Builders & Contractors Association
ANDREW-MISH, DeputyBuilding Official Palm Beach County
ROBERT MOORE, Building Official, Town of Palm Beach
CHARLES O'MEILIA~ P.E.~ Building Official, Village of North Palm Beach
EDWARD WINCH, Building Official, City of Sreenacres
KEITH WHITMER~ Building Official City of West Palm Beach
DOMINIC SIMS, Research Specialist Palm Beach County
ROO~IN8 RUB-COMMITTEE
CHARLES O'MELLIA, P.£., Building official, Village of North Palm Beach
RALPH KEMP, President~ Cirpenter Roofing Co.
JOHN KNIPPEL~ President, Home Builders & Contractors Association
LEG KNOP~ Pr.esident, Standard Roofing Co.
DOMINIC SIMS, Research Specialist Palm Beach County
fSi. COY
PREFACE
The criteria contained herein are the minimum necessary to assure
the proper installation of roof covering materials and systems on
both new and existing buildings. The requirements have been
presented in performance language wherever possible. This
approach will encourage the development and implementation of new
and innovative roof covering systems and methods of application.
The manufacturer's instructions and specifications shall, as
noted throughout the standard, be followed when applicable.
The intent of this standard is to speak of roof coverings only
and not the type or integrity of decking or sheathing applied to
the building. Such requirements are contained within the
Standard Building Code. It should also be noted that this
standard does not deal with the fire ratings nor the minimum
design loads of roof covering materials. These requirements,
which must also be considered, are covered by the Standard
Building Code.
rsl.86ds 16
REV. 9/~5/86
STANDARD FOR THE INSTALLATION OF ROOF COVERINSS
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 specifications.
102-SENERAL
I02.1-COVERIN8
102.1.1 Roof coverings shall provide weather protection for the
building at the roof. '
102.1.2 All 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.
102.2-INSULATION
102.~.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 recommendations.
102.2.2 A minimum of 1/2-in insulation shall be installed over
metal decking when a roof covering is installed subject to the
insulation manufacturer's fiute span table. The bottom layer of
insulation shall be mechanically fastened.
102.3-FASTENER8
102.~.1 Nails, clips or*similar attaching devices shall be hot
dipped gaivanized~ 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 resistant 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.
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 I in solid cap-head nails or nails driven through tin
tags 12 in on center throughout and 6-in on center on the
perimeter of each underlayment sheet.
EXCEPTION: The fastening of underlayments for
asphalt/fiberglass shingles shall be as per manufacturers
specifications; sufficient to hold the underlayment in place.
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.
rsl.8Gds
1 REV. 9/25/86
I02.5-FLASHING, CANTS, NAILERS
Composition base flashing shall extend a minimum of 8 in nominal
above the roof line. Cants must be provided at any 90 degree
angle created by rectangular curbs or projections. Wood nailers
shall be provided at the top of all prefabricated curbs.
EXCEPTION! this does not apply to metal base flashing or were
manufactures specifications conflict.
102.6-MECHANICAL UNIT8
Mechanical units mounted on pipe standards 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. Heavy loads, such as large
mechanical units, should 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.
103-ALTERNATE MATERIAL8 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 design 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 ail
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-AGPHALT/FIBER GLAS~ SHINGLES
104.1-GENERAL
104.1.1 Asphalt/fiberglass shingles used as a roof covering shall
comply with the requirements of this section.
104.1.2 Shingle exposure shall be as specified in the
manufacturer's application 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
one layer of type 30 asphalt saturated non-perforated felt.
be
104.2.1.2 Asphalt/fiberglass shingles may be installed on roof
projection ~f 2:12 pitch to 3:12 pitch providing the projection
does not exceed 6 feet and an additional underlay of 1 layer of
type 15 asphalt felt shall be hot mopped over the typed 30 felt
base sheet.
104.~1.~ Re-roof Only Asphalt/fiberglass shingles may be
installed on roof slopes of 2:12 pitch to 3:12 pitch providing on
additional underlayment of one layer of type 15 asphalt felt be
hot mopped in asphalt over the type 30 base sheet.
rsl.86ds 2
REV. 9/25/86
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 ~enetrate through the roofing material
and at least 3/4-in into the roof sheathing or through the roof
sheathing.
104.2.4 Where steep slopes are involved~ special methods of
fastening may be required. Fol low mar, ufact urer' s printed
instruct ions.
105-ASBESTOS 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 felt nailed
and one layer of type 15 asphalt saturated felt laid with hot
asphalt or cold process cement solid mopped.
105.2 For slopes of 4 1/2:12 and greater~
layer of type 30 asphalt saturated felt.
underlay shall be one
105.~ Application shall be in
recommendations of the manufacturer.
accordance with the
10G-SLATE SHINGLES
I0~.1 For a slope of ~:12, up to 4:12, underlay shall be a
~inimum of one layer of type 30 asphalt saturated felt fastened
and one layer of type 15 asphalt saturated felt laid with hot
asphalt or cold process cement solid mopped in accordance with
the recommendation of the manufacturer.
106.2 For slopes of 4:12 and great,er,
layer of type 30 asphalt saturated felt.
underlay shall
be one
10~.3 Maximum exposure shall be as listed in TABLE 106.3 MAXIMUM
EXPOSURE.
TABLE-!06.3
MAXIMUM EXPOSURE
Length of Shingle Maximum Exposure
24-in
22-in
20-i~
18-in
16-in
14-in
12-in
lO-in
10 1/2-in
9 I/2-1n
8 1/2-in
? 1/2-in
6 I/2-in
5 1/2-in
4 1/2-in
3 1/2-in
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 typed 30 asphalt saturated felt applied
with 2 in head lap and 6 in side lap. Then apply One layer of
mineral surface or slate surface roll roofing, having a minimum
weight of 74 lb/lO0 sq ft with 4 in head lap and 6 in side lap to
rsl.86ds 3
REV. 9/25/86
the type 30 asphalt saturated base felt by mopping hot 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 All 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 ~11 barrel tile. The head lap of
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. Olay tile set in mortar Shall be sufficiently wetted
prior to setting inmortar bed.
107.1.3 On slopes greater than 6:12 tile shall be spot
every third tile in every fifth row or in other approved
with not less than I 1/2 in hot dipped galvanized nails.
107.1.4 Mortar shall be in accordance with ASTM 0270-73.
nailed
manner
107. I.~ Concrete 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. Except for an overlapping
lip, tile shall have a minimum thickness of not less than 1/2
in for barrel tile, and 3/8 in for shingle tile.
2. Barrel tile shall be test loaded by being supported on sand
2 in deep in a san 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 not less than 250 lb and the average breaking load of
five barrels shall be not less than 300 lbs.
3. Tiles shall pass minimum strength requirements of 4,000 psi
in 28 days.
4. Absorption: Roof tiles absorb not more than i0% 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.
107.2-APPROVED CONCRETE TILES USING MECHANICAL FASTENER8
107.2.1 Underiayment for roof slopes of 4:12 and greater
be one type 30 nailed and one ply asphalt coated type 43
sheet, hot mopped in asphalt.
shall
base
107.~.2 Tiles shall be faster~ed
manufacturer's instructions.
in accordance with the
I07.2.3 Tile shall comply with the greater of the physical
requirements*listed in 106.1.5.2 and 106.1.5.3.
test
lOS-WOOD SHINGLES AND SHAKES
108.1-SHEATHING
Wood shingles and shakes shall be applied to roofs with solid
sheathing or spaced sheathing boards. Spaced sheathing boards
shall be not less than 1 x 4, spaced not 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
~ore than 4 1/2 in clear between boards.
rsl. 86ds 4
REV. 9/25/86
108.2-SHINGLES
108.2.1 Shingles shall be laid with a side lap of not less than
1 1/.0 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 (hot
dipped zinc coated, steel aluminum, copper or stainless steel).
108.~..0 Weather exposure for wood shingles shall not exceed
those set forth in TABLE-lO8.1 WEATHER EXPOSURE AND ROOF PITCH.
Minimum roof slope shall be 3:1.0. Hip and ridge weather exposure
shall not exceed those permitted for the field of the roof.
TABLE 108.1
WEATHER EXPOSURE AND ROOF PITCH
ROOFIN8 LENSTH GRADE
MATERIAL <IN)
EXPOSURE (IN)
5:1.0 PITCH
(MINIMUM)
TO < 4~12
4:1.0 PITCH
<MINIMUM)
& STEEPER
16
SHINGLES 18
.04
NO. 1 3 3/4 5
NO. .0 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. .0 5 1/2 6 1/2
NO. 3 5 5 1/2
SHAKES 18 NOT 8
2~ PERMITTED 10
lOS-SHAKES
108.5.1 Shakes shall be laid with a side lap of not less than 1
1/2 in between joints in adjacent courseR. Spacing between
shakes shall be approximately 1/2 in. Each wood shake shall be
fastened to the sheathing with two rust resistant 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.
108.5..0 Shakes shall be laid with 18-in wide strips of minimum
type 15 asphalt saturated felt shingled between each course in
such manner that no felt is exposed to the weather.
108.~.~ Weather exposure shall not exceed those set forth in
TABLE-lO8.1 MAXIMUM EXPOSURE. Hip and ridge weather exposure
shall not exceed those permitted for the field of the roof.
108.4-FIRE RETARDANT SHINGLES AND SHAKE8
108.4.1 Fire retardant treated wood shingles as Cla~s B roof
coverings. Limited to 15/3.0 in ~inimum plywood decks or nominal
.0 in or thicker, T & S lumber provided with an underlayment of
0.00.0 in polyethylene coated steel foil.
rsl.86ds 5 REV. 9/25/86
108.4.2 Fire retardant treated wood shakes as Class B prepared
coverings. Limited to 15/32 in minimum plywood decks or nominal
2 in or thicker, T & G lumber provided with an underlayment of
0.002 in polyethylene coated steel foil and an interlayment of
one layer of 18 in wide labeled type 15 asphalt non-perforated
felt between shake courses.
108.4.3 Fire retardant treated wood shingles and shakes as Class
O prepared roof coverings. Shakes are to be provided with an
interlayment of one layer of 18-in wide by minimum type 15
asphalt saturated organic felt between shake courses.
109-BUILT UP ROOFS
I09. I-SPECIFICATIONS
Specifications of any manufacturer whose systems are bondable or
guaranteed, whether or not such bond or guarantee is to be
issued, shall be deemed to meet the requirements of this
Standard, provided they do not conflict with the requirements of
the fire district limits.
109.2-SURFACE PREPARATION
109.2.1 Before starting the application of any roofing membrane,
all roof decks shall be broom cleaned and parapet walls, vertical
walls, penthouses and similar structures above the roof level
shall have been completed, and ali 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 roof decks
shall be dry 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.
109.2.2 Gypsum roof decks shall be surface dry before starting
application of roofing. In no case should the application be
started more than 24 hours after the gypsum pouring.
109.2.~ Ail cave
final roofing.
fascia shall be completed by completion of
109.3-BASE PLY
Unless otherwise specified herein, a base ply shall be secured by
mechanical fastening to any nailable deck. 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 p~e-cast~ non-nailable decks a minimum of 1/2 in
fiberboard insulation shall be solidly mopped to a primed
concrete roof deck. Roofing plies shall than be solidly mopped
in accordance with the manufacturer's specification for the
installation of roofing over insulation.
109.4-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 compound applied in accordance with manufacturer's
recommendations. Each additional ply sheet shall be solidly
mopped to preceding ply sheet.
rsI.86ds 6
REV. 9/25/86
109.5-FASTENERS
Nails in nominal I in lumber shall not be smaller than 12 gage
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 nailabie 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 requirements. Aggregate materials shall be
embedded in a pour coat of hot bitumen (not mopped) and shall not
be used on roof slopes greater than 3:12. Aggregate shall comply
with ASTM D 1863 or iocally obtainable gravel sized according to
manufactures specifications.
109.?-SLOPES AND MATERIALS
109.?.1 For roof slopes zero to and including 1/4:12, coal tar
pitch (ASTM D 450, Type 1) or coat tar bitumen (ASTM D 450, Type
III) and Type 15 coal tar saturated felt shall be used.
109.?.2 For roof slopes zero to an including 1/2:12, dead level
asphalt (ASTM D 312, Type I) arid Type 15 asphalt saturated felt,
Type 15 asbestos felt, or asphalt impregnated glass fiber mat
shall be used.
109.?.~ For roof slopes 1/2:12 up to and including 1 1/2:12,
flat asphalt (ASTM D 312, Type II) and Type 15 asphalt saturated
felt, Type 15 asbestos felt, or asphalt impregnated glass fiber
mat shall be used.
109.7.4 For roof slopes i:12 up to and including 3:12, steep
asphalt (ASTM D 312, Type III) arid Type 15 asphalt saturated
felt, Type 15 asbestos felt, or asphalt impregnated glass fiber
mat shall be used.
109.?.5 For roof slopes 2:12 up to arid including 6:12, special
steep asphalt (ASR. TM D 312, Type IV) and Type 15 asphalt
saturated felt, Type 15 asbestos felt, or asphalt impregnated
glass fiber mat shall be used.
1!O-SLATE OR MINERAL SURFACED ROLL ROOFING
1lO. I-MATERIAL AND INSULATION
110.1.1 Underlayment shall be one Type 30 felt fastened by tin
caps having a minimum diameter of I 5/8 in.
110.1.2 Mineral surface roll roofing (organic) having a ~inimum
weigh~ of 74 lbs per 100 sq ft or mineral surfaced roll roofing
(inorganic) having a minimum weight of 63 lbs per I00 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.~ The edges of sheathing at eaves arid gable ends in ail
cases~ shall be covered arid protected with a noncorrosive metal.
110.1.4 Mi~erat surfaced roof may be two layers of type 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 tha~ 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.
psl.86ds ? REV. 9/25/86
III-METAL ROOFS
III. l-MATERIALS
111.1.1 Copper shall weigh not less than 16.c,z per sq ft.
111.1.2 Galvanized sheet metal shall be O. Ol?9-in (26 ga)
thick or heavier, .90 cz (total weight both sides) zinc
per sq ft.
coat lng
111.1.5 Lead:
ft.
hard lead, 2 lb per sq ft; soft lead, 3 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 specifications.
111.1.5 Aluminum, 0.024-ir, thick.
lll. 2-FASTENERS
111.2.1
roofs.
111.2.2
111.2.5
Hard copper or copper alloy shall be used for
Hot dipped galvanized for galvanized roofs.
Aluminum nails for aluminum roofs.
copper
lll.~-METAL SHINGLES
111.3.1 Galvanized shingles, 8 in x 12 in maximum size, minimum
uncoated thickness of 0.0149 in (28 ga).
111.5.2 Aluminum shingles, minimum thickness 0.019 in, 12 in x
48 in maximum size. Rosin paper shall be used under metal ir,
addition to underlay.
II1.4-FLAT SHEE~ ROOFING
Seams and joir, ts on fiat sheet roofing
soldered and made watertight.
shall be locked and
lll.5-OORRUGATED SHEETING
Corrugated, Five-V crimp, or other type of industrial roofing, to
be securely ~ail~d with lead head or washered-neoprene nails.
lll.6-SHEETIN8 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.
III.?-MINIMUM SLOPE NONSOLDERED SEAMS
Minimum slope for all lapped, nonsoldered seam metal roofs shall
be~ ?:12.
ll2-SYNTHETIC SHEET MEMBRANE ROOFS
I12.1-GENERAL
112.1.1 For the purpose of this Standard, synthetic sheet
~embrane roofs (hereafter referred to as "membrane") include
elastomeric a~d plasteromeric preformed sheet materials and
~odified bituminous sheet materials, both reinforced and
nonreinforced, which are typically, but not necessarily,
installed in single layers.
rsl.86ds 8
REV. 9/25/86
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 to membrane application.
Preservative treated wood nailers shall be installed at the
perimeter of the roof, around all roof vents, skylights and
similar penetrations, and all membrane terminations, unless
1. the roof membrar~e 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 fastened 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.
ll2.2-MATERIALS
112.2.1 There shall be no co-mingling of differerst types of
materials except through proper adapters. In all cases, approved
methods and sealers designed for the particular elasto/plastic
materials shall be used.
118.8.8 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 return without force to approximately its original length in
a short time.
118.8.3 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 some stage in its manufacture or processing into
finished articles, can be shaped by flow.
112.2.4 Membrane, material shall be a minimuw O. 040-in thick.
118.8.§ Flashing, Elasto/Plastic material, cured or uncured,
shall be minimum O. 040-in thick. Composite flashings shall be
~inimum O. 030-in ~hick.
ll2.3-APPLICATION
The membrane shall
following methods:
be applied by one or a combination
of the
112.3.1-ADHERED METHOD
112.3.1.1 Substrate. The substrate to which the ~embrane 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 shal 1 be free from defects.
Lap joints shall be fabricated in accordance with ~anufacturers
req u i rements.
rsl.86ds 9
REV. 9/25/86
112.3.1.3 Adhesives. Adhesives shall be applied in accordance
with manufacturer' s requirements, and within the weather
limitations prescribed by the manufacturer.
112.3.1.4 Mechanical Fastening. The membrane and the perimeter
system shall be mechanically fastened at the perimeter of the
roof, around ali roof vent, skylight and similar penetrations,
and at ali membrane terminations. Mechanical fastening shall be
conducted in accordance with manufacturer's requirements.
112.3. 1.5
the base
appl led.
Flashing. Flashing materials shall be compatible with
membrane materials and substrates to which they are
112.3.6 Protective Coatings. Protective coatings shall
applied in accordance with manufacturer's requirements.
be
112.3.~ PARTIALLY ADHERED & MECHANICALLY FASTENED METHODS
112.3.2.1 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. 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.
I12.~.~.2 Membrane. The membrane shall be free from defects.
Lap joints shall be fabricated ir, accordance with manufacturer's
requirements.
112.3.2.3 Adhesives. Adhesives shall be applied in accordance
with manufacturer's requirements, and within the weather
limitations prescribed by the manufacturer.
112.3.~.4 Mechanical Fastening. The membrane and the perimeter
flashing system shall be mechanically fastened at the perimeter
of the roof, around ali roof vent, skylight and similar
penetrations, at ail membrane terminations, and as required
within the field of the roof by the manufacturer.
I12.~.2.5 Flashing.
the base membrane
applied.
Flashing materials shall be compatible with
materials and substrate to which they are
112.~.2.6 Protective Ooatings. Protective coatings shall
applied in accordance with manufacturer's requirements.
be
112.~.~.? Ballast. Ballast shall conform to and be applied in
accordance with manufacturer's requirements. Systems requiring
ballast Shall not be used on roof slopes greater than 1:12.
112.3.3 LOOSE LAID/BALLASTED METHOD
I12.3.3.1 8ubstrate. 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.~.3.2 Me~brane. The membrane shall be free from' defects.
Lap joints shall be fabricated in accordance with manufacturer's
req u i r emer~ t s.
11~.3.3.3 Adhesives. Adhesives shall be applied in accordance
with manufacturer's requirements and within the weather
limitations prescribed by the manufact, urer.
rsl.86ds 10
REV. 9/25/86
112.3.3.4 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, and at all membrane terminations. Mechanical
fastening shall be conducted in accordance with manufacturer's
requirements.
112.~.~.5 Flashing.
the base membrane
applied.
Flashing materials shall be compatible with
r~aterials and substrates to which they are
112.~.3.6 Protective Coatings. Protective coatings shall
applied in accordance with manufacturer's requirements.
be
112.~.~.? Ballast. Ballast shall conform to and be applied irs
accordance~with ~anufacturer's requirements. Systems requiring
ballast shall not be used on roof slopes greater than 1:!2.
ll2.4-PREOAUTIONS
The ~anufacturer's published installations and details shall
strictly adhered to and a copy of the instructions shall
available at ail times on the job site during installation.
be
II~-REROOFINS/REOOVERIN8
The requirements of
reroofing/recovering.
this section shall govern
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 reroofi~g/recovering operation.
ll~.2-INSTALLATION
Reroofing rather than recovering shall be utilized in the
following cases:
1. When old roofing 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.
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 type
roofing material.
rsl.86ds 11
REV. 9/~5/86
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
ll4. I-GENERAL
114.1.! Flashings shall meet the requirements of this section,
except as otherwise specified in this standard.
114.1.2 All metal flashing installed east of Federal
U.S. ~1 shall be a minimum of 16 ounce copper or
stainless steel.
Highway
26 gauge
114.1.3 Intersection of Flat 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.
ll4.2-RIGID SHINGLE ROOF COVERINGS
114.2.1 Flash and counterflash with metal.
114.2.2 All flashing, except drip edge, shall be a minimum or
16 in. wide and shall be a minimum of 16 ounce copper or 26 gauge
stainless steel.
114.8.3 Chimneys, stucco, brick or walls that would be damaged
by cutting to install metal cap flashing may have ~etal cap
flashing approved by the Building Official.
ll4.3-ASPHALT/FIBERGLASS SHINGLE ROOF COVERING
114.3.1 F!a~hings. base and cap flashings s~all be installed in
accordance with manufacturer, s instructions. Base cap flashings
shall be corrosion resistant metal of minimu~ thickness in
accordance with TABLE-114.3.2 VALLEY AND FLASHING MATERIALS.
114.3.2 All 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-II4.3.2
VALLEY AND FLAGHING MATERIAL
MINIMUM
MATERIAL THICKNESS GAGE WEIGHT
COPPER - - 16 OZ.
ALUMINUM 0.025 IN - -
STAINLESS STEEL - 26 -
GALVANIZED STEEL - 26 -
ZINC ALLOY 0.027 iN - -
LEAD - - ~ POUNDS
PAINTED TERNE - - 20 POUNDS
NOTE: All metal flashing installed east of Federal Highway U.S.
#1 shall be a minimum of 16 ounce copper or 26 gauge stainless
steel.
rsl.86ds 12
REV. 9/25/86
l14.4-WOOD SHINGL£S AND SHAKES
I14.4.1 Roof valley flashing shall be provided of not less than
16 ounce copper or 26 gauge stainless steel and shall extend at
least 11 in from the centerline each way. Flashing shall be "W"
shape with a 1 in high center crimp and shall have an end lap of
not less than 4 in.
114.4.2 Wall to roof intersection flashing shall be 16 ounce
copper or 26 gauge stainless steel and shall extend 4 in tip the
wall and 5 in onto the roof.
ll4.5-BUILT UP ROOFS
114.5.1
On cant
methods.
Base flash with a bitumioous built-up flashing material
strips and cap flash with metal or other approved
114.5.~ Corrosion-resistant metal shall be used for cap or
counterflashing. See TABLE-iI4.3.2. VALLEY AND FLASHING MATERIAL.
114.5.~ When a bituminous base .flashing is used, a minimum of
two plies of type 15 asphalt saturated felt or glass fiber ply
sheets or asbestos felts shall be installed with steep 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 type 15 asphalt saturated 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.
ll4. G-GRAVEL STOP
114.6.1 Gravel stop shall have a minimur~ 3/4 in rise above the
roof flange, out onto roof a minimum of 3 ir,, fastened a minimum
of 6 in no center.
I14. G. 2 Overlap shall be a minimum of 4 in. Another method of
joint cor~struction as approved by the Building Official may be
used.
114.6.~ Ail joints shall be sealed with plastic cement.
114.6.4 Gravel stop shall be installed on top of ail mopped
felts in a layer of plastic cement and then stripped with two
layers of felt, each embedded in a mopping of hot asphalt with
the first strip of a minimum of 4 in wide and the top strip a
minimum of 6 in wide.
114.6.5 Metal flashing flanges to be set, nailed and stripped in
accordar, ce with gravel guard application specifications.
114. G. 6 An approved nailer is required for gravel stop and metal
flashing flanges.
114.6.'7 Gravel stop shall comply with the minimum values listed
in TABLE-II4.6.7 GRAVEL STOP-DIMENSIONS AND MATERIAL.
rsl. 86ds 13
REV. 9/25/86
TABLE-iI4.6.?
GRAVEL STOPS-DIMENSIONS AND MATERIAL
HEIGHT OF GALVANIZED
GRAVEL STOP STEEL(GAGE)
COPPER ALUMINUM ZINC STAINLESS
(CZ) (INCHES) ALLOY STEEL(GAGE)
(IN)
4 26 16 0.025 0.020 26
5 24 16 0.032 0.027 26
6 22 20 0.040 0.027 24
? 22 20 0.040 22
8 20 20 0.050 20
II4.?-DRIP EDGE FOR EAVES AND SABLES
114.?.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.?.2 Eave drip shall extend 1/4 in below sheathing arid extend
back on the roof a minimum of 1 1/2 in. This applies to both new
and old roofs.
114.7.~ EXCEPTIONm This section does not apply to wood shingles
or shakes.
114.7.4 See TABLE-114.3.~. VALLEY AND FLASHING MATERIALS.
ll4.8-CHIMNEYS
Cricket or saddle coverings shall be metal.
VALLEY AND FLASHING MATERIALS.
See TABLE-II4.3.2.
ll4.9-PARAPET WALLS
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 type 15 asbestos felt in solid layer of
plastic cement.
II4. IO-OPENINGS IN ROOF
114.10.1 Ail plumbing and electrical pipes shall be flashed with
an appropriate lead boot~ copper or galvanized sheet r~etal
~flashing.
114.!0.2 In any reroofing applicatior,, all base flashings o~
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.~ Metal flashing flanges to be set, nailed and stripped
in accordance with gravel stop applications specifications.
I15-APPROVED LIQUID APPLIED ROOFING MATERIALS
lIS. I-GENERAL
The use of liquid applied roofing materials shall be in
accordance with the manufacturer's recommendations. 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 materials shall be in compliance
with the manufacturer's specification. In any event, the minimum
dry thickness shall be 15 mils.
rsl.86ds 14
REV. 9/25/86
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, oily wax and laitance. A prir~er
may be recommended by the manufacturer.
ll~.~-APPLIOATION
The applicator shall be familiar with the system and application
equipment either through previous experience, training or
assistance provided by the manufacturer's ~epresentative 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 materials 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
instructions.
ll~.4-ROOF SLOPE
The minimum recommended roof slope is 1/4:12 (2%).
pond water are not acceptable.
Roofs which
I15.~-PRECAUTIONS
The manufacturer's published installations and details shall
strictly adhered to and a copy of the instructions shall
available at ail times on the job site during installation.
be
ll6-FOAMED IN PLACE ROOF INSULATION
ll6.1-SENERAL
116.1.1 Foamed in place roof insulation, when used in
conjunction with a waterproof and protectiv~ surface coating
shall be applied in accordance with the manufacturer's
recommendations. Quality of the foam surface shall be
essentially smooth, free of voids, crevices and pinholes,
Protective surfacing materials shall be applied no less than 2
hours nor more than 72 hours following the application of the
foam.
116.1.8 When liquid applied surfacing is used, requirements of
115 apply. When elastomeric or plastomeric protection is used,
requirements of 112 apply.
rsl.86ds 15
REV. 9/25/86
NOTES~
ps2. cov