SCOPE
This
specification covers the requirements for metal siding, roofing and interior
wall and shall include contractor's designing, detailing, fabricating,
furnishing, installing, inspecting and testing of the work and shall conform to
the requirements of this specification and as shown on the drawing.
WORK
INCLUDED
Designing
detailing, fabricating, furnishing and installing metal siding and roofing,
with all penetration through the siding, walls and roofing.
Interior
metal wall works.
Louvers,
sunshades, and other appurtenances.
Detailing,
fabricating, furnishing and installing all Rain Water Gutters, Flashing,
fasteners and other material necessary to ensure a watertight construction.
Furnishing
and insulation for siding and roofing and wall as required.
Surface
protection and painting.
CODES AND STANDARDS
Comply
with the requirements of the applicable codes and standards published by the
following organisations:
AISI American
Iron Metal Institute
ANSI American
National Standards Institute
ASTM American
Society for Testing and Materials
NBS National
Bureau of Standards, USA
SAE Society
of Automotive Engineers,
UL Underwriters'
Laboratories, Inc,
Conform especially to the applicable provisions of the
following codes and standards
ASTM A525 Galvanized
Metal
ASTM
B 1 17 Salt Spray
ASTM
C423 Noise Reduction Coef
ASTM
D3363 Pencil Hardness
ASTM
D2247 Humidity
ASTM
623 Wentherometer
ASTM
D1737 Flexibility
ASTM
D523 Gloss
ANSI
A58.1 Design Load
QUALITY ASSURANCE/QUALITY CONTROL (QA/QC)
Contractor
shall fully comply with the Project Quality Assurance/Quality Control
Requirements. For submitting Quality Assurance/Quality Control Procedures and
Documentation the provision of “Submittals” of this specification shall be
applied.
SUBMITTALS
After the contract signed, the
contractor shall furnish complete and comprehensive data on materials
specification regarding a component and accessories of his propose system for
the Owner's approval.
Test
data and report and the quality control procedures and documentation shall be
submitted to the Owner for review.
Written Warranty on siding & roofing
coating for a minimum period of 10 (ten) years shall be submitted to the
Owner's after acceptance of works.
Engineering calculation shall support the
design in conformance with this specification.
DEFINITIONS
Metal Siding: Exterior enclosure of one
or more sides of a structure, insulated or uninsulated. If the siding is
insulated, it shall consist of exterior metal sheets, insulation, subgirts and
interior Metal sheets (which are the siding components). If the siding is
uninsulated, it shall consist of the single exterior metal sheets only. Both
types of the siding shall also include all related fasteners and other
accessories.
Metal
Roofing. Exterior enclosure of the roof
of a structure, insulated or uninsulated, constructed of the same components,
fasteners and other accessories as for Metal siding (in contrast to metal
decking covered with concrete and/or built-up roofing).
If
the roofs are insulated, the components shall consist of exterior metal sheets
with insulation underneath, and with interior Metal sheets. If roofs are
uninsulated, components shall consist of the single exterior metal sheets only.
Metal
Interior Wall: Enclosure of one or more sides of a space within a structure,
insulated or uninsulated, constructed of the same components, fasteners and
other accessories for metal siding (in contrast to prefabricated metal
partitions or similar constructions). If
walls are insulated, components shall consist of two metal sheets enclosing an
insulation core, and with or without subgirts depending on the method of
construction. If walls are uninsulated, components shall consist of an assembly
of single metal sheets.
Fire
Rated Insulated Fluted metal Siding: To be used where indicated and approved by
the Owner and shall have its exterior fire rated which shall consist of field
assembled panels utilizing a liner panel insulation, subgirts, gypsum board and
fluted extension metal sheet.
DESIGN REQUIREMENTS
STRUCTURAL
REQUIREMENTS
The
Contractor shall be fully responsible for the design of siding, roofs and
interior walls to withstand the specified loads, without exceeding the maximum
allowable unit stresses according to AISI, and without exceeding the allowable
deflections as specified in paragraph below. Subgirts shall be used for all
insulated siding. Panels may be designed
as continuous over two or more spans, according to the girt or purlin spacings
covered.
The
Contractor shall have qualified engineers to perform or supervise the design
work.
Fasteners
for attaching siding, roof and interior wall component to each other and to
grits and other structural supports shall be designed to withstand the
specified loads without exceeding maximum allowable unit stresses for such
fasteners.
The
Maximum allowable deflection for insulated or uninsulated siding, roofs or
interior walls subjected to the design loads shall not exceed 1/180 of the
clear span between grits or purlins, in the direction normal to the plane of
the siding, roof or interior wall.
Design
wind loads shall conform to all applicable requirement of ANSI A58.1, with wind
loads based on a basic wind speed of 120 km/hr, and the minimum design live
load for the roof deck shall be 100 kg/m2.
The
maximum fibre stress shall not exceed for the foregoing specified deflection 14
kg/m² for steel panels.
THERMAL
REQUIREMENTS
The
overall coefficient of thermal transmission U for insulated siding, roofs and
interior walls shall not exceed 0.75 watt/m2 °C
in still air.
Test
data shall be submitted to Owner if requested to substantiate Contractors
claims as to the thermal properties of his materials used for construction.
ACOUSTIC
REQUIREMENTS
If
acoustically treated areas are required, they shall have a Noise Reduction
Coefficient (NRC), in conformance with ASTM C423, of not less than 0.85 and the
Contractor shall submit a test report to the Owner if requested to support his
claims for the NRC value of his materials used for construction.
WEATHERTIGHTNESS
All
completed siding and roofs shall be weather watertight and dust tight.
Provision
shall be made, in the design of insulated siding to drain to the exterior of
siding of any condensation forming within the assemblies.
STORAGE
All siding materials, components,
fasteners and other accessories shall be stored dry, off the ground and under
protective cover, in a satisfactory manner.
The
Contractor shall arrange with the Owner for temporary storage of materials not
erected, and shall be responsible for storing these materials in such a manner
as to preclude damage, deterioration, etc.
All costs for such protection shall be included in the Contract Price.
MATERIALS AND DETAILS
METAL
SHEETS
Metal
sheets shall be of steel and be compatible with the coat finish system. Cold
rolled steel sheets of structural quality shall confirm to the requirement of
ASTM A446, Grade B, G 90 “Zinc Coated Steel Sheets”. European Norm EN 10142 :
1990, EN. 10147: 1992 with galvanize Z 275 gr/m². Two side at three point test
according to EN 10142: 1990.
The
metal thickness shall comply with one of the following requirements.
a)
Metal thickness shall be
determined from the defined loading requirements, but shall be not less than
that determined from the width-of-flat surface in accordance with the following
table. Beads may be incorporated into flat surface to reduce the width-of-flat.
3-inch flat
4-inch flat
6-inch flat
US Std. 22 ga
US Std. 20 ga
US Std. 18 ga
b)
The thickness shall be
minimum 0.72 mm nominal thickness (TCT) up to maximum 0.85 mm TCT regardless of
loading and span when sheets are fluted as required for loading and span.
METAL
SHEET FINISHES
Finish
of siding, roofing, trim, flashing and gutter shall be one of the following
specified coatings, coil coated on the sheets metal prior to forming, and
modified as necessary to comply with the requirements defined in section
“Coating Test”.
Finish
coating shall comprise of PVF2 Plus, a double-two layer polyvinylidene fluoride
applied on primer for both exterior and interior surface on insulated or
uninsulated roof and wall panels.
The
“PVF2 Plus” acting as top coat, is a double coated “PVF2 Kynar 500”, a 80 % or
80/20 fluorocarbon (polyvinylidene fluoride) applied to the special steel
substrate in accordance with the requirements of the metal siding and roofing
fabricator but conform with the metal sheet requirement as stipulated on
previous section.
Total
dry film thikness of min. 46 microns composed of both an epoxy corrosion
inhibitive premier and the top coat PVF2 plus Kynar 500.
The
color of reverse side shall be light gray or standard manufacturer’s light
gray. The final colour coat of steel cladding shall be submitted to the
employer / owner for approval.
Acoustic
Treatment
Where
an acoustic treatment is required for insulated siding, or roofing, the
interior sheet shall be fully perforated with 3.0 mm diameter holes and 5 mm
triangle spacing that will provide NRC value of not less than 0.85 as specified
in Clause mentioned before.
INSULATION
Where
insulated siding & roof (external wall & electrical room) is indicated,
the insulation shall conform to the following requirements:
Material:
shall be fibrous glass, rock or slag with minimum density of 60 kg/m3.
The
roof insulation shall be reinforced on down face with vinyl or aluminum foil.
The thickness of vinyl shall not be less than 0. 0 1 mm and the thickness of
aluminum shall not be less than 0.0025 mm.
The
wall insulation shall be completely enclosed with 150-micron thick polyethylene
protective cover.
Thickness
of insulation: shall be a minimum of 3.75 cm if not otherwise stated.
FIRE
HAZARD CLASSIFICATION RATING
The
layer of insulation, including aluminum foil facing, shall meet the following
Fire Hazard Classification Rating of Underwriter’s Laboratories, Inc:
Flame
Spread = 10- 15
Fuel Contributed = 0
- 5
Smoke Developed = 0
FIRE
RATED EXTERIOR WALLS
The
material shall be the same as insulated exterior metal siding with the addition
of gypsum boards, the thickness and number of which shall be determined for a
two-hour fire rating.
Panel
thickness shall be 3.75 cm nominal overall.
Interior
panel sheets shall be galvanized interior type sheets as refers to section
‘Metal Sheet Finishes’.
INSULATED
INTERIOR WALLS
Panel
thickness shall be 3.75 cm nominal overall.
Panel
sheets shall be galvanized interior type sheets, prime coated similar the
interior metal sheets in section ‘Metal Sheet Finishes’.
FLASHING
Exterior
flashing: material, Pattern and finish shall be same as exterior sheet of
siding and roofs with minimum thickness of 0.70 mm.
Interior
flashing: material shall be galvanized Metal with thickness and finish same as
interior sheet of insulated siding and roofs.
Flashing
shall be provided wherever required but not limited to the following:
Corners,
roofs, ridges, caps, etc.
Beam
penetrations, wall or roof sleeves, duct openings and miscellaneous openings
etc.
FASTENERS
Type
of Fasteners
One
of the following three types of screw Fasteners shall be used as indicated for
the fastening of metal siding, roofs and interior walls:
Type
A: Type A sheet metal screws are those having pointed ends and wide pitch
threads. This type of screw is used for connecting gauge metal to gauge metal.
Type
B: Type B self-tapping screws are those having flat ends and close pitch
threads. This type of screw is used for connecting gauge metal to a structural
member.
Type
AB: Type AB self-tapping screws are those having pointed ends and close pitch
threads. This type of screw is used for
connecting gauge metal to a structural member.
Material:
Shall be type 305 or approved stainless steel with cadmium-plated finish and
the heads painted to match colour of siding.
Size
of Fasteners: No. 12 or larger.
Length
of Fasteners
The
length of type A screw shall be sufficient to engage gauge metal sheets
together with a minimum projection of 1.0 cm beyond the sheet surface.
The
length of the type B or type AB screws shall be such as to engage a sufficient
thickness of supports to which they attached, to develop the full capacity of
fasteners.
PARAPET
CAP
Same
as exterior flashing
CAULKING
& SEALING TAPE
Manufacturer's
standard
LAPS
Lap
fines for siding shall line up all around the building.
End laps at walls and roofs shall be 15 cm minimum and
25 cm minimum respectively.
Side laps shall not be less than 1/2 rib.
Side and end raps in the exterior roof shall be sealed
with mastic tape.
COATING FOR METAL SIDING AND ROOFS
Shall be organic coating and meet the detail requirement
specified on Table in section ’Metal Sheets’.
RAINWATER GUTTERS AND ROOF SHEET METAL ITEMS
Rainwater
Gutters and Supports shall comprised steel sheet plate and must be protected by
beam hot dip galvanized with minimum weight of zinc coating of 0.250 kg/m².
The
outlet surface shall complete with and applied protective colour finish same as
exterior flashing to match the siding.
The
lay out and sizing of gutters and roof drains shall be designed for the maximum
anticipated rain fill intensity at the site, but not less than of 3 mm in 1
minute.
Each
dewatering section shall be provided with at least 2 roof drains and 1 overflow
pipe.
All
sheet metal items shall be rigid, true to line and neat in appearance. They
shall be designed and manufacture in such a way that both soldering work on
site can be reduced to a minimum, and need and easy installation will be
allowed.
Provision
shall be need for separating sheet metal items from wood boards and / or
concrete / plaster surface by mean of adequate roofing felt.
Longitudinal
slope of gutter bottoms shall not be less than 0.5 %.
Box
gutters shall be adequately supported and be designed to support rigidly the
loads and below permanent flow of water.
Gutter
outlets of diameter between 15cm to 20cm shall be provided for connection to
rain water down pipes.
Basket
strainers of non corrosive wire
Overflow
pipes of 10 cm diameters and of lengths between 50cm and 80 cm shall be
provided. The projecting part from the outer alignment of exterior walls and /
or siding shall not be less than 25 cm. Overflow pipes to be routed through
concrete and / or masonry parapet walls shall be wrapped by means of adequate
roofing felt.
Provision
shall be made for expansion joints in box gutters, wall flashings and cap
strips etc. The expansion joints shall be adequate for the type of works
specified. They shall not be spaced more than 10.00 m.
Flashings
shall be provided where required to reach full water tightness. The thickness
of steel shall not be less than 0.7 mm. Cap strips, if required shall have a
girth comprised between 15 cm and 25 cm.
PENETRATIONS,
WALL OR ROOF SLEEVES
Penetrations,
sleeves, duct openings, etc, in siding, roofs, and interior walls shall be
shown on Contractors drawings and shall be soundly designed for weather
tightness.
LOUVERS
Louver
shall comply with the requirement defined in the general technical
specifications refers to sub section ‘Metal Sheets’ and ‘Metal Sheet Finishes’.
The Material, fasteners and finishing shall be the same as the siding material
defined in this general technical specification.
ERECTION
Erection
shall be in strict accordance with manufacturers’ procedure for this type of
work. Care shall be taken to insure that
Metal and aluminium are at all times separated such that a galvanic reaction
cannot take place.
PROTECTION OF INSULATION DURING ERECTION
For
all insulated constructions, satisfactorily protect all insulation from the
weather during erection so as to eliminate soaking of insulation by water, or
other moisture contaminants.
CLEANING OF SIDING, ROOFS AND INTERIOR WALLS
All
exposed faces of siding, metal roofs and interior walls shall be cleaned of
labels, dirt, streaks, caulking or sealing materials, undue discoloration etc.
and as a minimum a dry wipe down shall be provided at the time of erection.
All exposed faces of siding, metal roofs and interior
walls, prior to acceptance by Owner shall be completely satisfactory to the
Owner in appearance.
REMEDY OF DEFECTS IN APPEARANCE
Defects in appearance shall include
nicking, scratching, gouging, dimpling, denting, abrasions, and marring of any
nature due to shipping, storing, handling, erection, weathering etc. and shall
be remedied at Contractors expense as follows:
Touch
up the baked enamel organic coating finish with one or more coats of the same
coating material used for the original finish.
Thickness, appearance and colour of the touch-up shall match adjacent
surfaces. If touch-up is not satisfactory to Owner, damaged sheets or
accessories shall be replaced.
INSPECTION AND TESTING
The
Contractor shall be responsible for all inspection and testing required by this
specification unless otherwise specified. The Owner may during the course of
the work, observe various phases of the work performed by Contractor, at the
Contractors plant and at the site.
Coating Tests
General
The
coating system of the external steel sheet for roof and wall has to meet the
following performance criteria and test results and must be substantiated and
certified by a recognized independent testing organization.
Result
of following tests shall be submitted to the Employer, proving the compliance
with the following requirements.
Colour Change and Fade Resistance
A
sample with a minimum of two raw-cut edges shall withstand a minimum of 60 days
emmaqua weathering test exposure (exterior equatorial mount with mirrors and
water spray) and/or 200.000 Langley’s of ultra violet radiation without
cracking, peeling, blistering or loss of adhesion. Maximum colour change,
including all exterior surface deposits such as dirt or chalk, shall not exceed
2 nbs units.
Abrasion – Resistance Test for Coating System
A
flat specimen shall be subject to abrasion-resistance test. Test shall be
conducted in accordance with ASTM D-968-51 (falling sand) which specifies that
the end point shall be the first appearance of the base metal. Coating system
shall resist abrasion to the extent indicated by the use of not less than 200
litters of sand to procedure a first appearance of base metal.
Coating System Integrity Test
A
sample shall withstand a salt-fog test for a minimum of 1.000 hours in
accordance with ASTM B – 117 – 64, including the scribe requirement in the
test. Immediately upon removal of the specimen from the test, the coating
system shall show no signs of cracking, peeling, blistering or loss of
adhesion.
Pollution-Resistance
Test
A
flat specimen, with no protected edge, shall be subjected to the 30 cycles of
Kesternich testing without blistering, peeling or any other of joss of adhesion.
The Kesternich test consist of eight hours of exposures at 40 ºC.
With
100% relative humidity (condension) in a controlled sulphur dioxide (SO2),
carbon dioxide (CO2) atmosphere. Atmospheric concentrations of pullutant gases
shall be in accordance with Kesternich test standards DIN 50018. This is
followed by 16 hours of dry time, which concludes one cycle of testing.
Humidity-Resistance
Test
A
sample shall be tested for 1000 hours at 100 deg F in accordance with ASTM D –
2247 – 68 with no blistering, peeling or loss adhesion.
Glare-Resistance
Test
A
flat sample shall be tested at 60 deg in accordance with ASTM D – 523 – 67. The
rating shall fall in the 10 to 15 range.
Pencil
Hardness (ASTM D3363) : Shall be F minimum
Weatherometer
(ASTM G23) after 5000 hours exposure in sunshine Arc. Weatherometer or Atlas
Twin Arc Weatherometer, no chalk in excess of No. 8 per ASTM D 659 and no
colour fade more than 5 NBS units perSTM D2244, as operated under Dew Cycle
conditions using 60/60 cycle.
Flexibility
(ASTM D 1737) : Withstand 1T – 2T bends
Gloss
(ASTM D 523) : 25-35 % reflectivity measured on 60 ºC gloss meter.
Impact
: no removal of finish when tested as follows :
Using
as sharp knife, make 6 or more parallel cuts at 1.5 mm intervals through finish
to bare metal.
Cross
hatch similarly.
Reserve
impact to east 92 cm – kg or to point of metal rupture.
Apply
Scotch cellophane tape firmly to scribe impacted are. Remove tape with sharp
pull.
There
shall be no loss of adhesion.
WATER
TESTING
The
completed roofing and siding installation shall be such that absolutely no
water shall leak through. The Employer reserves the right to conduct water
leakage tests on installed roofing and siding at any time during the
installation.
Should
any leakage be discovered during such leakage test. The roofing and/or siding
shall disassemble to the extent directed by the Employer and joints shall be
resealed with specified sealant or tape, and the roofing and/or siding
reinstalled. Joints shall be sealed as directed by the Employer on all
subsequent panels.
Warranty
The
Contractor shall furnish the Owner, upon acceptance installation, a written
warranty that fluorocarbon organic coating has been applied in accordance with
licensee manufacturers process instructions and under normal conditions; and it
shall meet the following standards for a minimum period of 10 years (the
Contractor shall state the number of years warranty and also the number of
times he will replace any defective panels without charges of any kind):
Will
not chalk in excess of ASTM D659 No. 8 rating. Chalk rating shall be determined
by the procedure outlined in ASTM D659.
Will
not change colour more than 5 NBS units as determined in accordance with
procedures set forth in ASTM D 2244, after removal of external deposits and
chalk.
Will not crack, check or peel (lose adhesion).