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SECTION 07 61 13
PREFORMED SWL METAL ROOFING
Part 1 - GENERAL
1.01 WORK INCLUDED All Labor, materials, and equipment
to complete roofing, penetrations, flashings, and associated trim
as indicated in the drawings. (Minimum scope for roof contract.)
1.02 RELATED WORK specified elsewhere includes: Sidings,
insulation vapor barrier, structural support framing, purlins or
sleepers, decking or sheathing, vents, louvers, skylights, gutters,
downspouts. (Delete or include in 1.01 as applicable.)
1.03 REFERENCE STANDARDS current edition of each
applies. (Delete those not required.)
A. Aluminum Association - AA: "Specifications for Aluminum
Sheet Metal Work In Building Construction Specifications for
Aluminum Structures Standards and Data"
B. American Iron and Steel Institute - AISI Light Gauge
Cold-Formed Steel Design Manual
C. American Society of Testing Materials –
&nsbp;ASTM A653 Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron
&nsbp; Alloy-Coated (Galvanealed) by the Hot Dip Process
&nsbp; A525 General Requirements for Galvanized Steel Sheet
&nsbp; A792 General Requirements for Aluminum-Zinc Coated Sheet
&nsbp; B209 Aluminum Alloy Sheet and Plate
&nsbp; D1056 Flexible Cellular Materials
&nsbp; E1592 Structural Performance by Air Pressure Difference
(Note: Add ASTM Tests called for in Finish Section.)
D. National Forest Products Association - NFPA: "National
Design Specifications for Stress Grade Lumber and Its
Fastenings"
E. National Roofing Contractors Association
NRCA "The NRCA Construction Details"
F. Sheet Metal and Air Conditioning Contractors National
Association - SMACNA: "Architectural Sheet Metal Manual"
G. Metal Construction Association - MCA
1.04 SUBMITTALS
A. Shop Drawings must be in scale large enough to clearly show
all layers. Include dimensions of fabricated work reference
dimensions to the structure type, size and spacing of fasteners,
material thickness, and finishes, plan layout with erection
sequence and coordination required with other trades. Shop
drawings must be reviewed and approved by the architect prior
to commencement of work.
B. Submit with the drawings copies of performance data on the
panels, anchor clips, fasteners, material samples of mock-ups
required.
C. Prior to completion submit quality control data certifying that
materials furnished for the project are the same as those tested.
1.05 GUARANTEES Prior to completion of the project
submit:
A. Panel manufacturers' (__)-year warranty on finish durability.
(Note warranty exclusions for corrosive conditions.)
B. Panel manufacturers' and Subcontractor's (__)-year
guarantee against structural defects or corrosion, and
workmanship and leaks.
Part 2 - PRODUCTS
2.01 ACCEPTABLE MANUFACTURERS
A. SWL Roofing as Manufactured by Metecno-Morin Corporation,
or alternates approved by architect prior to bid date.
B. Manufacturer shall have had at least ten years experience in
architectural roofing, and the roof panel itself shall have been in
use for at least ten years. Manufacturer shall demonstrate past
experience with examples of projects of similar type and
exposure.
C. The installer shall be authorized by the panel manufacturer,
and the actual work shall be supervised by personnel trained in
proper application of the product. The installer shall have
capability for preparation of shop details and fabrication of all
flashings not furnished by the panel manufacturer.
D. Alternate products must be submitted in writing to the
architect at least ten days prior to bid date. Request shall
include technical data on all characteristics of the proposed item
and list all deviations from these specifications.
2.02 MATERIALS - PANELS AND SHEET
A. Panels shall be fabricated in full lengths from ridge to eave
without end laps. Panels shall be 12", 16”, 18”, 22” (Metecno-Morin East) and
24” (Metecno-Morin West) wide with concealed anchors that resist wind uplift
yet permit expansion and contraction with temperature changes. Standing ribs
1 ¾” high shall have a continuous groove capillary break. Two intermediate stiffener ribs
shall be located in the flat pan to minimize oil canning and telegraphing of structural members.
Panels shall be:
- Embossed or Non-Embossed Prefinished 3003 or 3004 H14 aluminum per ASTM A653 and A525
- Galvalume 40 ksi finished steel per ASTM A792
- Panel thickness shall be 24 gauge, 22 gauge steel; 0.032 aluminum
B. Flashing shall be same material type and finish as the roof
panel but the temper may be reduced to facilitate forming.
Minimum thickness shall be the same as the roof panel.
C. Color finish shall be Kynar 500® PVDF or Hylar 5000 70% minimum polyvinylidene fluoride (PVDF) acrylic resins (0.8 mil minimum dry thickness applied over a 0.2 mil minimum manufacturer’s recommendations). Color shall be Metecno-Morin color _____________ and shall carry a ____ year warranty. Reflective specular gloss of 10 or less at 85° when tested in accordance with ASTM D523.
D. Product Performance
- Structural-Uniform load capacity shall be determined by testing in accord with the principles of ASTM 1592.
- Design capacity for conditions of gauge, span, or loading other than those tested may be determined by interpolation of test results. Extrapolation outside of the range of the tests is not acceptable.
- Weather tightness - When tested in accord with the principles of NAAM TM-I, the roof system without sealant in the ribs shall show no leakage when exposed to dynamic rain and wind velocity to 70 mph for five minutes.
- (Insert appropriate finish test standards)
- (Insert Underwriters Wind Uplift Class 90 if applicable)
2.03 MATERIALS - ACCESSORY ITEMS
A. Anchor clips to be determined by wind uplift resistance
(See load chart). Fasteners in supports and screws installed in lips shall be fully recessed so
that no sharp edges come into contact with the roof material.
Clips shall be designed to allow for expansion and contraction of
the roof relative to the structure throughout the temperature
range specified in 3.02D.
B. Screws holding anchor clips to the structure shall be:
Into wood: stainless steel (or plated steel)
Into steel: stainless steel, cadmium plated self-tapping screws into
predrilled holes (or plated hardened steel self-drilling screws).
C. Exposed fasteners shall be aluminum or stainless steel. For
weather tightness, screws shall have separate washers with hot
bonded neoprene faces, and pop rivets shall be set in wet sealant.
Exposed fasteners shall be a minimum #14 size screw or 3/8"
diameter rivet.
(Note: Aluminum may not be suitable for some steel products;
consult the fastener supplier)
D. Precut foam profile closures shall be closed cell foam
meeting specification. Field fabricated hip closures shall be closed cell foam block supported
and protected from weathering by a metal channel matching the
roof flashing.
E. Sealant used with the roofing shall be applied between
surfaces during assembly with a minimum amount exposed on the
completed installation.
- Concealed sealant may be a non-curing, non-skinning butyl, polyisobutylene or polybutane tape of sufficient thickness to make full contact with both surfaces.
- Exposed sealant shall be a curing type with excellent weather and sunlight resistance. Color shall be as selected by architect. Apply in accordance with the sealant manufacturers recommendations.
F. Underlayment, when used, shall be Ice and Water Shield.
2.04 FABRICATION
A. Minimum inside bend radius on flashing shall be 3T and all
edges shall have an open hem for stiffness.
B. Fabrication tolerances shall be as required by the Metal
Construction Association. (MCA)
2.05 PERFORMANCE REQUIREMENTS
A. The installation shall be designed to safely resist the positive
and negative loads as specified below:
Roof covering
+_____ psf -_____ psf
Roof ridges, eaves, and rakes
+_____ psf -_____ psf
Ridge ends, eave, and rake corner
+_____ psf -_____ psf
B. Deflection of the standing seam rib shall be limited to L/240
but in no case greater than 3/4"
C. Roof panels shall be able to support walking loads without
excessive distortion or telegraphing of the structural supports.
For the maximum span used on the project, panels shall
withstand a 250 lb. concentrated load applied to a four square
inch pad located at the center of the panel flat without buckling
of the rib or noticeable permanent distortion of the panel.
Supports and walkways (Solar panels, radio antennas) shall be
capable of carrying the design loads indicated on the contract
drawings.
D. Snow guards shall be located as shown on the contract
drawings. Each snow guard shall be attached to the roof panels in
a manner capable of resisting a sliding force to the slope of ____
lbs. The roof panel attachment to the structure shall be capable
of resisting a force parallel to the slope of ____ lbs. per linear
foot.
E. Roof panel and flashing attachments shall be designed to
accommodate the thermal expansion and contraction of the
exterior material through a ___ of temperature change.
F. Factors of safety on design loads to ultimate strength of
fasteners shall be as stated in the industry standard for the
material into which the fastener is driven. Aluminum Association
for Aluminum; AISI for steel; NFPA for wood; APA for
Plywood. Allowable holding power for concrete shall be as
specified in the building code for the product and grade of
concrete involved.
G. Panel system shall have a Class "A" rating as a deck by
Underwriters Laboratories Inc.
Part 3 - EXECUTION
3.01 INSTALLATION
A. Storage and Handling - Protection shall be provided during
fabrication, shipment, storage, and erection. During shipment
finished surfaces shall be protected from abrasion by a
Removable plastic film between areas of contact. Jobsite storage
shall be in a clean dry area out of direct contact with the ground,
under cover or sloped for drainage, protected from abuse by
traffic and from contamination by corrosive or staining materials.
Stored materials and unfinished work shall be secured against
wind damage. Installed panels shall be protected from abuse by
other trades. It shall be the responsibility of this contractor to
provide walk boards in areas of heavy traffic and any other
measures required to prevent damage by his own crews and
notify the General Contractor of any necessity for protection
from other trades.
B. Before Installation - The contractor shall verify that the
structure is ready to receive his/her work. He/she shall check
field dimensions and alignment of structural steel to assure that
the roof panels and flashing will be straight and true. The
architect shall be notified on unresolved conditions which may
adversely affect the performance or appearance of the installed
roof panels and work on that location will not proceed until
approved by the architect.
C. All work shall be installed in accord with approved shop
details under direct supervision of an experienced sheet metal
craftsman. Attachments and joints shall allow for expansion and
contraction from temperature changes without distortion or
elongation of fastener holes. Flashing shall be installed in strict
accord with the recommended practice in the MCA, AA,
NRCA and SMACNA architectural sheet metal manuals:
without fasteners in end laps and isolated from dissimilar
materials.
D. Completed work shall be plumb and true, free of scrapes and
dents. Panel ribs shall be on the module indicated in the contract
drawings within the tolerance allowed by the actual construction
dimensions. Excess sealant shall be removed and touch-up paint
applied to any areas where paint scrapes occur. Any panels
which are badly damaged and in the judgment of the architect
cannot be repaired, shall be removed and replaced.
E. As much as possible, attachment screws shall be eliminated in
favor of concealed cleats or clips.
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