076200Roofing Replacement May 14, 2015
South Street Apartments
076200 SHEET METAL FLASHING AND TRIM
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SECTION 076200 -SHEET METAL FLASHING AND TRIM
PART 1 -GENERAL
1.1 RELATED DOCUMENTS
A.Drawings and general provisions of the Contract, including General and
Supplementary Conditions and Division 01 Specification Sections, apply to this
Section.
1.2 SUMMARY
A.Section Includes:
1.Formed Products:
a.Formed roof drainage sheet metal fabrications.
b.Formed low-slope roof sheet metal fabrications.
2.Pre-fabricated Products
a.Flue assembly and components
B.Related Sections:
1.Division 06 Section " Miscellaneous Rough Carpentry" for wood nailers, curbs,
and blocking.
2.Division 07 Section "EPDM Roofing" for installing sheet metal flashing and trim
integral with membrane roofing.
1.3 PERFORMANCE REQUIREMENTS
A.General: Sheet metal flashing and trim assemblies as indicated shall withstand wind
loads, structural movement, thermally induced movement, and exposure to weather
without failure due to defective manufacture, fabrication, installation, or other defects in
construction. Completed sheet metal flashing and trim shall not rattle, leak, or loosen,
and shall remain watertight.
B.Fabricate and install roof edge flashing capable of resisting the following forces
according to recommendations in FMG Loss Prevention Data Sheet 1-49:
1.Wind Zone 2: For velocity pressures of 31 to 45 lbf/sq. ft.(1.48 to 2.15 kPa): 90-
lbf/sq. ft.(4.31-kPa)perimeter uplift force, 120-lbf/sq. ft.(5.74-kPa)corner uplift
force, and 45-lbf/sq. ft.(2.15-kPa)outward force.
C.Thermal Movements: Provide sheet metal flashing and trim that allows for thermal
movements from ambient and surface temperature changes.
1.Temperature Change (Range): 120 deg F (67 deg C), ambient; 180 deg F (100
deg C), material surfaces.
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076200 SHEET METAL FLASHING AND TRIM
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1.4 SUBMITTALS
A.Product Data: For each type of product indicated. Include construction details,
material descriptions, dimensions of individual components and profiles, and finishes
for each manufactured product and accessory.
B.Shop Drawings: Show fabrication and installation layouts of sheet metal flashing and
trim, including plans, elevations, expansion-joint locations, and keyed details.
Distinguish between shop-and field-assembled work. Include the following:
1.Identification of material, thickness, weight, and finish for each item and location
in Project.
2.Details for forming sheet metal flashing and trim, including profiles, shapes,
seams, and dimensions.
3.Details for joining, supporting, and securing sheet metal flashing and trim,
including layout of fasteners, cleats, clips,and other attachments. Include
pattern of seams.
4.Details of termination points and assemblies, including fixed points.
5.Details of expansion joints and expansion-joint covers, including showing
direction of expansion and contraction.
6.Details of edge conditions, as applicable.
7.Details of special conditions.
8.Details of connections to adjoining work.
9.Detail formed flashing and trim at a scale of not less than 3 inches per 12 inches
(1:5).
C.Samples for Initial Selection: For each type of sheet metal flashing, trim, and
accessory indicated with factory-applied color finishes involving color selection.
1.5 QUALITY ASSURANCE
A.Fabricator Qualifications: Shop that employs skilled workers who custom fabricate
sheet metal flashing and trim similar to that required for this Project and whose
products have a record of successful in-service performance.
B.Sheet Metal Flashing and Trim Standard: Comply with SMACNA's "Architectural Sheet
Metal Manual" unless more stringent requirements are specified or shown on
Drawings.
C.Copper Sheet Metal Standard: Comply with CDA's "Copper in Architecture
Handbook." Conform to dimensions and profiles shown unless more stringent
requirements are indicated.
D.Preinstallation Conference: Conduct conference at Project site.
1.Meet with Owner, Architect, Owner's insurer if applicable, Installer, and installers
whose work interfaces with or affects sheet metal flashing and trim including
installers of roofing materials, roof accessories, unit skylights, and roof-mounted
equipment.
2.Review methods and procedures related to sheet metal flashing and trim.
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076200 SHEET METAL FLASHING AND TRIM
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3.Examine substrate conditions for compliance with requirements, including
flatness and attachment to structural members.
4.Review special roof details, and condition of other construction that will affect
sheet metal flashing.
5.Document proceedings, including corrective measures and actions required, and
furnish copy of record to each participant.
1.6 DELIVERY, STORAGE, AND HANDLING
A.Do not store sheet metal flashing and trim materials in contact with other materials that
might cause staining, denting, or other surface damage. Store sheet metal flashing
and trim materials away from uncured concrete and masonry.
B.Protect strippable protective covering on sheet metal flashing and trim from exposure
to sunlight and high humidity, except to the extent necessary for the period of sheet
metal flashing and trim installation.
PART 2 -PRODUCTS
2.1 SHEET METALS
A.General: Protect mechanical and other finishes on exposed surfaces from damage by
applying a strippable, temporary protective film before shipping.
B.Copper Sheet: ASTM B 370, cold-rolled copper sheet, H00 or H01 temper.
1.Pre-Patinated Copper-Sheet Finish: Dark brown, pre-patinated according to
ASTM B 882.
2.2 MISCELLANEOUS MATERIALS
A.General: Provide materials and types of fasteners, solder, welding rods, protective
coatings, separators, sealants, and other miscellaneous items as required for complete
sheet metal flashing and trim installation and recommended by manufacturer of
primary sheet metal or manufactured item unless otherwise indicated.
B.Fasteners: Wood screws, annular threaded nails, self-tapping screws, self-locking
rivets and bolts, and other suitable fasteners designed to withstand design loads and
recommended by manufacturer of primary sheet metal or manufactured item.
1.General: Blind fasteners or self-drilling screws, gasketed, with hex-washer head.
a.Exposed Fasteners: Heads matching color of sheet metal using plastic
caps or factory-applied coating.
b.Blind Fasteners: High-strength aluminum or stainless-steel rivets suitable
for metal being fastened.
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076200 SHEET METAL FLASHING AND TRIM
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2.Fasteners for Copper Sheet: Copper, hardware bronze or Series 300 stainless
steel.
C.Solder:
1.For Copper: ASTM B 32, Grade Sn50, 50 percent tin and 50 percent lead.
D.Elastomeric Sealant: ASTM C 920, elastomeric silicone polymer sealant; low modulus;
of type, grade, class, and use classifications required to seal joints in sheet metal
flashing and trim and remain watertight.
2.3 MANUFACTURED FLUE ASSEMBLY
A.Single wall flue liner including roof plate, rain cap and flue pipe.
1.Stainless Steel: 24 gauge; Type 304
a.Products: Subject to compliance with requirements, available products that
may be incorporated into the Work include, but are not limited to, the
following:
1)Rockland Chimney Supply.
2.Accessories:
a.Fire safing and sealant
1)Certainteed mineral fiber batts
2)GreatStuff FireBlock
3.Fasteners for Stainless-Steel Sheet: Series 300 stainless steel.
2.4 FABRICATION, GENERAL
A.General: Custom fabricate sheet metal flashing and trim to comply with
recommendations in SMACNA's "Architectural Sheet Metal Manual" that apply to
design, dimensions, geometry, metal thickness, and other characteristics of item
indicated. Fabricate items at the shop to greatest extent possible.
1.Fabricate sheet metal flashing and trim in thickness or weight needed to comply
with performance requirements, but not less than that specified for each
application and metal.
2.Obtain field measurements for accurate fit before shop fabrication.
3.Form sheet metal flashing and trim without excessive oil canning, buckling, and
tool marks and true to line and levels indicated, with exposed edges folded back
to form hems.
4.Conceal fasteners and expansion provisions where possible. Exposed fasteners
are not allowed on faces exposed to view.
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076200 SHEET METAL FLASHING AND TRIM
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B.Fabrication Tolerances: Fabricate sheet metal flashing and trim that is capable of
installation to a tolerance of 1/4 inch in 20 feet (6 mm in 6 m)on slope and location
lines as indicated and within 1/8-inch (3-mm)offset of adjoining faces and of alignment
of matching profiles.
C.Fabrication Tolerances: Fabricate sheet metal flashing and trim that is capable of
installation to tolerances specified in MCA's "Guide Specification for Residential Metal
Roofing."
D.Sealed Joints: Form nonexpansion but movable joints in metal to accommodate
elastomeric sealant.
E.Expansion Provisions: Where lapped expansion provisions cannot be used, form
expansion joints of intermeshing hooked flanges, not less than 1 inch (25 mm)deep,
filled with butyl sealant concealed within joints.
F.Fabricate cleats and attachment devices from same material as accessory being
anchored or from compatible, noncorrosive metal.
G.Fabricate cleats and attachment devices of sizes as recommended by SMACNA's
"Architectural Sheet Metal Manual" for application, but not less than thickness of metal
being secured.
H.Seams: Fabricate nonmoving seams with flat-lock seams. Tin edges to be seamed,
form seams, and solder.
I.Seams: Fabricate nonmoving seams with flat-lock seams. Form seams and seal with
elastomeric sealant unless otherwise recommended by sealant manufacturer for
intended use.
J.Do not use graphite pencils to mark metal surfaces.
2.5 LOW-SLOPE ROOF SHEET METAL FABRICATIONS
A.Roof-Edge Flashing and Fascia Cap: Fabricate in minimum 96-inch-(2400-mm-)long,
but not exceeding 10-foot-(3-m-)long, sections. Furnish with 6-inch-(150-mm-)wide,
joint cover plates.
1.Joint Style: Butt, with 12-inch-(300-mm-)wide, concealed backup plate.
2.Fabricate from the following materials:
a.Copper: 24 oz./sq. ft.
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076200 SHEET METAL FLASHING AND TRIM
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PART 3 -EXECUTION
3.1 EXAMINATION
A.Examine substrates, areas, and conditions, with Installer present, to verify actual
locations, dimensions and other conditions affecting performance of the Work.
1.Verify compliance with requirements for installation tolerances of substrates.
2.Verify that substrate is sound, dry, smooth, clean, sloped for drainage, and
securely anchored.
B.For the record, prepare written report, endorsed by Installer, listing conditions
detrimental to performance of the Work.
C.Proceed with installation only after unsatisfactory conditions have been corrected.
3.2 UNDERLAYMENT INSTALLATION
A.General: Install underlayment as indicated on Drawings.
B.Polyethylene Sheet: Install polyethylene sheet with adhesive for anchorage to
minimize use of mechanical fasteners under sheet metal flashing and trim. Apply in
shingle fashion to shed water, with lapped and taped joints of not less than 2 inches
(50 mm).
C.Felt Underlayment: Install felt underlayment with adhesive for temporary anchorage to
minimize use of mechanical fasteners under sheet metal flashing and trim. Apply in
shingle fashion to shed water, with lapped joints of not less than 2 inches (50 mm).
D.Self-Adhering Sheet Underlayment: Install self-adhering sheet underlayment, wrinkle
free. Apply primer if required by underlayment manufacturer. Comply with
temperature restrictions of underlayment manufacturer for installation; use primer
rather than nails for installing underlayment at low temperatures. Apply in shingle
fashion to shed water, with end laps of not less than 6 inches (150 mm)staggered 24
inches (600 mm)between courses. Overlap side edges not less than 3-1/2 inches (90
mm). Roll laps with roller. Cover underlayment within 14 days.
3.3 INSTALLATION, GENERAL
A.General: Anchor sheet metal flashing and trim and other components of the Work
securely in place, with provisions for thermal and structural movement. Use fasteners,
solder, welding rods, protective coatings, separators, sealants, and other
miscellaneous items as required to complete sheet metal flashing and trim system.
1.Install sheet metal flashing and trim true to line and levels indicated. Provide
uniform, neat seams with minimum exposure of solder, welds, and sealant.
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076200 SHEET METAL FLASHING AND TRIM
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2.Install sheet metal flashing and trim to fit substrates and to result in watertight
performance. Verify shapes and dimensions of surfaces to be covered before
fabricating sheet metal.
3.Space cleats not more than 12 inches (300 mm)apart. Anchor each cleat with
two fasteners. Bend tabs over fasteners.
4.Install exposed sheet metal flashing and trim without excessive oil canning,
buckling, and tool marks.
5.Install sealant tape where indicated.
6.Torch cutting of sheet metal flashing and trim is not permitted.
7.Do not use graphite pencils to mark metal surfaces.
B.Metal Protection: Where dissimilar metals will contact each other or corrosive
substrates, protect against galvanic action by painting contact surfaces with bituminous
coating or by other permanent separation as recommended by SMACNA.
C.Expansion Provisions: Provide for thermal expansion of exposed flashing and trim.
Space movement joints at a maximum of 20 feet (9 m)with no joints allowed within 24
inches (600 mm)of corner or intersection. Where lapped expansion provisions cannot
be used or would not be sufficiently watertight, form expansion joints of intermeshing
hooked flanges, not less than 1 inch (25 mm)deep, filled with sealant concealed within
joints.
D.Fastener Sizes: Use fasteners of sizes that will penetrate wood sheathing not less
than 1-1/4 inches (32 mm)for nails and not less than 3/4 inch (19 mm)for wood
screws.
E.Seal joints as required for watertight construction.
1.Where sealant-filled joints are used, embed hooked flanges of joint members not
less than 1 inch (25 mm)into sealant. Form joints to completely conceal sealant.
When ambient temperature at time of installation is moderate, between 40 and
70 deg F (4 and 21 deg C), set joint members for 50 percent movement each
way. Adjust setting proportionately for installation at higher ambient
temperatures. Do not install sealant-type joints at temperatures below 40 deg F
(4 deg C).
F.Soldered Joints: Clean surfaces to be soldered, removing oils and foreign matter. Pre-
tin edges of sheets to be soldered to a width of 1-1/2 inches (38 mm), except reduce
pre-tinning where pre-tinned surface would show in completed Work.
1.Do not use torches for soldering. Heat surfaces to receive solder and flow solder
into joint. Fill joint completely. Completely remove flux and spatter from exposed
surfaces.
2.Copper Soldering: Tin edges of uncoated copper sheets using solder for copper.
G.Rivets: Rivet joints are not allowed.
3.4 ROOF FLASHING INSTALLATION
A.General: Install sheet metal flashing and trim to comply with performance
requirements,sheet metal manufacturer's written installation instructions,and
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SMACNA's "Architectural Sheet Metal Manual." Provide concealed fasteners where
possible, set units true to line, and level as indicated. Install work with laps, joints, and
seams that will be permanently watertight and weather resistant.
B.Roof Edge Flashing: Anchor to resist uplift and outward forces according to
recommendations in FMG Loss Prevention Data Sheet 1-49 for specified wind zone
and as indicated. Interlock bottom edge of roof edge flashing with continuous cleat
anchored to substrate at 16-inch (400-mm)centers.Anchor cleats within 6” of outside
corners.
3.5 FLUE PIPE INSTALLATION
A.General: Place flue pipe centered on existing pipe and attach to roof deck with anchor
plate. Stuff space between pipe and flue with fire safing batts 1-inch below top of flue
line. Seal perimeter of pipe with sealant and install rain cap.
3.6 ERECTION TOLERANCES
A.Installation Tolerances: Shim and align sheet metal flashing and trim within installed
tolerance of 1/4 inch in 20 feet (6 mm in 6 m)on slope and location lines as indicated
and within 1/8-inch (3-mm)offset of adjoining faces and of alignment of matching
profiles.
3.7 CLEANING AND PROTECTION
A.Clean exposed metal surfaces of substances that interfere with uniform oxidation and
weathering.
B.Clean and neutralize flux materials. Clean off excess solder.
C.Clean off excess sealants.
D.Replace sheet metal flashing and trim that have been damaged or that have
deteriorated beyond successful repair by finish touchup or similar minor repair
procedures.
END OF SECTION 076200