HomeMy WebLinkAbout07 62 00 Sheet Metal Flashing and Trim.DOCPEDCOR SQUARE; BUILDING 5
07 62 00 -
PEDCOR SQUARE Issue Date 12.18.15 SHEET METAL FLASHING AND TRIM
PEDCOR SQUARE; BUILDING 5
SECTION 07 62 00 - 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. Manufactured Products:
a. Manufactured through-wall flashing and counter flashing.
b. Manufactured reglets and counter flashing.
2. Formed Products:
a. Formed roof drainage sheet metal fabrications.
b. Formed low-slope roof sheet metal fabrications.
c. Formed steep-slope roof sheet metal fabrications.
d. Formed wall sheet metal fabrications.
e. Formed equipment support flashing.
f. Formed overhead-piping safety pans.
B. Related Sections:
1. Division 06 Section "Rough Carpentry" for wood nailers, curbs, and blocking.
2. Division 07 Section "Fiberglass-Reinforced Asphalt Shingles" for installing sheet metal
flashing and trim integral with roofing.
3. Division 07 Section "SBS Modified Bituminous Membrane Roofing" for installing sheet
metal flashing and trim integral with membrane roofing.
4. Division 07 Section "Roof Accessories" for set-on-type curbs, equipment supports, roof
hatches, vents, and other manufactured roof accessory units.
5. Division 07 Section "Expansion Control" for manufactured sheet metal expansion-joint
covers.
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 and copings capable of resisting the following forces
according to recommendations in FMG Loss Prevention Data Sheet 1-49:
1. Wind Zone 1: For velocity pressures of 21 to 30 lbf/sq. ft.: 60-lbf/sq. ft. perimeter uplift
force, 90-lbf/sq. ft. corner uplift force, and 30-lbf/sq. ft. outward force.
C. Thermal Movements: Provide sheet metal flashing and trim that allows for thermal movements
from ambient and surface temperature changes.
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1. Temperature Change (Range): 120 deg F, ambient; 180 deg F, material surfaces.
1.4 ACTION 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, including eaves, ridges, valleys, rakes, crickets, and counter
flashings 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 1-1/2 inches per 12 inches.
C. Samples for Initial Selection: For each type of sheet metal flashing, trim, and accessory
indicated with factory-applied color finishes involving color selection.
D. Samples for Verification: For each type of exposed finish required, prepared on Samples of size
indicated below:
1. Sheet Metal Flashing: 12 inches long by actual width of unit, including finished seam and
in required profile. Include fasteners, cleats, clips, closures, and other attachments.
2. Trim, Metal Closures, Expansion Joints, Joint Intersections, and Miscellaneous
Fabrications: 12 inches long and in required profile. Include fasteners and other
exposed accessories.
3. Accessories and Miscellaneous Materials: Full-size Sample.
4. Anodized Aluminum Samples: Samples to show full range to be expected for each color
required.
1.5 INFORMATIONAL SUBMITTALS
A. Qualification Data: For qualified fabricator.
B. Warranty: Sample of special warranty.
1.6 CLOSEOUT SUBMITTALS
A. Maintenance Data: For sheet metal flashing, trim, and accessories to include in maintenance
manuals.
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1.7 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.
1. Refer also to Specification Section 01 40 00 “Quality Requirements.”
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. Mockups: Build mockups only if requested in writing by Architect, to verify selections made
under sample submittals and to demonstrate aesthetic effects and set quality standards for
fabrication and installation.
1. Build mockup of typical roof eave, including fascia, fascia trim, apron flashing,
approximately 10 feet long, including supporting construction cleats, seams,
attachments, underlayment, and accessories.
2. Approval of mockups does not constitute approval of deviations from the Contract
Documents contained in mockups unless Architect specifically approves such deviations
in writing.
3. Approved mockups may become part of the completed Work if undisturbed at time of
Substantial Completion.
E. Pre-installation 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.
3. Examine substrate conditions for compliance with requirements, including flatness and
attachment to structural members.
4. Review special roof details, roof drainage, roof penetrations, equipment curbs, 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.
1.8 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.
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1.9 WARRANTY
A. Special Warranty on Finishes: Manufacturer's standard form in which manufacturer agrees to
repair finish or replace sheet metal flashing and trim that shows evidence of deterioration of
factory-applied finishes within specified warranty period.
1. Exposed Panel Finish: Deterioration includes, but is not limited to, the following:
a. Color fading more than 5 Hunter units when tested according to ASTM D 2244.
b. Chalking in excess of a No. 8 rating when tested according to ASTM D 4214.
c. Cracking, checking, peeling, or failure of paint to adhere to bare metal.
2. Finish Warranty Period: 20 years from date of Substantial Completion.
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. Non-Patinated Exposed Finish: Mill.
C. Aluminum Sheet: ASTM B 209, alloy as standard with manufacturer for finish required, with
temper as required to suit forming operations and performance required.
1. Surface: Smooth, flat.
2. Exposed Coil-Coated Finishes:
a. Two-Coat Fluoropolymer: AAMA 620. Fluoropolymer finish containing not less
than 70 percent PVDF resin by weight in color coat. Prepare, pretreat, and apply
coating to exposed metal surfaces to comply with coating and resin manufacturers'
written instructions.
3. Color: As selected by Architect from manufacturer's full range.
4. Concealed Finish: Pretreat with manufacturer's standard white or light-colored acrylic or
polyester backer finish, consisting of prime coat and wash coat with a minimum total dry
film thickness of 0.5 mil.
D. Stainless-Steel Sheet: ASTM A 240 or ASTM A 666, Type 304, dead soft, fully annealed.
1. Finish: 2D (dull, cold rolled).
2. Surface: Smooth, flat.
E. Metallic-Coated Steel Sheet: Restricted flatness steel sheet, metallic coated by the hot-dip
process and pre-painted by the coil-coating process to comply with ASTM A 755.
1. Aluminum-Zinc Alloy-Coated Steel Sheet: ASTM A 792, Class AZ50 coating designation,
Grade 40; structural quality.
2. Surface: Smooth, flat.
3. Exposed Coil-Coated Finish:
a. Two-Coat Fluoropolymer: AAMA 621. Fluoropolymer finish containing not less
than 70 percent PVDF resin by weight in color coat. Prepare, pretreat, and apply
coating to exposed metal surfaces to comply with coating and resin manufacturers'
written instructions.
b. Siliconized Polyester: Epoxy primer and silicone-modified, polyester-enamel
topcoat; with a dry film thickness of not less than 0.2 mil for primer and 0.8 mil for
topcoat.
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4. Color: As selected by Architect from manufacturer's full range.
5. Concealed Finish: Pretreat with manufacturer's standard white or light-colored acrylic or
polyester backer finish, consisting of prime coat and wash coat with a minimum total dry
film thickness of 0.5 mil.
2.2 UNDERLAYMENT MATERIALS
A. Self-Adhering, High-Temperature Sheet: Minimum 30 to 40 mils thick, consisting of slip-
resisting polyethylene-film top surface laminated to layer of butyl or SBS-modified asphalt
adhesive, with release-paper backing; cold applied. Provide primer when recommended by
underlayment manufacturer.
1. Thermal Stability: ASTM D 1970; stable after testing at 240 deg F.
2. Low-Temperature Flexibility: ASTM D 1970; passes after testing at minus 20 deg F.
3. Products: Subject to compliance with requirements, provide one of the following:
a. Carlisle Coatings & Waterproofing Inc.; CCW WIP 300HT.
b. Grace Construction Products, a unit of W. R. Grace & Co.; Ultra.
c. Henry Company; Blueskin PE200 HT.
d. Metal-Fab Manufacturing, LLC; MetShield.
e. Owens Corning; WeatherLock Metal High Temperature Underlayment.
B. Slip Sheet: Building paper, 3-lb/100 sq. ft. minimum, rosin sized.
2.3 MISCELLANEOUS MATERIALS
A. General: Provide materials and types of fasteners, 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 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.
2. Fasteners for Copper Sheet: Copper, hardware bronze or Series 300 stainless steel.
3. Fasteners for Aluminum Sheet: Aluminum or Series 300 stainless steel.
4. Fasteners for Stainless-Steel Sheet: Series 300 stainless steel.
5. Fasteners for Aluminum-Zinc Alloy-Coated Steel Sheet: Hot-dip galvanized steel
according to ASTM A 153 or ASTM F 2329 or Series 300 stainless steel.
C. Sealant Tape: Pressure-sensitive, 100 percent solids, gray polyisobutylene compound sealant
tape with release-paper backing. Provide permanently elastic, non-sag, non-toxic, non-staining
tape 1/2 inch wide and 1/8 inch thick.
D. Elastomeric Sealant: ASTM C 920, elastomeric polyurethane or 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.
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E. Epoxy Seam Sealer: Two-part, noncorrosive, aluminum seam-cementing compound,
recommended by aluminum manufacturer for exterior nonmoving joints, including riveted joints.
F. Asphalt Roofing Cement: ASTM D 4586, asbestos free, of consistency required for application.
2.4 MANUFACTURED SHEET METAL FLASHING AND TRIM
A. Through-Wall Ribbed Sheet Metal Flashing: Manufacture through-wall sheet metal flashing for
embedment in masonry with ribs at 3-inch intervals along length of flashing to provide an
integral mortar bond. Manufacture through-wall flashing with snaplock receiver on exterior face
to receive counter flashing.
1. Copper: 10 oz. minimum for fully concealed flashing; 16 oz. elsewhere.
a. Products: Subject to compliance with requirements, provide one of the following:
1) Cheney Flashing Company; Cheney Flashing (Dovetail).
2) Cheney Flashing Company; Cheney Flashing (Sawtooth).
3) Hohmann & Barnard, Inc.; STF Sawtooth Flashing.
4) Keystone Flashing Company, Inc.; Keystone Three-Way Interlocking
Thruwall Flashing.
2. Stainless Steel: 0.016 inch thick.
a. Products: Subject to compliance with requirements, provide one of the following:
1) Cheney Flashing Company; Cheney Flashing (Dovetail).
2) Cheney Flashing Company; Cheney Flashing (Sawtooth).
3) Hohmann & Barnard, Inc.; STF Sawtooth Flashing.
4) Keystone Flashing Company, Inc.; Keystone Three-Way Interlocking
Thruwall Flashing.
B. Reglets: Units of type, material, and profile indicated, formed to provide secure interlocking of
separate reglet and counter flashing pieces, and compatible with flashing indicated with factory-
mitered and -welded corners and junctions and with interlocking counter flashing on exterior
face, of same metal as reglet.
1. Manufacturers: Subject to compliance with requirements, provide products by one of the
following:
a. Cheney Flashing Company.
b. Fry Reglet Corporation.
c. Heckmann Building Products Inc.
d. Hickman, W. P. Company.
e. Hohmann & Barnard, Inc.; STF Sawtooth Flashing.
f. Keystone Flashing Company, Inc.
2. Material: Stainless steel, 0.019 inch thick.
3. Stucco Type: Provide with upturned fastening flange and extension leg of length to
match thickness of applied finish materials.
4. Concrete Type: Provide temporary closure tape to keep reglet free of concrete materials,
special fasteners for attaching reglet to concrete forms, and guides to ensure alignment
of reglet section ends.
5. Masonry Type: Provide with offset top flange for embedment in masonry mortar joint.
6. Accessories:
a. Flexible-Flashing Retainer: Provide resilient plastic or rubber accessory to secure
flexible flashing in reglet where clearance does not permit use of standard metal
counter flashing or where Drawings show reglet without metal counter flashing.
b. Counter flashing Wind-Restraint Clips: Provide clips to be installed before counter
flashing to prevent wind uplift of counter flashing lower edge.
7. Finish: With manufacturer's standard color coating.
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2.5 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.
B. Fabrication Tolerances: Fabricate sheet metal flashing and trim that is capable of installation to
a tolerance of 1/4 inch in 20 feet on slope and location lines as indicated and within 1/8-inch
offset of adjoining faces and of alignment of matching profiles.
C. Sealed Joints: Form non-expansion but movable joints in metal to accommodate elastomeric
sealant.
D. Expansion Provisions: Where lapped expansion provisions cannot be used, form expansion
joints of intermeshing hooked flanges, not less than 1 inch deep, filled with butyl sealant
concealed within joints.
E. Fabricate cleats and attachment devices of sizes as recommended by SMACNA's "Architectural
Sheet Metal Manual" and by FMG Loss Prevention Data Sheet 1-49 for application, but not less
than thickness of metal being secured.
F. Seams: Fabricate non-moving seams with flat-lock seams. Form seams and seal with
elastomeric sealant unless otherwise recommended by sealant manufacturer for intended use.
G. Seams for Aluminum: Fabricate nonmoving seams with flat-lock seams. Form seams and seal
with epoxy seam sealer.
H. Do not use graphite pencils to mark metal surfaces.
2.6 ROOF DRAINAGE SHEET METAL FABRICATIONS
A. Hanging Gutters: Fabricate to cross section indicated, complete with end pieces, outlet tubes,
and other accessories as required. Fabricate in minimum 96-inch- long sections. Furnish flat-
stock gutter spacers and gutter brackets fabricated from same metal as gutters, of size
recommended by SMACNA but not less than twice the gutter thickness. Fabricate expansion
joints, expansion-joint covers, gutter bead reinforcing bars, and gutter accessories from same
metal as gutters.
1. Gutter Style: Refer to Drawings.
2. Expansion Joints: Lap type.
3. Accessories: Valley baffles.
4. Gutters with Girth up to 15 Inches: Fabricate from the following materials:
a. Aluminum: 0.032 inch thick.
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b. Aluminum-Zinc Alloy-Coated Steel: 0.022 inch thick.
B. Downspouts: Fabricate rectangular downspouts complete with mitered elbows. Furnish with
metal hangers, from same material as downspouts, and anchors.
1. Gutter Style: SMACNA Style K standard ogee.
2. Fabricate from the following materials:
a. Aluminum: 0.024 inch thick.
b. Aluminum-Zinc Alloy-Coated Steel: 0.022 inch thick.
C. Parapet Scuppers: Fabricate scuppers of dimensions required with closure flange trim to
exterior, 4-inch- wide wall flanges to interior, and base extending 4 inches beyond cant or
tapered strip into field of roof. Fabricate from the following materials:
1. Aluminum: 0.032 inch thick.
2. Aluminum-Zinc Alloy-Coated Steel: 0.028 inch thick.
D. Conductor Heads: Fabricate conductor heads with flanged back and stiffened top edge and of
dimensions and shape indicated complete with outlet tubes, exterior flange trim, and built-in
overflows. Fabricate from the following materials:
1. Aluminum: 0.032 inch thick.
2. Aluminum-Zinc Alloy-Coated Steel: 0.028 inch thick.
E. Splash Pans: Fabricate from the following materials:
1. Zinc-Tin Alloy-Coated Stainless Steel: 0.018 inch thick.
2.7 LOW-SLOPE ROOF SHEET METAL FABRICATIONS
A. Roof-Edge Flashing Gravel Stop and Fascia Cap: Fabricate in minimum 96-inch- long, but not
exceeding 10-foot- long, sections. Furnish with 6-inch- wide, joint cover plates.
1. Joint Style: Lap, 4 inches wide.
2. Fabricate with scuppers spaced 10 feet apart, of dimensions required with 4-inch- wide
flanges and base extending 4 inches beyond cant or tapered strip into field of roof.
Fasten gravel guard angles to base of scupper.
3. Fabricate from the following materials:
a. Aluminum-Zinc Alloy-Coated Steel: 0.028 inch thick.
B. Copings: Fabricate in minimum 96-inch- long, but not exceeding 10-foot- long, sections.
Fabricate joint plates of same thickness as copings. Furnish with continuous cleats to support
edge of external leg and interior leg. Miter corners, seal, and solder or weld watertight.
1. Coping Profile: Refer to Drawings.
2. Joint Style: Butt, with 12-inch- wide, concealed backup plate.
3. Fabricate from the following materials:
a. Aluminum-Zinc Alloy-Coated Steel: 0.040 inch thick.
C. Roof and Roof to Wall Transition Expansion-Joint Cover: Fabricate from the following materials:
1. Aluminum-Zinc Alloy-Coated Steel: 0.034 inch thick.
D. Base Flashing: Fabricate from the following materials:
1. Copper: 20 oz. /sq. ft.
E. Counter flashing: Fabricate from the following materials:
1. Aluminum-Zinc Alloy-Coated Steel: 0.022 inch thick.
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F. Flashing Receivers: Fabricate from the following materials:
1. Stainless Steel: 0.016 inch thick.
G. Roof-Penetration Flashing: Fabricate from the following materials:
1. Copper: 16 oz. /sq. ft.
H. Roof-Drain Flashing: Fabricate from the following materials:
1. Copper: 12 oz. /sq. ft.
2.8 STEEP-SLOPE ROOF SHEET METAL FABRICATIONS
A. Apron, Step, Cricket, and Backer Flashing: Fabricate from the following materials:
1. Copper: 16 oz. /sq. ft.
2. Aluminum-Zinc Alloy-Coated Steel: 0.022 inch thick.
B. Valley Flashing: Fabricate from the following materials:
1. Copper: 16 oz. /sq. ft.
C. Drip Edges: Fabricate from the following materials:
1. Aluminum-Zinc Alloy-Coated Steel: 0.022 inch thick.
D. Eave, Rake, Ridge, and Hip Flashing: Fabricate from the following materials:
1. Copper: 16 oz. /sq. ft.
2. Aluminum-Zinc Alloy-Coated Steel: 0.022 inch thick.
E. Counter flashing: Fabricate from the following materials:
1. Aluminum-Zinc Alloy-Coated Steel: 0.022 inch thick.
F. Flashing Receivers: Fabricate from the following materials:
1. Stainless Steel: 0.016 inch thick.
G. Roof-Penetration Flashing: Fabricate from the following materials:
1. Copper: 16 oz. /sq. ft.
2.9 WALL SHEET METAL FABRICATIONS
A. Through-Wall Flashing: Fabricate continuous flashings in minimum 96-inch- long, but not
exceeding 12-foot- long, sections, under copings, at shelf angles, and where indicated.
Fabricate discontinuous lintel, sill, and similar flashings to extend 6 inches beyond each side of
wall openings. Form with 2-inch- high, end dams where flashing is discontinuous. Fabricate
from the following materials:
1. Copper: 16 oz. /sq. ft.
B. Opening Flashings in Frame Construction: Fabricate head, sill, jamb, and similar flashings to
extend 4 inches beyond wall openings. Form head and sill flashing with 2-inch- high, end dams.
Fabricate from the following materials:
1. Aluminum-Zinc Alloy-Coated Steel: 0.022 inch thick.
C. Wall Expansion-Joint Cover: Fabricate from the following materials:
1. Copper: 16 oz. /sq. ft.
2. Aluminum-Zinc Alloy-Coated Steel: 0.028 inch thick.
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2.10 MISCELLANEOUS SHEET METAL FABRICATIONS
A. Equipment Support Flashing: Fabricate from the following materials:
1. Copper: 16 oz. /sq. ft.
2. Aluminum-Zinc Alloy-Coated Steel: 0.028 inch thick.
B. Overhead-Piping Safety Pans: Fabricate from the following materials:
1. Galvanized Steel: 0.040 inch thick.
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. 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 staggered 24 inches between courses. Overlap side edges not less than 3-
1/2 inches. 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, 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 welds, and sealant.
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 apart. Anchor each cleat with two fasteners. Bend
tabs over fasteners.
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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.
1. Coat back side of uncoated aluminum and stainless-steel sheet metal flashing and trim
with bituminous coating where flashing and trim will contact wood, ferrous metal, or
cementitious construction.
2. Underlayment: Where installing metal flashing directly on cementitious or wood
substrates, install a course of felt underlayment and cover with a slip sheet.
C. Expansion Provisions: Provide for thermal expansion of exposed flashing and trim. Space
movement joints at a maximum of 10 feet with no joints allowed within 24 inches 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 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 for nails and not less than 3/4 inch for wood screws.
E. Seal joints as shown and as required for watertight construction.
1. Where sealant-filled joints are used, embed hooked flanges of joint members not less
than 1 inch into sealant. Form joints to completely conceal sealant. When ambient
temperature at time of installation is moderate, between 40 and 70 deg F, 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.
2. Prepare joints and apply sealants to comply with requirements in Division 07 Section
"Joint Sealants."
3.4 ROOF DRAINAGE SYSTEM INSTALLATION
A. General: Install sheet metal roof drainage items to produce complete roof drainage system
according to SMACNA recommendations and as indicated. Coordinate installation of roof
perimeter flashing with installation of roof drainage system.
B. Hanging Gutters: Join sections with riveted and soldered joints or with lapped joints sealed with
sealant. Provide for thermal expansion. Attach gutters at eave or fascia to firmly anchored
gutter brackets or straps spaced not more than 36 inches apart. Provide end closures and seal
watertight with sealant. Slope to downspouts.
1. Fasten gutter spacers to front and back of gutter.
2. Loosely lock straps to front gutter bead and anchor to roof deck.
3. Anchor and loosely lock back edge of gutter to continuous cleat.
4. Anchor back of gutter that extends onto roof deck with cleats spaced not more than 24
inches apart.
5. Install gutter with expansion joints at locations indicated, but not exceeding, 50 feet apart.
Install expansion-joint caps.
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C. Downspouts: Join sections with 1-1/2-inch telescoping joints.
1. Provide hangers with fasteners designed to hold downspouts securely to walls. Locate
hangers at top and bottom and at approximately 60 inches o.c. in between.
2. Provide elbows at base of downspout to direct water away from building.
3. Connect downspouts to underground drainage system indicated.
D. Splash Pans: Install where downspouts discharge on low-slope roofs. Set in elastomeric
sealant compatible with roofing membrane.
E. Parapet Scuppers: Install scuppers where indicated through parapet. Continuously support
scupper, set to correct elevation, and seal flanges to interior wall face, over cants or tapered
edge strips, and under roofing membrane.
1. Anchor scupper closure trim flange to exterior wall and seal with elastomeric sealant to
scupper.
2. Loosely lock front edge of scupper with conductor head.
3. Seal with elastomeric sealant exterior wall scupper flanges into back of conductor head.
F. Conductor Heads: Anchor securely to wall with elevation of conductor head rim 1 inch below
scupper discharge.
G. Expansion-Joint Covers: Install expansion-joint covers at locations and of configuration
indicated. Lap joints a minimum of 4 inches in direction of water flow.
3.5 ROOF FLASHING INSTALLATION
A. General: Install sheet metal flashing and trim to comply with performance requirements, sheet
metal manufacturer's written installation instructions, and 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 24-inch
centers.
C. Copings: 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.
1. Interlock exterior bottom edge of coping with continuous cleat anchored to substrate at
24-inch centers.
2. Anchor interior leg of coping with screw fasteners and washers at 24-inch centers.
D. Pipe or Post Counter flashing: Install counter flashing umbrella with close-fitting collar with top
edge flared for elastomeric sealant, extending a minimum of 4 inches over base flashing. Install
stainless-steel draw band and tighten.
E. Counter flashing: Coordinate installation of counter flashing with installation of base flashing.
Insert counter flashing in reglets or receivers and fit tightly to base flashing. Extend counter
flashing 4 inches over base flashing. Lap counter flashing joints a minimum of 4 inches and bed
with sealant. Secure in a waterproof manner by means of snap-in installation and sealant or
lead wedges and sealant.
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F. Roof-Penetration Flashing: Coordinate installation of roof-penetration flashing with installation
of roofing and other items penetrating roof. Seal with elastomeric sealant and clamp flashing to
pipes that penetrate roof.
3.6 WALL FLASHING INSTALLATION
A. General: Install sheet metal wall flashing to intercept and exclude penetrating moisture
according to SMACNA recommendations and as indicated. Coordinate installation of wall
flashing with installation of wall-opening components such as windows, doors, and louvers.
B. Through-Wall Flashing: Installation of through-wall flashing is specified in Division 04 Section
"Unit Masonry” and “Stone Masonry."
C. Reglets: Installation of reglets is specified in Division 03 Section "Cast-in-Place Concrete and
Division 04 Section "Unit Masonry."
D. Opening Flashings in Frame Construction: Install continuous head, sill, and similar flashings to
extend 4 inches beyond wall openings.
3.7 MISCELLANEOUS FLASHING INSTALLATION
A. Overhead-Piping Safety Pans: Suspend pans independent from structure above as indicated
on Drawings. Pipe and install drain line to plumbing waste or drainage system.
B. Equipment Support Flashing: Coordinate installation of equipment support flashing with
installation of roofing and equipment. Weld or seal flashing with elastomeric sealant to
equipment support member.
3.8 ERECTION TOLERANCES
A. Installation Tolerances: Shim and align sheet metal flashing and trim within installed tolerance
of 1/4 inch in 20 feet on slope and location lines as indicated and within 1/8-inch offset of
adjoining faces and of alignment of matching profiles.
3.9 CLEANING AND PROTECTION
A. Clean exposed metal surfaces of substances that interfere with uniform oxidation and
weathering.
B. Clean off excess sealants.
C. Remove temporary protective coverings and strippable films as sheet metal flashing and trim
are installed unless otherwise indicated in manufacturer's written installation instructions. On
completion of installation, remove unused materials and clean finished surfaces. Maintain in a
clean condition during construction.
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.
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END OF SECTION 07 62 00