B09_Attachment_34_-_07_62_00_-_Sheet_Metal_Flashing_and_Trim_0007.pdf
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- 140P2024R0114
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This document is a section from the specifications for sheet metal flashing and trim to be used in the HAVO 305150 Phase II project at Hawaii Volcanoes National Park. The key details are:
The sheet metal flashing and trim must be custom-fabricated to comply with the design, dimensions, metal thickness, and other requirements specified. Prefinished aluminum is required for flashing associated with the roofing system, and Type 304 stainless steel painted is required for gutters, leaders, and downspouts. The installation must result in a watertight, weather-resistant system that can withstand wind loads, structural movement, and thermal expansion. Specific requirements are provided for seams, joints, fasteners, and expansion provisions. The contractor must examine the substrates, verify compliance with installation tolerances, and correct any unsatisfactory conditions prior to installation. The work must be installed in accordance with the manufacturer's instructions and the cited sheet metal standard.
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HAVO – 305150B 07 62 00- 1
081324 SHEET METAL FLASHING AND TRIM
SECTION 07 62 00 – SHEET METAL FLASHING AND TRIM
PART 1 - GENERAL
1.1 COORDINATION
A. Coordinate sheet metal flashing and trim layout and seams with sizes and locations of penetrations to be flashed, and joints and seams in adjacent materials.
B. Coordinate sheet metal flashing and trim installation with adjoining roofing and wall materials, joints, and seams to provide leakproof, secure, and noncorrosive installation.
1.2 SUBMITTALS
A. Shop Drawings
B. Material samples, minimum 6 inches by 6 inches.
1.3 DELIVERY, STORAGE, AND HANDLING
A. Do not store prefinished sheet metal flashing and trim materials in contact with other materials that might cause staining, denting, or other surface damage.
1. Store sheet metal flashing and trim materials away from uncured concrete and masonry.
2. Protect stored sheet metal flashing and trim from contact with water.
B. Protect strippable protective covering on sheet metal flashing and trim from exposure to sunlight and high humidity, except to extent necessary for period of sheet metal flashing and trim installation.
1.4 PERFORMANCE REQUIREMENTS
A. Sheet metal flashing and trim assemblies, including cleats, anchors, and fasteners, are to 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 are not to rattle, leak, or loosen, and are to remain watertight.
B. Sheet Metal Standard for Flashing and Trim: Comply with SMACNA's "Architectural Sheet Metal Manual" requirements for dimensions and profiles shown unless more stringent requirements are indicated.
C. Thermal Movements: Allow for thermal movements from ambient and surface temperature changes to prevent buckling, opening of joints, overstressing of components, failure of joint sealants, failure of connections, and other detrimental effects. Base calculations on surface temperatures of materials due to both solar heat gain and nighttime-sky heat loss.
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HAVO – 305150B 07 62 00- 2
1. Temperature Change: 120 deg F, ambient; 180 deg F, material surfaces.
1.5 FABRICATION
A. General
1. Custom-fabricate sheet metal flashing and trim to comply with details indicated and recommendations in cited sheet metal standard that apply to design, dimensions, geometry, metal thickness, and other characteristics of item required.
a. Fabricate sheet metal flashing and trim in shop to greatest extent possible.
b. 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.
c. Verify shapes and dimensions of surfaces to be covered and obtain field measurements for accurate fit before shop fabrication.
d. Form sheet metal flashing and trim to fit substrates without excessive oil-canning, buckling, and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems.
e. Conceal fasteners and expansion provisions where possible. Do not use exposed fasteners on faces exposed to view.
B. Fabrication Tolerances
1. 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 indicated on Drawings and within 1/8-inch offset of adjoining faces and of alignment of matching profiles.
2. Fabricate sheet metal flashing and trim that is capable of installation to tolerances specified.
C. Expansion Provisions: Form metal for thermal expansion of exposed flashing and trim.
1. Form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with butyl sealant concealed within joints.
2. Use lapped expansion joints only where indicated on Drawings.
D. Sealant Joints: Where movable, non-expansion-type joints are required, form metal in accordance with cited sheet metal standard to provide for proper installation of elastomeric sealant.
E. Fabricate cleats and attachment devices from same material as accessory being anchored or from compatible, noncorrosive metal.
F. Seams:
1. Fabricate nonmoving seams with flat-lock seams. Form seams and seal with elastomeric sealant unless otherwise recommended by sealant manufacturer for intended use. Rivet joints where necessary for strength.
G. Do not use graphite pencils to mark metal surfaces.
PART 2 - PRODUCTS
HAVO – 305150B 07 62 00- 3
2.1 MATERIALS
A. All flashing associated with the roofing system
1. Prefinished aluminum to match roofing color and finish.
B. All gutters, leaders, and downspouts
1. Type 304 stainless steel painted in accordance with Section 09 91 13.
PART 3 - EXECUTION
3.1 EXAMINATION
A. Examine substrates, areas, and conditions, with installer present, for compliance with requirements for installation tolerances, substrate, 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.
3. Verify that air- or water-resistant barriers have been installed over sheathing or backing substrate to prevent air infiltration or water penetration.
B. Proceed with installation only after unsatisfactory conditions have been corrected.
3.2 INSTALLATION
A. General
1. Install sheet metal flashing and trim to comply with details indicated and recommendations of cited sheet metal standard that apply to installation characteristics required unless otherwise indicated on Drawings.
a. Install fasteners, protective coatings, separators, sealants, and other miscellaneous items as required to complete sheet metal flashing and trim system.
b. Install sheet metal flashing and trim true to line, levels, and slopes. Provide uniform, neat seams with minimum exposure of welds or sealant.
c. Anchor sheet metal flashing and trim and other components of the Work securely in place, with provisions for thermal and structural movement.
d. Install sheet metal flashing and trim to fit substrates and to result in watertight performance.
e. Space individual cleats not more than 12 inches apart. Attach each cleat with at least two fasteners. Bend tabs over fasteners.
f. Install exposed sheet metal flashing and trim with limited oil-canning, and free of buckling and tool marks.
g. Do not field cut sheet metal flashing and trim by torch.
h. Do not use graphite pencils to mark metal surfaces.
HAVO – 305150B 07 62 00- 4
2. Metal Protection: Where dissimilar metals contact each other, or where metal contacts pressure-treated wood or other corrosive substrates, protect against galvanic action or corrosion by painting contact surfaces with bituminous coating or by other permanent separation as recommended by sheet metal manufacturer or cited sheet metal standard.
a. Coat concealed side of stainless steel sheet metal flashing and trim with bituminous coating where flashing and trim contact wood, ferrous metal, or cementitious construction.
b. Underlayment: Where installing sheet metal flashing and trim directly on cementitious or wood substrates, install underlayment and cover with slip sheet.
3. Expansion Provisions: Provide for thermal expansion of exposed flashing and trim.
a. Space movement joints at maximum of 10 feet with no joints within 24 inches of corner or intersection.
b. Form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with sealant concealed within joints.
c. Use lapped expansion joints only where indicated on Drawings.
d. Conceal fasteners and expansion provisions where possible in exposed work and locate to minimize possibility of leakage. Cover and seal fasteners and anchors as required for a tight installation.
4. Seal joints as required for watertight construction.
a. Use sealant-filled joints unless otherwise indicated.
1) Embed hooked flanges of joint members not less than 1 inch into sealant.
2) Form joints to completely conceal sealant.
3) When ambient temperature at time of installation is between 40 and 70 deg F, set joint members for 50 percent movement each way.
4) Adjust setting proportionately for installation at higher ambient temperatures.
a) Do not install sealant-type joints at temperatures below 40 deg F.
b. Prepare joints and apply sealants to comply with requirements in Section 07 92 00 "Joint Sealants."
5. Rivets: Rivet joints in where necessary for strength.
B. Installation of Roof-Drainage System
1. Install sheet metal roof-drainage items to produce complete roof-drainage system in accordance with cited sheet metal standard unless otherwise indicated. Coordinate installation of roof perimeter flashing with installation of roof-drainage system.
C. Installation of Roof Flashings
1. Install sheet metal flashing and trim to comply with performance requirements, sheet metal manufacturer's written installation instructions, and cited sheet metal standard.
HAVO – 305150B 07 62 00- 5
a. Provide concealed fasteners where possible, and set units true to line, levels, and slopes.
b. Install work with laps, joints, and seams that are permanently watertight and weather resistant.
2. Roof Edge Flashing:
a. Install roof edge flashings in accordance with ANSI/SPRI/FM 4435/ES-1.
b. Anchor to resist uplift and outward forces in accordance with recommendations in cited sheet metal standard unless otherwise indicated. Interlock bottom edge of roof edge flashing with continuous cleat anchored to substrate at staggered 3-inch centers.
c. Anchor to resist uplift and outward forces in accordance with recommendations in FM Global Property Loss Prevention Data Sheet 1-49 for FM Approvals' listing for required windstorm classification.
D. Installation Tolerances
1. 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 indicated on Drawings and within 1/8-inch offset of adjoining faces and of alignment of matching profiles.
3.3 CLEANING
A. Clean off excess sealants.
3.4 PROTECTION
A. Remove temporary protective coverings and strippable films as sheet metal flashing and trim are installed unless otherwise indicated in manufacturer's written installation instructions.
B. On completion of sheet metal flashing and trim installation, remove unused materials and clean finished surfaces as recommended in writing by sheet metal flashing and trim manufacturer.
C. Maintain sheet metal flashing and trim in 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, as determined by Contracting Officer.
END OF SECTION 07 62 00
| PART 1 - GENERAL |
| 1.1 Coordination |
| A. Coordinate sheet metal flashing and trim layout and seams with sizes and locations of penetrations to be flashed, and joints and seams in adjacent materials. |
| B. Coordinate sheet metal flashing and trim installation with adjoining roofing and wall materials, joints, and seams to provide leakproof, secure, and noncorrosive installation. |
| 1.2 SUBMITTALS |
| A. Shop Drawings |
| B. Material samples, minimum 6 inches by 6 inches. |
| 1.3 DELIVERY, STORAGE, AND HANDLING |
| A. Do not store prefinished sheet metal flashing and trim materials in contact with other materials that might cause staining, denting, or other surface damage. |
| 1. Store sheet metal flashing and trim materials away from uncured concrete and masonry. |
| 2. Protect stored sheet metal flashing and trim from contact with water. |
B. Protect strippable protective covering on sheet metal flashing and trim from exposure to sunlight and high humidity, except to extent necessary for period of sheet metal flashing and trim installation.
| 1.4 Performance Requirements |
| A. Sheet metal flashing and trim assemblies, including cleats, anchors, and fasteners, are to withstand wind loads, structural movement, thermally induced movement, and exposure to weather without failure due to defective manufacture, fabrication, ins... |
| B. Sheet Metal Standard for Flashing and Trim: Comply with SMACNA's "Architectural Sheet Metal Manual" requirements for dimensions and profiles shown unless more stringent requirements are indicated. |
| C. Thermal Movements: Allow for thermal movements from ambient and surface temperature changes to prevent buckling, opening of joints, overstressing of components, failure of joint sealants, failure of connections, and other detrimental effects. Base ... |
| 1. Temperature Change: 120 deg F, ambient; 180 deg F, material surfaces. |
| 1.5 Fabrication |
| A. General |
| 1. Custom-fabricate sheet metal flashing and trim to comply with details indicated and recommendations in cited sheet metal standard that apply to design, dimensions, geometry, metal thickness, and other characteristics of item required. |
| a. Fabricate sheet metal flashing and trim in shop to greatest extent possible. |
| b. 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. |
| c. Verify shapes and dimensions of surfaces to be covered and obtain field measurements for accurate fit before shop fabrication. |
| d. Form sheet metal flashing and trim to fit substrates without excessive oil-canning, buckling, and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems. |
| e. Conceal fasteners and expansion provisions where possible. Do not use exposed fasteners on faces exposed to view. |
| B. Fabrication Tolerances |
| 1. 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 indicated on Drawings and within 1/8-inch offset of adjoining faces and of alignment of matching profiles. |
| 2. Fabricate sheet metal flashing and trim that is capable of installation to tolerances specified. |
| C. Expansion Provisions: Form metal for thermal expansion of exposed flashing and trim. |
| 1. Form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with butyl sealant concealed within joints. |
| 2. Use lapped expansion joints only where indicated on Drawings. |
| D. Sealant Joints: Where movable, non-expansion-type joints are required, form metal in accordance with cited sheet metal standard to provide for proper installation of elastomeric sealant. |
| E. Fabricate cleats and attachment devices from same material as accessory being anchored or from compatible, noncorrosive metal. |
| F. Seams: |
| 1. Fabricate nonmoving seams with flat-lock seams. Form seams and seal with elastomeric sealant unless otherwise recommended by sealant manufacturer for intended use. Rivet joints where necessary for strength. |
G. Do not use graphite pencils to mark metal surfaces.
| PART 2 - PRODUCTS |
| 2.1 MATERIALS |
| A. All flashing associated with the roofing system |
| 1. Prefinished aluminum to match roofing color and finish. |
| B. All gutters, leaders, and downspouts |
| 1. Type 304 stainless steel painted in accordance with Section 09 91 13. |
| PART 3 - EXECUTION |
| 3.1 EXAMINATION |
| A. Examine substrates, areas, and conditions, with installer present, for compliance with requirements for installation tolerances, substrate, 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. |
| 3. Verify that air- or water-resistant barriers have been installed over sheathing or backing substrate to prevent air infiltration or water penetration. |
B. Proceed with installation only after unsatisfactory conditions have been corrected.
| 3.2 INSTALLATION |
| A. General |
| 1. Install sheet metal flashing and trim to comply with details indicated and recommendations of cited sheet metal standard that apply to installation characteristics required unless otherwise indicated on Drawings. |
| a. Install fasteners, protective coatings, separators, sealants, and other miscellaneous items as required to complete sheet metal flashing and trim system. |
| b. Install sheet metal flashing and trim true to line, levels, and slopes. Provide uniform, neat seams with minimum exposure of welds or sealant. |
| c. Anchor sheet metal flashing and trim and other components of the Work securely in place, with provisions for thermal and structural movement. |
| d. Install sheet metal flashing and trim to fit substrates and to result in watertight performance. |
| e. Space individual cleats not more than 12 inches apart. Attach each cleat with at least two fasteners. Bend tabs over fasteners. |
| f. Install exposed sheet metal flashing and trim with limited oil-canning, and free of buckling and tool marks. |
| g. Do not field cut sheet metal flashing and trim by torch. |
| h. Do not use graphite pencils to mark metal surfaces. |
| 2. Metal Protection: Where dissimilar metals contact each other, or where metal contacts pressure-treated wood or other corrosive substrates, protect against galvanic action or corrosion by painting contact surfaces with bituminous coating or by other... |
| a. Coat concealed side of stainless steel sheet metal flashing and trim with bituminous coating where flashing and trim contact wood, ferrous metal, or cementitious construction. |
| b. Underlayment: Where installing sheet metal flashing and trim directly on cementitious or wood substrates, install underlayment and cover with slip sheet. |
| 3. Expansion Provisions: Provide for thermal expansion of exposed flashing and trim. |
| a. Space movement joints at maximum of 10 feet with no joints within 24 inches of corner or intersection. |
| b. Form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with sealant concealed within joints. |
| c. Use lapped expansion joints only where indicated on Drawings. |
| d. Conceal fasteners and expansion provisions where possible in exposed work and locate to minimize possibility of leakage. Cover and seal fasteners and anchors as required for a tight installation. |
| 4. Seal joints as required for watertight construction. |
| a. Use sealant-filled joints unless otherwise indicated. |
| 1) Embed hooked flanges of joint members not less than 1 inch into sealant. |
| 2) Form joints to completely conceal sealant. |
| 3) When ambient temperature at time of installation is between 40 and 70 deg F, set joint members for 50 percent movement each way. |
| 4) Adjust setting proportionately for installation at higher ambient temperatures. |
| a) Do not install sealant-type joints at temperatures below 40 deg F. |
b. Prepare joints and apply sealants to comply with requirements in Section 07 92 00 "Joint Sealants."
5. Rivets: Rivet joints in where necessary for strength.
| B. Installation of Roof-Drainage System |
| 1. Install sheet metal roof-drainage items to produce complete roof-drainage system in accordance with cited sheet metal standard unless otherwise indicated. Coordinate installation of roof perimeter flashing with installation of roof-drainage system. |
| C. Installation of Roof Flashings |
| 1. Install sheet metal flashing and trim to comply with performance requirements, sheet metal manufacturer's written installation instructions, and cited sheet metal standard. |
| a. Provide concealed fasteners where possible, and set units true to line, levels, and slopes. |
| b. Install work with laps, joints, and seams that are permanently watertight and weather resistant. |
| 2. Roof Edge Flashing: |
| a. Install roof edge flashings in accordance with ANSI/SPRI/FM 4435/ES-1. |
| b. Anchor to resist uplift and outward forces in accordance with recommendations in cited sheet metal standard unless otherwise indicated. Interlock bottom edge of roof edge flashing with continuous cleat anchored to substrate at staggered 3-inch cent... |
| c. Anchor to resist uplift and outward forces in accordance with recommendations in FM Global Property Loss Prevention Data Sheet 1-49 for FM Approvals' listing for required windstorm classification. |
| D. Installation Tolerances |
| 1. 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 indicated on Drawings and within 1/8-inch offset of adjoining faces and of alignment of matching pro... |
| 3.3 CLEANING |
| A. Clean off excess sealants. |
| 3.4 PROTECTION |
| A. Remove temporary protective coverings and strippable films as sheet metal flashing and trim are installed unless otherwise indicated in manufacturer's written installation instructions. |
| B. On completion of sheet metal flashing and trim installation, remove unused materials and clean finished surfaces as recommended in writing by sheet metal flashing and trim manufacturer. |
| C. Maintain sheet metal flashing and trim in 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, as determined by Contracting Officer. |
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