SOW B190 191 Roof Renovations.pdf

LETC BUILDING 190 and 191 Roof

Renovations

Project Number: 598-23-140

Engineering Planning and Design Office

Central Arkansas Veterans Healthcare System

2200 Fort Roots Drive Building 1

North Little Rock, AR 72114

TABLE OF CONTENTS

1.0 DESCRIPTION OF WORK

2.0 THE SCOPE OF WORK

3.0 GENERAL REQUIREMENTS

4.0 STORMWATER, SEDIMENT EROSION CONTROL, AND ENVIRONMENTAL

5.0 SPECIFICATION

6.0 VA RESPONSIBILITIES

7.0 REVIEW AND COMPLETION SCHEDULE

8.0 VICINITY MAP OF BUILDING 190 AND 191

9.0 PICTURES OF BUILDING 190 AND 191

10.0 SPECIFICATIONS

Building 190 and 191 LETC Roof Renovations

Project No. 598-23-140

1.0 DESCRIPTION OF WORK

1.1 The Central Arkansas Veterans Healthcare System (CAVHS) is in North Little Rock, AR. The Law

Enforcement Training Center (LETC) conducts training on the CAVHS campus In North Little

Rock, AR. LETC occupies several buildings on the campus for administrative offices, training facilities, and dormitories for students.

1.2 The Law Enforcement Training Center (LETC) provides training to VA and DOD law enforcement/ security personnel to enhance the safety of veterans, guests and employees. LETC has experienced a growth in student attendance and anticipates an expansion of students in support of the Secretaries shared services reorganization.

1.3 Building 190 and 191 roofs are in poor condition, numerous shingles are missing or damaged.

New shingles should match or be similar in color to the existing shingles.

1.4 The general contractor (GC) will work with Central Arkansas Healthcare System (CAVHS) staff, Engineering Staff, LETC staff, and other staff as required to collect all information required for design in accordance with the VA’s Technical Information List (TIL), local, state, and federal building codes and standards for facility structure.

1.5 The construction shall be completed in accordance with all appropriate U.S. Department of

Veterans Affairs (VA) standards, specifications, and other Criteria. The VA design information and standards from the VA Office of Construction & Facilities Management can be found on

Internet site http://www.cfm.va.gov Technical Information Library or at Federal Facility Criteria https://www.wbdg.org/ffc/federal-facility-criteria. VA design standards, DOD, and all national, state and local codes adopted and used by the VA shall be adhered to during this project.

2.0 THE SCOPE OF WORK

2.1 Work specific to the design/functionality of the building 190 and 191 roof and roof systems.

2.1.1 GC shall furnish all materials, equipment, and labor to perform all required work as specified.

2.1.2 Remove existing shingles down to the deck and dispose of IAW with applicable regulations.

2.1.3 Repair any damaged decking as necessary.

2.1.4 Install underlayment 30 lb felt, see spec 07 31 13 Asphalt Shingles, Para 2.4

2.1.5 Install new architectural asphalt shingle roof system according to manufacturer’s specifications, uniform dark grey or black color to match other existing buildings at CAVHS, minimum 30-year warranty, see spec 07 31 13

Asphalt Shingles.

2.1.6 Install approximately 20 new flashings around all roof protrusions, see spec 07

60 00 Flashing and Sheet Metal.

2.1.7 Install new gutter on all roof edges without gutter, approximately 1,000 LF.

(Deduct Alternate)

2.1.8 Replace and paint all fascia and soffits around gutter and roof edge, paint and style to match existing. (Deduct Alternate)

2.1.9 Install new 24 gauge color klad metal at gutter edge. (Deduct Alternate)

2.1.10 Install 20-30 new 24 gauge color klad down spouts with downspout at a minimum distance of 20 LF between downspouts. (Deduct Alternate)

2.1.11 Install new drain pipe from downspouts to move water away from building.

(Deduct Alternate)

2.1.12 Install new ridge vent.

2.1.13 Buildings 190 has gutters on the northwest side and building 191 has gutters between 191 and 195. Repair any damage to gutters.

2.1.14 Install any missing screens/covers on vents, pipes, and other roof penetrations.

2.1.15 Remove the lightning protection system (LPS) and reinstall the LSP after completion of roof replacement. Meet VA Spec 26 41 00, NFPA 70, and NFPA

780. Test LPS after reinstallation to insure compliance with UL 96A. Perform repairs as necessary to be in compliance with UL 96A if initial testing is not in compliance. Most recent test report is attached for reference dated: 09 Oct

2.1.16 Remove and clean all debris from job site upon completion.

2.2 Prior to commencement of work, access to installation shall be coordinated with the authorities at the CAVHS Engineering and Safety Department.

2.3 This project also will correct deficiencies as identified in the 2021 VISN 16 Facility Condition

Assessment (FCA), North Little Rock. Gutter portion is to be bid as deduct alternate.

Item FCA Description for Building 7

1 117972 Missing asphalt shingles, patch in approx. 200 sf at various areas. Add gutters and downspouts at all areas. (Bldg. 190)

2 292106 Add gutters and downspouts at all elevations. Fix the 60 lf of gutter that is installed. (Bldg. 191)

3.0 GENERAL REQUIREMENTS

3.1 The contractor shall furnish all labor, provide all necessary materials, tools, equipment, superintendence, transportation, and shall do all that which is necessary to the satisfactory and timely performance in accordance with this Statement of Work (SOW).

3.2 The Contracting Officer Representative (COR) monitors all technical aspects of the contract and assists in contract administration. The COR is authorized to perform the following functions:

assure that the Contractor performs the technical requirements of the contract; perform inspections necessary in connection with contract performance; maintain written and oral communications with the Contractor concerning technical aspects of the contract; issue written interpretations of technical requirements, including Government drawings, designs, specifications; monitor Contractor's performance and notifies both the Contracting Officer and

Contractor of any deficiencies; coordinate availability of government furnished property, and provide site entry of Contractor personnel. The COR is not authorized to change any of the terms and conditions of the resulting order.

3.3 The Veterans Affairs shall not exercise any supervision or control over the “prime contractor’s” sub-contractors performing the tasks herein. Such sub-contractor employees shall be accountable solely to the prime contractor who, in turn shall be responsible to the Veterans

Affairs.

3.4 Quality Control (QC). The contractor shall develop and implement procedures to identify, prevent, and ensure non-recurrence of defective services. The plan shall be submitted to the

COR for review/acceptance prior to starting any work.

3.5 Quality Assurance (QA). The CAVHS Engineers will monitor and inspect the Contractor's performance under this contract using the quality assurance procedures in the Federal

Acquisition Regulation (FAR) clause 52.246-12 and 56.246-13.

3.6 The Contractor shall maintain the following work schedule: Monday through Friday, 7:30 a.m.

through 4:30 p.m., except for listed holidays or when the Government facility is closed due to local or emergencies, administrative closings, or similar Government directed facility closings.

The Contractor may schedule other work hours, as necessary, if mutually agreed upon by the

COR.

3.7 The Contractor shall be responsible for safeguarding all government equipment, information and property provided for Contractor use. At the close of each work period, government facilities, equipment, and materials shall be secured. Contractor will provide sub-contractors only as required to accomplish services and/or products delivery. The Contractor and workforce personnel shall not take photos of Government facilities or activities, unless related to service to be provided. The Contractor shall not post or discuss government facility activities on any unauthorized public access media. Contractor will immediately report suspicious activities to security personnel.

3.8 Work Restrictions: As a Department of Veterans Affairs (VA) facility, all contractor personnel on-site must be US citizens. Some areas of the JLM facility are access controlled and will require velocity badges to access those area. Personnel are required to have a background check and be fingerprinted prior to receiving a velocity badge. The on-site contractor personnel will be issued a badge while on site and shall return their badge to Engineering Services after contract work is completed or when access is no longer needed. Contractors shall be responsible for the cost of lost badges.

3.9 All employees of general contractor and subcontractors shall comply with the VA security management program, be identified by through project and employer badges, and restricted from areas of unauthorized access.

3.10 Do not store materials and equipment in other than assigned areas.

3.11 The Contractor shall do a final cleaning to include disposal of debris resulting from the inspection as well as dispose of containers for the materials used during work performed. The

Contractor shall maintain the work site in a neat, orderly, and safe condition always. The

Contractor shall remove debris daily. The Contractor shall repair any damage to the existing grounds, facilities, or property incurred during the inspection to its original pre-existing conditions. The Contractor shall remove all tools, supplies, equipment, and debris upon completion of the contract. Refer to FAR Clause 36.512 Cleaning Up.

3.12 The Contractor price includes all expenses to include transportation, transaction fees, incidental, mobilization, materials, testing, safety equipment, personal protective equipment, engineering, printing, delivery, all taxes, and all direct and indirect costs including consulting with local, state and federal agencies, as necessary.

3.13 Warranty. Contractor shall warrant its work against faulty workmanship for a period of not less than one year from the date of Government acceptance of the work provided under this contract. Under this warranty, contractor shall be prepared to return to the work site within one working day after notification without charge to make any necessary repairs as a result of faulty workmanship. Provide 30 year roofing warranty certificate.

4.0 STORMWATER, SEDIMENT EROSION CONTROL, AND ENVIRONMENTAL

4.1 Work performed involving environmental aspects must be done in compliance with laws, policies, and guidelines in accordance with CAVHS Green Environmental Management Systems

(GEMS) Program, Waste Management, VA Directive 2004-069, and the Federal Pollution

Prevention Act.

4.2 Since the project required site work on VA, the design shall follow all Federal, Arkansas

Department of Environmental Quality, and Local guidelines in preparing sediment erosion control and stormwater management design.

4.3 The A/E shall research and observe all design guidelines and requirements addressing environmental concerns, including wetlands protection, tree conservation, endangered protection, and others

5.0 SPECIFICATION

5.1 The General Contractor (GC) is responsible for ensuring that the specifications are tailored to the specific requirements of the project and are compatible with the current contract provision.

5.2 Refer to Specifications:

5.2.1 073113 – Asphalt Shingles

5.2.2 076000 – Flashing and Sheet Metal

5.2.3 077100 – Roof Specialties

5.2.4 090600 – Schedule for Finishes

5.2.5 264100 – Facility Lightning Protection

5.2.6 Other referenced specifications as applicable.

6.0 VA RESPONSIBILITIES

6.1 The project construction will be under the supervision of the COR/Project Engineer.

6.2 The VA will administer the contract in respect to negotiations, bidding, and award of the contract.

6.3 The VA shall also conduct the following services: overseeing contractor payrolls, reviewing submittals, review clarification of contract documents, change orders, letters concerning contractor’s performance, time extensions, final inspections, and warranty work.

6.4 Government Documents:

Document No. Date Title

174REJ7 6-23-93 Building 190 – Roof Framing Plan

A201 old wing 6-23-93 Building 190 - Building Elevations

A201 8-1-08 Building 190 – Building Elevations

A202 old wing 6-23-93 Building 190 – Building Elevations

A501 old wing 6-23-93 Building 190 – Roof Plan

A501 8-1-08 Building 190 – Roof Plan

LETCA6 Aug 2006 B190 Roof Plan

2886a201 3-30-01 Building 191 – Building Elevations

2886a501 3-30-01 Building 191 – Roof Plan & Details

200086-EJ3 3-30-01 Building 191 – Roof Framing Plan

7.0 REVIEW AND COMPLETION SCHEDULE

7.1 VA will review all work performed by the GC for compliance with the requirements stated herein, and other requirements which may be identified during the development of the project.

7.2 GC shall provide a work completion schedule; MS project is acceptable.

7.3 Deliverables:

No. Action Within Days After Date of

Contract

Review drawings, regulations, reports, standards, provide clarification, coordinate and hold informal meeting with VA personnel for review of project scope.

3 days

Submit work plan, material submittals.

10 days

Submittal approvals and installation of new roof at building 190 and 191

120 days

Site cleanup, final walk-through, punch-list developed

130 days

Punchlist complete, project completion

150 days

7.4 Period of Performance is 150 days from Notice to Proceed.

7.5 Engineering point of contact is Shane Marriott at joel.marriott@va.gov or at 501-257-1048. Mr.

Marriott is to be contacted for any information concerning this work.

8.0 LOCATION OF BUILDING 190 and 191

Picture 1: Building 190 and 191 Location

9.0 PICTURES OF BUILDING 190 and 191

Picture 2: Front side of Building 190

Picture 3: Back side of Building 190

Picture 4: Back side of Building 191

10.0 SPECIFICATIONS

SECTION 07 31 13

ASPHALT SHINGLES

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes: Fiberglass asphalt shingles over underlayment nailed to roof sheathing.

1.2 RELATED WORK

A. Section 07 60 00, FLASHING AND SHEET METAL: Counterflashing and Flashing of Roof

Projections.

B. Section 07 71 00, ROOF SPECIALTIES: Roof Hatches (Scuttles) and Roof Vents.

C. Section 09 06 00, SCHEDULE FOR FINISHES: Shingle Color.

1.3 APPLICABLE PUBLICATIONS

A. Comply with references to extent specified in this section.

B. ASTM International (ASTM):

D226/D226M-17 ........................ Asphalt-Saturated Organic Felt Used in Roofing and

Waterproofing.

D1970/D1970M-19 .................... Self-Adhering Polymer Modified Bituminous Sheet Materials

Used as Steep Roofing Underlayment for Ice Dam Protection.

D3018/D3018M-11(2017) .......... Class A Asphalt Shingles Surfaced with Mineral Granules.

D3161/D3161M-20 .................... Wind Resistance of Steep Slope Roofing Products (Fan-Induced

Method).

D3462/D3462M-19 .................... Asphalt Shingles Made from Glass Felt and Surfaced with

Mineral Granules.

F1667-18a .................................. Driven Fasteners: Nails, Spikes, and Staples.

C. UL LLC (UL):

790(Edition 8) ............................. Fire Tests of Roof Coverings.

1.4 SUBMITTALS

A. Submittal Procedures: Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

B. Manufacturer's Literature and Data:

1. Description of each product.

2. Installation instructions.

3. Warranty.

C. Samples: Shingles: Full size each type, color and texture.

D. Sustainable Construction Submittals:

1. Solar Reflectance Index (SRI) for asphalt shingles.

1.5 DELIVERY

A. Deliver products in manufacturer's original sealed packaging.

B. Mark packaging, legibly. Indicate manufacturer's name or brand, type, color, production run number, manufacture date, and the label of Underwriters Laboratories.

C. Before installation, return or dispose of products within distorted, damaged, or opened packaging.

1.6 STORAGE AND HANDLING

A. Store shingles according to manufacturer's instructions. Store roll goods on end in upright position.

B. Protect products from damage during handling and construction operations.

C. Keep materials dry, covered completely, and protected from weather.

1.7 WARRANTY

A. Construction Warranty: FAR clause 52.246-21, "Warranty of Construction."

B. Manufacturer's Warranty: Warrant asphalt shingles against material and manufacturing defects.

1. Material Warranty Period: 30 years.

2. Wind-Speed Warranty Period: Resist wind speeds up to 180 km/h (110 mph) (130 mph) for

15 years.

3. Algae-Resistance Warranty Period: No discoloration for 10 years.

PART 2 - PRODUCTS

2.1 PRODUCTS - GENERAL

A. Basis of Design: Section 09 06 00, SCHEDULE FOR FINISHES.

B. Provide each product from one manufacturer.

1. Provide each product exposed to view from one production run.

C. Sustainable Construction Requirements:

1. Asphalt Shingle Recycled Content: // ______ // percent post-consumer recycled content, minimum.

2. Solar Reflectance Index: 29, minimum.

2.2 ASPHALT SHINGLES

A. Asphalt Shingles: Fiberglass reinforced, laminated type, square butt.

1. ASTM D3462/D3462M and ASTM D3018/D3018M, Type I, self-sealing.

2. ASTM D3161/D3161M, Class D or F wind-resistant.

3. UL 790 Class A fire resistance.

4. Minimum Weight: 10.3 kg/square meter (210 lbs./100 square feet).

2.3 ROOFING NAILS

A. ASTM F1667, Type I, Style 20, galvanized steel, deformed shanks, heads 10 mm to 11 mm (3/8 inch to 7/16 inch) diameter.

1. Nails for Shingles: 32 mm (1-1/4 inches) long.

2. Nails for Felt: 19 mm (3/4 inch) long.

2.4 ROOFING UNDERLAYMENT

A. Organic Felt: ASTM D226/D226M, Type l.

B. Self-Adhering Modified Bituminous Underlayment: ASTMD1970/D1970M.

2.5 METAL FLASHING

A. Provide metal roof flashings, including apron flashings, step flashings, valley flashings, drip edges, and vent pipe flashings specified in Section 07 60 00, FLASHING AND SHEET METAL.

2.6 RIDGE VENTS

A. Ridge Vents: Manufacturer's standard ridge vent for use under asphalt shingles.

1. Provide ridge vents with internal filters, internal baffles, or external baffles, for weather protection.

2. Free Area: Minimum 25400 square mm per m (12 square inches per foot).

PART 3 - EXECUTION

3.1 PREPARATION

A. Examine and verify substrate suitability for roofing installation.

1. Verify roof substrates are sound, within manufacturer's tolerances, and free from defects which would interfere with roofing installation.

2. Verify roof accessories, vent pipes and other projections through roof are in place and roof flashing is installed, or ready for installation, before installing shingles.

B. Protect existing construction and completed work from damage.

3.2 INSTALLATION - GENERAL

A. Install products according to manufacturer's instructions and approved submittal drawings.

1. When manufacturer's instructions deviate from specifications, submit proposed resolution for Contracting Officer's Representative consideration.

3.3 METAL DRIP EDGE INSTALLATION

A. At eaves and rakes, install stainless steel drip edges specified in Section 07 60 00, FLASHING AND

SHEET METAL.

1. Eaves: Install metal drip edge before underlayment.

2. Rakes: Install metal drip edge after underlayment.

B. Secure metal drip edges with compatible nails spaced maximum 250 mm (10 inches) on center along inner edges.

3.4 FLASHING INSTALLATION

A. Install metal flashings specified in Section 07 60 00, FLASHING AND SHEET METAL at intersections of roofs, adjoining walls, or projections through deck such as chimneys and vent stacks.

B. Install metal valley flashing shown and as specified under Section 07 60 00, FLASHING AND

SHEET METAL.

1. Secure valley flashing according to shingle manufacturer's instructions.

2. Expose flashing in open portion of valley 125 mm (5 inches) minimum, and lap shingles over flashing 125 mm (5 inches) minimum.

3.5 UNDERLAYMENT INSTALLATION

A. Install self-adhering sheet underlayment, working from low point to high point. Lap sides 90 mm

(3-1/2 inches) minimum, and lap ends 150 mm (6 inches) minimum. Install at the following locations:

1. Eaves and Rakes: From edge of eave and rake to 600 mm (24 inches) minimum beyond inside face of exterior wall.

a. Lap underlayment over eave metal drip edge.

2. Valleys, Hips and Roof Slope Transitions: Centered over change in slope, and extended

450 mm (18 inches) minimum on both sides.

3. Ridges: Centered on ridge and extended 900 mm (36 inches) minimum on both sides. Do not cover ridge vent opening.

4. Sidewalls and Projections through Roof: Extended 450 mm (18 inches) from projection, and extended up projection 100 mm (4 inches) minimum.

5. Firmly roll underlayment to ensure adhesion to roof deck and metal flashings.

B. Install organic felt underlayment on roof deck not covered by self-adhering sheet underlayment, with 100 mm (4 inches) minimum end laps, 50 mm (2 inches) minimum head laps, and 300 mm

(12 inches) minimum ridge laps. Nail felt 125 mm (5 inches) on centers along laps.

3.6 ROOF ACCESSORY INSTALLATION

A. Install roof hatches (scuttles), and roof vents, specified in Section 07 71 00, ROOF SPECIALTIES before installing shingles.

B. Lap underlayment and asphalt shingles over upslope base flanges of roof accessory flashings.

C. Install underlayment and asphalt shingles over side slope base flanges of roof accessory flashings.

D. Install downslope base flanges of roof accessories over asphalt shingles.

3.7 ASPHALT SHINGLE INSTALLATION

A. Install shingles aligned parallel to roof eave, nailed to roof sheathing.

1. Exposure: 125 mm (5 inches) maximum.

2. Head lap: 50 mm (2 inches) minimum.

B. Install asphalt-shingle starter strip with tabs removed and overhanging lower edge of roof

13 mm (1/2 inch).

C. Valleys: // Open // Closed //.

3.8 RIDGE VENT INSTALLATION

A. Install ridge vents over shingles.

1. Extent: Continuous along ridges extending to within <distance> of rakes.

3.9 HIP AND RIDGE SHINGLE INSTALLATION

A. Bend each shingle lengthwise down center to provide equal exposure on both sides of hip and ridge.

1. Begin ridge installation at leeward end of ridge. Cover ridge vents with shingles. Do not cover ridge vent openings with ridge shingles.

2. Begin hip installation at eave.

B. Install shingles with maximum 125 mm (5 inches) exposure.

C. Secure each shingle with one nail on both sides of hip and ridge, 215 mm (8-1/2 inches) back from exposed end and one inch up from edge.

- - E N D - -

SECTION 07 60 00

FLASHING AND SHEET METAL

SPEC WRITER NOTES:

1. Delete or edit text in // // if not applicable to project. Also delete any other paragraph not applicable in the section.

2. This section requires close coordination with roofing and masonry sections for flashing installed by other trades and for flashings integral with manufactured metal roofing/wall systems where matching finish is required of the same material.

3. Coordinate with drawing terminology for correct and uniform nomenclature.

4. Follow the recommendations of the National Roofing Contractors Association "Roofing and Waterproofing Manual" for design criteria.

5. Modify this section to address reroofing of existing roofing system. Coordinate with Section 07 01 50.19 PREPARATION FOR REROOFING for reroofing of existing facilities.

1.1 DESCRIPTION

A. Formed sheet metal work for wall and roof flashing, copings, roof edge metal, fasciae, drainage specialties, and formed expansion joint covers are specified in this section.

1.2 RELATED WORK

SPEC WRITER NOTE: Edit Related Work to reflect other sections relating directly to this section or referenced in this section.

A. Section 07 71 00 ROOF SPECIALTIES: Manufactured flashing, copings, roof edge metal, and fasciae.

B. Section 07 71 00, ROOF SPECIALTIES: Integral flashing components of manufactured roof specialties and accessories or equipment.

C. Section 07 92 00, JOINT SEALANTS: Joint Sealants.

D. Section 09 06 00, SCHEDULE FOR FINISHES: Color of factory coated exterior architectural metal and anodized aluminum items.

E. Section 09 91 00, PAINTING: Paint materials and application.

F. Integral flashing components of manufactured roof specialties and accessories or equipment:

Section 07 71 00, ROOF SPECIALTIES, Section 07 72 00, ROOF ACCESSORIES

G. Division 22, PLUMBING: Integral flashing components of manufactured roof specialties and accessories or equipment.

H. Section 22 14 00, FACILITY STORM DRAINAGE: Flashing of Roof Drains.

I. Division 23 HVAC: Integral flashing components of manufactured roof specialties and accessories or equipment.

1.3 APPLICABLE PUBLICATIONS

A. Publications listed below form a part of this specification to the extent referenced. Publications are referenced in the text by the basic designation only. Editions of applicable publications current on date of issue of bidding documents apply unless otherwise indicated.

B. Aluminum Association (AA):

AA-C22A41 ................................. Aluminum Chemically etched medium matte, with clear anodic coating, Class I Architectural, 0.7-mil thick

AA-C22A42 ................................. Chemically etched medium matte, with integrally colored anodic coating, Class I Architectural, 0.7 mils thick

AA-C22A44 ................................. Chemically etched medium matte with electrolytically deposited metallic compound, integrally colored coating Class I

Architectural, 0.7-mil thick finish

C. American National Standards Institute/Single-Ply Roofing Institute/Factory Mutual

(ANSI/SPRI/FM):

4435/ES-1-11 ............................. Wind Design Standard for Edge Systems Used with Low Slope

Roofing Systems

D. American Architectural Manufacturers Association (AAMA):

AAMA 620-02 ............................. Voluntary Specification for High Performance Organic Coatings on Coil Coated Architectural Aluminum

AAMA 621-02 ............................. Voluntary Specification for High Performance Organic Coatings on Coil Coated Architectural Hot Dipped Galvanized (HDG) and

Zinc-Aluminum Coated Steel Substrates

E. ASTM International (ASTM):

A240/A240M-20 ........................ Standard Specification for Chromium and Chromium-Nickel

Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications.

A653/A653M-20 ........................ Steel Sheet Zinc-Coated (Galvanized) or Zinc Alloy Coated

(Galvanized) by the Hot- Dip Process

B32-08(2014) ............................. Solder Metal

B209-14 ...................................... Aluminum and Aluminum-Alloy Sheet and Plate

B370-12(2019) ........................... Copper Sheet and Strip for Building Construction

D173/D173M-03(2018) .............. Bitumen-Saturated Cotton Fabrics Used in Roofing and

Waterproofing

D412-16 ...................................... Vulcanized Rubber and Thermoplastic Elastomers-Tension

D1187/D1187M-97(2018) .......... Asphalt Base Emulsions for Use as Protective Coatings for Metal

D1784-20 .................................... Rigid Poly (Vinyl Chloride) (PVC) Compounds and Chlorinated

Poly (Vinyl Chloride) (CPVC) Compounds

D3656/D3656M-13 .................... Insect Screening and Louver Cloth Woven from Vinyl-Coated

Glass Yarns

D4586/D4586M-07(2018) .......... Asphalt Roof Cement, Asbestos Free

F. Sheet Metal and Air Conditioning Contractors National Association (SMACNA): Architectural

Sheet Metal Manual.

G. National Association of Architectural Metal Manufacturers (NAAMM):

AMP 500-06 ............................... Metal Finishes Manual

H. Federal Specification (Fed. Spec):

A-A-1925A .................................. Shield, Expansion; (Nail Anchors)

UU-B-790A ................................. Building Paper, Vegetable Fiber

I. International Code Commission (ICC): International Building Code, Current Edition

1.4 PERFORMANCE REQUIREMENTS

SPEC WRITER NOTE: Select applicable subparagraph below based upon FM Approvals 1-28, Table AC 1.4.

Coordinate with uplift requirements of Division 07 roofing section.

A. Wind Uplift Forces: Resist the following forces per FM Approvals 1-49:

1. Wind Zone 1: 1.00 to 1.44 kPa (21 to 30 pound force/square foot): 2.87-kPa (60 pound force/square foot) perimeter uplift force, 4.31-kPa (90 pound force/square foot) corner uplift force, and 1.44-kPa (30 pound force/square foot) outward force.

SPEC WRITER NOTE: Standard below applies to shop-fabricated sheet metal copings and roof edge metal items tested under cited standard; it is a requirement of the current International Building Code. NRCA member firms are able to meet below utilizing NRCA-approved and tested details.

B. Wind Design Standard: Fabricate and install copings, roof-edge flashings tested per

ANSI/SPRI/FM ES-1 to resist design pressure // insert design pressure .

1.5 SUBMITTALS

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

B. Shop Drawings: For all specified items, including:

1. Flashings

2. Copings

3. Gravel Stop-Fascia

4. Gutter and Conductors

5. Expansion joints

6. Fascia-cant

C. Manufacturer's Literature and Data: For all specified items, including:

1. Two-piece counterflashing

2. Thru wall flashing

3. Expansion joint cover, each type

4. Nonreinforced, elastomeric sheeting

5. Copper clad stainless steel

6. Polyethylene coated copper

7. Bituminous coated copper

8. Copper covered paper

9. Fascia-cant

D. Certificates: Indicating compliance with specified finishing requirements, from applicator and contractor.

PART 2 - PRODUCTS

2.1 FLASHING AND SHEET METAL MATERIALS

A. Stainless Steel: ASTM A240, Type 302B, dead soft temper.

B. Copper ASTM B370, cold-rolled temper.

C. Bituminous Coated Copper: Minimum copper ASTM B370, weight not less than 1 kg/m² (3 oz/sf). Bituminous coating shall weigh not less than 2 kg/m² (6 oz/sf); or, copper sheets may be bonded between two layers of coarsely woven bitumen-saturated cotton fabric ASTM D173.

Exposed fabric surface shall be crimped.

D. Polyethylene Coated Copper: Copper sheet ASTM B370, weighing 1 Kg/m² (3 oz/sf) bonded between two layers of (two mil) thick polyethylene sheet.

E. Aluminum Sheet: ASTM B209, alloy 3003-H14 //except alloy used for color anodized aluminum shall be as required to produce specified color. Alloy required to produce specified color shall have the same structural properties as alloy 3003-H14//.

F. Galvanized Sheet: ASTM, A653.

G. Nonreinforced, Elastomeric Sheeting: Elastomeric substances reduced to thermoplastic state and extruded into continuous homogenous sheet (0.056 inch) thick. Sheeting shall have not less than 7 MPa (1,000 psi) tensile strength and not more than seven percent tension-set at 50 percent elongation when tested in accordance with ASTM D412. Sheeting shall show no cracking or flaking when bent through 180 degrees over a 1 mm (1/32 inch) diameter mandrel and then bent at same point over same size mandrel in opposite direction through 360 degrees at temperature of -30°C (-20 °F).

2.2 FLASHING ACCESSORIES

A. Solder: ASTM B32; flux type and alloy composition as required for use with metals to be soldered.

B. Rosin Paper: Fed-Spec. UU-B-790, Type I, Grade D, Style 1b, Rosin-sized sheathing paper, weighing approximately 3 Kg/10 m²( 6 pounds/100 square feet).

C. Bituminous Paint: ASTM D1187, Type I.

D. Fasteners:

1. Use copper, copper alloy, bronze, brass, or stainless steel for copper and copper clad stainless steel, and stainless steel for stainless steel and aluminum alloy. Use galvanized steel or stainless steel for galvanized steel.

2. Nails:

a. Minimum diameter for copper nails: 3 mm (0.109 inch).

b. Minimum diameter for aluminum nails 3 mm (0.105 inch).

c. Minimum diameter for stainless steel nails: 2 mm (0.095 inch) and annular threaded.

d. Length to provide not less than 22 mm (7/8 inch) penetration into anchorage.

3. Rivets: Not less than 3 mm (1/8 inch) diameter.

4. Expansion Shields: Fed Spec A-A-1925A.

E. Sealant: As specified in Section 07 92 00, JOINT SEALANTS for exterior locations.

F. Roof Cement: ASTM D4586.

2.3 SHEET METAL THICKNESS

A. Except as otherwise shown or specified use thickness or weight of sheet metal as follows:

B. Concealed Locations (Built into Construction):

1. Copper: 30g (10 oz) minimum 0.33 mm (0.013 inch thick).

2. Stainless steel: 0.25 mm (0.010 inch) thick.

3. Copper clad stainless steel: 0.25 mm (0.010 inch) thick.

4. Galvanized steel: 0.5 mm (0.021 inch) thick.

C. Exposed Locations:

1. Copper: 0.4 Kg (16 oz).

2. Stainless steel: 0.4 mm (0.015 inch).

3. Copper clad stainless steel: 0.4 mm (0.015 inch).

D. Thickness of aluminum or galvanized steel is specified with each item.

2.4 FABRICATION, GENERAL

A. Jointing:

1. In general, copper, stainless steel, and copper clad stainless steel joints, except expansion and contraction joints, shall be locked and soldered.

2. Jointing of copper over 0.5 Kg (20 oz) weight or stainless steel over 0.45 mm (0.018 inch) thick shall be done by lapping, riveting, and soldering.

3. Joints shall conform to following requirements:

a. Flat-lock joints shall finish not less than 19 mm (3/4 inch) wide.

b. Lap joints subject to stress shall finish not less than 25 mm (one inch) wide and shall be soldered and riveted.

c. Unsoldered lap joints shall finish not less than 100 mm (4 inches) wide.

4. Flat and lap joints shall be made in direction of flow.

5. Edges of bituminous coated copper, copper covered paper, nonreinforced elastomeric sheeting and polyethylene coated copper shall be jointed by lapping not less than 100 mm

(4 inches) in the direction of flow and cementing with asphalt roof cement or sealant as required by the manufacturer's printed instructions.

6. Soldering:

a. Pre tin both mating surfaces with solder for a width not less than 38 mm (1 1/2 inches) of uncoated copper, stainless steel, and copper clad stainless steel.

b. Wire brush to produce a bright surface before soldering lead coated copper.

c. Treat in accordance with metal producers recommendations other sheet metal required to be soldered.

d. Completely remove acid and flux after soldering is completed.

B. Expansion and Contraction Joints:

1. Fabricate in accordance with the Architectural Sheet Metal Manual recommendations for expansion and contraction of sheet metal work in continuous runs.

2. Space joints as shown or as specified.

3. Space expansion and contraction joints for copper, stainless steel, and copper clad stainless steel at intervals not exceeding 7200 mm (24 feet).

4. Space expansion and contraction joints for aluminum at intervals not exceeding 5400 mm

(18 feet), except do not exceed 3000 mm (10 feet) for gravel stops and fascia-cant systems.

5. Fabricate slip-type or loose locked joints and fill with sealant unless otherwise specified.

6. Fabricate joint covers of same thickness material as sheet metal served.

C. Cleats:

1. Fabricate cleats to secure flashings and sheet metal work over 300 mm (12 inches) wide and where specified.

2. Provide cleats for maximum spacing of 300 mm (12 inch) centers unless specified otherwise.

3. Form cleats of same metal and weights or thickness as the sheet metal being installed unless specified otherwise.

4. Fabricate cleats from 50 mm (2 inch) wide strip. Form end with not less than 19 mm (3/4 inch) wide loose lock to item for anchorage. Form other end of length to receive nails free of item to be anchored and end edge to be folded over and cover nail heads.

D. Edge Strips or Continuous Cleats:

1. Fabricate continuous edge strips where shown and specified to secure loose edges of the sheet metal work.

2. Except as otherwise specified, fabricate edge strips or minimum //0.6 Kg (24 ounce) copper// //0.6 mm (0.024 inch) thick stainless steel// //1.25 mm (0.050 inch) thick aluminum//.

3. Use material compatible with sheet metal to be secured by the edge strip.

4. Fabricate in 3000 mm (10 feet) maximum lengths with not less than 19 mm (3/4 inch) loose lock into metal secured by edge strip.

5. Fabricate Strips for fascia anchorage to extend below the supporting wood construction to form a drip and to allow the flashing to be hooked over the lower edge at least 19 mm (3/4-inch).

6. Fabricate anchor edge maximum width of 75 mm (3 inches) or of sufficient width to provide adequate bearing area to insure a rigid installation using //1 Kg (32 oz) copper// //0.8 mm

(0.031 inch) thick stainless steel// //1.6 mm (0.0625 inch) thick aluminum//.

E. Drips:

1. Form drips at lower edge of sheet metal counter-flashings (cap flashings), fascias, gravel stops, wall copings, by folding edge back 13 mm (1/2 inch) and bending out 45 degrees from vertical to carry water away from the wall.

2. Form drip to provide hook to engage cleat or edge strip for fastening for not less than 19 mm (3/4 inch) loose lock where shown.

F. Edges:

1. Edges of flashings concealed in masonry joints opposite drain side shall be turned up 6 mm

(1/4 inch) to form dam, unless otherwise specified or shown otherwise.

2. Finish exposed edges of flashing with a 6 mm (1/4 inch) hem formed by folding edge of flashing back on itself when not hooked to edge strip or cleat. Use 6 mm (1/4 inch) minimum penetration beyond wall face with drip for through-wall flashing exposed edge.

3. All metal roof edges shall meet requirements of IBC, current edition.

G. Metal Options:

1. Where options are permitted for different metals use only one metal throughout.

2. Stainless steel may be used in concealed locations for fasteners of other metals exposed to view.

3. Where copper gravel stops, copings and flashings will carry water onto cast stone, stone, or architectural concrete, or stainless steel.

2.5 FINISHES

A. Use same finish on adjacent metal or components and exposed metal surfaces unless specified or shown otherwise.

B. In accordance with NAAMM Metal Finishes Manual AMP 500, unless otherwise specified.

C. Finish exposed metal surfaces as follows, unless specified otherwise:

1. Copper: Mill finish.

2. Stainless Steel: Finish No. 2B or 2D.

3. Aluminum:

a. Clear Finish: AA-C22A41 medium matte, clear anodic coating, Class 1 Architectural, 18 mm (0.7 mils) thick.

b. Colored Finish: AA-C22A42 (anodized) or AA-C22A44 (electrolytically deposited metallic compound) medium matte, integrally colored coating, Class 1 Architectural, 18 mm (0.7 mils) thick. Dyes will not be accepted.

c. Fluorocarbon Finish: AAMA 620, high performance organic coating.

d. Mill finish.

4. Steel and Galvanized Steel:

a. Finish painted under Section 09 91 00, PAINTING unless specified as prefinished item.

b. Manufacturer's finish:

1) Baked on prime coat over a phosphate coating.

2) Baked-on prime and finish coat over a phosphate coating.

3) Fluorocarbon Finish: AAMA 621, high performance organic coating.

2.6 THROUGH-WALL FLASHINGS

A. Form through-wall flashing to provide a mechanical bond or key against lateral movement in all directions. Install a sheet having 2 mm (1/16 inch) deep transverse channels spaced four to every 25 mm (one inch), or ribbed diagonal pattern, or having other deformation unless specified otherwise.

1. Fabricate in not less than 2400 mm (8 feet) lengths; 3000 mm (10 feet) maximum lengths.

2. Fabricate so keying nests at overlaps.

B. For Masonry Work When Concealed Except for Drip:

1. Either copper, stainless steel, or copper clad stainless steel.

2. Form an integral dam at least 5 mm (3/16 inch) high at back edge.

3. Form exposed portions of flashing with drip, approximately 6 mm (1/4 inch) projection beyond wall face.

C. For Masonry Work When Exposed Edge Forms a Receiver for Counter Flashing:

1. Use same metal and thickness as counter flashing.

2. Form an integral dam at least 5 mm (3/16 inch) high at back edge.

3. Form exposed portion as snap lock receiver for counter flashing upper edge.

D. For Flashing at Architectural Precast Concrete Panels or Stone Panels.

1. Use plan flat sheet of stainless steel.

2. Form exposed portions with drip as specified or receiver.

2.7 BASE FLASHING

A. Use metal base flashing at vertical surfaces intersecting built-up roofing without cant strips or where shown.

1. Use either copper, or stainless steel, thickness specified unless specified otherwise.

2. When flashing is over 250 mm (10 inches) in vertical height or horizontal width use either

0.5 Kg (20 oz) copper or 0.5 mm (0.018 inch) stainless steel.

3. Use stainless steel at aluminum roof curbs where flashing contacts the aluminum.

4. Use either copper, or stainless steel at pipe flashings.

B. Fabricate metal base flashing up vertical surfaces not less than 200 mm (8 inch) nor more than

400 mm (16 inch).

C. Fabricate roof flange not less than 100 mm (4 inches) wide unless shown otherwise. When base flashing length exceeds 2400 mm (8 feet) form flange edge with 13 mm (1/2 inch) hem to receive cleats.

D. Form base flashing bent from strip except pipe flashing. Fabricate ends for riveted soldered lap seam joints. Fabricate expansion joint ends as specified.

E. Pipe Flashing: (Other than engine exhaust or flue stack)

1. Fabricate roof flange not less than 100 mm (4 inches) beyond sleeve on all sides.

2. Extend sleeve up and around pipe and flange out at bottom not less than 13 mm (1/2 inch) and solder to flange and sleeve seam to make watertight.

3. At low pipes 200 mm (8 inch) to 450 mm (18 inch) above roof:

a. Form top of sleeve to turn down into the pipe at least 25 mm (one inch).

b. Allow for loose fit around and into the pipe.

4. At high pipes and pipes with goosenecks or other obstructions which would prevent turning the flashing down into the pipe:

a. Extend sleeve up not less than 300 mm (12 inch) above roofing.

b. Allow for loose fit around pipe.

2.8 COUNTERFLASHING (CAP FLASHING OR HOODS)

A. Either copper or stainless steel, unless specified otherwise.

B. Fabricate to lap base flashing a minimum of 100 mm (4 inches) with drip:

1. Form lock seams for outside corners. Allow for lap joints at ends and inside corners.

2. In general, form flashing in lengths not less than 2400 mm (8 feet) and not more than 3000 mm (10 feet).

3. Two-piece, lock in type flashing may be used in-lieu-of one piece counter-flashing.

4. Manufactured assemblies may be used.

5. Where counterflashing is installed at new work use an integral flange at the top designed to be extended into the masonry joint or reglet in concrete.

6. Where counterflashing is installed at existing work use surface applied type, formed to provide a space for the application of sealant at the top edge.

C. One-piece Counterflashing:

1. Back edge turned up and fabricate to lock into reglet in concrete.

2. Upper edge formed to extend full depth of masonry unit in mortar joint with back edge turned up 6 mm (1/4 inch).

D. Two-Piece Counterflashing:

1. Receiver to extend into masonry wall depth of masonry unit with back edge turned up 6 mm

(1/4 inch) and exposed edge designed to receive and lock counterflashing upper edge when inserted.

2. Counterflashing upper edge designed to snap lock into receiver.

E. Surface Mounted Counterflashing; one or two piece:

1. Use at existing or new surfaces where flashing cannot be inserted in vertical surface.

2. One piece fabricate upper edge folded double for 65 mm (2 1/2 inches) with top 19 mm (3/4 inch) bent out to form "V" joint sealant pocket with vertical surface. Perforate flat double area against vertical surface with horizontally slotted fastener holes at 400 mm (16 inch) centers between end holes. Option: One piece surface mounted counter-flashing (cap flashing) may be used. Fabricate as detailed on Plate 51 of SMACNA Architectural Sheet

Metal Manual.

3. Two pieces: Fabricate upper edge to lock into surface mounted receiver. Fabricate receiver joint sealant pocket on upper edge and lower edge to receive counterflashing, with slotted fastener holes at 400 mm (16 inch) centers between upper and lower edge.

F. Pipe Counterflashing:

1. Form flashing for water-tight umbrella with upper portion against pipe to receive a draw band and upper edge to form a "V" joint sealant receiver approximately 19 mm (3/4 inch) deep.

2. Fabricate 100 mm (4 inch) over lap at end.

3. Fabricate draw band of same metal as counter flashing. Use 0.6 Kg (24 oz) copper or 0.33 mm (0.013 inch) thick stainless steel or copper coated stainless steel.

4. Use stainless steel bolt on draw band tightening assembly.

5. Vent pipe counter flashing may be fabricated to omit draw band and turn down 25 mm (one inch) inside vent pipe.

G. Where vented edge decks intersect vertical surfaces, form in one piece, shape to slope down to a point level with and in front of edge-set notched plank; then, down vertically, overlapping base flashing.

2.9 HANGING GUTTERS

SPEC WRITER NOTE: See Architectural Sheet Metal Manual for minimum thickness of sheet metal and specify. Detail gutter and show size on drawings.

A. Fabricate gutters of not less than the following:

1. //0.4// //0.5// //0.6//Kg (//16// //20// //24// oz) copper.

2. //0.5// //0.6// //0.8//mm (//0.018// //0.025// //0.031// inch) thick stainless steel.

3. //0.6// //0.8// //1.3//mm (//0.025// //0.032// //0.051//inch) thick aluminum.

B. Fabricate hanging gutters in sections not less than 2400 mm (8 feet) long, except at ends of runs where shorter lengths are required.

C. Building side of gutter shall be not less than 38 mm (1 1/2 inches) higher than exterior side.

D. Gutter Bead: Stiffen outer edge of gutter by folding edge over approximately 19 mm (3/4 inch) toward roof and down approximately19 mm (3/4 inch) unless shown otherwise.

E. Gutter Spacers:

1. Fabricate of same material and thickness as gutter.

2. Fabricate 25 mm (one inch) wide strap and fasten to gutters not over 900 mm (36 inches) on center.

3. Turn back edge up 25 mm (one inch) and lap front edge over gutter bead.

4. Rivet and solder to gutter except rivet and seal to aluminum.

F. Outlet Tubes:

1. Form outlet tubes to connect gutters to conductors of same metal and thickness as gutters extend into the conductor 75 mm (3 inch). Flange upper end of outlet tube 13 mm (1/2 inch).

2. Lock and solder longitudinal seam except use sealant in lieu of solder with aluminum.

3. Solder tube to gutter.

4. Fabricate basket strainers of same material as gutters.

G. Gutter Brackets:

1. Fabricate of same metal as gutter. Use the following:

a. //3 by 25 mm (1/8 by 1 inch)// //6 by 25 mm (1/4 by 1 inch)// copper.

b. //3 by 25 mm (1/8 by 1 inch)// //3 by 40 mm (1/8 by 1 1/2 inch)// stainless steel.

c. //5 by 25 mm (3/16 by 1 inch)// //6 by 25 mm (1/4 by 1 inch)// aluminum.

2. Fabricate to gutter profile.

3. Drill two 5 mm (3/16 inch) diameter holes in anchor leg for countersunk flat head screws.

2.10 CONDUCTORS (DOWNSPOUTS)

A. Fabricate conductors of same metal and thickness as gutters in sections approximately 3000 mm

(10 feet) long [with 19 mm (3/4 inch) wide flat locked seams].

1. Fabricate open face channel shape with hemmed longitudinal edges.

B. Fabricate elbows by mitering, riveting, and soldering except seal aluminum in lieu of solder. Lap upper section to the inside of the lower piece.

C. Fabricate conductor brackets or hangers of same material as conductor, 2 mm (1/16 inch) thick by 25 mm (one inch) minimum width. Form to support conductors 25 mm (one inch) from wall surface in accordance with Architectural Sheet Metal Manual for rectangular and round shapes.

D. Conductor Heads:

1. Fabricate of same material as conductor.

2. Fabricate conductor heads to not less than 250 mm (10 inch) wide by 200 mm (8 inch) deep by 200 mm (8 inches) from front to back.

3. Form front and side edges channel shape not less than 13 mm (1/2 inch) wide flanges with edge hemmed.

4. Slope bottom to sleeve to conductor or downspout at not less than 60 degree angle.

5. Extend wall edge not less than 25 mm (one inch) above front edge.

6. Solder joints for water tight assembly.

7. Fabricate outlet tube or sleeve at bottom not less than 50 mm (2 inches) long to insert into conductor.

2.11 SPLASHPANS

A. Fabricate splashpans from the following:

1. 0.4 Kg (16 oz) copper.

2. 0.4 mm (0.015 inch) thick stainless steel.

3. 1.25 mm (0.050 inch) thick aluminum.

B. Fabricate in accordance with Architectural Sheet Metal Manual Plate 35 with not less than two ribs as shown in alternate section.

2.12 REGLETS

A. Fabricate reglets of one of the following materials:

1. 0.4 Kg (16 ounce) copper.

2. Stainless steel, not less than 0.3 mm (0.012 inch) thick.

3. Plastic coated extruded aluminum, not less than 1.4 mm (0.055 inch) thick prefilled with butyl rubber sealer and complete with plastic wedges inserted at 1000 mm (40 inches) on centers.

4. Plastic, ASTM D1784, Type II, not less than 2 mm (0.075 inch) thick.

B. Fill open-type reglets with fiberboard or other suitable separator, to prevent crushing of the slot during installation.

C. Bend edges of reglets for setting into concrete to an angle of not less than 45 degrees, and make wide enough to provide firm anchorage in the concrete.

D. Fabricate reglets for building into horizontal masonry mortar joints not less than 19 mm (3/4 inch) deep, nor more than 25 mm (one inch) deep.

E. Fabricate mitered corners, fittings, and special shapes as may be required by details.

F. Reglets for concrete may be formed to receive flashing and have a 10 mm (3/8 inch), 45 degree snap lock.

2.13 INSULATED EXPANSION JOINT COVERS

A. Either type optional, use only one type throughout.

B. Types:

1. Construct of two preformed, stainless steel strips, not less than 0.4 mm (0.015 inch) thick, mechanically and adhesively bonded to both sides of a 2 mm (1/16 inch) thick neoprene or butyl sheet, or to a 0.4 mm (32 mil) thick reinforced chlorinated polyethylene sheet.

Adhesively attach a 10 mm (3/8 inch) thick sheet of closed cell, neoprene foam insulation, to the underside of the neoprene, butyl, or chlorinated polyethylene sheet.

2. Constructed of a 2 mm (1/16 inch) thick vinyl sheet, flanged at both sides with stainless steel strips not less than 0.4 mm (0.015 inch) thick. Vinyl sheet locked and encased by the stainless steel strip and prepunched for nailing. A 10 mm (3/8 inch) thick closed cell polyvinyl chloride foam insulating strip shall be heat laminated to the underside of the vinyl sheet between the stainless steel strips.

C. Expansion joint covers shall have factory fabricated mitered corners, crossing tees, and other necessary accessories. Furnish in the longest available lengths.

D. Metal flange of sufficient width to extend over the top of the curb and down curb sides 50 mm

(2 inches) with hemmed edge for lock to edge strip.

2.14 ENGINE EXHAUST PIPE OR FLUE OR STACK FLASHING

A. Flashing at penetrations through roofing shall consist of a metal collar, sheet metal flashing sleeve and hood.

B. Fabricate collar with roof flange of 1.2 mm (0.047 inch) minimum thick black iron or galvanized steel sheet.

1. Fabricate inside diameter of collar 100 mm (4 inches) larger than the…