2 - NW-WP9957-21-00021 SOW.pdf

WFO Roof Replacement Projects NWS Weather Forecast Office

WFO Birmingham, AL

Statement of Work for Forecast Office:

17 November 2020

Replace the existing asphalt shingle roof at the National Weather Service (NWS) Forecast Office in Calera AL with a baked enamel standing seam steel metal roof. This roof will replace the existing composition shingle roof and the scope of work includes, but is not limited to: removal of existing shingles, felt, rotted decking as needed, installation of new decking, felt, flashing and edging, caulking and standing seam TPO style metal roof. The required metal roof panel installation is 16” on center seams.

Roof panel color will be selected by the local office staff. All work to be completed in a professional manner according to standard industry practices. Any alteration or deviation from specifications involving additional costs, changes to material, or cosmetic changes will require prior written approval from the National Weather Service. A minimum five-year workmanship warranty and a minimum twenty-year warranty on paint and materials is required as part of the included pricing.

Existing membrane roofing on generator building is almost 30 years old, and has lost its ability to remain waterproof. Additionally, high winds caused by the remnants of Hurricane Zeta have torn away large sections of shingles on the main office building, and created leaks in the generator/storage building.

Work Site:

National Weather Service Forecast Office 465 Weathervane Road Calera, AL 35040

TASK 1 Weather Forecast Office Roof Replacement:

The Contractor shall:

A. Remove existing composition shingles, felt and any rotted decking.

B. Detach lighting rods at ridge and reinstall on metal roof with galvanic insulating pads at terminal bases.

C. Roofing materials must comply with local building codes and have the following requirements:

a. UL 263 Fire Resistant Rating

b. UL2218, Class 4 Hail Resistant Rating

c. UL 580, Class 90, 100 mph Wind Rating

d. ASTM E-1680 Air Penetration Approved

e. ASTM E-1646 Water Infiltration Approved

D. Minimum seam height 1.5” and uniform across the roof

E. Minimum 24-gage panel thickness, 16” seam spacing maximum

F. Steel panels to be factory fabricated or fabricated onsite

G. Steel panels to be painted with Kynar 500, color TBD

H. Install minimum 15 lb. self-adhesive insulation sheets

I. Install decking as needed to replace water damaged sections

J. Install drip edging and z-bar flashing

K. Install 6” seamless aluminum gutters (color to match roof TBD) with 4 downspouts on the full length of the East of the roof

L. Install valley metal (2ea)

M. Install flashing at penetrations.

N. Caulk parapet wall flashing at seams.

TASK 2 Generator Building Roof Replacement:

STATEMENT OF WORK FOR GENERATOR BUILDING:

THERMOPLASTIC POLYOLEFIN (TPO) ROOF SYSTEM

INSTALLATION ON GENERATOR STOREROOM BLDG.

A. General Description and General Requirements:

1. The existing membrane roof on the generator/storeroom building at the NWS Birmingham office has persistently leaked for years. The generator building roof is approximately 400 square feet in size. Roofing has deteriorated with time due to exposure to local environmental elements and use by the National Weather Service. It is recommended that the existing roofs be replaced with a new TPO Roofing System.

B. Scope of Work:

The Contractor shall perform the following work:

1. Roof Demolition:

a. Remove existing EPDM roof systems to metal deck. Remove all felts, insulation, parapet caps, flashing, copings, gutters, and drip edging.

b. Detach existing lighting protection systems from existing EPDM roofs and save for reuse in installing on NFPA code compliant lighting protection system.

2. Repair of Building Steel Roof Decking:

a. Install new decking if needed to replace all existing damaged roof metal decking sections.

b. New decking metal shall match existing metal decking in type and thickness of metal.

c. The Manufacturer of the TPO Roofing System Materials shall inspect the repaired building steel roof decking during construction, to the extent necessary to assure the Manufacturer that they can provide all required Roof Warranties.

3. TPO Roofing System Requirements, Designs, Shop Drawings and Details, and

Construction Requirements:

a. The Contractor shall replace the existing Roofing System at the National Weather Service (NWS) Forecast Office generator building Nashville, TN with a new TPO Roofing System in accordance with the manufacturer’s specifications and recommendations, the approved TPO Roofing System Design and the requirements of this Statement of Work.

b. The Manufacturer of the TPO Roofing System materials shall design the new

TPO Roofing System per the requirements of this Statement of Work. The Manufacturer shall provide Manufacturer's Detailed Designed Drawings and Roof System Installation Details and Instructions for the new TPO Roofing Systems to the Contractor for submission to the Contracting Officer for review and approval.

c. The Contractor shall submit Manufacturer's Detailed Designed Drawings and

Roof System Installation Details and Instructions for the new TPO Roofing Systems to the Contracting Officer representative for review and approval.

4. TPO Roofing System Design Requirements:

a. The Manufacturer of the TPO Roofing System Materials or the Manufacturer’s

Design Representative shall design the new TPO Roofing System to meet or exceed all requirements of this Statement of Work.

b. The TPO Roofing System shall be designed per requirements of IBC, ASCE 7, ASTM-E1592, UL-1897. The minimum IBC Basic Wind Speed (three second gust) is 100 MPH, and the IBC Importance Factor of the Building is 1.15, resulting in a Maximum Design Wind Velocity of 115 MPH.

c. The TPO Roofing System shall be designed to meet LEED 2.2 Cool Roof

Design Requirements with a Solar Roof Index of 78 or better. The TPO roof color shall be light gray.

d. The Manufacturer shall produce all required roof design calculations, design drawings and design drawing details for the complete installation of the new TPO Roofing System.

5. The Manufacturer shall provide all engineering design calculation to substantiate that the TPO Roofing System Design meets all requirements of the specifications and design code requirements.

6. The Manufacturer of the TPO Roofing System Materials shall provide all designs for the new TPO Roofing System to the Contractor for submission to the Contracting Officer for review and approval prior to start of any onsite roof replacement work.

The Contractor shall not commence onsite roof tear off work until the new TPO Roofing System Design has been reviewed and approved by the Contracting Officer Technical Representative.

7. The new TPO Roofing System Design shall include the following work requirements:

a. Provide 'Self Adhesive High Temperature Underlayment' between the rigid insulation and the metal roof deck.

b. Provide new rigid tapered insulation.

c. Provide new metal decking to replace corrosion damaged metal decking as required where necessary.

d. Install the TPO roof system per the manufacturer’s design.

e. Remove and reinstall existing gutters and coping as needed.

f. Provide new flashing and sealant at all roof penetrations.

g. Provide new corrosion resistant valley metal at all location.

i. Provide new corrosion resistant parapet caps, drip edging, flashing, and fascia at all locations. See Metal Decking Allotment, Bid Requirements.

j. Clean and caulk all ridge caps, parapet caps, fascia, coping, trim, and flashing at all seams.

k. Provide corrosion resistant insulation metal fasteners and screws.

8. The Contractor shall have the Manufacturer or their Roof Inspection Representative provide onsite construction inspection of the new TPO Roofing System installation to the extent necessary to assure that the Manufacturer can provide all required Roof Warranties.

9. Galvanic Corrosion Protection: All metal roofing materials, metal fasteners, and metal lightning protection items shall be selected to minimize corrosion by weather, galvanic corrosion, and shall be isolated from all materials that will cause galvanic corrosion.

10. All TPO Roofing System seams shall be sealed or welded to prevent water infiltration per Roofing Manufacturer's specifications and recommendations and with Roofing Manufacturer's specified and recommended equipment and methods.

11. Roof insulation shall be per ASHRAE Standard 189 for LEED Cool Roof Design.

Provide new Rigid Tapered Roof Insulation. The minimum Roof Insulation R-Value shall be R-25.

12. Rigid Tapered Roof Insulation: Provide Polyisocyanurate Rigid Insulation.

Insulation shall be tapered to match the drainage slopes of the existing roof. Mechanically fasten the insulation to the metal roof deck per requirements of the approved roof design by the Manufacturer.

13. Provide 'Self Adhesive High Temperature Underlayment' between the Polyisocyanurate Rigid Insulation and the Metal Roof Deck. The high temperature underlayment shall be Grace HT Self Adhesive Underlayment, or approved equal.

14. Roofing, Metal Item, Painting and Color: Roof Metal Items shall be cleaned, primed and painted with two coats of paint to match, as close as possible, the existing color of the building, The Contractor shall submit Manufacturers Product Information on the Metal Primer and Paint, and shall submit Manufacturers Paint Color Chart to NWS for the Color Selection.

15. Roofing, Metal Item Caulking and Color: Roof caulk materials shall be specified by the Roof Designer and shall be provided where indicated by the Approved Roof System Design Drawings and this Statement of Work.

16. Metal Items to be caulked shall be cleaned prior to caulking. Caulking color shall match color of adjacent surfaced, as close as possible, so as to blend with the color of adjacent surfaced and existing surfaces.

General Requirements for Task 1 and 2:

A. This roof replacement "Scope of Work" shall include; but is not limited to, the following: removal and replacement of existing gutters, parapet caps, copings, felts, insulation, flashings, metal edging, corroded steel roof decking, caulking, and sealing of all metal seams. This will include the removal of the existing roofing system down to the metal decking, plus the design and installation of a new TPO Roofing System. This project may require the removal and replacement of the existing lightning protection system around the roof.

B. The Contractor shall provide all materials, labor, and equipment necessary to remove and dispose of the existing roof system and install a new TPO Roof.

C. The Contractor shall reuse and modify the existing Building Lightning Protection Systems to the extent necessary to be compliant per the NFPA Code Compliant Building Lightning Protection System.

D. All work contained in this Statement of Work shall be completed in a professional and workmanlike manner, per Manufacturers' specifications and requirements and in accordance with roofing industry standards and practices. The installation shall be in accordance with the latest edition of Local, State and Federal Codes identified with the approved (TPO) Roofing System Design and/or Metal Roof System.

E. All work shall comply with the requirements and specifications in this Statement of Work. If there is conflict between requirements within the Statement of Work or the approved TPO Roofing System Design or Metal Roof System, the Contractor shall comply with the most stringent requirement, unless the Contractor, through direct negotiation with the Contracting Officer, receives written approval from the Contracting Officer to comply with the less stringent of the conflicting requirement.

F. All Bidders are encouraged to perform a visit at the project site to inspect the proposed roof replacement building to acquire all necessary site information to properly prepare their Bid Proposal.

G. All alterations or deviations from either this Statement of Work, established specifications or from the approved TPO Roofing System Design that will involve additional costs, changes to material, or cosmetic changes shall require prior written approval from the National Weather Service and the Contracting Officer before they are performed by the Contractor.

H. Provide all rigging needed to remove and replace the roof without damaging any existing buildings or landscaping. Contractor shall be responsible for restoring work site to original condition.

I. Contractor shall coordinate daily work activities and schedule with the Nashville, TN Weather Forecast Office Facilities Engineering Technician (FET), Electronic Systems Analyst (ESA), and the Meteorologist-In-Charge (MIC), so as to not interfere with or disrupt the operations of the National Weather Service.

J. The Davis-Bacon Act applies to all work required to be performed in this Statement of Work. The Contractor shall fully comply with all requirements of the Davis-Bacon Act.

The Contracting Officer will provide the Davis-Bacon Wage Determination documentation to all prospective Bidders.

K. Site Visits shall be scheduled by appointment with: Dan Collis Facilities Engineering Technician (FET) 404-5566274 (C), or email to dan.collis@noaa.gov.

L. Original construction blueprints of the existing building are included in this SOW.

M. Lightning Protection System Requirements, Designs, Shop Drawings and Details, and Construction Requirements:

1. The Contractor shall remove the existing Building Lightning Protection System from the National Weather Service (NWS) Forecast Office and generator building in Peachtree City, GA.

2. The Contractor will reuse and modify the existing Building Lightning

Protection Systems to the extent necessary to bring the existing Lightning Protection Systems up to current NFPA Code requirements. Certification documentation from an Underwriters Laboratories Inc. third party inspector should be submitted to the Contracting Officer verifying that the reinstalled Lightning Protection System has been reinstalled to current NFPA Standards.

(added 6/11/12)

3. The Contractor shall submit Lightning Protection System Shop Drawings, and

Lightning Protection System Installation Details and Instructions to the Contracting Officer for review and approval.

N. Contractor/Roof Installer Qualifications:

mailto:dan.collis@noaa.gov.

1. The Roof Installation Contractor shall have a minimum of five years experience in installing TPO Roofing System Systems and Metal Roofing Systems. The Contractor shall provide written documentation of their qualifications to the Contracting Officer in advance of intended contract award.

2. The Roof Installation Contractor shall be approved by the Manufacturer of the

TPO Roofing System materials as being qualified to install the TPO Roofing System Systems, so that the Manufacturer is able to, and willing to, issue the required Watertight (Water Tightness) Roof Warranty to the Government.

3. The Contractor shall provide to the Contracting Officer written documentation from the manufacturer of his authorization to install the TPO Roofing System and eligibility to obtain the Manufacturer's warranty specified in the following section.

This information shall be submitted prior to the intended contract award.

O. Roof Warrantees:

1. 5 Year Workmanship Warranty by Roof Installation Contractor:

a. The Contractor shall provide, at a minimum, a five year written workmanship/labor warranty, including coverage to building and contents resulting from failure to prevent penetration of water.

2. 20 Year Material and Labor, No Cost, Watertight (Water Tightness)

Warranty by Manufacturer:

a. The Contractor shall, at a minimum, provide a twenty year Manufacturer’s Material and Labor, No Cost to Owner, Watertight (Water Tightness) Warranty.

A written warranty is required.

b. Please note that the roofing material Manufacturer’s Representative must inspect and certify the installation of the TPO Roofing Systems in order for the Manufacturer of the roofing materials to issue the required Manufacturer's Watertight (Water Tightness) Roof Warranty.

P. Submittals: The Contractor shall provide submittals as required by the Statement of Work and on items listed below:

Provide one set of documents for each required submittal. Provide all submittals to the Contracting Officer within 21 calendar days after the issuance of the 'Notice to Proceed' by the Contracting Officer. Note -- The roof design shall be provided to Government for approval after award and prior to start of onsite roof demolition work.

1. Roof Designer Qualifications and Experience.

2. Roof Contractor/Installer Qualifications and Experience.

3. Manufacturer's Engineered Roof Design and all Engineered Roof Design

Calculations to substantiate the entire roof system design.

4. Manufacturer's detailed Roof Design Drawings, Shop Drawings, and

Manufacturer's Roof Installation Details and Instructions.

5. Primer and Paint for metal roofing items.

6. Caulking for metal items.

7. Roof Insulation Material.

8. Roof Insulation Fasteners.

9. Modified base sheet

10. Modified cap FR (Fire Retardant) sheet.

11. Self-Adhesive High Temperature Underlayment.

12. TPO Roofing System Material.

13. Parapet Metal Cap Material.

14. Contractor's Construction Performance Plan and Schedule.

15. New Roof Lightning Protection System Shop Drawings, and Lightning Protection System Installation Details and Instructions.

16. All Required Written Roof Warranties from the Manufacturer and Roof Installation Contractor to be provided after final construction acceptance inspection.

17. Required Construction Permits from local regulatory and code compliance authorities.

Q. Disposal of Construction Debris:

1. Properly remove and dispose of all construction materials and/or demolition debris as required by Local, State, and Federal Regulations.

2. Salvage all recyclable metals and removed roofing materials and deliver metals to a recycle company for proper disposal and salvage.

R. Site Cleanup and Restoration:

1. Contractor shall be responsible for all "Contractor Caused" damage to the worksite and for restoring work site to original condition to the satisfaction of the Contracting Officer Representative.

2. Provide all rigging and equipment needed to remove and replace the roof without causing any damage to existing building, adjacent buildings, sidewalks, asphalt areas, living plants, sprinkler systems, trees, or landscaping.

3. The Contractor shall repair to the satisfaction and approval of the Contracting Officer Representative all Grass Areas, Shrubs, Plants, Sidewalks, Sprinkler Systems, Asphalt Parking Areas, and etc. when damaged by the Contractor during construction.

4. All disputes regarding "Contractor Caused" damage shall be documented in writing and with digital pictures by the Contractor. The Contractor shall send all such documentation to the Contracting Officer for review and final decision.

S. Licenses, Permits, and Fees:

The Contractor shall be responsible for obtaining and paying for all licenses, permits, and fees required for completing all required work. Please note that this is a Federal Government Owned Facility and that all local licenses, permits, and fees are controlled and governed by Public Law 100.

T. Local, State, and Federal, Health and Safety Compliance and Code Compliance:

1. Comply with all Local, State, and Federal environmental, health, and safety regulations while conducting this work.

2. In addition, the Contractor shall ensure that all work is in compliance with all applicable Local, State, and Federal Codes.

U. Safety and Safety Plan:

1. Safety: The Contractor shall observe and institute all applicable OSHA safety requirements and procedures to prevent accidents and injuries to both Contractor and Government employees and shall comply with 40 CFR 1926 Subpart M for fall protection requirements for all workers on this project.

2. The Contractor shall designate one person as Safety Coordinator for purposes of communication between the Contractor and the National Weather Service. The Primary Contact shall be Dan Collis of the National Weather Service, phone # 678- 488-8688.

3. The Contractor shall not be allowed to flame torch cut any metals upon or within the roof structure of the building.

V. IT Security Note:

1. Certification and Accreditation (C&A) requirements do not apply, and a Security Accreditation Package is not required.

END OF STATEMENT OF WORK

J. The Davis-Bacon Act applies to all work required to be performed in this Statement of Work. The Contractor shall fully comply with all requirements of the Davis-Bacon Act. The Contracting Officer will provide the Davis-Bacon Wage Determination doc...