A04 PEFO_Replace Roofs_Statement of Work r1.pdf

REPLACE MEMBRANE ROOFS ON HOUSING BLOCK A, HOUSING BLOCK C AND RAINBOW FOREST

MUSEUM

Petrified Forest National Park, Division of Facility Management

Statement of Work

1. Project Introduction

a. Location – Housing Blocks A and C, and the Rainbow Forest Museum are located within the boundaries of the Petrified Forest National Park, located in northeastern Arizona, approximately 50 miles from the New Mexico border on Interstate 40. The park stretches north and south between Interstate 40 and U.S. Highway 180.

i. Housing Blocks A and C are in the Painted Desert Community Complex at the northern entrance to the park off Interstate 40, Exit 311.

ii. Rainbow Forest Museum is located 2 miles north of the southern entrance to the park off U. S. Highway 180, milepost 324.

b. Description – The contractor shall install new membrane roofing material as specified in this document. All work on this contract shall be done in compliance with the Secretary of the Interiors Standards for Historic Preservation.

i. Housing Block A consists of three individual and connected apartments under one roof. The roof area measures approximately 6,800 square feet.

ii. Housing Block C consists of six individual and connected apartments under one roof. The roof area measures approximately 12,900 square feet.

iii. Rainbow Forest Museum consists of one multi-level roof system. The roof area measures approximately 3,500 square feet. The existing roof system will be removed and replaced as specified.

c. Points of Contact

i. Contracting Officer (CO)

Deborah Cimmer

Arizona Major Acquisition Buying Office

1824 South Thompson Street, Suite 200

Flagstaff, Arizona 86001

ii. Contracting Officer Representative (COR) TBD

Petrified Forest National Park

One Park Road

Petrified Forest, Arizona 86028

iii. Facility Manager

Petrified Forest National Park

One Park Road

Petrified Forest, Arizona 86028

2. General Requirements – This contract shall provide for the following work:

a. The installation of new membrane roofing of the Painted Desert Community Complex

Housing Blocks A and C with the following requirements.

i. A PVC thermoplastic membrane replacement, 50 mil in thickness, white in color, attached with mechanical fasteners.

ii. A slip sheet that is 3.5 mil in thickness and attached with mechanical fasteners.

iii. Single Ply Thermoplastic Polyolefin (TPO) roofing

iv. Plywood roof deck of 5/8 inch when damaged decking is identified.

v. Two piece metal edge compression on perimeter and around atrium edges.

vi. Furnish and install internal drain boots and compression ring assemblies into existing drains.

vii. Encapsulate all mid deck fire walls with prefabricated expansion joint flashings.

viii. Furnish and install 24 new heat welded walk pads with two each per serviceable

HVAC unit and as protection under blocking on roof.

ix. New Roof system must include a manufacturer’s 20 year NDL (No Dollar Limit)

Warranty with the first 15 years also including consequential damages coverage.

x. The new roof system must also be secured in such a manner as to provide for wind resistance up to 90 mph wind gusts.

xi. The warranty and factory inspection are to be completed at no cost to the owner.

b. The removal and replacement of built-up roofing and underlayment of the Rainbow

Forest Museum with the following requirements:

i. The demolition of existing built-up roofing material, insulation, flashing, soffits, fascia, drip edges, and all other associated materials and disposal.

ii. Repair/replace damaged decking prior to installing new roofing system.

iii. Replace rain gutters and downspouts with aluminum seamless gutters.

iv. Replace vent caps, fascia cover, and drip guard.

v. Repair of parapet wall and existing roof drainage canals.

vi. New roofing system shall include:

1. Polyisocyanurate board insulation

2. Insulation cover board

3. Vapor barrier fully adhered

4. Underlayment fully adhered

5. Single ply TPO

6. Flashings

7. Other materials and accessories required to provide a finished and complete system.

vii. Roof system to slope minimum ¼ inch for every 12 inches towards existing roof drains.

viii. Re-flash skylights, build-up skylight curbs, vent pipes, drains, scuppers, and exhaust fan to match existing.

ix. Furnish and install new heat welded walk pads with two each per serviceable

HVAC unit and as protection under blocking on roof.

x. New Roof system must include a manufacturer’s 20-year NDL (No Dollar Limit)

Warranty with the first 15 years also including consequential damages coverage.

xi. The new roof system must also be secured in such a manner as to provide for wind resistance up to 90 mph wind gusts.

xii. The warranty and factory inspection are to be completed at no cost to the owner.

3. Specifications

a. ROOF INCLUDES

i. Overlay Single-Ply: TPO

ii. PVC thermoplastic membrane attached with mechanical fasteners.

iii. Slip sheet, attached with mechanical fasteners.

iv. Prefabricated flashings, corners, parapets, stacks, vents, and related details.

v. Fasteners, adhesives, and other accessories required for a complete roofing installation.

vi. Traffic Protection

b. REFERENCES

i. NRCA - The NRCA Roofing and Waterproofing Manual

ii. ASCE 7 - Minimum Design Loads For Buildings And Other Structures

iii. UL - Roofing Materials and Systems Directory, Roofing Systems (TGFU.R10128)

iv. ASTM C 1289 - Standard Specification for Faced Rigid Cellular Polyisocyanurate

Thermal Insulation Board

v. ASTM D 751 - Standard Test Methods for Coated Fabrics

vi. ASTM D 4434 - Standard Specification for Poly (Vinyl Chloride) Sheet Roofing

vii. ASTM E 108 - Standard Test Methods for Fire Tests of Roof Coverings

viii. ASTM E 119 - Standard Test Methods for Fire Tests of Building Construction and

Materials

c. SYSTEM DESCRIPTION

i. General - Provide installed roofing membrane and base flashings that remain watertight; do not permit the passage of water; and resist specified uplift pressures, thermally induced movement, and exposure to weather without failure. Existing taper to roof drains shall be maintained or improved upon so that a water test verifies no ponding at any location.

ii. Material Compatibility: Provide roofing materials that are compatible with one another under conditions of service and application required, as demonstrated by roofing membrane manufacturer based on testing and field experience.

d. PHYSICAL PROPERTIES

i. Roof product must meet the requirements of Type III PVC sheet roofing as defined by ASTM D 4434 and must meet or exceed the following physical properties.

1. Thickness: 50 mil, nominal, in accordance with ASTM D 751

2. Thickness Over Scrim: ≥ 28 mil in accordance with ASTM D 751

3. Breaking Strengths: ≥ 390 lb. ft. (MD) and ≥ 438 lbf. (XMD) in accordance with ASTM D 751, Grab Method

4. Elongation at Break: ≥ 31% (MD) and ≥ 31% (XMD) in accordance with

ASTM D 751, Grab Method

5. Heat Aging in accordance with ASTM D 3045: 176 °F for 56 days. No sign of cracking, chipping or crazing. (In accordance with ASTM D 4434)

6. Factory Seam Strength: ≥ 417 lb.ft. in accordance with ASTM D 751, Grab Method

7. Tearing Strength: ≥ 132 lb.ft. (MD) and ≥ 163 lbf. (XMD) in accordance with ASTM D 751, Procedure B

8. Low Temperature Bend (Flexibility): Pass at -40 °F in accordance with

ASTM D 2136

9. Accelerated Weathering: No cracking, checking, crazing, erosion or chalking after 5,000 hours in accordance with ASTM G 154

10. Linear Dimensional Change: < 0.5% in accordance with ASTM D 1204 at

176 ± 2 °F for 6 hours

11. Water Absorption: < 1.7% in accordance with ASTM D 570 at 158 °F for

166 hours

12. Static Puncture Resistance: ≥ 56 lbs. in accordance with ASTM D 5602

13. Dynamic Puncture Resistance: ≥ 14.7 ft-lb. in accordance with ASTM

D 5635

14. Exposed Face Color – White (Housing Blocks A and C) and approved color (Rainbow Forest Museum)

ii. Accessory Materials – Provide accessory materials approved for use by manufacturer

1. Sheet Flashing – Manufacturer’s standard reinforced PVC sheet flashing

2. Prefabricated flashings – Factory-made using Manufacturer’s standard reinforced PVC membrane

a. Stack flashing

b. Curb flashing

c. Inside and outside corners

d. Drain boots, composite drain rings (CDR) and dome strainers

e. Vinyl coated pitch pans

3. Sealants and Adhesives – compatible with roofing system and supplied by Manufacturer

a. Caulking adhesive approved by submittal

b. Strip mastic

c. Pitch pocket filler

4. Slip Sheet – compatible with roofing system and supplied by

Manufacturer

5. Fasteners and Plates – factory-coated steel fasteners and metal or plastic plates meeting corrosion-resistance provisions in FMG 4470, designed for fastening membrane and insulation to substrate, supplied by Manufacturer.

a. #14 heavy duty fasteners

b. Cleat plates

c. 3 inch metal plates

6. PV Anchors

7. Termination and Edge Details – supplied by Manufacturer

a. Termination bar

b. Universal 2-piece compression metal system

c. Fascia base with Kynar steel cover

8. Vinyl Coated Metal – supplied by Manufacture: 24 gauge, hot-dipped galvanized, grade 90 metal with a minimum of 17 mil of PVC membrane laminated to one side.

9. Two-way Roof Vents – supplied by Manufacturer, install a minimum of one vent for each 1,000 square feet of roof area.

10. Walkways – provide non-skid, maintenance-free walkway pads in areas of heavy foot traffic and around mechanical equipment.

iii. Cool Roof Rating Council (CRRC) - Membrane must be listed on CRRC website

1. Initial Solar Reflectance: ≥ 88%

2. Initial Thermal Emittance: ≥ 87%

3. Initial Solar Reflective Index (SRI): ≥ 111

4. 3-Year Aged Solar Reflectance: ≥ 68%

5. 3-Year Aged Thermal Emittance: ≥ 84%

6. 3-Year Aged Solar Reflective Index (SRI): ≥ 82

4. Submittals

a. Data sheets on each product to be used, including:

i. Preparation instructions and recommendations

ii. Storage and handling requirements and recommendations

iii. Installation methods

iv. Maintenance requirements

b. Shop Drawings: Indicate insulation pattern, overall membrane layout, field seam locations, joint or termination detail conditions, and location of fasteners.

c. Verification Samples: For each product specified, two samples, representing actual product, color, and finish

i. Color palette of available colors for selection by the government

ii. 4 inch by 6 inch sample of roofing membrane, of color specified

iii. 4 inch by 6 inch sample of walkway pad

iv. Termination bar, fascia bar with cover, drip edge and gravel stop if to be used

v. Each fastener type to be used for installing membrane, insulation/recover board, termination bar and edge details

d. Installer Certification: Certification from the roofing system manufacturer that Installer is approved, authorized, or licensed by manufacturer to install roofing system.

e. Manufacturer's warranties

5. Quality Assurance

a. Perform work in accordance with manufacturer's installation instructions.

b. Manufacturer Qualifications: A manufacturer specializing in the production of PVC membranes systems and utilizing a Quality Control Manual during the production of the membrane roofing system that has been approved by and is inspected by Underwriters

Laboratories.

c. Installer Qualifications: Company specializing in installation of roofing systems similar to those specified in this project and approved by the roofing system manufacturer.

d. Source Limitations: Obtain components for membrane roofing system from roofing membrane manufacturer.

e. There shall be no deviations from the roof membrane manufacturer's specifications or the approved shop drawings without the prior written approval of the manufacturer.

6. Regulatory Requirements

a. Conform to applicable code for roof assembly wind uplift and fire hazard requirements.

b. Fire Exposure: Provide membrane roofing materials with the following fire-test-response characteristics. Materials shall be identified with appropriate markings of applicable testing and inspecting agency.

c. Exterior Fire-Test Exposure - Class B; ASTM E 108, for application and roof slopes indicated

d. Fire-Resistance Ratings: Comply with ASTM E 119 for fire-resistance-rated roof assemblies of which roofing system is a part

e. Conform to applicable code for roof assembly fire hazard requirements.

f. Wind Uplift - Roofing System Design: Provide a roofing system designed to resist uplift pressures calculated according to the current edition of the ASCE-7 Specification

Minimum Design Loads for Buildings and Other Structures.

7. Pre-Installation Meeting

a. Convene meeting not less than one week before starting work of this section.

b. Review methods and procedures related to roof deck construction and roofing system including, but not limited to, the following.

i. Meet with National Park Service Facility Manger or representative

ii. Testing and inspecting agency representative, roofing installer, roofing system manufacturer's representative, deck installer, and installers whose work interfaces with or affects roofing including installers of roof accessories and roof-mounted equipment.

c. Review and finalize construction schedule and verify availability of materials, installer's personnel, equipment, and facilities needed to make progress and avoid delays.

d. Examine deck substrate conditions and finishes for compliance with requirements, including flatness and fastening.

e. Review structural loading limitations of roof deck during and after roofing.

f. Review base flashings, special roofing details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that will affect roofing system.

g. Review governing regulations and requirements for insurance and certificates if applicable.

h. Review temporary protection requirements for roofing system during and after installation.

i. Review roof observation and repair procedures after roofing installation.

8. Delivery, Storage and Handling

a. Deliver roofing materials to Project site in original containers with seals unbroken and labeled with manufacturer's name, product brand name and type, date of manufacture, and directions for storing and mixing with other components.

b. Store liquid materials in their original undamaged containers in a clean, dry, protected location and within the temperature range required by roofing system manufacturer.

Protect stored liquid material from direct sunlight.

c. Protect roof insulation materials from physical damage and from deterioration by sunlight, moisture, soiling, and other sources. Store in a dry location. Comply with insulation manufacturer's written instructions for handling, storing, and protecting during installation.

d. Store roof materials and place equipment in a manner to avoid permanent deflection of deck.

e. Store and dispose of solvent-based materials, and materials used with solvent-based materials, in accordance with requirements of NPS authorities.

9. Execution

a. EXAMINATION

i. Verify that the surfaces and site conditions are ready to receive work.

ii. Verify that the deck is supported and secured.

iii. Verify that the deck is clean and smooth, free of depressions, waves, or projections, and properly sloped to drains, valleys, eaves, scuppers or gutters.

iv. Verify that the deck surfaces are dry and free of standing water, ice or snow.

v. Verify that all roof openings or penetrations through the roof are solidly set.

vi. Prior to re-covering an existing roofing system, conduct an inspection of the roof system accompanied by a representative of the membrane manufacturer or an authorized contractor.

1. Determine required fastener type, length, and spacing.

2. Verify that moisture content of existing roofing is within acceptable limits.

3. Identify damaged areas requiring repair before installation of new roofing.

4. Conduct core cuts as required to verify information required.

b. PREPARATION

i. Clean surfaces thoroughly prior to installation.

ii. Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the substrate under the project conditions.

iii. Surfaces shall be clean, smooth, and free of fins, sharp edges, loose and foreign material, oil, grease, and bitumen.

c. INSTALLATION

i. Install insulation in accordance with the roof manufacturer's requirements.

ii. Separation Slip Sheet - Install in accordance with the roof manufacturer’s requirements.

iii. Roof Membrane: 50 mil, PVC thermoplastic membrane.

1. Use only fasteners, stress plates and fastening patterns accepted for use by the roof manufacturer. Fastening patterns must meet the applicable design requirements.

2. Install fasteners in accordance with the roof manufacturer’s requirements. Fasteners that are improperly installed shall be replaced or corrected.

3. Mechanically fasten membrane to the structural deck utilizing fasteners and fastening patterns that in accordance with the roof manufacturer’s requirements.

4. Cut membrane to fit neatly around all penetrations and roof projections.

5. Unroll roofing membrane and positioned with a minimum 6 inch overlap.

iv. Seaming

1. Weld overlapping sheets together using hot air. Minimum weld width is

1-1/2 inches.

2. Check field welded seams for continuity and integrity and repair all imperfections by the end of each work day.

v. Membrane Termination/Securement - All membrane terminations shall be completed in accordance with the membrane manufacturer’s requirements.

1. Provide securement at all membrane terminations at the perimeter of each roof level, roof section, curb flashing, skylight, expansion joint, interior wall, penthouse, and other similar condition.

2. Provide securement at any angle change where the slope or combined slopes exceeds two inches in one horizontal foot.

vi. Flashings: Complete all flashings and terminations as indicated on the drawings and in accordance with the membrane manufacturer’s requirements.

1. Provide securement at all membrane terminations at the perimeter of each roof level, roof section, curb flashing, skylight, expansion joint, interior wall, penthouse, and other similar condition.

2. Do not apply flashing over existing thru-wall flashings or weep holes.

3. Secure flashing on a vertical surface before the seam between the flashing and the main roof sheet is completed.

4. Extend flashing membrane a minimum of 6 inches (152 mm) onto the main roof sheet beyond the mechanical securement.

5. Use care to ensure that the flashing does not bridge locations where there is a change in direction (e.g. where the parapet meets the roof deck).

vii. Penetrations

1. Flash all pipes, supports, soil stacks, cold vents, and other penetrations passing through the roofing membrane as indicated on the Drawings and in accordance with the membrane manufacturer’s requirements.

2. Utilize custom prefabricated flashings supplied by the membrane manufacturer.

3. Existing Flashings: Remove when necessary to allow new flashing to terminate directly to the penetration.

viii. Pipe Clusters and Unusual Shapes

1. Clusters of pipes or other penetrations which cannot be sealed with prefabricated membrane flashings shall be sealed by surrounding them with a prefabricated vinyl-coated metal pitch pan and sealant supplied by the membrane manufacturer.

2. Vinyl-coated metal pitch pans shall be installed, flashed and filled with sealant in accordance with the membrane manufacturer’s requirements.

3. Pitch pans shall not be used where prefabricated or field fabricated flashings are possible.

ix. Roof Drains

1. Coordinate installation of roof drains and vents.

2. Remove existing flashing and asphalt at existing drains in preparation for sealant and membrane.

3. Provide a smooth clean surface on the mating surface between the clamping ring and the drain base.

x. Edge Details

1. Provide edge details as indicated on the Drawings. Install in accordance with the membrane manufacturer’s requirements.

2. Join individual sections in accordance with the membrane manufacturer’s requirements.

3. Coordinate installation of metal flashing and counter flashing.

4. Manufactured Roof Specialties: Coordinate installation of copings, counter flashing systems, gutters, downspouts, and roof expansion assemblies.

xi. Walkways

1. Install walkways in accordance with the membrane manufacturer’s requirements.

2. Install walkway pads at roof hatches, access doors, rooftop ladders and all other traffic concentration points regardless of traffic frequency.

3. Provided in areas receiving regular traffic to service rooftop units or where a passageway over the surface is required.

4. Do not install walkways over flashings or field seams until manufacturer’s warranty inspection has been completed.

xii. Water cut-offs

1. Provide water cut-offs on a daily basis at the completion of work and at the onset of inclement weather.

2. Provide water cut-offs to ensure that water does not flow beneath the completed sections of the new roofing system.

3. Remove water cut-offs prior to the resumption of work.

4. The integrity of the water cut-off is the sole responsibility of the roofing contractor.

5. Any membrane contaminated by the cut-off material shall be cleaned or removed.

d. FIELD QUALITY CONTROL

i. The membrane manufacturer’s representative shall provide a comprehensive final inspection after completion of the roof system.

ii. All application errors shall be addressed and final punch list completed.

e. PROTECTION

i. Protect installed roofing products from construction operations until completion of project.

ii. Where traffic is anticipated over completed roofing membrane, protect from damage using durable materials that are compatible with membrane.

iii. Repair or replace damaged products after work is completed.

10. Other Provisions

a. Contractor shall provide a construction schedule to the Contracting Officer at the preconstruction conference. Please provide at least 24 hour notice to the Contracting

Officer prior to mobilization and commencement of work.

b. Contractor shall provide for the safety of employees engaged in project work in compliance with OSHA regulations. “Tailgate” safety meetings shall be held once before the commencement of work and at least once weekly thereafter.

c. Petrified Forest National Park reserves the right to inspect the work in progress at any time, without prior notice to the Contractor.

d. Unless other arrangements are made in advance, project work may be undertaken during normally scheduled hours of the park Maintenance staff - 8:00 am to 4:30 pm, Monday through Friday. No work shall be scheduled on Federal holidays or weekends without prior approval from facility manager or contract officer representative.

e. Contractor is responsible for daily cleanup or work areas, securing and disposing of loose items that could become windblown, trash collection and removal, and providing temporary restroom facilities to accommodate workers on site. Portable toilets must be removed from site within five (5) working days of work completion.

f. Site Visit - A pre-bid meeting and site inspection tour will be held at Petrified Forest

National Park.

g. The Government will not furnish any property other than necessary utilities for this project. If damage occurs to an unknown utility, Contractor shall repair the utility. An equitable adjustment will be made in accordance with the Changes clause of the contract.

h. Hauling - Contractor shall comply with all legal load restrictions in the hauling of materials. Load restrictions on park roads are identical to the state load restrictions with such additional regulations as may be imposed by the Park Superintendent.

Information regarding rules and regulations for vehicular traffic on park roads may be obtained from the CO and/or COR. A special permit will not relieve the Contractor of liability for damage that may result from moving of equipment.

i. Permits – Any and all mandatory permits, inspections, calibration, and documentation required to do the described work shall be obtained by the Contractor, and any costs involved shall be included in the contract price.

j. Disposal – Unless otherwise specified, all removed material becomes the property of the

Contractor and shall be disposed of outside the park.

k. Accident Prevention – The Contractor is expected to ensure a safe environment for all personnel and visitors and shall comply with all applicable sections of the Occupational

Safety and Health Act (OSHA). In case of conflicts between federal, state, and local safety and health requirements, the most stringent shall apply. Equipment or tools not meeting OSHA requirements will not be allowed on the project sites. Contractor must meet the requirements of The National Institute for Occupational Safety and Health

(NIOSH) for personal protective equipment. Contractor must have a first-aid kit available at the work site. The Contractor shall report all accidents to the COR as soon as possible and assist the COR and other officials, as required, in the investigation of the accident.

l. Air and Water Pollution Control – Contractor shall take all necessary reasonable measures to reduce air and water pollution by any material or equipment used during construction. Do not dispose of volatile wastes or oils or any other material in storm or sanitary drains.

m. Project Closeout – The Contractor shall request in writing a final inspection.

i. Before requesting the final inspection, the Contractor shall remove all tools, equipment, surplus materials, rubbish, and restore to original condition surfaces or structures that are damaged due to work of this contract.

ii. At the time of final inspection, the project shall be complete.

iii. When work is determined to be substantially complete, the CO and/or COR will prepare a list of deficiencies to be corrected before final acceptance.

iv. The Contractor shall complete the work described on the list of deficiencies within ten (10) calendar days, weather permitting.

v. If the Contractor fails to complete the work within this time frame, the

Contracting Officer may replace, repair, or remedy the work with an appropriate reduction in the contract price.

n. If work is not determined to be substantially complete, Contracting Officer will notify Contractor in writing. After completing work, Contractor shall resubmit certification and request a new final inspection.

11. Warranty

a. Contractor's Warranty – The contractor shall warrant the roof application with respect to workmanship and proper application for a minimum of two (2) years from the effective date of the warranty issued by the manufacturer.

b. Manufacturer's Warranty – Must provide for completion of repairs, replacement of membrane or total replacement of the roofing system at the then-current material and labor prices throughout the life of the warranty. In addition the warranty must meet the following criteria:

i. Warranty Period: 20 years from date issued by the manufacturer

1. First 15 years

a. Must provide for completion of repairs, replacement of membrane or total replacement of the roofing system at the then-current material and labor prices.

b. No exclusions for incidental or consequential damages.

2. Last 5 years - Excludes incidental and consequential damages.

ii. No exclusion for damage caused by ponding water

iii. No exclusion for damage caused by biological growth

iv. Issued direct from and serviced by the roof membrane manufacturer

v. Transferable for the full term of the warranty.