Construction Specifications for DHT-DMN-TXO VOR's.doc

DEPARTMENT OF TRANSPORTATION

FEDERAL AVIATION ADMINISTRATION

SOUTHWEST REGION

CONSTRUCTION SPECIFICATION

REPLACE ROOFS

Dalhart, TX Texico, TX

Deming, NM

The following specifications and advisements constitute the working portion of the contract between the Contractor and the Federal Aviation Administration, an Agency of the Federal Government. The Contracting Officer (CO) assigned to this contract shall be the only individual with authority to speak for and contractually bind the FAA. All communications, authorizations, approvals, changes, modifications, etc. involving this contract shall be with and through the CO. Any action not approved by the CO shall not bind the FAA.

Contracting Officers Technical Representative (COR) - The Contracting Officer (CO) may assign a Contracting Officers Technical Representative (COR) to oversee the work on the project and act as a technical point of contact. A letter stating the COR’s responsibilities and authority will be issued when a COR is assigned.

Project Locations – Dalhart, TX (DHT) VOR: Facility is located approximately 0.75 miles north of the intersection of Ponderosa Lane and US Highway 84 in Dalhart, Texas.

Latitude: 36.09145, Longitude: -102.5446.

Texico, TX (TXO) VOR: Facility is located approximately 1 mile north of the intersection of County Road S and County Road 12 southeast of Bovina, Texas.

Latitude: 34.495, Longitude: -102.8397.

Deming, NM (DMN) VOR: Facility is located approximately 5 miles west of the intersection of Highway 549 (Pine Street) and Highway 377 in Deming, New Mexico.

Latitude: 32.2755, Longitude: -107.6055.

SECTION 1 GENERAL REQUIREMENTS

General: These specifications cover the requirements of the Federal Aviation Administration, hereinafter referred to as the Government or FAA, for all work associated with the construction required to install an adhered PVC single-ply membrane roof on each listed facility.

Site Visit: Site visits are recommended, but not required. However, the contractor is responsible for any discrepancies that could be revealed during a site visit. Site visits may be arranged by contacting Nikolai Ruiz, Acting El Paso NAVCOM SSC Manager, at 915-775-0750, for site located in New Mexico. Contact Rick Hurst, Amarillo SSC Manager, at 806-335-4060, to arrange a site visit to the facilities located in Dalhart, TX and Texico, TX.

Length of Contract: The total contract time for this project shall not exceed 90 calendar days.

FAA Onsite Representative: The Contracting Officer will designate a FAA Representative known as the Contracting Officer’s Technical Representative (COTR) to be present during normal working hours.

SITE ACCESS, CONSTRUCTION LIMITS, USE OF FACILITIES AND WORK HOURS

Existing Facility: The VOR is a critical navigational facility operating 24-hours, 7-days per week. The facility shutdown must be coordinated with the FAA at least 30 days prior to construction.

Work Hours: All work shall be performed between 7:00 a.m. and 4:00 p.m., five days per week, Monday through Friday, except that no work shall be performed on Federal Holidays. All work schedules shall be coordinated with the SSC and/or COR.

Contractor’s Schedule: The Contractor shall prepare a written schedule of his proposed work listing daily work accomplishments and submit it to the FAA Contracting Officer before starting work. The schedule shall contain all major items of work with relative dates of starting and completion.

Construction Limits: The Contractor shall confine storage and employee parking to the site as directed by the COR. Additional space the Contractor deems necessary shall be obtained off site, at no additional cost to the Government.

Weather Delay: The Contractor shall obtain the approval of the COR each day prior to beginning the next day’s work activity. The COR may suspend all work activity in the event that outdoor weather conditions pose a threat of damage to the building exterior, the building interior, or equipment.

Site Access and Security: Access to the site shall be determined by the COR through coordination with FAA personnel and will be given to the Contractor at the Pre-Construction Meeting. The Contractor shall maintain the security integrity of the building at all times.

Inspection of Site by Contractor: Contractor must have carefully examined the premises to determine the extent of work and the conditions under which it must be done during an initial pre-bid site survey.

Contractors’ Use of Premises: Contractor shall work in conjunction with the operations of the facility within the construction staging area limits for the execution of the work. The Contractor and subcontractors shall maintain the job site in a neat and orderly condition.

Security Investigation: Contractor’s personnel may be subject to security investigation by FAA. Upon request by the COR, the Contractor shall promptly complete all security forms provided by the COR.

Damage to Site: Damage to existing buildings, grounds, drainage, paving, or utilities, caused by the Contractor’s activities, or that of his employees or subcontractors shall be repaired to their pre-construction condition. The Contractor shall pay all costs of repairs. After notice to proceed and prior to the commencement of construction, the Contractor and COR shall conduct joint inspections of the existing areas affected by the construction. Existing damage or defects shall be noted and will be used as the basis for determination of damages caused by the Contractor’s operations. The Contractor shall clean work and non-work areas of any material, which falls from equipment.

END OF SECTION

SECTION 2 SCOPE OF WORK

Roof:

The following items of work need to be completed:

1. Remove the existing roof down to the roof base boards.

2. Contractor shall provide crane service to remove/replace antenna shelter. Mailbox antennas shall be removed by FAA personnel. FAA personnel must be present for the removal of all antennas.

3. Paint mailbox antennas with two coats of Sherwin Williams Waterbased Tile-Clad epoxy finish, or approved equal.

4. Installation of an expanded metal mesh welded to form a continuous electrical ground on the roof substrate and exothermically welded to the earth electrode ground via a minimum of four separate Thompson 28 down conductors using #6 AWG.

5. The mesh shall be welded to the monitor antenna bracket bolts. Braze #6 AWG to base plates underneath the Alford Loop antennas within antenna shelter. The mesh shall be ¾” #9 gauge galvanized steel expanded flat metal.

6. Replace deteriorated substrate (maximum 10%) prior to roofing installation.

7. Install minimum 4”, 24-gauge metal flashing/edging. Repair/repaint soffit/flashing area as required due to weather-related deterioration. Flashing must be notched, as necessary, to allow antennas to be mounted.

8. Install an adhered PVC roof system per the manufacturer’s recommendations.

9. Sealing perimeter of roof and junction of roof and VOR antenna shelter. Install a flashing boot around antenna shelter.

10. Installation of walkway material around the perimeter of the antenna shelter extending to the ladder support.

11. Verify and exothermically weld/reconnect if needed the down conductors to the EES grounding system.

12. Clean up the site to original condition.

The antenna shelter is fiberglass, measuring 10-foot diameter by 26-foot tall, located at the center of the counterpoise roof. The shelter and TACAN antenna combine to weigh approximately 2000 pounds. The shelter shall be properly secured with a minimum of three guyed ropes to prevent any damage while displaced from the roof location. The contractor will provide crane service for loading/unloading shelter onto transport trailer. Any damages incurred to the shelter and TACAN antenna will be the responsibility of the contractor at no added expense to the government.

The antenna shelters will be refurbished by a separate contractor. FAA will be responsible for transporting the shelter to and from the facility location and the refurbishment contractor.

Grounding: Dalhart VOR and Texico VOR Building EES: Contractor shall install 4 ground rods (10’ x ¾” Copper clad steel) installed 2-6 feet outside the foundation or exterior footing of the VOR building and interconnected by a 4/0 AWG stranded copper conductor, minimum of 2 feet below grade with ends exothermically welded. These ground rods shall be spaced to comply with NEC 250.53 (B) requirement which is 6 feet minimum. Top of the Ground rods shall not be less than 1 foot below grade level. All connections to the ground rods shall be exothermically welded. Contractor shall exothermically weld a bond between the new and old building EES. The size of the bond conductor shall be field determined to be compatible with both systems. The roofing down conductors shall be welded to the new 4/0 AWG ground conductor.

The main ground plate shall be connected to the EES with a single 500 kcmil conductor. The conductor from the main ground plate to the EES shall be exothermically welded at the EES and at the main ground plate. A UL listed pressure connector to the ground plate is permissible. The main ground plate location shall be chosen to minimize conductor length, but shall not be more than 50 feet from the EES. Ground plates shall be copper and at least 12 long, 6 wide and ¼ inch thick.

Painting: Deming VOR

The Deming VOR shall include a complete exterior painting package. The facility shall be properly prepped to include scraping any loose paint from the building. The exterior masonry block shall be painted with a masonry block sealer and two (2) topcoats of paint. Doors shall be primed and painted with 2 topcoats. Color shall be selected and approved by FAA representative.

END OF SECTION

SECTION 3 FAA TO COORDINATE FACILITY WORK

The roofs shall be covered during non-work hours with an all-weather temporary covering. The Contractor shall be available to repair the temporary roofing at any time during non-work hours.

1. The FAA will verify the facility is ready for contracted scope of work.

END OF SECTION

SECTION 4 PREPARATION FOR RE-ROOFING

4.0 SUMMARY

A. Section Includes:

1. Roof tear-off. Remove existing tar and gravel and other roofing system components down to the deck. Tear off includes removal of unused cable anchors and roof penetration pipes. Protect the existing electrical service feed.

B. Related Sections include the following:

1. Section 6, “Sheet Metal Flashing and Trim” for metal roof penetration flashings, flashings, and counter flashings.

2. Section 8, “Carpentry Work for Roofing and Soffit” for wood nailers, cants, curbs, and blocking.

4.01 FAA PROPERTY

A. Except for items or materials indicated to be reused, reinstalled, or otherwise indicated to remain FAA’s property, demolished materials shall become Contractor’s property and shall be removed from the RCLR site.

4.02 DEFINITIONS

A. Roofing Terminology: Refer to ASTM D 1079 and glossary in NRCA's "The NRCA Roofing and Waterproofing Manual" for definition of terms related to roofing work in this Section.

B. Existing Roofing System: Asphaltic roofing, roof insulation, surfacing, and components and accessories between deck and roofing.

C. Roof Tear-Off: Removal of existing asphaltic roofing system from deck up.

D. Remove: Detach items from existing construction and legally dispose of them off-site unless indicated to be removed and reinstalled.

E. Existing to Remain: Existing items of construction that are not indicated to be removed.

4.03 SUBMITTALS

A. None required for this section.

4.04 QUALITY ASSURANCE

A. Regulatory Requirements: Comply with governing EPA notification regulations before beginning tar and gravel roofing removal. Comply with hauling and disposal regulations of authorities having jurisdiction.

4.05 PROJECT CONDITIONS

A. FAA will occupy portions of building immediately below reroofing area. Conduct reroofing so FAA's operations will not be disrupted. Provide FAA with not less than 72 hours’ notice of activities that may affect FAA's operations.

B. Protect building to be reroofed, adjacent buildings, walkways, site improvements, exterior plantings, and landscaping from damage or soiling from reroofing operations.

C. Maintain access to existing walkways, corridors, and other adjacent occupied or used facilities.

D. Contractor is responsible for conclusions derived from existing roofing conditions.

E. Weather Limitations: Proceed with reroofing preparation only when existing and forecasted weather conditions permit work to proceed without water entering existing roofing system or building.

SECTION 4.1 – PRODUCTS - NOT USED

SECTION 4.2 – EXECUTION

4.21 PREPARATION

A. Coordinate with FAA to shut down air-intake equipment in the vicinity of the work. Cover air-intake vents before proceeding with reroofing work that could affect indoor air quality or activate smoke detectors in the ductwork.

B. During removal operations, have sufficient and suitable materials on-site to facilitate rapid installation of temporary protection in the event of unexpected rain.

4.22 ROOF TEAR-OFF

A. General: Notify FAA each day of extent of roof tear-off proposed for that day.

B. Roof Tear-Off: Remove existing tar and gravel and other roofing system components down to the deck. Tear off includes removal of unused cable anchors and roof penetration pipes. Protect the existing electrical service feed.

4.23 DECK PREPARATION

A. Inspect deck after tear-off of tar and gravel roofing system.

B. Verify that substrate is visibly dry and free of moisture. The roofing system cannot be installed over a wet substrate. The Contractor and the COR shall take such action needed to provide a dry substrate.

4.24 DISPOSAL

A. Collect demolished materials and place in containers. Promptly dispose of demolished materials. Do not allow demolished materials to accumulate on-site.

1. Storage or sale of demolished items or materials on-site is not permitted.

A. Transport and legally dispose of demolished materials off FAA's property.

END OF SECTION

SECTION 5 APPROVED MEMBRANE ROOF PRODUCTS

5.0 - GENERAL

5.01 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions, apply to this Section.

5.02 SUMMARY

A. This roofing specification is based on installation of a PVC membrane roofing system with a 30-year warranty as manufactured by Sika Sarnafil. Equal roofing systems of other manufacturer’s will be considered if they can be demonstrated to be an equal product with the same warranty. The Contractor shall comply with all the specific roofing manufacturer’s installation details/requirements.

B. Summary of Work: In order to provide a complete warrantable roof system, roofing Contractor is to provide all labor, tools, equipment, and materials to complete the reroofing project. Such materials that are required, but are not necessarily limited to:

1. 80-mil minimum, PVC membranes, with a nine- (9) ounce per square yard polyester felt backing.

2. 80-mil minimum polyester reinforced membrane flashing details.

3. 1/2” Siliconized Gypsum, fire tested hardboard with glass-mat facers.

4. PVC coated clad metal for perimeter metal edging.

5. Air/Vapor Barrier, Wood Nailers, 1-1/2” Polyisocyanurate Insulation.

C. This Section includes the following:

1. Adhered PVC sheet roofing

2. Polyisocyanurate Insulation

3. Cover board

4. Air / Vapor Barrier D. Scope of Work: The scope of work includes the minimizing of the intrusion of dust and debris, created by the process of the installation of the new PVC Roofing System. The phased installation of the new roof system will be installed in such a manner as to maintain a watertight integrity on a daily basis. Over the cleaned and prepared substrate, the specified air / vapor barrier, the specified polyisocyanurate insulation, cover board, and the roofing system manufacturer’s 80-mil PVC membrane shall be installed in order to meet the project’s roofing design guidelines. All flashing membranes, pre-fabricated metal, and PVC coated clad metal will be install in accordance with roofing system manufacturer's recommendations. The completed PVC roof system and roofing system manufacturer’s supplied accessories shall be installed in such a manner so that the roofing system manufacturer’s Thirty-(30) year Full Systems (NDL) Warranty can be issued upon successful completion of the roofing project.

E. Related Sections include the following:

1. Section 7, ”Joint Sealants”

2. Section 8, “Carpentry Work (For Roofing & Soffit)”

5.03 DEFINITIONS

A. PVC: Polyvinyl Chloride.

B. Installer:

Roofing Contractor. Refer to ASTM D 1079 and glossary of NRCA's "The NRCA Roofing and Waterproofing Manual" for definition of terms related to roofing work in this Section. Retain two definitions below if design uplift pressure subparagraphs based on SPRI's "Wind Load Design Guide for Fully Adhered and Mechanically Fastened Roofing Systems" are retained in "Performance Requirements" Article. The membrane roofing system must resist, at a minimum, design uplift pressure. Design uplift pressure, multiplied by a safety factor, produces the factored design uplift pressure.

1) Retain two definitions below if design uplift pressure subparagraphs based on SPRI's "Wind Load Design Guide for Fully Adhered and Mechanically Fastened Roofing Systems" are retained in "Performance Requirements" Article. The membrane roofing system must resist, at a minimum, design uplift pressure. Design uplift pressure, multiplied by a safety factor, produces the factored design uplift pressure.

5.04 REFERENCES

A. American Society of Civil Engineers (ASCE): ASCE 7 – Minimum Design Loads for Buildings and Other Structures.

B. Single-Ply Roofing Institute (SPRI): Application Guidelines and Wind Design Guidelines for Various Single Ply Membranes

C. National Installers Association (NRCA): Current Roofing and Waterproofing Manual

D. Sheet Metal and Air Conditioning Contractor’s National Association (SMACNA): Current SMACNA Technical Manuals.

E. Underwriters Laboratories (UL):

1. Roof Materials and Systems Directory. 2012.

2. UL 790: Tests for Fire Resistance of Roof Covering Materials: 1983.

F. American Society for Testing and Materials (ASTM)

1. ASTM D 570 – 1981 (R 1988) Water Absorption of Plastics

2. ASTM D 638 – 1991 Tensile Properties of Plastics

3. ASTM D 751 – 1989 Coated Fabrics

4. ASTM D 882 – 1991 Tensile Properties of Thin Plastic Sheeting

5. ASTM D 1004 – 1990 Initial Tear Resistance of Plastic Film and Sheeting

6. ASTM D 1204 – 1984 Linear Dimensional Changes of Non-rigid PVC Sheeting or Film at Elevated Temperature

7. ASTM D 2136 – 1984 (R 1989) Coated Fabrics – Low-Temperature Bend Test

8. ASTM D 2565 – 1982 Operating Xenon Arc-Type Light Exposure Apparatus With and Without Water for Exposure of Plastics

9. ASTM D 3045 – 1974 ( 1984) Heat Aging of Plastics Without Load

10. ASTM D 4434 – 1987 Poly (Vinyl Chloride) Sheet Roofing

11. ASTM E 108 – 1991 (Rev. A) Fire Tests of Roof Coatings

12. ASTM G 21 – 1990 Determining Resistance of Synthetic Polymeric Materials to Fungi

13. ASTM G 53 – 1991 Operating Light – and Water-Exposure Apparatus (Fluorescent UV-Condensation Type) for Exposure of Nonmetallic Materials

5.05 PERFORMANCE REQUIREMENTS

A. General Performance: Installed membrane roofing and base flashings shall withstand specified uplift pressures, thermally induced movement, and exposure to weather without failure due to defective manufacture, fabrication, installation, or other defects in construction. Membrane roofing and base flashings shall remain watertight.

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

C. Roofing System Design: Comply with SPRI “Wind Design Guide for Adhered Single Ply Roofing Systems” for the following ground roughness exposure, classification of building and system design:

1. Surface Roughness Category: Exposure C

2. Classification of Building: Category IV

3. Wind uplift Design: 90 mph @ 3 second gust

4. System 1 Design: Adhered Single Ply Membrane Roofing D. FM Approvals Listing: Provide membrane roofing, base flashings, and component materials that comply with FMG Approvals 4450 and FMG Approvals 4470 as part of a thermoplastic membrane roofing system, and that are listed in FMG Approvals” “RoofNav” for Class 1 construction. Identify materials with FMG Approvals markings on shop drawings, including fastening requirements for field, perimeter, and corners. Parameters roofing assembly shall conform to:

1. Fire/Windstorm Classification: Class 1A-90

2. Hail Resistance Rating: Severe E. Underwriters Laboratories Inc. (UL):

1. UL RMSD – 2009 Roofing Materials and Systems Directory

2. UL 790 – 2009 Fire Resistance of Roofing Coverings Materials

3. Exterior Fire Exposure Classification: Class A, ASTM E 108, for application and slopes shown

5.06 ACTION SUBMITTALS

A. Product Data: Submit latest edition of roofing system manufacturer’s roofing and base flashing specifications including list of materials proposed for use, installation procedures, and roofing system manufacturer’s Product Safety Data Sheets.

5.07 INFORMATION SUBMITTALS

A. Qualification Data: For qualified Installer and roofing system manufacturer.

B. Installer: Provide copy of roofing system manufacturer’s training certificate for each roofing mechanic permit to use the hot air welding equipment.

C. Roofing system manufacturer Certificates: Signed by roofing system manufacturer certifying that roofing system complies with requirements specified in "Performance Requirements" Article.

1. Submit evidence of compliance with performance requirements.

2. Provide sample copy of 30-year (NDL) Full System roofing system manufacturer's warranty stating obligations, remedies, limitations, and exclusions of warranty.

3. Provide sample of copy 5-year Installer’s workmanship warranty stating obligations, remedies, limitations, and exclusions of warranty.

5.08 CLOSE OUT SUBMITTALS

A. Maintenance Data: For roofing system to include in maintenance manuals.

B. 30-year warranty on roofing system C. 5-year installation warranty

D. Inspection Report: Copy of roofing system roofing system manufacturer's final inspection report of completed roofing installation.

5.09 QUALITY ASSURANCE

A. Roofing System Manufacturer Qualifications: A qualified roofing system manufacturer that is certified for the membrane roofing system identical to that used for this Project.

B. Installer Qualifications:

1. A qualified firm that is approved, authorized, or licensed by membrane roofing system manufacturer to install product and that is eligible to receive roofing system manufacturer’s special warranty.

2. Installer must have a current status of “Elite” or “Alliance” with the roofing system manufacturer.

C. Roofing system manufacturer’s membrane shall meet the following characteristics:

1. Protective membrane surface coating to resist accumulation of air borne contaminants such as dust and dirt.

2. Membrane Thickness: Membrane roofing system manufacturer is to verify that the membrane thickness is of the membrane thickness specified (see 2.02, A, 2). ASTM D751 or D638 nominal thickness of +/- 10 percent will not be acceptable for measurement of membrane thickness.

D. Source Limitations: Obtain components including roof insulation, fasteners, and accessories for membrane roofing system from same roofing system manufacturer as membrane roofing.

E. Exterior Fire-Test Exposure: ASTM E 108, Class A; for application and roof slopes indicated, as determined by testing identical membrane roofing materials by a qualified testing agency. Materials shall be identified with appropriate markings of applicable testing agency.

F. Pre-installation Conference: Before installing roofing system, conduct conference at Project site. Notify participants at least 10 working days before conference.

1. Meet with FAA’s COTR/General Contractor, testing and inspecting agency COR, 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.

2. Review methods and procedures related to roofing installation, including roofing system manufacturer’s written instructions.

3. Review and finalize construction schedule and verify availability of materials, Installer’s personnel, equipment, and facilities needed to make progress and avoid delays.

4. Examine deck substrate conditions and finishes for compliance with requirements, including the expected flatness and fastening.

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

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

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

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

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

G. At no cost to Federal Aviation Administration, roofing system manufacturer’s technical representative shall perform:

1. Manufacturer’s Quality Control Inspection: The Manufacturer’s Technical Representative shall review the on-going work on the first day of the roofing production and a minimum of one (1) in-progress inspection every 10 working days. The Technical Representative shall:

a. Communicate with the Federal Aviation Administration USA project manager, i.e. before entering the “work area,” contact the Federal Aviation Administration designated project manager upon arrival at the Federal Aviation Administration facility.

b. Note all defects noted non-compliance with the specifications or the recommendations of the thermoplastic manufacturer should be itemized in a punch list. Pictures of the punch list items and the roof area inspected shall accompany the inspection report. The punch list items must be corrected immediately by the contractor to the satisfaction of the Federal Aviation Administration USA COR.

c. Ensure the roofing contractor has received a copy of each In-Progress Inspection Report within two days of the inspection. The roofing contractor is to forward the Project On-site COR a copy of the In-Progress Inspection Report.

2. Final Roof Inspection: Contractor is to arrange for roofing system manufacturer’s technical personnel to inspect roofing installation on completion of the roofing project.

a. All defects noted non-compliance with the specifications or the recommendations of the thermoplastic manufacturer should be itemized in a punch list. These items must be corrected immediately by the contractor to the satisfaction of the Federal Aviation Administration USA and Sika Sarnafil.

b. The roofing contractor is to forward a copy of Final Inspection Report to the FAA COTR within two days after date inspection(s) is performed.

H. Installer’s Responsibility: Any failure by the FAA COR or roofing system manufacturer’s Representative to detect, pinpoint, or object to any defect or noncompliance of these specifications of work in progress or completed work shall not relieve the Installer, or reduce, or in any way limit, his responsibility of full performance of work required of the Installer under these specifications.

5.010 DELIVERY, STORAGE AND HANDLING

A. Deliver roofing materials to Project site in original containers with seals unbroken and labeled with roofing system manufacturer’s name, product brand name, and type, date of manufacture, and directions for storing and mixing with other components. Deliver materials in sufficient quantity to allow work to proceed without interruption.

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

1. Discard and legally dispose of liquid material that cannot be applied within its stated shelf life.

C. Store and protect materials, including roofing insulation from physical damage and from deterioration by sunlight, moisture, soiling, and other sources. Store all materials in a dry location. Use pallets to support all materials from roof deck. Distribute the load to stay within live load limits of the roof construction. Remove unused materials from the roof at the end of each day’s work. Comply with roofing system manufacturer’s written instructions for handling, storing, and protecting during installation.

D. Handle and store roofing materials and place equipment in a manner to avoid permanent deflection of deck.

5.011 PROJECT CONDITIONS

A. Weather Limitations: Proceed with roofing work only when existing and forecasted weather conditions permit roofing to be installed according to roofing system manufacturer’s written instructions and warranty requirements.

B. The PVC adhered membrane shall not be installed under the following conditions without consulting manufacturer for precautionary steps:

1. The roof assembly permits interior air to pressurize the membrane underside.

2. Any exterior wall has 10% or more of the surface area comprised of opening doors or windows.

3. The wall/deck intersection permits air entry into the wall flashing area.

C. Protective wear shall be worn when using solvents or adhesives or as required by job conditions.

D. Weather Limitations: Proceed with installation only when existing and forecasted weather conditions permit roofing system to be installed according to roofing system manufacturer’s written instructions and warranty requirements.

E. Protection:

1. Provide special protection and avoid traffic on completed areas of membrane installation.

2. Restore to original condition or replace work or materials damaged during handling of roof materials.

3. Take precautions as required to protect adjacent work and structures.

F. Emergency Equipment and Materials: Maintain onsite equipment and materials necessary to apply emergency temporary edge seal in event of sudden storms or inclement weather. If inclement weather occurs while a temporary water stop is in place, the Installer shall provide the labor necessary to monitor the situation to maintain a watertight condition.

G. Protection:

1. Arrange work sequence to avoid use of newly constructed Roofing for storage, walking surface, and equipment movement. Where such access is absolutely required, the Installer shall provide all necessary protection and barriers to segregate the work area and to prevent damage to adjacent Roofing areas.

2. The Installer shall provide a suitable temporary protective surface for all roofing areas which will receive construction traffic or construction of equipment during all phases of the roofing project.

3. During the course of installation of the membrane roofing systems, should there be any damage created by other construction trades to the new or to existing roofing membrane and/or roofing system, the Installer is to immediately notify the FAA’s COR and membrane roofing system manufacturer. All damages are to be repaired according to the membrane roofing system manufacturer’s or FAA’s COR’s recommendations. The Contractor or the Contractor’s Sub-contractor responsible for the roofing damages shall bear the total cost for the repairs or for the replacement of existing or new roofing system.

H. Restrictions:

1. Comply with FAA’s General and Safety Requirements on use of site.

2. Smoking and Tobacco products are prohibited on all roof areas and on the campus grounds.

3. No food products are allowed on the roof or on the facility grounds at any time.

4. Provide and maintain sanitary facilities for employees.

5. Maintain facility and all utility services in a functional condition.

5.012 WARRANTY

A. General Warranty: The warranties specified in this Article shall not deprive the FAA of other rights of the FAA may have under other provisions of the Contract Documents and shall be in addition to, and run concurrent with, other warranties made by the Installer under requirements of the Contract Documents.

B. Roofing System Manufacturer’s Warranty: Submit a written warranty, without monetary limitation, with all available options, including flashing endorsement, roofing system manufacturer's roof insulation and roofing system manufacturer’s accessories, signed by roofing system manufacturer agreeing to promptly repair leaks resulting from defects in materials or workmanship for the following warranty period:

1.

Thirty (30) Year Full System Warranty (no ponding/standing water exclusions accepted). Warranty shall be non-prorated and cover basic wind speeds up to 74 mph.

C. Installer's Warranty: Submit roofing Installer's workmanship warranty, on a notarized written warranty form, signed by Installer, covering Work of this Section, including membrane roofing, sheet flashing, cover board, roof insulation, fasteners, adhesives, sealants, and associated sheet metal, for the following warranty period:

1. Warranty Period: Five (5) years from date of Substantial Completion.

SECTION 5.1 PRODUCTS

5.101 ROOFING SYSTEM MANUFACTURER

A. The components of the roof system are to be products of a single roofing system manufacturer or approved by the Sika Sarnafil, whose products meet or exceed the project specifications, have manufactured and installed the roofing materials and systems of the type specified for a minimum of thirty (30) years, and who maintains a single source responsibility for the total roofing system.

B. Roofing system manufacturers: The components of the roofing system are to be products of a single roofing system manufacturer as required to provide the specified system warranty. Subject to compliance with requirements, provide roofing products from:

1. Sika Sarnafil, Canton, MA.

2. Federal Aviation Administration Approved Equal.

5.102 PVC MEMBRANE

A. PVC Membrane: “G410,” a uniform, flexible sheet formed from polyvinyl chloride, complying with ASTM D 4434-87, of the following Classification – Type and Grade, Membrane Thickness, UL Classification, and Membrane Exposed Face Color.

1. Classification: Type II, Grade I.

2. Membrane Thickness: 80 mils, +/- 2.0 mils.

3. UL Class: A.

4. Membrane: Exposed Face Color: White

5.103 AUXILIARY MATERIALS

A. General: Furnish auxiliary materials recommended by roofing system manufacturer for intended use and compatible with membrane roofing materials.

1. Furnish liquid-type auxiliary materials that meet VOC limits of authorities having jurisdictions.

B. Membrane flashing and Flashing Accessories: As recommended by the roofing system manufacturer's printed instructions for reinforced sheet flashing of same material, mil thickness and color as sheet membrane.

C. Insulation Fasteners: Roofing system manufacturer approved corrosion resistant steel #14 screws of the appropriate size and type for roof membrane and insulation attachment. A #14 corrosion-resistant fastener is used with insulation plates to attach insulation boards to concrete decks. Fasteners for the insulation shall be supplied and installed as recommended by the roofing system manufacturer’s printed instructions.

D. Insulation Securement Plates: Roofing system manufacturer approved corrosion resistant steel, 3 inch round plates, of the appropriate size and type for the securement of the insulation to approved substrates. Securement plates for the insulation shall be supplied and installed as recommended by the roofing system manufacturer’s printed instructions.

E. Membrane Securement Plates: Roofing system manufacturer approved corrosion resistant steel, 2 inch round plates for the securement of the membrane to the steel roof decks. Securement plates for the membrane shall be supplied and installed as recommended by the roofing system manufacturer’s printed instructions.

F. Membrane Securement Screw: Roofing system manufacturer approved corrosion resistant steel #14screws of the appropriate size and type for roof membrane securement. A #14, heavy-duty, corrosion-resistant fastener used with membrane securement plates and bars to attach PVC roof membrane to concrete decks. Fasteners for the membrane shall be supplied and installed as recommended by the roofing system manufacturer’s printed instructions.

G. Membrane Bonding Adhesive: Roofing system manufacturer’s approved contact adhesive used to attach membrane to the horizontal or near-horizontal substrate. Application rates are to be as recommended by roofing system manufacturer's printed instructions.

H. Membrane Flashing Bonding Adhesive: Roofing system manufacturer’s approved contact adhesive used to attach the flashing membrane to the substrate, either horizontally or vertically. Application rates are to be as recommended by roofing system manufacturer's printed instructions.

I. Membrane Securement Bar: A 1-inch wide aluminum alloy bar used with #14 to clamp the PVC membrane to the roof deck along walls, curbs, and certain vertical to horizontal changes in the roofing system.

J. Sealants: FAA approved sealant shall be used to seal penetrations through the membrane system and at miscellaneous sealant applications that are exposed to roof systems components.

K. Sealing Tape: “Multi-Purpose Tape,” a high performance sealant tape with superior surface tack that remains elastic and is designed to bond the PVC membrane and a variety of metals. “Multi-Purpose” sealing tape strip is used to seal the metal roof edge of buildings reducing air infiltration into the roof assembly, behind the membrane flashing at termination details, and to seal the overlaps of the air/vapor retarder membrane.

L. Pre-Fabricated Pipe Flashing: Prefabricated vent pipe flashing made from 0.060-inch (60 mil/1.5 mm) thick PVC membrane.

M. Pre-Fabricated Corner Flashing: “Sarnacorners,” prefabricated universals corners made of 0.060-inch (60 mil/1.5 mm) thick membrane that are heat-weldable to membrane or “Sarnaclad” base flashings.

N. Membrane Coated Metal: A PVC-coated, heat-weldable sheet metal manufactured from a 24 gauge, G90 galvanized metal sheet with a 20 mil (0.5 mm) unsupported PVC membrane laminated on one side.

O. Other miscellaneous materials shall be of the “best grade” available and to be approved in writing by the roofing system manufacturer for the specific application.

5.104 INSULATION

A. General: Provide preformed roof insulation boards that comply with requirements, selected from roofing system manufacturer’s standard sizes and of thickness indicated.

A. Roof and Tapered Insulation: A rigid polyisocyanurate foam insulation composed of a closed cell polyisocyanurate foam core laminated to a glass fiber mat facer on both major surfaces. The insulation shall have the following characteristics:

1. Dimensional Stability (length and width) per ASTM D 2185: <2%.

2. Compressive Strength (10% Deformation) per ASTM D 1621: 20 psi.

3. Product Density per ASTM D 1622: Nominal 2.0 pcf.

4. Flame Spread per ASTM E84 (Full 10 min. Test): 20-50*

5. The insulation board is to have a minimum conditioned thermal value per inch of an LTTR Value of 5.5 as determined by CAN/ULC-5770.

6. The insulation board shall have a minimum compressive strength of 20 psi and a dimensional stability of -2% linear changes, maximum seven (7) days.

A. Provide flat stock insulation boards as indicated on roof plans

1. Minimum average R-value 30.0.

B. Tapered Insulation:

1. Base layer thickness: 1.5 inches.

2. Provide factory-tapered insulation boards fabricated to slope of 1/4 inch per 12 inches as indicated on roof plans.

3. Provide 1/8 inch per foot tapered boards at primary roof drains to create a 4 feet x 4 feet drain sump.

4. Provide factory-tapered insulation boards fabricated to slope of ½ inch per 12 inches saddles, crickets, tapered edge strips, and other insulation shapes for sloping to drain.

5. Provide ½ inch per 12 inch saddles on the “high side” of all equipment, measuring 18 inches and greater in width.

5.105 COVER BOARD

A. Furnish auxiliary materials recommended by roofing system manufacturer for intended use and compatible with membrane roofing materials.

1. Type and Thickness: Gypsum core board with a thickness of 1/2-inch: 4 feet x 8 feet.

2. UL Class A (UL 790) and ULC S-102

3. Product: Subject to compliance with requirements, provide product as manufactured by:

a. “Dens-Deck Prime®” as manufactured by Georgia-Pacific Corporation.

5.106 VAPOR RETARDER / AIR BARRIER

A. Sheet Vapor Retarder: SBS modified bitumen, 32 mils, with a self-adhesive backing; having a maximum perm rating of 0.017 perms. Include manufacturer's recommended primer for substrate preparation.

1. SBS Modified: The top surface is a high-density polyethylene grid laminated between two layers of polyethylene film. A silicone release plastic film covers the self-adhesive.

2. Approved Primer: A primer used to prepare different substrates prior to the application of self-adhered vapor barrier.

5.107 INSULATION AND COVER BOARD ACCESSORIES

A. General: Furnish roof insulation accessories recommended by insulation roofing system manufacturer for intended use and compatible with membrane material.

B. Fasteners: Factory-coated steel fasteners and metal plates meeting corrosion-resistance, designed for fastening roof insulation and cover board to substrate, and acceptable to roofing system manufacturer.

5.108 SPRAY IN PLACE FOAM SEALANT

A. Spray in Place Foam Sealant: A two-component, quick-cure polyurethane foam that fills cavities, penetrations, cracks, and expansion joints.

B. Applicable ASTM Standards:

1. C203 – Standard Test Methods for Breaking Load and Flexural Properties of Block-Type Thermal Insulation

2. C273 – Standard Test Method for Shear Properties of Sandwich Core Materials

3. C518 – Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus

4. D1621 – Standard Test Method for Compressive Properties of Rigid Cellular Plastics

5. D1622 – Standard Test Method for Apparent Density of Rigid Cellular Plastics

6. D1623 – Standard Test Method for Tensile and Tensile Adhesion Properties of Rigid Cellular Plastics

7. D2842 – Standard Test Method for Water Absorption of Rigid Cellular Plastics

8. E96 – Standard Test Methods for Water Vapor Transmission of Materials

9. E283 – Standard Test Method for Determining Rate of Air Leakage Through Exterior Windows, Curtain Walls and Doors Under Specified Pressure Differences Across the Specimen

10. E2178 – Standard Test Method for Air Permeance of Building Materials C. Approved Roofing system manufacturer and Product: Dow Building Solutions, “FROTH-PAK™” or approved equal.

5.109 RELATED MATERIALS

A. Timber, General: Hand select material at factory from lumber of species and grade indicated below for compliance with "Appearance" grade requirements of ALSC National Grading Rule; provide certificate of inspection from an accredited Agency for selected material.

1. Provide seasoned lumber with 19 percent moisture content at time of dressing and shipment, for sizes 2-inches or less in thickness.

2. Provide lumber with 15 percent moisture content at time of dressing and shipment for, sizes 2-inches or more in thickness.

B. Dimensioned Lumber: Graded in accordance with established grading rules; grade and species as follows:

1. Concealed Boards: WWPA standard grade, any species, or SPIB No. 3 grade Southern Pine.

2. Lumber for Miscellaneous Uses: Standard grade unless otherwise indicated.

3. Plywood: PS 1; select sheathing grade or APA rated 5/8-inch minimum thickness, CD-X, or better in sheathing.

5.110 MISCELLANEOUS FASTENERS AND ANCHORS

A. General: All fasteners, anchors, nails, straps, bars, etc. shall be post-galvanized steel, aluminum, or stainless steel. Mixing metal types and methods of contact shall be assembled in such a manner as to avoid galvanic corrosion. Fasteners for attachment of metal to masonry shall be expansion type fasteners with stainless steel pins. All concrete fasteners and anchors shall have a minimum embedment of 1¼ inch (32 mm) and shall be approve for such use by the fastener roofing system manufacturer. All miscellaneous wood fasteners and anchors used for flashings shall have a minimum embedment of 1 inch (25 mm), stainless steel, and to be approved for such use by the fastener roofing system manufacturer.

5.2 EXECUTION

5.201 INSPECTION

A. Inspect entire roof area to be roofed for acceptability. Examine substrates, areas, and conditions for compliance with the following requirements and other conditions affecting installation and performance of the roofing system:

3. Verify that roof openings and penetrations are in place, and curbs are set and braced, and that the roof drains and drain lines are properly clamped into position and are in a 100% functional condition.

4. Verify that primary drain bodies are at proper elevations for construction of sump at slopes indicated.

5. Verify that secondary overflow drain bodies are at proper elevations for construction, without sumps, at level of roof surface.

A. The Roofing Contractor shall conduct fastener pullout tests in accordance with the August 11, 2011 revision of the ANSI/SPRI FX-1 - American National Standard – Standard Field Test Procedure for Determining the Withdrawal Resistance of Roofing Fasteners.

B. Verify that structural use panels, sheathing, and similar wood products are securely anchored to substrates, and that surfaces of panels and sheathing are without irregularities which could interfere with proper membrane and flashing installation.

Retain first subparagraph below for steel roof deck.

C. Verify that wood or steel deck is securely fastened with no projecting fasteners and no adjacent units in exceed 1/16 inch (1.6 mm) or more out of plane measured to adjoining deck.

D. Verify that installed wood or steel roof decking complies with required slopes indicated, that no holes, ridges, voids, uneven or misaligned surfaces or conditions, gaps, or other irregularities exist, and deck and substrates are smooth and free of sharp edges.

E. Other conditions that would prevent proper application of roofing or that would prevent membrane roofing manufacturer's approval of substrate, components, or system.

F. Verify that roofing systems can be installed with positive drainage of minimum slopes indicated at all areas of roof, without ponding after 24 hours.

G. Verify that roofing as completed will discharge to internal roof drains without ponding or inadvertent discharge through secondary roof drains.

H. Verify that final installed curb heights for membrane flashing are a minimum of 8-inches (200 mm) measured above finished roof membrane.

I. Verify locations of interior electrical conduits, piping, ducts, and similar items in close proximity to underside of steel roof decking, to avoid striking with fasteners.

J. Do not commence work until decking and substrates are in full compliance with roof system manufacturer's requirements, deck and substrate conditions are sound, and positive fall to drainage points are achieved.

K. Commencement: Commencement of work indicates roofing contractor’s acceptance of conditions and responsibility for all corrections required to meet the project contract requirements.

5.202 PREPARATION

A. The Roofing Contractor will be entirely responsible for the complete removal of all dirt, debris, moisture from the roof’s substrate, i.e. wood, steel decking, or concrete decking, before the installation of the roofing system.

B. Cleaning: Clean substrate including metal decking bottom flutes of dust, debris, moisture, and other substances detrimental to roofing installation. Remove sharp projections.

C. Cleaning, repair or replacement of damaged items, as a result of roofing related materials entering the facility, shall be solely at the roofing contractor's expense.

D. Determine Safety Impact with Owner’s Employees: Exhaust Fans, Fresh Air In-takes, Air Conditioning Units, and Interior Smoke Detectors when applying adhesives or when hot air welding the membrane. When required by owner, the roofing contractor shall provide activated carbon filters and other approved means to prevent fumes, odors and PVC “smoke” from entering the facility.

E. Promptly remove debris each day; do not stockpile debris or allow waste to accumulate on roofing under construction, adjoining roof areas, or on the facility’s grounds.

F. Containment: Prevent materials from entering and clogging roof drains and conductors and from spilling or migrating onto surfaces of other construction at the end of the workday or when rain is forecast. Remove roof-drain plugs when no work is taking place or when rain is forecast.

G. Mask off adjoining surfaces not receiving roofing membrane materials to prevent spillage or over spray affecting other construction.

H. Fill all gaps and voids between substrate components that are wider than 1/4 inch. Fill all gaps with same materials as the substrate.

I. Base Vertical Membrane Flashings: Coordinate roof insulation and cover board thickness with adjacent base flashing height, to maintain not less than 8-inch (203 mm) membrane flashing height. Adjust base vertical flashing height including substrates and changes in exterior wall materials to maintain minimum height. Contractor will be responsible for all cost for any modifications required to roof top equipment, i.e. roof hatches, exhaust fans, pipe and electrical penetrations, metal counter flashings, cut-in reglet, to meet the minimum 8-inch membrane flashing height.

J. Proceed with roofing work only when weather conditions permit work to proceed in accordance with manufacturer’s requirements and recommendations.

K. Seal around pipes, conduits, and other penetrations for a distance of 2 inches minimum with the specified spray in place foam insulation.

5.203 WOOD NAILER INSTALLATION

A. All Wood Nailers shall be anchored to resist a minimum force of 300 pounds per lineal foot (4,500 Newtons/lineal meter) in any direction. Individual nailer lengths shall not be less than 3 feet (0.9 meter) long.