FAK VOR Specifications 06-01-2017.pdf

Department of Transportation

Federal Aviation Administration

Southern Regional Office

1701 Columbia Avenue College Park, Georgia 30337

FAK VOR 1504869

06/01/2017

Submitted By:

Engineer Services/Infrastructure Engineering, Atlanta, AJW-2E15J

Project Engineer …………………………………………... Richard Polk

Specification For

“INSTALLATION OF

ROOFING MEMBRANE SYSTEM

ON THE VOR FACILITY ROOF”

FLAT ROCK VIRGINIA

APP Roof for the VORTAC Facility at Flat Rock , VA

TABLE OF CONTENTS

DIVISION 1 - GENERAL REQUIREMENTS --------------------------------------------------------- 4

SECTION 1A - SUMMARY OF WORK ----------------------------------------------------------------------------------- 4 1A.1 General ------------------------------------------------------------------------------------------------------------------------------ 4 1A.2 Scope of Work --------------------------------------------------------------------------------------------------------------------- 4 1A.3 Coordination ------------------------------------------------------------------------------------------------------------------------ 6 1A.4 Sanitary Facilities ----------------------------------------------------------------------------------------------------------------- 6 1A.5 Material ------------------------------------------------------------------------------------------------------------------------------ 6 1A.6 Material Storage ------------------------------------------------------------------------------------------------------------------- 6 1A.7 Ingress and Egress to Work Areas ------------------------------------------------------------------------------------------- 6 1A.8 Cleaning ----------------------------------------------------------------------------------------------------------------------------- 6 1A.9 Contractor’s Warranty ----------------------------------------------------------------------------------------------------------- 7 1A.10 Manufacturer's Warranty ------------------------------------------------------------------------------------------------------- 7 1A.11 Contractor's Liability ------------------------------------------------------------------------------------------------------------- 8 1A.12 Workmanship ---------------------------------------------------------------------------------------------------------------------- 8 1A.13 Pre-Construction Conference ------------------------------------------------------------------------------------------------- 8 1A.14 Hot-Air Welder -------------------------------------------------------------------------------------------------------------------- 8 1A.15 Repair Material -------------------------------------------------------------------------------------------------------------------- 8 1A.16 Project Drawings ------------------------------------------------------------------------------------------------------------------ 8 1A.17 Site Visit ----------------------------------------------------------------------------------------------------------------------------- 9 1A.18 Work Permits ---------------------------------------------------------------------------------------------------------------------- 9 1A.19 Asbestos Free Certification ---------------------------------------------------------------------------------------------------- 9 1A.20 Hazardous Material and Safety --------------------------------------------------------------------------------------------- 10

DIVISION 2 – SITE WORK ----------------------------------------------------------------------------- 11 SECTION 2A – EQUIPMENT REMOVAL ------------------------------------------------------------------------------ 11

2A.1 Scope of Work ------------------------------------------------------------------------------------------------------------------- 11 2A.2 TACAN Antenna Removal ---------------------------------------------------------------------------------------------------- 11 2A.3 Fiberglass Antenna Shelter Removal -------------------------------------------------------------------------------------- 11 2A.4 Azimuth Positioner Brackets ------------------------------------------------------------------------------------------------- 12 2A.5 Protection of Roof During Construction ----------------------------------------------------------------------------------- 12

DIVISION 6 – CARPENTRY --------------------------------------------------------------------------- 13 SECTION 6A - DECKING -------------------------------------------------------------------------------------------------- 13

6A.1 Scope of Work ------------------------------------------------------------------------------------------------------------------- 13 6A.2 Material ---------------------------------------------------------------------------------------------------------------------------- 13 6A.3 Replacement of Damaged Decking ---------------------------------------------------------------------------------------- 13

DIVISION 7 – MOISTURE PROTECTION --------------------------------------------------------- 14 SECTION 7A – EQUIPMENT PROTECTION ------------------------------------------------------------------------- 14

7A.1 Scope of Work ------------------------------------------------------------------------------------------------------------------- 14 7A.2 Material ---------------------------------------------------------------------------------------------------------------------------- 14 7A.3 Installation ------------------------------------------------------------------------------------------------------------------------ 14 7A.4 Vapor Barrier --------------------------------------------------------------------------------------------------------------------- 14

SECTION 7B - OVERLAYMENT/RECOVER BOARD --------------------------------------------------------------- 12

7B.1 Scope of Work ------------------------------------------------------------------------------------------------------------------- 12 7B.2 Materials --------------------------------------------------------------------------------------------------------------------------- 13 7B.3 Installation ------------------------------------------------------------------------------------------------------------------------ 13

SECTION 7B – SINGLE-PLY PVC ROOFING MEMBRANE ------------------------------------------------------ 14

7B.1 Scope of Work ------------------------------------------------------------------------------------------------------------------- 14 7B.2 Material ---------------------------------------------------------------------------------------------------------------------------- 14 7B.3 Caulking for PVC Membrane------------------------------------------------------------------------------------------------- 15 7B.4 Weather Limitations ------------------------------------------------------------------------------------------------------------ 16 7B.5 Quality Assurance -------------------------------------------------------------------------------------------------------------- 16

7B.6 Product Delivery and Storage ----------------------------------------------------------------------------------------------- 16 7B.7 Membrane Installation --------------------------------------------------------------------------------------------------------- 16 7B.8 Weather Protection ------------------------------------------------------------------------------------------------------------- 18 7B.9 Field Quality Control------------------------------------------------------------------------------------------------------------ 18

SECTION 7C – APP MODIFIED ROOFING MEMBRANE --------------------------------------------------------- 18 7C.1 Scope of Work ------------------------------------------------------------------------------------------------------------------- 18 7C.2 Material ---------------------------------------------------------------------------------------------------------------------------- 18 7C.3 Caulking --------------------------------------------------------------------------------------------------------------------------- 19 7C.4 Weather Limitations ------------------------------------------------------------------------------------------------------------ 19 7C.5 Quality Assurance -------------------------------------------------------------------------------------------------------------- 19 7C.6 Product Delivery and Storage ----------------------------------------------------------------------------------------------- 20 7C.7 Membrane Installation --------------------------------------------------------------------------------------------------------- 20 7C.8 Weather Protection ------------------------------------------------------------------------------------------------------------- 21 7C.9 Field Quality Control------------------------------------------------------------------------------------------------------------ 22

SECTION 7D – LIQUID APPLIED ROOFING MEMBRANE ------------------------------------------------------- 22 7D.1 Scope of Work ------------------------------------------------------------------------------------------------------------------- 22 7D.2 Material ---------------------------------------------------------------------------------------------------------------------------- 22 7D.3 Surface Preparation ------------------------------------------------------------------------------------------------------------ 22 7D.4 Coating Application ------------------------------------------------------------------------------------------------------------- 23 7D.5 Application Rates --------------------------------------------------------------------------------------------------------------- 23 7D.6 Restrictions/Limitations -------------------------------------------------------------------------------------------------------- 24 7D.7 Membrane Installation --------------------------------------------------------------------------------------------------------- 25

DIVISION 9 – FINISHES -------------------------------------------------------------------------------- 26 SECTION 9A – VINYL SOFFIT AND FASCIA ------------------------------------------------------------------------- 26

9A.1 Scope of Work ------------------------------------------------------------------------------------------------------------------- 26 9A.2 Material ---------------------------------------------------------------------------------------------------------------------------- 26 9A.3 Quality Assurance -------------------------------------------------------------------------------------------------------------- 27 9A.4 Delivery, Storage, and Handling -------------------------------------------------------------------------------------------- 27 9A.5 Workmanship -------------------------------------------------------------------------------------------------------------------- 27

DIVISION 10 – SPECIALITIES ------------------------------------------------------------------------ 28 SECTION 10A – ANTENNA SHELTER --------------------------------------------------------------------------------- 28

10A.1 Scope of Work ------------------------------------------------------------------------------------------------------------------- 28 10A.2 Inspection ------------------------------------------------------------------------------------------------------------------------- 28 10A.3 Material ---------------------------------------------------------------------------------------------------------------------------- 28 10A.4 Shelter Door and Louvers ---------------------------------------------------------------------------------------------------- 29 10A.5 Sealant Removal ---------------------------------------------------------------------------------------------------------------- 29 10A.6 Sealant Replacement - Exposed Surfaces ------------------------------------------------------------------------------- 30 10A.7 Shelter Surface Preparation -------------------------------------------------------------------------------------------------- 31 10A.8 Shelter Repair -------------------------------------------------------------------------------------------------------------------- 32 10A.9 Shelter Refurbishing ----------------------------------------------------------------------------------------------------------- 32 10A.10 Resin Application --------------------------------------------------------------------------------------------------------------- 32 10A.11 Painting of Antenna Shelter -------------------------------------------------------------------------------------------------- 33 10A.12 TACAN Mounting Fixture Painting ------------------------------------------------------------------------------------------ 33 10A.13 Inspection ------------------------------------------------------------------------------------------------------------------------- 34 10A.14 Antenna Shelter Base Gasket ----------------------------------------------------------------------------------------------- 34 10A.15 Antenna Shelter Installation -------------------------------------------------------------------------------------------------- 34

SECTION 10B – TARPAULIN --------------------------------------------------------------------------------------------- 34 SECTION 10C – AZIMUTH POSITIONER BRACKETS ------------------------------------------------------------ 36 SECTION 10D – ELECTRICAL RECEPTACLE ---------------------------------------------------------------------- 36

10D.1 Scope of Work ------------------------------------------------------------------------------------------------------------------- 36 10D.2 Material ---------------------------------------------------------------------------------------------------------------------------- 36

SECTION 10E – COUNTERPOISE REPLACEMENT --------------------------------------------------------------- 36 10E.1 Scope of Work ------------------------------------------------------------------------------------------------------------------- 37 10E.2 Removal of Existing Terne-Coated Roofing ------------------------------------------------------------------------------ 37 10E.3 Replace Damaged Wood ----------------------------------------------------------------------------------------------------- 37 10E.4 Counterpoise Materials -------------------------------------------------------------------------------------------------------- 37 10E.5 Soldering Equipment ----------------------------------------------------------------------------------------------------------- 38 10E.6 Soldering Procedures ---------------------------------------------------------------------------------------------------------- 38

DIVISION 15 – PLUMBING ---------------------------------------------------------------------------- 40 SECTION 15A – ANTENNA SHELTER DRAIN ----------------------------------------------------------------------- 40

15A.1 Scope of Work ------------------------------------------------------------------------------------------------------------------- 40 15A.2 Material ---------------------------------------------------------------------------------------------------------------------------- 40 15A.3 Pipe Sleeves --------------------------------------------------------------------------------------------------------------------- 40 15A.4 Insect Screen -------------------------------------------------------------------------------------------------------------------- 40 15A.5 General ---------------------------------------------------------------------------------------------------------------------------- 40

DIVISION 1 – GENERAL REQUIREMENTS

SECTION 1A – SUMMARY OF WORK

1A.1 GENERAL: This specification, along with project drawings, codes and standards covers the requirements of the Federal Aviation Administration (FAA) to remove and appropriately dispose existing roofing material down to the deck, and install a fully adhered roofing membrane on the VOR facility at Flat Rock Virginia

1A.1.1 SPECIAL NOTE: This document includes specifications for a wide variety of VOR roof configurations. The Contractor is only required to follow the directions that apply to the roof at FAK VOR. The sections that describe antennas & grounding can be disregarded.

1A.2 SCOPE OF WORK: The Contractor shall perform all work described in the Scope Of

Work Document dated 06/01/2017. All work will comply with the applicable specifications given below:

A. Remove existing roof & edge trim down to the bare wood deck.

B. Replace any rotted wood decking.

C. Install vapor barrier (Section 7A.4).

D. Install treated plywood nailers (Section 6).

E. After installing vapor barrier on the roof surface, install 1/2-inch DensDeck

Prime Roof Board® (mechanically attached with seams staggered against insulation seams).

F. After roof board, install a two-ply fully adhered roofing membrane over entire roof surface including inside the fiberglass antenna shelter according to

Section 7C of this specification. (Disregard membrane types specified in

Sections 7D and 7E.)

G. Install flashing with membrane factory coating around perimeter of roof counterpoise.

H. Provide one tarpaulin 50 feet square to cover the roof during construction

(Section 7C.8).

1A.3 COORDINATION: The project resident engineer (RE) shall coordinate between the contractor and the System Support Center (SSC) office manager, the facility employees, and Airway Facilities System Management Office (SMO) manager. All coordination shall be through the project Resident Engineer (RE).

1A.4 SANITARY FACILITIES: Sanitary facilities are not available at the site. The contractor shall provide temporary toilet facilities as required for his workmen. Temporary toilet facilities shall be of the type approved by the local governing body. The location of the toilet facilities shall be as directed by the resident engineer.

1A.5 MATERIAL: The contractor shall furnish all material, equipment, and labor to complete the job. The use of brand names or equal products in this specification does not constitute a requirement that they are the only materials that meet the specifications in this contract.

They are used as an illustration of known acceptable sources or products.

1A.6 MATERIAL STORAGE: The contractor shall store all material in such a manner that they are protected from damage due to external elements including climate and weather conditions. Contractor furnished materials shall not be stored inside the FAA equipment building.

1A.7 INGRESS AND EGRESS TO WORK AREAS: Ingress and egress to the work areas shall be as shown on the construction safety plan or as directed by the resident engineer.

Security precautions against unauthorized entry to the site or building shall be maintained.

1A.8 CLEANING:

A. Work Area. The contractor shall keep the work area clean. All rubbish and waste resulting from the execution of work shall be removed and properly disposed at the end of each day or as directed by the resident engineer. The terne-coated metal pans shall not be disposed in a landfill but recycled as appropriate, in accordance with federal, state and local regulations.

B. Waste Packing Material: Immediately after unpacking, all packing material, case lumber, excelsior and any other rubbish, flammable or otherwise, shall be removed from the building and the premises.

C. Final Clean Up: Upon completion of work and before final inspection, the contractor shall remove his working tools, equipment, debris, rubbish, and unused materials from the building site.

D. Disposal: Disposal of rubbish, debris, and gravel will be completely off

Airport Property at contractor’s expense.

1A.9 CONTRACTOR’S WARRANTY: In addition to the one year “Warranty of

Construction”, the contractor shall warranty the shelter to be leak free for one additional year beyond the expiration of the first year warranty.

In the event of water penetrating through the shelter due to failure in the shelter caulking, the contracting officer shall notify the contractor in writing, within reasonable time after the discovery of the failure, defect, or damage. If the contractor fails to remedy any failure, defect, or damage within a reasonable period of time after receipt of notice, the

Government shall have the right to replace, repair, or remedy the failure at the contractor’s expense.

1A.10 MANUFACTURER’S WARRANTY: The roofing membrane material shall be guaranteed against defects by the manufacturer and be leak-free for a period of 20 years after completion. The warranty shall identify FAA as owner of the facility. The location and effective starting date of warranty shall be indicated. (The warranty shall be without any financial limitation in case of roof replacement)

The contractor shall not be responsible for damage to the roof from extreme weather conditions such as tornadoes, hurricane force winds (75 mph), lightning strikes, large hail, or damage caused by maintenance people working on the roof surface.

In the event of water penetrating the roof system through a failure in the roofing membrane, the System Support Center Manager (SSCM) shall notify the contractor in writing, within reasonable time after the discovery of the failure, defect, or damage. If the contractor fails to remedy any failure, defect, or damage within a reasonable time after receipt of notice, the Government shall have the right to replace, repair, or remedy the failure at the contractor’s expense.

All labor, material, and travel expenses incurred to make the necessary repairs within the warranty period shall be at no cost to the FAA.

The Airway Facilities SSC (Service Support Center) personnel responsible for maintenance of the facility shall coordinate the temporary shutdown for the contractor to make necessary repairs.

1A.11 CONTRACTOR’S LIABILITY: Damage to existing facilities and equipment caused by the contractor shall be reported to the resident engineer without delay. The contractor will be responsible for the repair of all damaged areas of the building or equipment at the contractor’s expense. All repairs shall be accomplished to the satisfaction of the resident engineer.

1A.12 WORKMANSHIP: All work shall be accomplished by experienced workers in accordance with the highest standards of the various work trades involved.

1A.13 PRE-CONSTRUCTION CONFERENCE: The contractor shall attend a pre-construction conference prior to starting work at a location agreed to by the contractor and the contracting officer.

1A.14 HOT-AIR WELDER: The contractor shall furnish to the resident engineer (FAA) a new hot-air welder gun at the pre-construction meeting.

The hot air welder gun shall meet the following specifications:

Parameter Specification

Nozzle ¾” wide flat nozzle

Voltage 120/220 VAC, 50/60 Hz

Capacity approximately 1600 Watts

Noise Level approximately 65 dB (A)

Temperature Ambient – 12000 F (Ambient - 6500 C)

Weight approximately 3 lbs.

A product that meets these requirements is the Eagle 2000 manufactured by Cadillac

Products and available from Clements National Company. The nozzle # is 8741.

Another product is the Leister Triac model manufactured by Leister and available from

Uneco Systems, Inc., 1413 Sherman Rd, # 70, Romeoville, Illinois – 60446.

1A.15 REPAIR MATERIAL: The contractor shall furnish a minimum of 25 square feet of roofing membrane to the resident engineer on completion of the project. The membrane will be stored at the VOR site to be used for future repairs if necessary.

1A.16 PROJECT DRAWINGS: There are no FAA drawings for this project. All work is described in a separate written narrative SOW document dated 01/10/2017.

Drawing Revision Date Title n/a - n/a

1A.17 SITE VISIT:

Bidders are encouraged to visit the site and carefully examine the areas in question as to conditions that may affect proper execution of the work. All dimensions and quantities shall be determined or verified by the contractor. No claims for extra costs will be allowed because of lack of full knowledge of the existing conditions.

1A.18 WORK PERMITS:

All construction and working permits required by local and state agencies shall be procured by the contractor at no expense to the FAA.

1A.19 ASBESTOS FREE CERTIFICATION:

The Contractor shall provide to the Contracting Officer (CO) a signed statement stating that to the best of his/her knowledge; no asbestos-containing building materials were used during the renovation and modernization of this facility.

If the FAA suspects the presence of asbestos, the FAA will sample the suspect material to verify that no asbestos-containing material was utilized. This testing shall be performed at the expense of the FAA. If asbestos-containing material is subsequently found during the sampling of the building materials, the Contractor shall remove and replace the product or material at his/her expense. In addition, the Contractor shall incur the costs of the original testing and/or any re-testing that may be necessary.

The Contractor shall submit to the CO Material Safety Data Sheets (MSDS), prior to construction, for all materials and/or products to be utilized during the course of the project accomplishment. During the course of the project, both the RE and the Contractor shall routinely check products utilized on-site to ensure only products that have had

MSDS submitted are utilized. Copies of all MSDS shall be turned over to the local FAA office for their records.

If the Contractor does not submit the required information described above, the FAA shall have a complete building survey performed by a qualified testing firm prior to acceptance. The cost of the survey and any subsequent removal/replacement of any asbestos-containing material shall be deducted from the Contractor's payment.

The contractor shall remove all containers of unused chemicals from the worksite upon completion of work, except where specified by the resident engineer.

1A.20 HAZARDOUS MATERIAL AND SAFETY:

Terne-coated metal roof solder contains LEAD. The contractor shall provide workers protection and training per OSHA 29 CFR 1926.62.

The contractor shall be responsible for safety on the work site. It is responsibility of the contractor to eliminate hazards that may result in tripping, electrical shock, fire, falling objects, environmental hazards, vehicular accidents etc. The contractor shall comply with all safety precautions required by OSHA. The contractor shall have two l5 lb. Class B and C fire extinguishers at the work area through the progress of welding, metal cutting, or any other process involving a spark or fire hazard.

Fall protection is required for work 6 feet and higher above ground level. Anchor points are available on the VOR roof area and should be used in conjunction with a full body harness.

DIVISION 2 – SITE WORK

SECTION 2A - EQUIPMENT REMOVAL

2A.1 SCOPE OF WORK: The fiberglass antenna shelter and azimuth positioner brackets shall be removed from the building roof preparatory to installation of the new single-ply membrane roof. The VOR antenna shall be removed. Remove all existing terne-coated metal pans, cleats, nails, rosin paper, and base felts from the existing wood deck and dispose of appropriately. The terne-coated metal pans contain lead and cannot be disposed of in a landfill. They must be recycled. The roof shall be temporarily covered using tarpaulin until new roof is installed and antenna shelter is reinstalled.

2A.2 TACAN ANTENNA REMOVAL:

The TACAN antenna system will be removed by the FAA from the antenna pedestal mounting support and placed in storage within the building.

2A.3 FIBERGLASS ANTENNA SHELTER REMOVAL:

A. The antenna shelter position shall be precisely indexed by scribe lines to the building roof before removal to assure reinstallation in the same relative position. The antenna shelter shall be removed as a unit.

B. In addition to the lag bolts holding the antenna shelter to the roof, waterproofing at the base was also incorporated in the original construction that may contribute to difficulty in removing the shelter. Such material includes a circular gasket under the antenna shelter, flashing material adhering to the roof and antenna shelter, and various caulking and sealing beads at the juncture between the roof and the base of the shelter. The waterproofing materials will have to be cut away from the antenna shelter using knives and flush-cut surface saws without causing any damage to the antenna shelter. All residue on the antenna shelter shall be removed carefully by scraping, sanding, and cleaning with a solvent. The antenna shelter shall be cleaned down to bare fiberglass.

C. Hoist cables shall be secured to the antenna shelter system before hold-down bolts are removed to prevent the shelter from being blown over in the wind.

Shelter shall be carefully hoisted in an approved manner from the building roof to temporary storage on grade. Place antenna shelter on wood blocking and boards of sufficient area such that the weight of the antenna shelter is distributed over at least 50 percent of the area of the base flange to preclude damage to the relatively brittle shelter.

D. Immediately after placement of the antenna shelter on grade, it shall be anchored with at least four guy wires or ropes and posts driven into the ground to preclude shelter from being blown over by wind. This precaution is emphasized due to its occurrence in the past at substantial cost for replacement. Contractor shall continuously monitor integrity of guy wires as needed.

E. Shelter Repair: See Division 10 for shelter refurbishment.

2A.4 AZIMUTH POSITIONER BRACKETS:

A. Subsequent to removal of 16 or more azimuth positioner brackets, the dipole antennas and connecting cables will be disconnected and removed by the

FAA. The antenna brackets consist of 5”x 5”-3/8”x 6” long aluminum angles fastened to the roof deck with four mechanical fasteners. Trapezoidal faceplates are attached to the azimuth positioner brackets that support the antennas by a wedging action. Sixteen of these azimuth positioner brackets will be reused.

B. The contractor shall set a transit over the building centerpoint and project a line through the center of the north azimuth positioner bracket to a mark on a wood hub driven flush with the ground approximately 200 feet north of the

VOR building. Guard the hub with a 1”x 2”x 5’ (approx.) wood stake with a red flag tied to the top of the stake. This work shall be performed with care and the resident engineer shall check and approve the reference point before the azimuth positioner brackets are to be removed. Upon installation of wood nailers around the perimeter of the roof, the transit shall be set up as previously, referenced to the wood hub, and reference lines scribed 22-1/2 0 apart near the edge of the roofing at each of the 16 bracket locations using the transit. After turning the transit scope 360 degrees, the cross hair must align precisely with the wood hub starting mark. The azimuth positioner brackets must be evenly spaced 22-1/2 0 on centers.

C. Each azimuth positioner bracket shall be covered with padding after it is installed to protect the tarpaulin roof covering from being punctured by the exposed sharp edges of the brackets during construction.

D. The azimuth positioner bracket bolt assemblies must be mortised into the wood nailers prior to installation of edge flashing and roofing material.

2A.5 PROTECTION OF ROOF DURING CONSTRUCTION: Temporary covering over the roof shall be provided until new roof is installed and antenna shelter has been reinstalled.

The temporary roof covering shall be the tarpaulin specified in this document that shall be supplied by the contractor.

DIVISION 6 – CARPENTRY

SECTION 6A – DECKING

6A.1 SCOPE OF WORK: After the old roofing has been removed, the contractor shall replace all deteriorated tongue and groove wood decking, wood framing, and fascia material as directed by the resident engineer. All surfaces of the VOR receiving soffit shall be furred with wolmanized furring strips of No. 2 construction grade lumber or better. For bidding purposes, the contractor shall assume replacement of 200 board feet of 2" x 6" tongue and groove decking. This amount of material shall be included in the contract bid. If more deteriorated wood has to be replaced than stated above it will be considered extra work and the contractor will be paid for his additional costs. If less than 200 board feet of material is used, the contractor shall reimburse the FAA for the savings in material and labor

6A.2 MATERIAL:

A. Lumber. Lumber shall be treated with preservative CCA such as “Osmose K-

3”, or wolmanized and dried after treatment. Retention of preservative shall not be less than .40 lbs of retained preservative per cubic foot of wood.

B. Decking. Decking shall be nominal 2” x 6” (or other standard width to match the thickness of the existing wood) tongue and groove treated wood. Exterior rated construction grade wood shall be used.

C. Furring strips shall be 2” x 4” (nominal) and shall be installed as shown on project drawings.

D. Nails: Nails for decking shall be 16 penny hot-dipped galvanized nails.

E. Fasteners: The wood nailers shall be attached to the existing decking with 302, 304, or 410 stainless steel fasteners or fasteners specially coated to be used in

CCA treated lumber as indicated in the drawings.

Furring strips shall be affixed to the existing nailers, fascia, and one to another utilizing 1/4"Ø x 2 1/2" Long “Zinc-Plated Steel” Lag Screws, McMASTER-

CARR Catalog Stock No. 91478A552 or equal.

6A.3 REPLACEMENT OF DAMAGED DECKING

A. All rotted or deteriorated tongue and groove decking, sleepers, joists, and wood fascia boards shall be replaced as directed by the resident engineer.

B. All joints shall fall on nailers.

C. If the repair in any area is more than one board wide, the length of repair boards shall be at least two spans long. When a tongue or a groove has to be trimmed to fit new boards, use construction adhesive to bond the new decking to the old along the full length of the joint.

D. Install 2" x 8" wood nailers around the counterpoise roof edge and 2" x 12" wood nailers to support the fiberglass antenna shelter as shown on the drawings.

DIVISION 7 – MOISTURE PROTECTION

SECTION 7A – EQUIPMENT PROTECTION

7A.1 SCOPE OF WORK: Provide a protective moisture barrier plastic cover over all electronic equipment, control panels, and power panels.

7A.2 MATERIAL:

A. Polyethylene film sheeting, six mils thick, transparent, and in width suitable to adequately cover the equipment.

B. Duct tape used to attach polyethylene film sheeting shall be waterproof sealing type.

7A.3 INSTALLATION: Carefully cover the equipment so that no water can enter the housing and damage the equipment. Equipment in service that generate heat and require ventilation shall have a wood frame constructed above the equipment and covered with polyethylene membrane. All temporary polyethylene covering shall be approved by the resident engineer.

7A.4 VAPOR BARRIER: See paragraph 10E.3.A for vapor barrier to be installed over wood deck after existing roofing materials have been removed.

SECTION 7B – OVERLAYMENT/RECOVER BOARD

7B.1 Scope of Work

Install Prime Dens Deck duraguard overlayment board 1/2” thick on the roof deck between the wood nailers at the outer roof perimeter and the wood nailers under the fiberglass antenna shelter. The overlayment board will not be installed inside the fiberglass antenna shelter; inside the shelter will have ½” treated plywood installed. The unsaturated polyester felt underlayment, 0.135 inches thick, or equal, shall be used inside the fiberglass antenna shelter over the plywood as a cushion for the roof membrane.

7B.2 Materials

Fasteners and insulation boards shall be approved by the membrane manufacturer.

1) Fasteners: Fasteners for attaching the Overlayment Board shall be "Buildex" Roof grip fasteners, #14 diameter with Climaseal coating or approved equal. Fasteners shall be 2" long.

2) Distribution Plates: The distribution plates shall be three inch diameter plastic plates manufactured by "Buildex", TRU FAST or approved equal. Metal distribution plates will not be allowed.

3) Overlayment Board: DensDeck® Prime

Fire-tested, gypsum hardboard with glass-mat facers and a pre-primed surface on one side. DensDeck Prime is provided in a 4 x 8 ft (1.2 x 2.4 m) board size and in thicknesses of 1/4, 1/2 and 5/8 inch (6, 13 and 16 mm). Consult Product Data Sheet for size, thickness and additional information.

7B.3 Installation

Install overlayment sheets using two inch long fasteners and distribution plates as specified in this document. The fastener pattern is shown on the drawings. A minimum of one fastener per two square feet will be required. Overlayment sheet joints shall not be wider than 1/8". When overlayment sheets are cut to fit irregular shapes, the board shall be cut to fit the desired shape accurately with true square edges.

SECTION 7B - SINGLE-PLY PVC ROOFING MEMBRANE

7B.1 Scope of Work

The work covered by Section 7B is for a fully adhered, 0.060 inch thick, single-ply Polyvinyl

Chloride (PVC) membrane with hot air welded seams.

7B.2 Materials:

1) Single-Ply Membrane:

Membrane shall be a fiberglass-reinforced flexible PVC sheeting, 0.060 inches thick, such as G 410 as manufactured by Sarnafil, Inc., or approved equal. PVC membrane used for flashing and roofing shall be fully adhered with hot air welded joints. Color shall be white. The proposal of another manufacturer's product requires the following: Membrane manufacturer's Catalog and Specification Data including descriptions and detailed application instructions, standard installation detail drawings, product characteristics, physical properties, a copy of the 10 year warranty and a list of 10 projects completed with the proposed product at least five years prior to the bid opening date. Only fiberglass-reinforced flexible PVC membrane, 0.060 inches thick, fully adhered systems will be considered.

2) Flashing Material:

a) Membrane coated flashing material shall be "Sarnaclad", G 410-L, 25 gauge galvanized steel, coated with a 0.02 inch thick coating of PVC film or approved equal. This material shall be used for edge flashing around the perimeter of the counterpoise roof and bottom retaining strip.

b) Flashing for the antenna supports within the fiberglass antenna shelter shall be made from Sarnafil, Inc. G 410 PVC membrane or approved equal.

3) Protection Mat:

CrossGrip shall be installed for the primary walkway and around the antenna shelter cone. Sarnafil SarnaTred polyester-reinforced PVC protection mat, or approved equal, shall be installed on the secondary walkway where shown on the project drawings to protect the roofing membrane in high traffic areas.

4) Adhesives:

a) Sarnafil Sarnacol 2170 solvent-based, elastomeric adhesive or approved equal shall be used to attach the membrane, Sarnafelt and Sarnatred protection mat to the substrates specified.

b) Sarnafil Sarnacol 2121 water-based dispersion adhesive or approved equal shall be used to apply a silica sand non-slip surface to the walkway membrane. This product must be protected from freezing.

5) Fasteners:

Any screws, nails or miscellaneous hardware for attaching flashing, ladder deck supports, etc., shall be 302, 304, or 18-8 stainless steel alloy. Any screws, fasteners, etc., to attach the treated wood nailers to the existing counterpoise deck shall be stainless steel or similar corrosion resistant fasteners designed to be used in treated wood as shown on the drawings.

7B.3 Caulking

Caulking to be used on the flashing and setting the A/C receptacle in the fiberglass antenna shelter, between the antenna shelter base gasket and the single-ply membrane and installing the ladder deck supports to the roof surface shall be chemically compatible with the PVC membrane.

The following caulking/sealants are accepted based on chemical compatibility with PVC membranes:

Monolastomeric, one-part acrylic, as manufactured by Tremco.

Silpurf, one-part silicone sealant, as manufactured by General Electric Company, or equal by Dow Corning.

GACO AS-3, one-part silicone sealant, as manufactured by Gates Engineering Company.

7B.4 Weather Limitations

Roofing or insulation materials shall not be applied until the ambient temperature is above 50 deg F with no signs or forecast for rain. Roofing materials shall not be applied when there is excessive moisture in the air causing wet or damp surfaces.

7B.5 Quality Assurance

1) Approved roofing system shall have a Class I-90 wind uplift rating.

2) Applicators shall be trained and qualified for installation of the approved roofing system.

3) The roofing contractor shall be a firm with a minimum of two years experience with the approved roofing system.

7B.6 Product Delivery and Storage

All products delivered to the site shall be in original unopened containers. Store membrane rolls lying down, fully protected from moisture. All stored materials shall be protected from damage during construction by the contractor.

7B.7 Membrane Installation

1) Inspection: The roofing contractor shall examine the surface scheduled to receive the membrane for defects that will adversely affect the execution and quality of work.

2) Preparation: The surface of the insulation and other surfaces to receive membrane shall be dry and free from dust or loose particles which would interfere in obtaining proper adequate bond.

3) Application:

a) Lap Seams Shingle Fashion: The VOR counterpoise roof slopes from the fiberglass antenna shelter to the outer edge in all directions. The contractor shall begin at the south edge of the counterpoise roof and lay the PVC membrane east-west towards the center of the roof and stop at when reaching the center. Then the contractor shall begin at the north edge of the counterpoise roof and lay the PVC membrane east-west working towards the center of the roof and finish up with a closure strip across the center. This will allow the roof to drain over the laps in a shingle fashion. All references to north-south and east-west are based on the azimuth positioner brackets which are set on magnetic bearings. The area within the fiberglass antenna shelter is 1 1/2" lower than the rest of the adjacent roof since there will be no insulation inside the shelter. A layer of Sarnafil Sarnafelt, or equal, shall be applied over this area prior to installing the PVC membrane. After the antenna shelter is reinstalled, the VOR antennas shall be replaced by the FAA and then the five pedestal antenna supports shall be flashed with PVC membrane. See the project drawings for details.

b) Fully Adhered Membrane: Carefully follow the PVC membrane manufacturer's instructions for using adhesive to install a fully adhered membrane system. The membrane shall be smooth and free from wrinkles, air bubbles, puckers, and similar irregularities which leave an unsightly appearance. Membrane laid that is not acceptable to the COTR shall be replaced or repaired in a manner that is acceptable to the COTR. The membrane shall be installed in straps as long as possible in order to minimize the number of end laps and short pieces.

c) Additional Wind Uplift Protection: The first seam from the north and south edge of the starting strip shall have a row of deck screws with plastic plates set on 12 inch centers prior to hot air welding the seams. The first four feet from the roof edge shall have deck screws with plastic plates set on 12 inch centers. See the project drawings for additional wind uplift fastener locations.

d) Joining Overlapped Roof Membrane: All joints shall be made by hot air welding with electric hot-air welding equipment meeting the membrane manufacturers approval. Lap areas shall be a minimum of 6 inches wide. No adhesive shall be present within the lap area. Machine welding shall be used on all seams where possible. Hand welding shall only be used where seams are not accessible for machine welding.

e) Machine Welding: Machine welding shall be achieved by the use of an automatic welding machine approved by the membrane manufacturer. When using this equipment, the manufacturer's instructions shall be followed and local code for the electric supply, grounding, and overcurrent protection observed. The automatic welding machine requires 218 to 230 volts at 30 amps. ( The use of a portable generator is recommended.)

f) Hand Welding: The equipment shall be allowed to warm up for at least one minute prior to the start of welding. The lap shall be welded every three feet to hold the material in place. The back edge of the lap shall be welded with a thin, continuous weld to prevent loss of hot air during the final welding. The hot-air nozzle shall be inserted into the lap, keeping the welding equipment at a 45 degree angle to the side lap. Once the proper welding temperature has been reached and the material starts to flow the hand roller shall be applied at a right angle to the welding bun and pressed lightly. For straight laps, the 1 1/2 inch wide nozzle shall be used.

For corners and compound connections, the 3/4 inch wide nozzle shall be used.

g) Roof Edge Flashing: The roof edge fascia flashing and bottom retaining strip shall be fabricated from Sarnafil Sarnaclad metal or approved equal. Flashing details are shown on the project drawings. The roof edge fascia flashing shall be attached to the solid wood nailers with two rows of #10 x 1 1/4 inch long annular ring stainless steel nails set 3 inches on center in a staggered pattern as shown on the drawing details.

The bottom retaining strip shall be attached with #10 x 1 inch stainless steel hex head sheet metal screws set 6 inches on centers.

7B.8 Weather Protection

When inclement weather forces a work stoppage or when the contractor leaves the work site at night, over weekends or any other time the roof shall be covered with the specified tarpaulin securely tied down and weighted with sand bags or similar means to prevent the wind from blowing the tarpaulin off. It shall be the responsibility of the contractor to insure the tarpaulin is leak free. Roofing materials damaged from wind or rain during construction shall be replaced at the contractor's expense.

7B.9 Field Quality Control

Test all welds for continuity by running a screwdriver along the membrane joints after cooling.

Reweld any discontinuities by and uninterrupted extrusion of melted black material from the joint.

SECTION 7C – APP MODIFIED ROOFING MEMBRANE

7C.1 Scope of Work

The work covered by Section 7C is for a fully adhered, two (2) ply APP Torch System. The following describes materials and general methods and conditions necessary for the proper application. Actual application requirements are the responsibility of the installer and should reflect the product used.

7C.2 Materials:

1) Granule surfaced - tough, resilient, asphalt modified bitumen membrane containing a core of non-woven polyester mat coated with weather resistant, APP polymer-modified asphalt. Conforms to or exceeds requirements of ASTM D6222 Type I

Grade G.

2) Flashing Material:

a) Granule surfaced - tough, resilient, asphalt modified bitumen membrane containing a core of non-woven polyester mat coated with weather resistant, APP polymer-modified asphalt. Conforms to or exceeds requirements of ASTM D6222

Type I Grade G.

b) Flashing for the antenna supports within the fiberglass antenna shelter shall be made from the same materials.

3) Protection Mat:

CrossGrip shall be installed for the primary walkway and around the antenna shelter cone. Sarnafil SarnaTred polyester-reinforced PVC protection mat, or approved equal, shall be installed on the secondary walkway where shown on the project drawings to protect the roofing membrane in high traffic areas.

4) Bitumen/Adhesives:

a) Asphalt Bitumen: ASTM D312 Type III or IV

b) Asphalt Primer: ASTM D41 Leakbuster™ Matrix 307 Premium Asphalt Primer, by GAFMC® or approved equal.

5) Fasteners:

Any screws, nails or miscellaneous hardware for attaching flashing, ladder deck supports, etc., shall be 302, 304, or 18-8 stainless steel alloy or galvanized. Any screws, fasteners, etc., to attach the treated wood nailers to the existing counterpoise deck shall be stainless steel or similar corrosion resistant fasteners designed to be used in treated wood as shown on the drawings. No plated fasteners allowed.

7C.3 Caulking

Caulking to be used on the flashing and setting the A/C receptacle in the fiberglass antenna shelter, between the antenna shelter base gasket and the APP membrane and installing the ladder deck supports to the roof surface shall be chemically compatible with the APP membrane. The following caulking/sealants are accepted based on chemical compatibility with APP membranes:

Flexible Seal by AP products or Geoseal 2300 for teepee seams and metal plate.

Marine grade silicone for bead of caulk under flange of teepee at roof.

Regular silicone elsewhere.

7C.4 Weather Limitations

Roofing or insulation materials shall not be applied until the ambient temperature is above 50 deg F with no signs or forecast for rain. Roofing materials shall not be applied when there is excessive moisture in the air causing wet or damp surfaces.

7C.5 Quality Assurance

1) Approved roofing system shall have a Class I-90 wind uplift rating.

2) Applicators shall be trained and qualified for installation of the approved roofing system.

3) The roofing contractor shall be a firm with a minimum of two years’ experience with the approved roofing system.

7C.6 Product Delivery and Storage

All products delivered to the site shall be in original unopened containers. Store membrane rolls lying down, fully protected from moisture. All stored materials shall be protected from damage during construction by the contractor.

7C.7 Membrane Installation

a) Gypsum decks must be smooth and free from deflections or ridges.

b) When installing base sheet fasteners, an average fastener withdrawal resistance as recommended by the fastener manufacturer must be obtained; however, at no time shall it be less than 40 lbs. (178 N) per fastener.

c) Wet or frozen poured gypsum decks are not suitable to receive a roof.

d) Poured-in-place gypsum roof decks contain…