SOW_MLT VOR Rehab.pdf

Project: Millinocket (MLT) VOR, Rehabilitation of VOR Shelter Building. (The VOR building is 36 ft. x 36 ft. x approximately 10 ft. high).

Location: Medway, ME 04460. Off of Pattagumpus Road (LAT/LONG 45.5866/-68.5154).

General: The Contractor shall provide all material, equipment (unless stated otherwise), supplies, transportation and labor to complete the specific scope of work. All work to be priced out in accordance with Davis-Bacon Wage Rates.

INTERIOR SHELTER Scope of Work: (See attached sketch of interior of building)

1.) Cover existing equipment racks and battery rack in equipment room with 16 mil plastic to prevent construction dust and debris from getting on and in equipment. These items will stay in place during the rehabilitation. Contractor shall ensure no cabling coming out of the racks or going between the racks are damaged.

2.) Remove all other existing cabinets, furniture, and equipment identified by the FAA from the equipment room and store in a storage container supplied by the contractor on site. All items removed shall be reinstalled and / or placed back in the equipment room after the completion of work.

3.) Remove and dispose of existing ceiling tiles and framing including lighting in equipment room (hatched area). All conduits, hangers for existing conduits, smoke/fire detectors, and any other items identified by the FAA shall be left in place and protected from damage that would be caused by removing the ceiling tile and framing. These items shall be removed and reinstalled if protection from damage cannot be accomplished. Any damage caused to these items shall be replaced and / or repaired at the discretion and approval of the FAA. If required the contractor shall reinstall any item to the underside of the roof decking. Ensure that method of attachment does not compromise the integrity of the roof.

4.) Remove and properly dispose all fiberglass insulation that is located above the drop ceiling.

5.) Install (spray) 4 inch depth of closed cell insulation foam to the underside of the roof decking above the ceiling tile. Any penetrations through the roof decking shall remain assessable after the insulation foam is installed. The contractor shall use an approved method to block such penetrations to prevent insulation foam from blocking them. The FAA will identify any abandon penetrations that do not have to be blocked.

6.) Install new 2ft x 2ft grid drop ceiling.

7.) Install 10 new 2ft x 2ft LED flat panel lights within the ceiling grid at approximate location of existing lights to utilize existing wiring. The 2ft x 2ft LED flat panel lights shall be 40W, 120- 277V, and 4400 lumens. The exact location of each light shall be field determined and approved by the FAA. Submittal required.

8.) Install non static carpet tile in equipment room (see attached equipment room layout, approx.

675 sq. ft. area, hatched area). Carpet tiles shall be butted up to all equipment racks, battery racks, and any other items that were not temporarily removed. See attached specifications.

9.) Repaint ceiling in engine generator room (approx. 290 sq. ft.) and storage/telco room (approx.

300 sq. ft.). The finish coat shall be a latex flat. The ceiling shall be scraped and properly prepped prior to painting. Any areas that have visible water stains shall be painted with a restoration paint (KILZ or approved equal) prior to the finish coat. Any equipment and or items not removed from the rooms shall be covered to protect them from paint spills / spatter.

10.) Replace existing incandescent light fixtures with new 2ft x 4ft surface mounted troffer lights with 2 x 18W LED T8 lamps, 4000 lumens, 4000K CCT, minimum 5 year warranty or approved equal (see attached specification sheet) in both the Engine Generator and Telco/Storage Rooms.

Three new lights per room for a total of six. Power from existing circuit.

11.) The contractor is responsible for any temporary lighting required to accomplish any / all work.

EXTERIOR SHELTER Scope of Work: (see attached drawing and photos of roof. The roof is 52ft-9in in diameter.

1.) Apply elastomeric cold fluid applied waterproof system (GACOFLEX™ S4200 WHITE ELASTOMERIC SILICONE ROOF COATING system or approved equal) on the entire surface of the roof of the VOR building. The existing fiberglass teepee and the antennas on the roof shall remain in place. The Contractor shall take care to not damage the fiberglass teepee or antennas or get any roof coating spills / drippings on the existing antennas. The new elastomeric roofing system shall be installed 6” up onto the tepee for the full perimeter. The contractor shall receive a Manufacturer’s 20 year System Warranty. Contractor shall follow procedures required by the manufacturer to receive the warranty (see attached specifications).

2.) An aggregate non-slip surface shall be installed as follows:

a. Four foot wide path from the access door of the fiberglass teepee to the outer perimeter edge of the roof.

b. Four foot wide path around the entire perimeter of roof that encompasses the area where the antennas are located.

c. To be installed per instructions in attached specifications. The exact location of the path shall be field determined and approved by the FAA.

3.) Existing Fascia and Soffit surfaces shall be scraped and repainted with restoration paint (KILZ or approved equal) 4.) Vinyl siding shall be installed on all exterior walls including fascia and soffit surfaces.

Manufacturer to be one of the following manufacturers or an approved equal: Monogram, Quest, or Mastic. See attached specifications.

5.) Replace three (3) existing 3ft exterior steel doors and hardware with like steel exterior doors and hardware. See attached specifications.

6.) See attached Paving / Stone Layout Sketch. The Contractor shall identify all existing utilities with assistance from FAA personnel before any excavation. Contractor shall be responsible for repairing/replacing any utilities damaged during excavation.

a. At areas indicated to be paved, remove existing earth material to a depth required to install subbase and asphalt surface.

b. Install 1 ft. of subbase gravel at hatched area for new paved areas. Subbase gravel to meet State of Maine Department of Transportation Standard Specifications (Section 300), revision of December 2002.

c. Install 2- 1 ½ inch courses of bituminous asphalt (total 3 in.). Asphalt mix shall meet State of Maine Department of Transportation Standard Specifications (Section 400), revision of December 2002:

i. 1 ½ in. base course

ii. 1 ½ in. finish course

d. At areas indicated on sketch to be stoned: Remove existing earth material to a depth of 6 inches and install 6-inch deep of ¾ inch crushed stone ten (10) feet beyond the exterior of the building and the existing propane tank in all directions as indicated on sketch. Geotextile fabric shall be installed under the entire surface of stone installed.

General Notes / Execution:

• Informational submittals required for all products.

• Adhere to all manufacturer’s instructions / recommendations for all products.

• All work to be performed Monday through Friday between the hours of 07:00 AM to 4:00 PM or as otherwise coordinated with COR.

• FAA will provide escort at all times.

• All work subject to the following provisions for Operational Risk Avoidance and Safety:

a. Operational Risk Avoidance:

1) The contractor shall NOT begin to perform any work until FAA personnel has taken the facility out of service and informs the contractor that work can commence.

Coordination of Work Affecting Operational Systems or Personnel. Coordinate all work that has any or may have any impact on any operational systems through the COR.

Cease any work that is adversely impacting the operations of any facility and immediately repair or restore any portion of an operational system that has been damaged or suffered diminished performance as a result of the Contractor’s activities.

2) Avoid actions deemed detrimental or increasing risk to any facility’s mission or equipment.

3) Avoid activities that create objectionable noise, release detectable odors, or generate smoke.

4) Avoid activities that raise temperature or decrease air volume in electronic equipment spaces, electrical equipment spaces and other areas that would suffer potential failures or reduced performance from such changes.

5) Avoid activities that change temperature or air volume in occupied spaces to the maximum extent possible.

6) All space temperature and air volume changes must be scheduled and approved in advance by the COR.

7) Circuit Breakers. Circuit breakers and disconnect switches will be operated by FAA personnel only. Contractor personnel must not operate circuit breakers or any other electrical disconnecting device. FAA will lockout / tag out equipment to insure personnel safety while safeguarding facility operations.

b. Safety:

1) Perform all work safely and in accordance with the following requirements.

2) Comply with FAA Electrical Standards, FAA Safety Standards, National Electrical Code, National Fire Code, OSHA, manufacturer’s recommendations, local, state, and federal regulations, other authorities having jurisdiction, and local facility.

3) Workers must use Personal Protective Equipment (PPE) as required by code, regulation, standard, or manufacturer’s recommendation.

Attachments:

1. Building Interior Layout sketch

2. Non Static Carpet Tile Specifications

a. Section 09 68 13.10 – Conductive Tile Carpeting

3. LED lighting spec sheet

4. VOR Roof Plan and Profile Drawing (NE-D-2743-001)

5. Cold Fluid Applied Waterproofing System Specifications/Installation Instructions.

a. BGR 07 56 00 Fluid-Applied Roofing Sikalastic-641 Lo VOC

6. Vinyl Siding Specifications

7. Exterior Steel Door Specifications

a. 08 39 54 Blast Resistant Doors

b. 08 71 00 Door Hardware

8. Paving and Stone Layout

9. Photos of VOR facility

a. Photo back of VOR bldg.

b. Photo Engine Generator ceiling

c. Photo equipment room view from door

d. Photo equipment room

e. Photo front of VOR bldg.

f. Photo other side of VOR bldg.

g. Photo side of VOR bldg.

h. Photo telco storage room ceiling

i. Photo telco storage room

j. Photo VOR roof

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Housing Lightweight aluminum housing

Finish Formulated for high durability and long-lasting color

Driver Constant Current, Class 2, 120-277V, 50/60 Hz (1x4) 25W: 0.22A @ 120V; 0.13A @ 208V, 0.11A @ 240V, 0.10A @ 277V 30W: 0.26A @ 120V; 0.15A @ 208V, 0.13A @ 240V, 0.12A @ 277V 40W: 0.33A @ 120V; 0.19A @ 208V, 0.17A @ 240V, 0.15A @ 277V (2x2) 25W: 0.22A @ 120V; 0.13A @ 208V, 0.11A @ 240V, 0.10A @ 277V 30W: 0.25A @ 120V; 0.15A @ 208V, 0.13A @ 240V, 0.12A @ 277V 40W: 0.33A @ 120V; 0.19A @ 208V, 0.17A @ 240V, 0.15A @ 277V (2x4) 30W: 0.26A @ 120V; 0.15A @ 208V, 0.13A @ 240V, 0.12A @ 277V 40W: 0.34A @ 120V; 0.20A @ 208V, 0.17A @ 240V, 0.15A @ 277V 50W: 0.42A @ 120V; 0.24A @ 208V, 0.21A @ 240V, 0.18A @ 277V

Replaces up to:

Dimensions

EZPAN® FA 2X2

Weight: 7.1 lbs.

EZPAN® FA 2X4

Weight: 13.4 lbs.

EZPAN® FA 1X4

Weight: 7.1 lbs.

47 3/4"

45 3/8"

22 1/2" 23 3/4"

5/16

1 5/8"

8 5/8"

3 3/8"

47 3/4"

45 3/8"

22 1/2" 23 3/4"

5/16

1 5/8"

8 5/8"

3 3/8"

47 3/4"

45 3/8"

22 1/2" 23 3/4"

5/16

1 5/8"

8 5/8"

3 3/8"

23 3/4"

21 3/8"

23 3/4"21 3/8"

5/16"

1 5/8"

8 5/8"

3 3/8"

3'11 3/4"

11.93"

3'9"

10"

11/32"

2"

8 5/8”

3"

Surface Mounting Kits SMKEZPAN - 1X4 Surface Mounting Kit

SMEKZPAN - 2X2 Surface Mounting Kit

SMKEZPAN - 2X4 Surface Mounting Kit

Pendant Mounting Kits PMKEZPAN - 1X4 Pendant Mounting Kit

PMKEZPAN - 2X2 Pendant Mounting Kit

PMKEZPAN - 2X4 Pendant Mounting Kit

Recessed Drywall Mounting Kits RMKPANEL - 1X4 Recessed Mounting Kit

RMKPANEL - 2X2 Recessed Mounting Kit

RMKPANEL - 2X4 Recessed Mounting Kit

Mounting Kits

Surface mount kit

EZPAN

(not included)

EZPAN

(not included)

Recessed Mounting Kit

Pendant mount kit

EZPAN

(not included)

Performance data is based on test performed at 120V.

Performance

Product

Product

Product

Surface Mount Kit

Pendant Mount Kit

Recessed Mount Kit

Size

Size

Size

SMKEZPAN

PMKEZPAN

RMKPANEL

Ordering Matrix

Lumens Efficacy (lm/W) Color Accuracy (CRI)

Lumens Efficacy (lm/W) Color Accuracy (CRI)

Lumens Efficacy (lm/W) Color Accuracy (CRI)

3500K 4000K 5000K

3500K 4000K 5000K

3500K 4000K 5000K

3500K 3500K 3500K4000K 4000K 4000K5000K 5000K 5000K

25W

3500K 4000K 5000K

30W

30W 40W

25W 30W 40W

1 x 4

2 x 4

2 x 2

3500K 4000K 5000K

40W 3500K 4000K 5000K

50W

2X4 2' X 4' 2X2 2' X 2' 1X4 1' X 4'

/D10 0-10V dimming, 120-277V Blank

/LC

/LCS

No options Lightcloud Controller

Lightcloud Sensor Battery Backup

Product Size Voltage Options

EZPANFA /D10

2X4 2' X 4' 2X2 2' X 2' 1X4 1' X 4'

2X4 2' X 4' 2X2 2' X 2' 1X4 1' X 4'

2X4 2' X 4' 2X2 2' X 2' 1X4 1' X 4'

/E2

Available with Lightcloud® controls.

Lightcloud is a commercial wireless lighting control system and service, fully developed and supported by RAB.

• Use your mobile device, tablet or computer for switching and dimming of individual fixtures or entire areas

• Complimentary rebate assistance and lighting design services

• Programmable schedules let you illuminate zones, automatically adjusting for sunrise and sunset times

• Save up to 68% on energy costs from lighting

Gaco.com ｜ 800-331-0196

Application Specification: ASP-S4200-34-20 Revised: 01/2024

DIVISION 07 01 50.61:

GACOFLEX™ S4200 WHITE ELASTOMERIC SILICONE ROOF COATING

FOR RESTORING MODIFIED BITUMEN AND SMOOTH BUILT-UP ROOFING

MEMBRANE ASSEMBLIES

PART 1 – GENERAL

1.1 SUMMARY

A. This specification provides a remedial roof coating for application over existing smooth and granule-surfaced modified bitumen and smooth built-up roofing membranes (BUR), including mineral surfaced cap sheets (but excluding gravel-surfaced built-up roofs). Application is restricted to circumstances in which the membrane substrate is in sound condition but requires a renewal of the surface due to the normal effects of aging and use.

NOTE: This specification only includes GacoFlex S4200 White Elastomeric Silicone Roof Coating. Non-white (i.e., colored) silicones are not approved for use on asphalt substrates.

When properly applied, the GacoFlex S4200 White Elastomeric Silicone Roof Coating provides a weathertight membrane that protects the substrate from degradation caused by ultraviolet light (UV), water, and other normal weathering hazards. The substrate should have at least a 0.25 in (6.4 mm) slope per foot to promote positive drainage.

B. The GacoFlex S4200 White Elastomeric Silicone Roof Coating discussed in this specification has a moderate rate of water vapor transmission and is not recommended for use on cold storage or cryogenic structures that may have constant high-water vapor drive causing long-term accumulation of moisture in the roofing system that serves as a substrate for the GacoFlex S4200 White Elastomeric Silicone Roof Coating.

C. This specification is intended only as a guide for the development of a project specification. The suitability of this specification for a particular project must be determined by a qualified representative of the owner.

Conditions to check and corrections to consider are:

• The type of pre-existing system must be identified.

• All pre-existing membranes must be fully adhered or mechanically attached and intact.

• The structural decking must be sound.

Elements of this specification may require modification in order to clearly delineate project requirements.

Sections that are not pertinent may be deleted.

D. Adhesion tests are strongly recommended prior to bidding. A Coating Applicator that is licensed by the product manufacturer should perform wet and dry adhesion tests as instructed in GacoFlex General Instructions GW-1-3 Adhesion Testing Procedures using the products listed in Section 2.2.

1.2 RELATED SECTIONS

A. Cast-In-Place Concrete: Division 03 30 00 F. Vapor /Air Barriers: Division 07 25 00

B. Flashing/Sheet Metal: Division 07 60 00 G. Board Insulation: Division 07 22 00

C. Roof Accessories: Division 07 72 00 H. Skylights: Division 08 60 00

D. Rough Carpentry/Wood Blocking: Division 06 10 00 I. Metal Decking: Division 05 30 00

E. Drains, Vents and Penetrations: Division 22 14 26.13

1.3 SUBMITTALS

A. PRODUCT DATA:

Submit manufacturer’s standard submittal package including specification, installation instructions and general information for each waterproofing material.

ASP-S4200-34-20

B. APPLICATOR QUALIFICATIONS:

Submit current Letter of Good Standing from the specified waterproofing manufacturer.

C. SUBSTRATE CONDITIONS:

1. Applicator to present to owner a completed inspection report verifying substrate condition and any noted defects not specifically addressed in regard to the installation of the coating.

2. Surface shall be free from loose dirt, stone, debris, moisture, and shall be in stable condition. Any work on the area to receive this application shall be completed prior to the installation of the coating.

3. Applicator shall complete a substrate inspection prior to the start of the installation of the coating.

The architect/owner and Applicator shall accept the substrate. Start of the work constitutes acceptance.

1.4 QUALIFICATIONS

A. Primary waterproofing materials shall be the products of a single manufacturer. Secondary materials shall be recommended by the primary manufacturer. The manufacturer shall have a minimum of ten (10) years’ experience in the manufacture of materials of this type.

B. Applicators shall have a minimum of five (5) years’ experience in the application of waterproofing materials of the type specified. The Applicator shall possess a current Letter of Good Standing from the specified waterproofing manufacturer.

C. PRE-BID CONFERENCE:

Ten (10) working days prior to the bid opening there is to be a mandatory Pre-Bid Conference. Those not attending the Pre-Bid Conference will not be allowed to bid the project. All products considered an equal to the specified product or any changes in the scope of work, installation, or specifications must be presented at the Pre-Bid Conference. If a change in the specifications is accepted, it will be considered as an alternate and will be presented as a bid addendum issued five (5) working days prior to the bid opening. No other changes to the specification or bid documents will be accepted.

D. Materials other than those specified shall be submitted to the architect/owner for approval no later than ten

(10) days prior to the bid date. In requesting prior approval, it shall be necessary to submit:

1. A letter of certification, signed by an officer of the manufacturer, stating that the alternate material is equal to or better than the specified product.

2. Independent laboratory test data giving physical property values in comparison to the specified material.

E. PRE-INSTALLATION CONFERENCE:

Just prior to the commencement of the installation, meet at the jobsite with a representative of the coating manufacturer, Applicator, general contractor, architect, and other parties affected by this section. Review the methods and procedures, substrate conditions, scheduling, and safety.

1.5 DELIVERY, STORAGE AND HANDLING

A. Owner/owner’s representative shall reject damaged or non-conforming materials. Rejected materials must be removed immediately from the job site.

B. Store the coating materials as recommended by the manufacturer and conforming to applicable safety regulatory agencies: town or city, state, and federal. Refer to all applicable data including, but not limited to:

Safety Data Sheets, Product Data Sheets, product labels, and specific instructions for personal protection.

C. Provide adequate ventilation, protection from hazardous fumes, and overspray potential to workers and associated trades in close proximity of the site application.

1.6 WARRANTY

A. Manufacturer warrants that the material supplied will meet or exceed physical properties as published. The Applicator guarantees that workmanship will be free of defects in coating application. Since performance of previously applied coatings is beyond the control of Manufacturer and Applicator, requests for additional warranty coverage shall be subject to prior approval by Manufacturer.

B. A TWENTY (20) YEAR LABOR AND MATERIAL WARRANTY MUST BE OBTAINED THROUGH THE

MANUFACTURER.

C. PROTECTION OF BUILDING AND OCCUPANTS:

1. All surfaces not to receive the coating specified shall be protected from overspray hazard, e.g., windows, doors, exterior surfaces and facades, parking lots, and vehicles. Protective coverings shall be secured against wind and shall be vented if used in conjunction with applications preventing collection and moisture.

2. Applicator to post signs noting potential overspray hazard within 400 ft (121.90 m) of applications.

3. All air intake ventilation equipment shall be turned off to prevent fumes from entering building.

4. Surfaces damaged during application shall be restored at no expense to the owner.

5. No smoking signs to be posted as mandated by local fire officials.

D. SUBSTRATE:

Proceed with work as specified only after substrate construction, preparation, and detail work has been completed.

E. EQUIPMENT:

All equipment used during operations shall be located so as not to adversely affect the daily operations or endanger occupants, structure, or materials on-site. All spray equipment must be grounded during operations.

PART 2 – PRODUCTS

2.1 MANUFACTURERS

ACCEPTABLE MANUFACTURERS:

Gaco, www.gaco.com – Manufactured by Holcim Solutions and Products US, LLC

Other brands manufactured by Holcim Solutions and Products US, LLC as noted.

2.2 MATERIALS

A. BLEED BLOCKER:

GacoFlex A4271 BleedTrap™ Base Coat (as needed)

B. SACRIFICIAL TAPE:

ScotchBlue™ ORIGINAL Painter’s Tape or equivalent (as needed)

C. PRIMER:

GacoFlex E5320 2-Part Epoxy Primer/Filler (as needed)

D. FLASHING:

1. GacoFlex 66S Reinforcing Polyester Mesh

2. GacoFlex SF4200 SeamSeal

3. GacoPatch™ Silicone Roof Sealant

4. GacoFlex UF9022 – GacoMastic™

5. ERsystems® H.E.R.

E. SILICONE COATING:

GacoFlex S4200 White Elastomeric Silicone Roof Coating has the following physical properties:

GacoFlex S4200 - WHITE | Elastomeric Silicone Roof Coating

PROPERTY VALUE TEST METHOD

TENSILE STRENGTH 275 psi (1.9 MPa) ASTM D2370

ELONGATION 196 % ASTM D2370

SOLIDS CONTENT

96.5 % (By Weight) 95 % (By Volume)

ASTM D1644

ASTM D2697

VOC < 50 g / L EPA Method 24

REFLECTANCE

Initial: 0.87

After Soiling: 0.81

ASTM C1549

S4200 White

WATER VAPOR

PERMEABILITY

6.4 Perms ASTM E96-B

PART 3 – EXECUTION

3.1 EXAMINATION

A. A nuclear or infrared scan must be performed and any wet roofing materials must be removed and replaced.

B. Repair to the structural components of the roof should be completed.

C. Verify that the drains, vents, ducts, gutters, metal cap flashing or other penetrations have been replaced or modified.

3.2 PREPARATION

NOTE: It is extremely important for the roof to be clean and dry.

A. Asphalt substrates shall be prepared by mechanically brushing away loose dirt, debris and granules, and removing via a power broom and/or industrial vacuum. The roof surface must be clean and completely dry, especially in areas of ponding water.

NOTE: For previously coated asphalt substrates, please contact Technical Services.

B. BIOLOGICAL CONTROL:

Areas of algae, mildew or fungus on the roofing membrane should be treated with a solution of 1-part household bleach to 3-parts water, followed by a power washer rinse using clear water. After cleaning, examine the application area to determine that no ponding or standing water remains before applying the coating.

NOTE: WITH THE EXCEPTION OF CLEANING TO REMOVE BIOLOGICAL RESIDUE, DO NOT WASH

THE ASPHALT ROOFING SUBSTRATE – INCLUDING PRESSURE WASHING AND THE USE OF

CLEANERS – EXCEPT AT THE DIRECTION OF TECHNICAL SERVICES.

3.3 INSTALLATION

A. TECHNICAL ADVICE:

The installation of this system shall be accomplished with the advice of, the manufacturer’s technical representative. Contact Technical Services for assistance.

B. REPAIRS:

1. Inspect the roofing system for open field seams, open side laps, open flashings, or voids and perform repairs using granule surfaced APP membrane that is torch-applied or heat fused, regardless of the existing asphalt membrane type. Fish mouths should be cut and allowed to lie flat prior to repair.

2. Areas of delaminated, warped, bowed, or saturated insulation must be removed down to the structural decking, replaced with compatible materials and appropriately attached. The roofing membrane should be repaired using granule surfaced APP membrane that is torch-applied or heat fused, regardless of the existing asphalt membrane type.

3. Repair or replace defective edge attachments or base tie-ins and wall or penetration flashings using granule surfaced APP membrane that is torch-applied or heat fused, regardless of the existing asphalt membrane type.

4. Remove defective pitch pan filler, metal flashing sealants or termination caulking and replace with appropriate materials.

NOTE: Only torch-applied or heat fused granule surfaced APP membrane may be used for repairs to the asphalt roofing substrate prior to installation of the GacoFlex coating, regardless of the existing asphalt membrane type. Do not use SBS, smooth APP or self-adhering membranes. Do not use asphalt mastics or cold adhesives as part of remedial roof repairs.

NOTE: All areas repaired with new granule surfaced APP membrane must be coated with two (2) applications of A4271 BleedTrap Base Coat prior to the installation of the GacoFlex coating.

C. BLEED BLOCKER:

BleedTrap may be brushed, rolled, or spray applied at an approximate rate of 1 gal / 100 ft² (3.79 L / 9.29 m²). Additional material may be required over rough or granular surfaces. A continuous Dry Film Thickness (DFT) of 6 mil is important to help prevent the migration of oils to the surface. See Product Data Sheet for specific application instructions.

NOTE: For granular or rough surfaces, more material may be needed to achieve the required mil thicknesses.

NOTE: Manufacturer’s warranty does not cover discoloration or blistering of GacoFlex S4200 White Elastomeric Silicone Roof Coating caused by oil migration or “off-gassing,” so BleedTrap is strongly recommended over APP, Smooth BUR, and Mineral Surface Cap Sheets. BleedTrap is required over all SBS roofing substrates. For previously coated asphalt substrates, contact Technical Services for BleedTrap requirements.

D. PRIMER:

If adhesion testing indicated the need for a primer, apply GacoFlex E5320 2-Part Epoxy Primer/Filler at an approximate rate of 1 gal / 600 – 800 ft² (3.8 L / 55.7 – 74.3 m²) to produce a minimum Dry Film Thickness (DFT) of 1-2 mil. Do not over-apply. When properly mixed and applied, E5320 Primer should remain a translucent pink color in its cured state. Spray application of E5320 Primer (i.e., a non-continuous dusting) is preferred to achieve the required coverage rate, but roller application using a ¼ in (6.4 mm) to ⅜ in (9.5 mm) nap roller or nylon brush is permitted. Allow E5320 Primer to cure for a minimum of 6 hours (longer in overcast or humid conditions) before the application of the GacoFlex S4200 Silicone Roof Coating.

NOTE: For granular or rough surfaces, more material may be needed to achieve the required mil thicknesses.

E. AT ALL FLASHING SEAMS, CORNERS, AND VERTICAL/SIDE LAPS, CHOOSE ONE OF THE

FOLLOWING:

1. Apply GacoFlex S4200 White Elastomeric Silicone Roof Coating by brush or roller at a minimum width of 6 in (152 mm) centered on the seam at minimum rate of 1.5 gal / 100 ft² (5.75 L / 9.25 m²) to obtain a Wet Film Thickness (WFT) of 24 mils (approx. 200 LF / gal). Immediately embed a 4 in (102 mm) strip GacoFlex 66S Reinforcing Polyester Mesh into the wet coating until the Polyester Mesh is completely saturated. The Polyester Mesh must be smoothly applied without wrinkles, “fish mouths,” blisters, or pin holes. Once the Coating with embedded Polyester Mesh is firm to the touch, apply another coat of GacoFlex S4200 White Elastomeric Silicone Roof Coating at a minimum rate of 1.5 gal / 100 ft² (5.75 L / 9.3 m²) to completely encapsulate the Polyester Mesh.

Allow to cure for a minimum of 24 hours (longer in overcast or low humidity conditions) before applying a top coat of GacoFlex S4200 Silicone Roof Coating.

2. Apply GacoFlex SF4200 SeamSeal applied at a minimum of 4 in (102 mm) wide, crested and centered at the seam, with a minimum thickness at the center of 64 wet mils (approx. 70 LF / gal).

Allow to cure for a minimum of 4 hours (longer in overcast or low humidity conditions) before applying a top coat of GacoFlex S4200 White Elastomeric Silicone Roof Coating.

3. Apply sacrificial tape ScotchBlue™ ORIGINAL Painter’s Tape (or equivalent) as required. Apply GacoPatch Silicone Roof Sealant at a minimum of 4 in (102 mm) wide, crested and centered at the seam, with a minimum thickness at the center of 64 wet mils (approx. 70 LF / gal). Allow to cure for a minimum of 4 hours (longer in overcast or low humidity conditions) before applying a top coat of GacoFlex S4200 White Elastomeric Silicone Roof Coating.

4. Apply sacrificial tape ScotchBlue™ ORIGINAL Painter’s Tape (or equivalent) as required. Apply GacoFlex UF9022 – GacoMastic at the approximate rate of 70 LF / gal and 4 in (102 mm) wide, crested and centered at the seam. Achieve an average minimum WFT of 64 mils when measured at center at all areas to receive flashing. Allow to dry a minimum of forty (40) hours at 75 °F (24 °C) and 55 % R.H. to achieve full cure. Low humidity and low temperature will result in longer cure times.

5. Apply ERSystems H.E.R. Sealant at the approximate rate of 70 LF / gal and 4 in (102 mm) wide, crested and centered at the seam. Achieve an average minimum WFT of 64 mils when measured at center at all areas to receive flashing. Allow to dry a minimum of twelve (12) to twenty-four (24) hours at 75 °F (23.9 °C) and 45 % R.H. Weather related conditions such as frost, dew, mist, condensation, humidity, and temperature must be taken into consideration prior to coating.

Temperature should be above 40 °F (4.45 °C) more than 5 °F (2.8 °C) above the dew point and rising, for best application results.

NOTE: Refer to manufacturer’s product instructions and/or data sheet for important information regarding drying times and other important factors to consider regarding application.

F. HVAC / ELECTRICAL:

Existing HVAC Units and other equipment on curbs with a membrane flashing: The membrane flashing must be coated up to the bottom of the metal cap of the unit and sealed underneath with a 100 % silicone sealant.

Curbs must be a minimum of 8 in (203 mm) above the roofing membrane.

G. SLEEPERS:

Any units that are sitting on sleepers must be lifted so that the membrane underneath the units can be cleaned, primed and coated. An approved slip sheet must be placed under the sleepers to protect the coating. If the units are not lifted off the deck so as to be able to accomplish this procedure, the untreated area will be excluded from the manufacturer’s warranty.

H. SILICONE COATING:

Apply one (1) coat of GacoFlex S4200 White Elastomeric Silicone Roof Coating at the average rate of 2.25 gal / 100 ft² (8.5 L / 9.3 m²) to obtain 36 mil Wet Film Thickness (WFT) / 34 mil Dry Film Thickness (DFT).

Coat all surfaces including expansion joint covers and flashings. At all edges and penetrations, an extra pass must be applied.

NOTE: For granular or rough surfaces, more material may be needed to achieve the required mil thicknesses.

NOTE: Unlike single ply membranes, modified bitumen and built-up roofs have varying degrees of cracks in the surface of the asphalt and bleed out at the seams. With this application it is highly recommended that a test patch be installed to determine how much coating will be needed because asphalt roof surface profiles vary due to weathering and other factors.

I. GRANULAR COAT (OPTIONAL):

An additional granular coat may be added. Apply one coat of GacoFlex S4200 Silicone Roof Coating at a minimum of 0.5 gal / 100ft² (1.9 L / 9.25 m²) for 8 mils DFT. Immediately broadcast white roofing granules into finish coat at the rate of 30 lb / 100 ft² (13.6 kg / 9.25 m²).

J. WALKPAD (OPTIONAL):

***THESE INSTRUCTIONS APPLY TO APP AND BUR(S) MEMBRANES ONLY

Apply one coat of GacoFlex SF4236 WalkPad at a rate of 4 gal / 100 ft² (15.2 L / 9.25 m²) to obtain 64 mil WFT. Immediately broadcast GacoWalkPad safety yellow granules into wet coating at a rate of 0.5 lb / 100 ft² (0.23 kg / 9.25 m²) improve traction.

NOTE: Tape off WalkPad area using duct tape. Remove duct tape while coating is still wet.

NOTE: GacoFlex WalkPad SF4236 is the only walk pad system approved for use with GacoFlex S4200 Silicone Roof Coating. However, WalkPad may not be used on coated SBS roofing membranes.

CAUTION: While the use of granules will improve traction, caution should still be exercised when walking on the coated roofing system, especially in wet conditions.

3.4 FIELD QUALITY CONTROL

A. Any variations from the specified limits found by the Applicator or owner’s representative shall be corrected by the Applicator.

B. MINIMUM DRY FILM THICKNESS (DFT) REQUIREMENT:

Gaco recommends adding a 10 % variance factor to meet the minimum Dry Film Thickness (DFT) mil requirement to qualify as a warrantable application. It is the Applicator’s responsibility to calculate the amount of coating needed to obtain the minimum Dry Film Thickness (DFT) mil thickness.

C. No traffic shall be permitted on the coated surface for a minimum of three (3) days. Damage to the surface by other trades shall not be the responsibility of the Applicator.

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