ATTACHMENT 1 STATEMENT OF WORK.pdf

American Samoa Observatory Roof Removal and Replacement

Statement of Work (SOW)

Narrative Including Base Contract Requirements

Optional Line Items

Summary:

The National Oceanic and Atmospheric Administration (NOAA) Global Monitoring Laboratory (GML) operates a year-round long-term atmospheric research facility on Cape Matatula, American Samoa. The American Samoa Atmospheric Baseline Observatory (SMO) is one of NOAA’s four atmospheric baseline observatories worldwide and monitors the composition of air flowing off the Pacific Ocean. Sitting on a 26.7-acre parcel of land, the observatory hosts a number of complementary atmospheric research projects from universities, federal agencies, and foreign research groups.

Logistically, a 0.5 mile paved asphalt private road connects the main road (Route 1 in the village of Tula) with the observatory facility. Following the contours of the hillside, it is a narrow road with many twists and steep hills. The driveway can be challenging for longer vehicles due to the narrow width, rolling topography, and occasional sharp corners. All Wheel Drive and Four Wheel Drive vehicles are recommended for accessing the observatory, especially when the roads are wet from rain storms. The power lines do cross over the road in multiple locations along the driveway and may pose an overhead obstruction issue for very tall vehicles (no known issues with the powerlines obstructing access to the site historically). Trees and dense vegetation may also pose an overhead obstruction for the tallest vehicles and/or vehicles that are extra wide.

All cargo coming into/out of American Samoa is via ship or aircraft. The port is located in Pago Pago, approximately 45 minutes from the SMO site. The airport is located in Tafuna, approximately 60-80 minutes from SMO. Most hotels, stores, and services are located near Pago Pago and Tafuna. Few stores on the island stock construction supplies and their inventory is highly variable. It is likely that all materials for the project will need to be shipped to American Samoa in advance of construction work starting. Materials can be staged under the carport from arrival on island until installation. Additional or alternate staging locations can be coordinated with NOAA around the perimeter of the main observatory.

Located on an island in the South Pacific Ocean, the observatory is located in a highly corrosive environment. The island receives frequent, heavy rainfall (approx. 200 inches of rain annually) and averages around 80 degrees F (26.7 C). The high humidity and salt spray from the ocean expedite corrosion, making high quality building materials, corrosion-resisting treatments, and regular maintenance necessary. In addition, American Samoa is located in an active tectonic region, experiencing earthquakes and tsunamis, and is regularly in the path of tropical storms, requiring adherence to the latest building technology and regulations (seismic, wind, etc.).

The main American Samoa Observatory building was constructed in 1973 to house scientific instruments and provide office space for NOAA staff members. The building is 17’4” wide by 81’ 4” ft long and constructed out of cement blocks. The building was renovated in 2005, including the installation of a new roof. The roof is a standing seam metal roof covering ~75% of the building and the remaining 25% has a flat EPDM rubber roof section supporting a round ~10.5 ft diameter instrument shelter and dome.

Additional interior renovations were completed in 2009 following a major earthquake and tsunami to make the site safer and more resilient during earthquakes. The observatory has a kitchenette break area with a refrigerator and microwave and a bathroom that will be made accessible to the vendor’s team when they are on site (during business hours only).

The current roof has 4 main components: a metal roof with an instrumented catwalk installed at its peak, a nearly-flat EPDM roof supporting a 10.5 ft diameter instrument dome, an carport attached to the northern side of the building that also supports a solar photovoltaic system, and the gutter system that collects rainwater in a buried cistern for the observatory’s gray water system.

● Metal roof condition: There is significant corrosion on the current roof system that originated at the gutter edges of the roof panels and has moved inward on the roofing material over time. The roof supports an instrumented metal catwalk. The catwalk itself has electrical outlets spaced out along its length. Beneath the catwalk are pass-throughs for cables to route from the roof and catwalk, into the laboratory rooms.

● Rubber roof condition: This portion of the roof is nearly flat, and has consistent water ponding problems from not being sloped appropriately toward the water drains around the roof’s edges.

This roof gets heavy foot traffic on a daily basis and must not pose a slip or trip hazard to staff and visitors. In the middle of the flat rubber roof is a circular instrument shelter and dome. The entire dome and supporting wall structure will be replaced concurrently with this roof replacement.

● Carport condition: The corrugated metal carport roof is due for replacement. It supports the observatory’s solar panel array and covers the main entrance of the observatory building. It currently has holes and significantly leaks water during rain events.

● Gutter Condition: The metal roof’s gutters and downspouts drain into the water tank used on the station’s (non-potable) gray water system. The gutters and downspouts have nearly corroded through and are past their useful lifespan.

The current standing seam metal roof, installed in 2005, has deteriorated significantly in the last ~18-years. NOAA has discovered that a major issue with this particular roofing design is that no vendors or materials are available on the island to do repair work on this specialized metal roof style. 99% of the buildings on the island with metal roofs use corrugated metal panel products. As such, this solicitation encourages the use of roofing panels that are familiar to local contractors and possibly available in local stores (limited supplies) for future repairs should any be needed. Moving to a roofing style and material that is congruent with the other buildings on the island and one that will last as long as possible in the harsh tropical environment of American Samoa is highly-desirable.

Scientific measurements obtained at SMO often represent the global background conditions for the atmospheric research community. As such, the measurements taken at the site are highly precise and need to be safeguarded to ensure that indoor room air and/or local site contamination does note negatively impact the long-term records. NOAA has developed a comprehensive banned construction materials (chemicals) list and each product used at the site must be cleared against this banned chemical list prior to use. The banned construction materials list will be provided to vendors and NOAA can assist with reviewing individual products as needed. Furthermore, it will be required to keep the science at SMO operational as much as possible throughout construction activities. For example, temporary power might be required and/or a phased approach to building modifications that allow for scientific systems to stay online to the greatest extent possible. Instruments may need to be removed from the roof and re-established on platforms elsewhere on the grounds. All onsite work must be coordinated with the station lead. All new construction work shall meet current code requirements. Vendors will be responsible for obtaining any necessary permits.

Location of SMO:

Village of Tula, Cape Matatula, 96799-2521, American Samoa Latitude: -14.2474° N Longitude: -170.5644° W

Contract Line Item No. 01: Base contract: Roof Removal

0.1 Special Roof Information and Specifications

A. The American Samoa roof currently has a metal catwalk that houses various scientific research instrumentation, a flat section where an Ash Instrument Dome houses scientific instrumentation, a carport with a solar panel array mounted to the standing-seam roof, and a lightning protection system mounted on railings located around the Ash Instrument Dome.

1. The catwalk currently has several power feeds connected to the structure inside conduit. Before the removal process begins, disconnect and secure external power feeds connected to the catwalk.

2. If the contractor is unable to remove and replace the roof around/under the catwalk, the catwalk shall be removed and stored to prevent damage and degradation to the integrity of the catwalk components. DO NOT haul the catwalk off with any roofing debris, as the existing catwalk structure shall be remounted once the roof has been replaced.

3. The Ash Dome and wall that it sits on shall be demolished and all relevant debris removed from the roof and disposed of properly before the flat section of the roof can be removed. Note that power to the dome will also need to be disconnected and secured prior to the dome structure’s removal.

4. Remove the lightning protection system from the catwalk, flat roof section railings, and the carport. Remove the railings around the flat roof section. Set the lightning protection system and all railing sections aside as they will be remounted/reinstalled once the roof has been replaced.

0.2 Roof Removal

A. Once the Ash Dome and support wall, the catwalk (if necessary), the lightning protection system, and the railings have been removed, the rest of the roof system can be removed.

1. Remove the standing seam metal roof.

2. Remove the flat rubber roof section.

3. Remove any underlayment roof product, as needed.

4. Remove the gutters, flashing, wall caps, etc.

5. Remove any other necessary items needed to completely remove the roof system.

6. Haul all roofing debris off site for proper disposal.

Contract Line Item No. 01: Base contract: Roof Replacement and Installation

PART 1 - GENERAL

All work should comply with the International Building Code (IBC) 2021 edition.

1.1 PERFORMANCE REQUIREMENTS

A. General: Provide an installed and flashed, corrugated metal panel roofing system, including, but not limited to, custom-fabricated metal roof pans, cleats, clips, anchors and fasteners, sheet metal flashing and drainage components related to corrugated metal roofing, fascia panels, trim, underlayment, and accessories as indicated and as required for a weathertight installation.

Provide an installed and flashed rubber roofing system, including, but not limited to, custom-fabricated anchors and fasteners, sheet metal flashing and drainage components related to flat roof, fascia panels, trim, underlayment, and accessories as indicated and as required for a weathertight installation.

B. Metal used should be a minimum of 24ga (0.7mm) thickness, or thicker.

C. Wind-Uplift Resistance: Provide corrugated panel metal roofing capable of resisting the following design negative uplift pressure. Provide clips, fasteners, and clip spacings of type indicated and with capability to sustain, without failure, a load equal to 3 times the design negative uplift pressure.

1. Design Negative Uplift Pressure: As indicated on drawings from 2006 remodel and to comply with current IBC 2021 code. When the 2006 drawings and current IBC (2021) codes differ, the IBC (2021) requirement will take precedence.

D. Wind-Uplift Resistance: Provide necessary portable equipment required to complete metal roofing assemblies that comply with uplift (UL) for 160 mile per hour wind-uplift resistance.

E. Thermal Movements: Provide corrugated panel metal roofing that allows for thermal movements resulting from the following maximum change (range) in ambient and surface temperatures by preventing buckling, opening of joints, hole elongation, overstressing of components, failure of joint sealants, failure of connections, and other detrimental effects.

Provide clips that resist rotation and avoid shear stress as a result of sheet metal roofing thermal movements. Base engineering calculation on surface temperatures of materials due to both solar heat gain and nighttime-sky heat loss.

1. Temperature Change (Range): 120 deg F (67 deg C), ambient; 180 deg F (100 deg C), material surfaces.

F. Water Infiltration: Provide corrugated panel metal roofing that does not allow water infiltration to building interior, with metal flashing and connections of sheet metal roofing lapped to allow moisture to run over and off the material. Properly flash around all roof penetrations and wall edges, as required, to ensure a water-tight roof system. Properly caulk all areas around flashing and seams as required to provide a water-tight system.

G. Corrosion Resistance: Roof needs to be resistant to all forms of corrosion that exist within the environment of American Samoa. The site’s location in the tropics requires all components to be especially resistant to rust and the salt spray/air coming off of the ocean nearby. It is preferred that 316 Stainless Steel hardware, fasteners, etc. are used whenever possible. When 316 stainless steel is not an option, the products must be galvanized metal at a minimum. Particular attention should be paid to galvanic corrosion (when metals of different types might come into contact with one another) and this should be avoided by use of proper materials and installation techniques.

H. The roof and all related materials and accessories should have an expected life expectancy of 20 years minimum.

1.2 SUBMITTALS

A. Product Data: For each product indicated. Include details of construction relative to materials, dimensions of individual components and profiles, and finishes.

B. Shop Drawings: Show fabrication and installation layouts of corrugated metal roofing, including plans, elevations, and keyed references to termination points. Distinguish between shop- and field-assembled work.

Include the following:

1. Details for joining and securing corrugated metal roofing, including dimensions, layout of fasteners, clips, and other attachments. Include location of seams.

2. Details of termination points and assemblies, including fixed points.

3. Details of expansion joints, including showing direction of expansion and contraction.

4. Details of roof penetrations.

5. Details of edge conditions, including eaves, ridges, valleys, rakes, crickets, and counter flashings.

6. Details of special conditions.

7. Details of connections to adjoining work.

8. Details of the following accessory items, at a scale of not less than 1-1/2 inches per 12 inches (1:10):

a. Flashing and trim.

C. Coordination Drawings: Roof plans drawn to scale and coordinating penetrations and roof-mounted items. Show the following:

1. Metal roofing and attachments.

2. Purlins and rafters.

3. Roof-mounted items including roof hatches, equipment supports, pipe supports and penetrations, lighting fixtures, and items mounted on roof curbs.

D. Samples for Initial Selection:

1. For each type of corrugated metal roofing indicated with factory-applied color finishes.

a. Include similar Samples of trim and accessories involving color selection.

2. For flat rubber roof product.

E. Qualification Data: For each installer, provide written list qualifications for the products included in the work F. Product Test Reports: Based on evaluation of comprehensive tests performed by a qualified testing agency, for corrugated metal roofing. Include reports for structural performance.

G. Warranties: Special warranties specified in this Section.

H. Detailed Maintenance Schedule: Provide a detailed maintenance schedule that details what maintenance needs to be performed to ensure the longevity of the roof, gutters, and all other accessories as well as the frequency in which these tasks must be performed.

1.3 QUALITY ASSURANCE

A. Installer Qualifications: Fabricator and/or installer of corrugated metal roofing systems.

B. Conform to dimensions and profiles shown unless more stringent requirements are indicated.

1.4 DELIVERY, STORAGE, AND HANDLING

A. Deliver sheet metal roofing pans, components, and other corrugated metal roofing materials so as not to be damaged or deformed. Package corrugated metal roofing materials for protection during transportation and handling.

B. Unload, store, and erect corrugated sheet metal roofing materials in a manner to prevent bending, warping, twisting, and surface damage.

C. Stack materials on platforms or pallets, covered with suitable weathertight and ventilated covering. Store metal roofing materials to ensure dryness. Do not store metal roofing materials in contact with other materials that might cause staining, denting, or other surface damage.

1. Store aluminum away from uncured concrete and masonry.

D. Protect strippable protective covering on corrugated metal roofing, when applicable,from exposure to sunlight and high humidity, except to the extent necessary for the period of sheet metal roofing installation.

E. The SMO carport area may be used for temporary storage of materials to help protect them from sun and rain exposure between delivery to the site and installation.

1.5 COORDINATION

A. Coordinate installation of roof curbs, equipment supports, and roof penetrations, which are specified below in Section 2.5 "Roof Accessories."

B. Coordinate metal roofing with rain drainage work, flashing, trim, sheathing, rafters, parapets, walls, and other adjoining work to provide a leakproof, secure, and noncorrosive installation.

C. Coordinate flat roof installation with the dome installation and complete all flashing to provide a leakproof, secure, and noncorrosive installation.

1.6 WARRANTY

A. Special Warranty on Finishes: Manufacturer's standard form in which manufacturer agrees to repair finish or replace metal roofing that shows evidence of deterioration (to include rust) of factory-applied finishes within specified warranty period.

1. Fluoropolymer Finish: Deterioration includes, but is not limited to, the following:

a. Color fading more than 5 Hunter units when tested according to ASTM D 2244.

b. Chalking in excess of a No. 8 rating when tested according to ASTM D 4214.

c. Cracking, checking, peeling, or failure of paint to adhere to bare metal.

2. Finish Warranty Period: 20 years from date of Substantial Completion.

B. Special Installer's Warranty: Roofing Installer's warranty, on warranty form at end of this Section, signed by Roofing Installer, in which Roofing Installer agrees to repair or replace components of custom-fabricated sheet metal roofing that fail in materials or workmanship within the specified warranty period.

1. Failures include, but are not limited to, the following:

a. Structural failures.

b. Loose parts.

c. Wrinkling or buckling.

d. Failure to remain weathertight, including uncontrolled water leakage.

e. Deterioration of metals, metal finishes, and other materials beyond normal weathering, including nonuniformity of color or finish.

f. Galvanic action between sheet metal roofing and dissimilar materials.

2. Installation Warranty Period: Two years from date of Substantial Completion.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. In other Part 2 articles where titles below introduce lists, the following requirements apply for product selection:

1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the manufacturers specified.

2. Manufacturers: Subject to compliance with requirements, provide products by the manufacturers specified.

2.2 ROOFING METALS

A. Galvanized Corrugated Metal Panels or Metallic-Coated Steel Prepainted with Coil Coating:

Steel sheet metallic coated by the hot-dip process and pre painted by the coil-coating process to comply with ASTM A 755/A 755M.

1. Galvanized or Aluminum-Zinc Alloy-Coated Steel Sheet: ASTM A 792/A 792M, Class AZ50 coating designation, Grade 40 (Class AZM150 coating designation, Grade 275); structural quality.

2. Minimum Thickness: 0.0276 inch (0.7 mm), unless otherwise indicated.

3. Exposed Finishes: Apply cold galvanizer product to exposed edges or the following coil coating, as specified or indicated on Drawings:

a. Siliconized-Polyester Coating: Epoxy primer and silicone-modified, polyester-enamel topcoat; with a dry film thickness of not less than 0.2 mil (0.005 mm) for primer and 0.8 mil (0.02 mm) for topcoat.

B. Color: As selected by Owner from the manufacturer's full range.

2.3 UNDERLAYMENT MATERIALS

A. Felts: ASTM D 226, Type I (No. 15), asphalt-saturated organic felts.

B. Slip Sheet: Building paper, minimum 5 lb/100 sq. ft. (0.24 kg/sq. m), rosin sized.

2.4 MISCELLANEOUS MATERIALS

A. General: Provide materials and types of fasteners, solder, welding rods, protective coatings, separators, sealants, and other miscellaneous items as required for a complete roofing system and as recommended by fabricator for corrugated metal roofing.

B. Fasteners: Self-tapping screws, self-locking rivets and bolts, and other suitable fasteners designed to withstand design loads.

1. Exposed Fasteners: Heads matching color of metal roofing by means of plastic caps or factory-applied coating.

2. Fasteners for Flashing and Trim: Blind fasteners or self-drilling screws with hex washer head.

3. Blind Fasteners: High-strength aluminum or stainless-steel rivets.

4. 316 Stainless Steel fasteners whenever possible.

C. Sealing Tape: Pressure-sensitive, 100 percent solids, polyisobutylene compound sealing tape with release-paper backing. Provide permanently elastic, non sag, nontoxic, non staining tape.

D. Elastomeric Joint Sealant: ASTM C 920, of base polymer, type, grade, class, and use classifications required to seal joints in metal roofing that will remain weathertight and as recommended by metal roofing manufacturer for installation.

E. Bituminous Coating: Cold-applied asphalt mastic, SSPC-Paint 12, compounded for 15-mil (0.4-mm) dry film thickness per coat. Provide inert-type non corrosive compound free of asbestos fibers, sulfur components, and other deleterious impurities.

2.5 ACCESSORIES

A. Metal Roofing Accessories: Provide components required for a complete metal roofing assembly including trim, copings, fasciae, corner units, ridge closures, clips, flashings, sealants, gaskets, fillers, closure strips, and similar items. Match material and finish of metal roofing, unless otherwise indicated.

B. Component quality: All roof accessories, including eave, ridge, and soffit vents shall be designed for 160 mph wind load and shall be corrosion resistant.

1. Closures: Provide closures at eaves and ridges, fabricated of same metal as metal roofing.

2. Cleats: Provide cleats fabricated from material recommended by the manufacturer.

3. Backing Plates: Provide metal backing plates at panel end splices, fabricated from material recommended by the manufacturer.

4. Closures: Closed-cell, expanded, cellular, rubber or crosslinked, polyolefin-foam or closed-cell laminated polyethylene; minimum 1-inch- (25-mm-) thick, flexible closure strips; cut or pre molded to matcht metal roofing profile. Provide closure strips where indicated or necessary to ensure weathertight construction.

C. Flashing and Trim: Provide formed from 0.032-inch- (0.813-mm-) thick, zinc-coated (galvanized) steel sheet or aluminum-zinc alloy-coated steel sheet prepainted with coil coating.

Provide flashing and trim as required to seal against weather and to provide finished appearance.

Locations include, but are not limited to, eaves, rakes, corners, bases, framed openings, ridges, fasciae,and fillers. Finish flashing and trim with the same finish system as adjacent metal roofing.

D. Gutters: Provide formed from 0.032-inch (0.813-mm-) thick, or aluminum-zinc alloy-coated steel sheet prepainted with coil coating. Match profile of gable trim, complete with end pieces, outlet tubes, and other special pieces as required to connect to the existing on site water cistern.

Fabricate in minimum 96-inch- (2400-mm-) long sections, sized according to SMACNA's "Architectural Sheet Metal Manual." Furnish gutter supports spaced 36 inches (900 mm) o.c., fabricated from 316 Stainless Steel (preferred) or galvanized. Provide aluminum wire ball strainers at outlets. Finish gutters to match roof fascia and rake trim. Current gutter system has rusted faster than all other components of the 2005 roof system; a robust and long-lasting product for the gutter system is highly desirable.

E. Pipe Flashing: Premolded, EPDM pipe collar with flexible aluminum ring bonded to base.

F. Ridge vent and cap: Formed from 0.032-inch (0.813-mm-) thick, or aluminum-zinc alloy-coated steel sheet prepainted with coil coating to match roof. Vent shall be designed to resist 160 mph rain infiltration.

2.6 FLAT ROOFING MATERIALS

A. Provide replacement flat, heavy duty, rubber roofing materials and all flashing.

1. Durable, non-black, non-slip surface is preferred.

2. Prefer Siplast SBS modified bitumen, or equivalent product.

3. Proper insulation and sloped decking to drain water toward the scuppers is required.

2.7 EQUIPMENT

A. Provide all speciality roofing equipment necessary for the complete installation of the corrugated metal and flat roofing system.

2.8 FABRICATION

A. General: Fabricate sheet metal roofing and accessories at the shop to greatest extent possible.

B. Lay out metal roofing so cross seams, when required, are made in direction of flow with higher pans overlapping lower pans. Stagger cross seams.

1. Form and fabricate metal, seams, strips, cleats, valleys, ridges, edge treatments, integral flashings, and other components of metal roofing to profiles, patterns, and drainage arrangements shown and as required for leak proof construction.

D. Sealant Joints: Where movable, non expansion-type joints are indicated or required to produce weathertight seams, form metal to provide for proper installation of elastomeric sealant, in compliance with manufacturer/industry standards.

E. Metal Protection: Where dissimilar metals will contact each other, protect against galvanic action by painting contact surfaces with bituminous coating, by applying rubberized-asphalt underlayment to each contact surface, or by other permanent separation as recommended by manufacturers of dissimilar metals or by fabricator.

F. Metal Roof Accessories: Custom fabricate flashings and trim to comply with design, dimensions, metal, and other characteristics of the item indicated. Obtain field measurements for accurate fit before shop fabrication.

2.9 FINISHES, GENERAL

A. Comply with NAAMM's "Metal Finishes Manual for Architectural and Metal Products" for recommendations for applying and designating finishes.

B. Protect mechanical and painted finishes on exposed surfaces from damage by applying a strippable, temporary protective covering before shipping, if applicable.

C. Appearance of Finished Work: Variations in appearance of abutting or adjacent pieces are acceptable if they are within one-half of the range of approved Samples. Noticeable variations in the same piece are not acceptable. Variations in appearance of other components are acceptable if they are within the range of approved Samples and are assembled or installed to minimize contrast.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements for installation tolerances, metal roofing supports, and other conditions affecting performance of work.

1. Examine primary and secondary roof framing to verify that rafters, purlins, angles, channels, and other structural panel support members and anchorages are undamaged (water/mold exposure) and are correctly installed.

2. Examine solid roof sheathing to verify that sheathing joints are supported by framing or blocking and that installation is within flatness tolerances.

3. Verify that substrate is sound, dry, smooth, clean, sloped for drainage, and completely anchored, and that provision has been made for flashings, and penetrations through metal roofing.

4. For the record, prepare a written report, endorsed by Installer, listing conditions detrimental to performance of work.

B. Examine roughing-in for components and systems penetrating metal roofing to verify actual locations of penetrations relative to seam locations of metal roofing before roofing installation.

C. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 PREPARATION

A. Install flashings and other metal to comply with code requirements (wind specifications) and to ensure a water-tight finished roof product.

3.3 UNDERLAYMENT INSTALLATION

A. Felt Underlayment: Install felt underlayment and building-paper slip sheet on roof sheathing under metal roofing. Use adhesive for temporary anchorage, where possible, to minimize use of mechanical fasteners under metal roofing. Ensure adhesive complies with banned construction materials list prior to purchase and use. Apply at locations indicated below, in shingle fashion to shed water, with lapped joints of not less than 2 inches (50 mm).

1. Apply from eave to ridge.

2. Apply on roof not covered by self-adhering sheet underlayment. Lap edges of self-adhering sheet underlayment not less than 3 inches (75 mm), in shingle fashion to shed Water.

B. Install flashings to cover underlayment to comply with code requirements and manufacturer’s specifications.

C. Apply slip sheet over underlayment before installing metal roofing.

3.4 INSTALLATION, GENERAL

A. General: Install metal roofing perpendicular to purlins or supports. Anchor metal roofing and other components of the Work securely in place, with provisions for thermal and structural movement. Install fasteners, solder, welding rods, protective coatings, separators, sealants, and other miscellaneous items as required for a complete roofing system and as recommended by fabricator for metal roofing.

1. Field cutting of metal roofing by torch is not permitted.

2. Rigidly fasten eave end of metal roofing and allow ridge end free movement due to thermal expansion and contraction. Predrill roofing.

3. Provide metal closures at peaks rake, edges rake, walls and each side of ridge and hip caps.

4. Flash and seal sheet metal roofing with weather closures at eaves, rakes, and at perimeter of all openings. Fasten with self-tapping screws.

5. Locate and space fastenings in uniform vertical and horizontal alignment.

6. Install ridge and hip caps as metal roofing work proceeds.

7. Locate roofing splices over, but not attached to, structural supports. Stagger roofing splices and end laps to avoid a four-panel lap splice condition.

8. Lap metal flashing over metal roofing to allow moisture to run over and off the Material.

9. Field treat all bare metal surfaces from cut sheet materials, flashing, fascia, drill holes, etc. with appropriate anti-rust product for each material (i.e. galvanizing paint, etc.).

B. Fasteners: Use fasteners of sizes that will not penetrate completely through substrate.

1. Steel Roofing: Use stainless-steel fasteners.

C. Metal Protection: Where dissimilar metals will contact each other or corrosive substrates, protect against galvanic action by painting contact surfaces with bituminous coating, by applying rubberized-asphalt underlayment to each contact surface, or by other permanent separation as recommended by fabricator of metal roofing or manufacturers of dissimilar metals.

D. Conceal fasteners and expansion provisions where possible in exposed work and locate to minimize possibility of leakage. Cover and seal fasteners and anchors as required for a tight installation.

E. Fascia: Align bottom of sheet metal roofing and fasten with blind rivets, bolts, or self-tapping screws. Flash and seal metal roofing with weather closures where fasciae meet soffits, along lower panel edges, and at the perimeter of all openings.

3.5 CUSTOM-FABRICATED CORRUGATED METAL ROOFING INSTALLATION

A. Fabricate and install work with lines and corners of exposed units true and accurate. Form exposed faces flat and free of buckles, excessive waves, and avoidable tool marks, considering temper and reflectivity of metal. Provide uniform, neat seams with minimum exposure of solder, welds, and sealant.

1. Install cleats to hold metal panels in position, as required. Attach each cleat with two fasteners to prevent rotation.

2. Nail cleats not more than 12 inches (300 mm) o.c. Bend tabs over nails.

B. Seal joints as shown and as required for leak proof construction. Provide low-slope transverse seams using cleats where backup of moisture may occur.

1. Where sealant-filled joints are used, embed hooked flanges of joint members not less than 1 inch (25 mm) into sealant. Form joints to completely conceal sealant. When ambient temperature at time of installation is moderate, between 40 and 70 deg F (4 and

21 deg C), set joint members for 50 percent movement either way. Adjust setting proportionately for installation at higher ambient temperatures. Do not install sealant-type joints at temperatures below 40 deg F (4 deg C).

2. Prepare joints and apply sealants to comply with manufacturer recommendations.

C. Soldered Joints: Clean surfaces to be soldered, removing oils and foreign matter. Pretin edges of sheets to be soldered to a width of 1-1/2 inches (38 mm), except where pre tinned surface would show in finished Work.

1. Do not solder metallic-coated steel sheets.

2. Do not use torches for soldering. Heat surfaces to receive solder and flow solder into joint. Fill the joint completely. Completely remove flux and spatter from exposed surfaces.

D. Provide expansion cleats in roof panels that exceed 30 feet (9.1 m) in length.

E. Corrugated Roofing: Attach corrugated metal pans to substrate with cleats, double-nailed at 12 inches (305 mm) o.c. Install pans reaching from eave to ridge before moving to adjacent pans. Lock each pan to pan below with transverse seam. Before pans are locked, apply a continuous bead of sealant to the top flange of the lower pan. 1. Loose-lock pans at eave edges to continuous cleats and flanges on back edges of gutters.

3.6 ACCESSORY INSTALLATION

A. General: Install accessories with positive anchorage to building and weathertight mounting and provide for thermal expansion. Coordinate installation with flashings and other components.

1. Install components required for a complete metal roofing assembly including trim, copings, ridge closures, seam covers, flashings, sealants, gaskets, fillers, closure strips, and similar items.

2. Install components required for a complete flat roof assembly (EPDM or rubber) including trim, copings, seam covers, flashings, sealants, gaskets, fillers, closure strips, and similar items, including appropriately flashing around the round dome installation.

3. Install gutters and connect them to existing gray water cistern.

4. Reinstall railings

5. Reinstall lightning protection system.

6. Reinstall catwalk.

B. Flashing and Trim: Comply with performance requirements, manufacturer's written installation instructions, and SMACNA's "Architectural Sheet Metal Manual." Provide concealed fasteners where possible, and set units true to line and level as indicated. Install work with laps, joints, and seams that will be permanently watertight and weather resistant.

1. Install exposed flashing and trim that is without excessive oil canning, buckling, and tool marks and that is true to line and levels indicated, with exposed edges folded back to form hems. Install metal flashing and trim to fit substrates and to result in waterproof and weather-resistant performance.

2. Expansion Provisions: Provide for thermal expansion of exposed flashing and trim.

Space movement joints at a maximum of 10 feet (3 m) with no joints allowed within 24 inches (600 mm) of corner or intersection. Where lapped or bayonet-type expansion provisions cannot be used or would not be sufficiently weather resistant and waterproof, form expansion joints of intermeshing hooked flanges, not less than 1 inch (25 mm) deep, filled with mastic sealant (concealed within joints).

C. Gutters: Join sections with riveted and soldered or lapped and sealed joints. Attach gutters to eave with gutter hangers spaced not more than 4 feet (1.2 m) o.c. using manufacturer's standard fasteners. Provide end closures and seal watertight with sealant. Provide for thermal Expansion. Connect the gutter system to the existing gray water cistern.

D. Pipe Flashing: Form flashing around pipe penetration and sheet metal roofing. Fasten and seal to sheet metal roofing as recommended by the manufacturer.

3.7 INSTALLATION TOLERANCES

A. Installation Tolerances: Shim and align metal roofing within installed tolerance of 1/4 inch in 20 feet (6 mm in 6 m) on slope and location lines as indicated and within 1/8-inch (3-

mm) offset of adjoining faces and of alignment of matching profiles.

3.8 CLEANING AND PROTECTION

A. Clean exposed metal surfaces of substances that interfere with uniform oxidation and weathering.

B. Clean and neutralize flux materials. Clean off excess solder and sealants.

C. Remove temporary protective coverings and strippable films, if any, as metal roofing is installed. On completion of metal roofing installation, clean finished surfaces, including removing unused fasteners, metal filings, pop rivet stems, and pieces of flashing. Maintain in a clean condition during construction.

D. Replace panels that have been damaged or have deteriorated beyond successful repair by finish touch up or similar minor repair procedures.

3.9 ROOFING INSTALLER'S WARRANTY

A. WHEREAS <Insert name> of <Insert address>, herein called the "Roofing Installer," has performed roofing and associated work ("work") on the following project:

1. Owner: <Insert name of Owner.>

2. Address: <Insert address.>

3. Building Name/Type: <Insert information.>

4. Address: <Insert address.>

5. Area of Work: <Insert information.>

6. Acceptance Date: <Insert date.>

7. Warranty Period: 20 years.

8. Expiration Date: <Insert date.>

B. AND WHEREAS Roofing Installer has contracted (either directly with Owner or indirectly as a subcontractor) to warrant said work against leaks and faulty or defective materials and workmanship for designated Warranty Period, C. NOW THEREFORE Roofing Installer hereby warrants, subject to terms and conditions herein set forth, that during Warranty Period he will, at his own cost and expense, make or cause to be made such repairs to or replacements of said work as are necessary to correct faulty and defective work and as are necessary to maintain said work in a watertight condition.

D. This Warranty is made subject to the following terms and conditions:

1. Specifically excluded from this Warranty are damages to work and other parts of the building, and to building contents, caused by:

a. lightning;

b. peak gust wind speed exceeding 160 mph;

c. fire;

d. failure of roofing system substrate, including cracking, settlement, excessive deflection, deterioration, and decomposition;

e. faulty construction of parapet walls, copings, chimneys, skylights, vents, equipment supports, and other edge conditions and penetrations of the work;

f. vapor condensation on bottom of roofing; and

g. activity on roofing by others, including construction contractors, maintenance personnel, other persons, and animals, whether authorized or unauthorized by Owner.

2. When work has been damaged by any of foregoing causes, Warranty shall be null and void until such damage has been repaired by Roofing Installer and until cost and expense thereof have been paid by Owner or by another responsible party so designated.

3. Roofing Installer is responsible for damage to work covered by this Warranty but is not liable for consequential damages to building or building contents resulting from leaks or faults or defects of work.

4. During Warranty Period, if Owner allows alteration of work by anyone other than Roofing Installer, including cutting, patching, and maintenance in connection with penetrations, attachment of other work, and positioning of anything on roof, this Warranty shall become null and void on date of said alterations, but only to the extent said alterations affect work covered by this Warranty. If Owner engages Roofing Installer to perform said alterations, Warranty shall not become null and void unless Roofing Installer, before starting said work, shall have notified Owner in writing, showing reasonable cause for claim, that said alterations would likely damage or deteriorate work, thereby reasonably justifying a limitation or termination of this Warranty.

5. During Warranty Period, if original use of roof is changed and it becomes used for, but was not originally specified for, a promenade, work deck, spray-cooled surface, flooded basin, or other use or service more severe than originally specified, this Warranty shall become null and void on date of said change, but only to the extent said change affects work covered by this Warranty.

6. Owner shall promptly notify Roofing Installer of observed, known, or suspected leaks, defects, or deterioration and shall afford reasonable opportunity for Roofing Installer to inspect work and to examine evidence of such leaks, defects, or deterioration.

7. This Warranty is recognized to be the only warranty of Roofing Installer on said work and shall not operate to restrict or cut off Owner from other remedies and resources lawfully available to Owner in cases of roofing failure. Specifically, this Warranty shall not operate to relieve Roofing Installer of responsibility for performance of original work according to requirements of the Contract Documents, regardless of whether Contract was a contract directly with Owner or a subcontract with Owner's General Contractor.

E. IN WITNESS THEREOF, this instrument has been duly executed this <Insert day> day of <Insert month>, <Insert year>.

1. Authorized Signature: <Insert signature.>

2. Name: <Insert name.>

3. Title: <Insert title.>

Contract Line Item No. 02: Optional contract: Installation of Ash Instrument Dome and Wall

Part 4 General The Ash instrument dome (https://ashdome.com/) currently located on the flat rubber roof shall be replaced concurrently with the roof. Specifications for the dome, purchased and transported to the site by NOAA/GML in a separate contract, are found in Appendix A. Additional photos of the current dome are found in Appendix A. The dome will not come with anchoring bolts so the contractor will have to procure the anchoring bolts necessary to secure the dome in place. Additionally, the anchoring bolts should be made of 316 stainless steel when possible.

4.1 Installation of Ash Instrument Dome Wall

A. The Ash Instrument Dome Wall will be furnished by NOAA/GML and will be on site before or shortly after construction begins.

1. Install new 5’ tall dome wall in the same location and with door orientated in the same direction as the previous wall.

2. Secure the dome wall to the roof of the main observatory. Anchoring bolt specifications can be provided from Ash Dome.

3. Ensure that the dome wall is properly flashed where it meets the flat roof surface.

4.2 Installation of the Ash Instrument Dome

A. The Ash Instrument Dome will be furnished by NOAA/GML and will be on site before or shortly after construction begins.

1. Install new dome on top of the new dome wall. Ensure that the dome faces the same direction as the previous dome.

2. Secure the dome to the dome walls with hardware provided by Ash Domes.

2. Haul all extra packing materials and other dome project debris off site for proper disposal.

Contract Line Item No. 03: Optional contract: Carport Metal Roof Removal and Replacement

4.1 Removal of Carport Roof

A. Attached to the carport roof are the solar panel system (panels, mounting brackets, and conduit) and the lightning protection system. DO NOT dispose of the lightning protection system or solar hardware as it will need to be stored and re-installed onto the new roof. A portion of the lightning protection system extends from the main observatory to the carport.

1. Electrically disconnect the solar panel array from the main building.

2. Remove the solar panels and all mounting brackets, hardware, conduits, etc..

3. Uninstall the lightning protection system mounted to the carport roof.

4. Remove flashing around two sides (east and west) of carport roof wood framing.

5. Remove the carport metal roof.

4.2 Installation of Carport Roof.

A. New carport roofing material should either match the new material used for the main observatory roof or be a similar product to the material used on the existing carport roof. This is left to vendor’s discretion. Additionally, the new carport roof should match the color of the Observatory’s new roof. If the roof product selected is different from the existing roof, new mounting brackets for the solar panels may be required. The vendor will need to verify if new hardware is required to reinstall the solar system and procure and install any new hardware needed for the solar array to be remounted to the car port roof. All installation accessories should be made of 316 stainless steel when possible.

1. Install the new carport roof.

2. Flash all three edges of the new carport roof.

3. Remount lightning protection system to carport roof (replace components, as needed).

4. Remount solar panel array and reconnect it to the main observatory building.

5. Haul all roofing debris off site for proper disposal.