714AP_2_Work_Plan_Pelican_Island_NWR_Replace_Bunkhouse_Roof.pdf

WORK PLAN

-for-

CONSTRUCTION SERVICES

-of-

Roof Replacement

-on the-

Bunkhouse

[Asset No. 10067145]

-at the-

Pelican Island National Wildlife Refuge

4015 Wildlife Way, Vero Beach, FL 32963

IMD Project No: 714AP

U.S. Fish and Wildlife Service

Department of the Interior

Contents

1. Uninstall and Salvage Rooftop PV System

2. Roof Tear-Off and Damage Inspection

3. Remove and Patch Skylights

4. Provide New Roofing System

5. Provide New Drainage System

6. Provide New Lightning Protection System

1. Uninstall and Salvage Rooftop PV System

A. Safely disconnect and uninstall rooftop photovoltaic assembly, including panels, roof mounts, and other primary outdoor components, as well as indoor electrical PV components.

B. Salvage PV components at cost savings to contract.

2. Roof Tear-Off and Damage Inspection

A. Full tear-off of existing architectural asphalt shingle roof assembly to expose upper OSB layer of roof Structural Insulation Panels (SIPs), including:

a. Ice and water shield dam membranes [Plan Set / A302, A303],

b. Prefinished metal drip edges [Plan Set / A302, A303],

c. Rooftop rain diverters [Plan Set / A105]

d. Underlayment

e. Fasteners

f. Sealants

g. Flashing

B. Inspect existing roof assembly components, existing penetrations, and roof structure assembly for leaks, water damage, or other damage and immediately inform CO and COR of identified conditions. Additionally, ensure that roof structure meets current code and confirm that no hurricane retrofitting is required. No such damage or retrofitting is expected, and any repairs to such items shall be considered unknown conditions.

C. Document condition of OSB on SIP panels after roof tear-off.

D. Ensure structural stability to meet conditions and specifications required of roofing assembly.

NOTE 1:

Phased roof deconstruction and replacement may be allowed to shorten the duration of the construction activity and to prevent water intrusion during construction if appropriately planned, but not to the detriment of overall quality.

SUBMITTAL LIST:

1. Roof inspection and condition assessment report

2. Roof structural stability statement

3. Remove and Patch Skylights

A. Remove all existing skylight assemblies, including domes, flashing, tubes, rings, seals, diffusers, and associated fasteners and hardware.

B. Inspect surrounding SIPs panels for moisture, water damage, or other damage and document conditions.

C. Provide dimensional lumber framing, rigid foam insulation to meet or exceed insulation values (R-value � 42), OSB, flashing, and any other materials required to provide rigid, watertight, and structurally sound patch comparable to original condition according to industry best practices.

Proper detailing is critical and must be scrutinized closely to minimize the likelihood of future leaks at these locations.

D. Provide dimensional lumber, drywall, prime, paint, and any other materials required to structurally and visually patch openings without apparent change in surface color, texture, or seams, comparable to original condition. Ensure to prevent overspray or drips of paint onto other surfaces, furniture, or personal belongings.

E. Provide work plan to repair holes in SIPs as a submittal.

SUBMITTAL LIST:

1. SIP patching and repair plan

4. Provide New Roofing System

A. Provide a watertight standing seam metal roof (SSMR) assembly compatible with the facility function, construction, and service conditions. Provide complete roof system design and construction services for the entire facility roof system, including all ancillary and incidental work necessary for a complete, new, watertight roof system installation. The SSMR system covered under this specification must include the entire roofing system; the standing seam metal roof panels, fasteners, connectors, roof securement components, and assemblies, tested and approved in accordance with ASTM E 1592. In addition, the system must consist of panel finishes, slip sheet, all accessories, components, and trim, and all connections with roof panels.

This includes roof penetration items such as vents, curbs, skylights; interior or exterior gutters and downspouts; eaves, ridge, hip, valley, rake, gable, wall, or other roof system flashings installed, and any other components specified within this contract to provide a weathertight roof system.

a. Structure: Provide and install new roofing system onto existing SIP roof structure.

b. Wind Uplift Resistance: Provide a roofing system that resists wind uplift pressures calculated in accordance with American Society of Civil Engineers (ASCE) 7 or applicable building code requirements. Uplift resistance must be validated by applicable Factory Mutual (FM), Underwriters Laboratories (UL) or American Society for Testing and Materials (ASTM) uplift resistance test procedures.

i. Do not provide roof airspace ventilation gaps via purlins or other methods.

c. Panels: Provide SSMR panels formed at the manufacturing plant and conditioned for flatness with the following specifications:

i. Material: Copper with tin–zinc coating, such as “Freedom Gray”; Determine panel thickness by the requirements of NRCA, Roofing and Waterproofing Manual, but no thinner than 20 oz (22-gauge, 0.0313-IN)

ii. Profile: Mechanically-seamed, inverted-L, double-lock standing seam with 1.5- IN seams with a maximum width of 12-IN

iii. Color: Matte gray after weathering and patina

iv. Panel Protection: Treat exposed cut edges with compatible coating comparable to the factory applied coating system for corrosion protection.

d. Fasteners: All fasteners must be approved by manufacturers of SIPs and metal roofing panels; material shall be stainless steel or copper alloy to prevent galvanic corrosion.

e. Sealants: Provide compatible, non-curing, non-skinning butyl based sealants and tapes for concealed locations such as within laps and under eaves and around roof penetrations. Provide polyurethane and curing butyl elastomeric sealants for exposed locations such as along top edge of surface mounted counter flashings. Proper detailing is critical and must be scrutinized closely to minimize the likelihood of future leaks around standard roof penetrations.

f. Flashing: Provide flashing and sheet metal in accordance with roof manufacturer’s printed installation instructions and in compliance with NRCA and SMACNA recommendations to include all rakes, eaves, valleys, sidewalls, and penetrations.

Flashing shall be copper with tin–zinc coating, such as “Freedom Gray” no thinner than 20 oz (22-gauge, 0.0313-IN).

g. Underlayment: Provide fully-adhered, high-temperature (minimum service rating of 250°F), waterproof synthetic underlayment compliant with ASTM D970 on the entire roof surface.

h. Drip Edges: Provide at all eaves and all rakes a continuous coverage of well-sealed, prefinished drip edges integrated with underlayment for waterproof connection. Drip edges shall be copper with tin–zinc coating, such as “Freedom Gray” no thinner than 20 oz (22-gauge, 0.0313-IN). Drip edges on extended rakes shall be cut, hemmed, and hooked 1-IN over the outer edge of the drip edge, as shown below:

i. Ice and water shield dam membranes [Plan Set / A302, A303]: installed under the underlayment according to industry best practices on all rakes, eaves, valleys, and penetrations; material shall be self-adhering with high temperature resistance (260°F), and a minimum thickness of 1-mm

1. Wind uplift resistance calculations, or approved equal

2. SSMR panel layout

3. SSMR materials

4. Underlayment

5. Provide New Drainage System

A. Replace existing gutters and downspouts at existing locations with materials compatible with roofing material and finish. Concealed (interior) gutters and downspouts are prohibited. The primary and secondary drainage systems must be sized in accordance with applicable Plumbing and Building Codes.

a. Built-in gutter systems where drainage passes through an interior space or is concealed in the exterior cavity wall are prohibited.

b. Provide high-flow gutter guards designed for leaf litter and debris consistent with site conditions.

c. Gutter finish must be baked-on factory applied color coating of polyvinylidene fluoride (PVF2) or other equivalent fluorocarbon coating with a minimum thickness of 0.8 to

1.3 mils. Match existing color (SW 7044 “Amazing Gray”), surface finish, and location.

Profile to be selected by U.S. Fish and Wildlife Service COR.

d. Gutters shall be seamless aluminum of 0.032-IN or greater thickness and 6-IN top width.

e. Gutters shall be installed with appropriate pitch toward downspouts to ensure adequate drainage and sufficient hangers to accommodate heavy rain collection.

f. Provide downspouts compatible with and sufficiently sized for specified gutter systems, with a minimum size of 4-IN × 4-IN. Location and color (SW 7046 “Anonymous”) shall match existing.

g. Provide flexible gutter downspout extensions with leaf and debris filters to release water a minimum 6-FT distance from foundation. Match color to downspout.

B. Provide straight and corner gutter-mounted splash guards over all entranceways to minimize or eliminate overspray during heavy rainfall events.

1. Drainage system layout

2. Drainage system materials

3. Gutter profile options

6. Provide New Lightning Protection System

A. Provide lightning and surge protection in accordance with Florida Building Code, NFPA 780, UL 96A, NEC, and all other applicable regulations.

a. The use of penetrating hardware or components will not be acceptable.

b. Utilize components and installation techniques to ensure longevity of all roofing assembly components and warranties.

c. Lightning protection component attachments must be sealed and flashed and anchored in a permanent manner and in a manner to avoid the degradation of the watertight integrity of the roof system.

d. Do not cut or otherwise disturb the roof membrane.

e. Mastic seals in the plane of the roof are unacceptable.

1. Lightning protection system electrical calculations, or approved equal

2. Lightning protection system layout

3. Lightning protection system materials

— END OF WORK PLAN FOR CONSTRUCTION SERVICES —