Scope_of_Work.pdf

NATIONAL PARK SERVICE

Region IR2

Natchez National Historical Park

Project Name:

Replace O’Ferrall House Asphalt Roof

Natchez National Historical Park Natchez, MS 39120

Statement of Work I. SCOPE: The contractor shall furnish all labor, materials, tools, equipment, and supervision necessary for the replacement of the asphalt shingle roof of the Natchez National Historical Park’s O’Ferrall House located at 217 O’Ferrall Street, Natchez, MS 39120. Roofing will be repaired and placed per specifications listed below.

II. BACKGROUND: The Natchez National Historical Park (NATC) recently acquired the O’Ferrall House through purchase from Southwest Mississippi Mental Health. Constructed in the mid-19th century, the house has been deemed eligible for listing in the National Register of Historic Places by the staff of Mississippi Department of Archives and History (MDAH).

Architecturally, the house is a good representation of a mid-19th century frame, Greek Revival-style cottage with later Victorian era additions. The interior retains a high degree of integrity retaining its original floorplan, several faux-grained doors, and several period mantles.

The house is particularly important due to its association with the Forks of the Road (FOTR), the second largest slave market in the Deep South which was located just across St. Catherine’s Street to the south. Indeed, John O’Ferrall, the man for whom the house is named, was the owner of the slaves pens at the FOTR. O’Ferrall was not a slave trader himself, but simply leased the pens to various individuals and firms to hold sales of the enslaved. O’Ferrall owned the house and surrounding property, and his family would retain title until the 1980s. It is unclear if O’Ferrall built the house or simply purchased the property in the 1860s. If it is determined that the house was built prior to 1863 (the year the slave pens were destroyed by Federal troops), it will be determined to have national significance as the last remaining extant resource associated with the FOTR.

III. PROJECT REQUIREMENTS:

Complete removal of existing roofing Removal of all demolition debris from site.

Repair/replacement of approximately 20 linear feet of rotted and/or missing 6-inch fascia board; paint to match existing Replace approximately 500 sq. ft. of rotted decking Install ice & water shield in valleys, around chimney(s), and where roof terminates at walls Installation of new felt underlayment Installation of new headwall / chimney metal flashings and drip edge Flash all penetrations Installation of approximately 62 squares of new 3-tab asphalt shingle roof, color to match existing Installation of approximately 75 linear feet of new 5-inch aluminum gutters and downspouts along back entrance of house Site cleanup.

IV. PROJECT SPECIFICATIONS:

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes: Fiberglass asphalt shingles over underlayment nailed to roof sheathing.

(1/2 inch structural plywood Grade C or CDX)

1.2 APPLICABLE PUBLICATIONS

A. Comply with references to extent specified in this section.

B. ASTM International (ASTM):

D226/D226M-17 ........................ Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing.

D1970/D1970M-19 .................... Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection.

D3018/D3018M-11(2017) ......... Class A Asphalt Shingles Surfaced with Mineral Granules.

D3161/D3161M-20 .................... Wind Resistance of Steep Slope Roofing Products (Fan-Induced

Method).

D3462/D3462M-19 .................... Asphalt Shingles Made from Glass Felt and Surfaced with

Mineral Granules.

F1667-18a .................................. Driven Fasteners: Nails, Spikes, and Staples.

C. UL LLC (UL):

790(Edition 8) ............................ Fire Tests of Roof Coverings.

1.3 SUBMITTALS

A. Manufacturer's Literature and Data:

1. Description of each product.

2. Installation instructions.

3. Warranty.

B. Samples: Shingles: Full size each type, color and texture.

1.4 DELIVERY

A. Deliver products in manufacturer's original sealed packaging.

B. Mark packaging, legibly. Indicate manufacturer's name or brand, type, color, production run number, manufacture date, and the label of Underwriters Laboratories.

C. Before installation, return or dispose of products within distorted, damaged, or opened packaging.

1.5 STORAGE AND HANDLING

A. Store shingles according to manufacturer's instructions. Store roll goods on end in upright position.

B. Protect products from damage during handling and construction operations.

C. Keep materials dry, covered completely and protected from weather.

1.6 WARRANTY

A. Construction Warranty: FAR clause 52.246-21, "Warranty of Construction."

B. Manufacturer's Warranty: Warrant asphalt shingles against material and manufacturing defects.

1. Material Warranty Period: 25 to 30 years.

2. Wind-Speed Warranty Period: Resist wind speeds up to 160 km/h (100 mph) for 15 years.

3. Algae-Resistance Warranty Period: No discoloration for 15 years.

PART 2 - PRODUCTS

2.1 PRODUCTS - GENERAL

A. Provide each product from one manufacturer.

1. Provide each product exposed to view from one production run.

2. Solar Reflectance Index: 29, minimum.

2.2 ASPHALT SHINGLES

A. Asphalt Shingles: Fiberglass reinforced, laminated type, square butt.

1. ASTM D3462/D3462M and ASTM D3018/D3018M, Type I, self-sealing.

2. ASTM D3161/D3161M, Class D or F wind-resistant.

3. UL 790 Class A fire resistance.

4. Minimum Weight: 10.3 kg/square meter (210 lbs./100 square feet).

2.3 ROOFING NAILS

A. ASTM F1667, Type I, Style 20, galvanized steel, deformed shanks, heads 10 mm to 11 mm (3/8 inch to 7/16 inch) diameter.

1. Nails for Shingles: 32 mm (1-1/4 inches) long.

2. Nails for Felt: 19 mm (3/4 inch) long.

2.4 ROOFING UNDERLAYMENT

A. Organic Felt: ASTM D226/D226M, Type l.

B. Self-Adhering Modified Bituminous Underlayment: ASTMD1970/D1970M.

2.5 METAL FLASHING

A. Provide metal roof flashings, including apron flashings, step flashings, valley flashings, drip edges, and vent pipe flashings.

PART 3 - EXECUTION

3.1 PREPARATION

A. Examine and verify substrate suitability for roofing installation.

1. Verify roof substrates are sound, within manufacturer's tolerances, and free from defects which would interfere with roofing installation.

2. Verify roof accessories, vent pipes and other projections through roof are in place and roof flashing is installed, or ready for installation, before installing shingles.

B. Protect existing construction and completed work from damage.

3.2 INSTALLATION - GENERAL

A. Install products according to manufacturer's instructions and approved submittal drawings.

1. When manufacturer's instructions deviate from specifications, submit proposed resolution for Contracting Officer's Representative consideration.

3.3 METAL DRIP EDGE INSTALLATION

A. At eaves and rakes, install stainless steel drip edges.

1. Eaves: Install metal drip edge before underlayment.

2. Rakes: Install metal drip edge after underlayment.

B. Secure metal drip edges with compatible nails spaced maximum 250 mm (10 inches) on center along inner edges.

3.4 FLASHING INSTALLATION

A. Install metal flashings at intersections of roofs, adjoining walls, or projections through deck such as chimneys and vent stacks.

1. Secure valley flashing according to shingle manufacturer's instructions.

2. Secure valley flashing according to shingle manufacturer's instructions.

3. Expose flashing in open portion of valley 125 mm (5 inches) minimum, and lap shingles over flashing 125 mm (5 inches) minimum.

3.5 UNDERLAYMENT INSTALLATION

A. Install organic felt underlayment on roof deck, with 100 mm (4 inches) minimum end laps, 50 mm (2 inches) minimum head laps, and 300 mm (12 inches) minimum ridge laps. Nail felt 125 mm (5 inches) on centers along laps.

3.6 ASPHALT SHINGLE INSTALLATION

A. Install shingles aligned parallel to roof eave, nailed to roof sheathing.

1. Exposure: 125 mm (5 inches) maximum.

2. Head lap: 50 mm (2 inches) minimum.

B. Install asphalt-shingle starter strip with tabs removed and overhanging lower edge of roof 13 mm (1/2 inch).

3.7 // HIP // AND // RIDGE // SHINGLE INSTALLATION

A. Bend each shingle lengthwise down center to provide equal exposure on both sides of hip and ridge.

1. Begin ridge installation at leeward end of ridge. Cover ridge vents with shingles.

2. Begin hip installation at eave.

B. Install shingles with maximum 125 mm (5 inches) exposure.

C. Secure each shingle with one nail on both sides of hip and ridge, 215 mm (8-1/2 inches) back from exposed end and one inch up from edge.

V. PHOTOGRAPHS:

Southwest Elevation West Elevation (Front Entrance)

North Elevation Northeast Elevation (Back Entrance / Location for gutters)

Fascia damage Fascia damage

VI. BIDDERS TO VISIT SITE: All bidders are expected to visit the site of the work and to inform themselves as to all existing conditions. Failure to do so in no way relieves the successful bidder from the necessity of furnishing all equipment and materials and performing all work required for the completion of the contract in conformity with all specifications.

No allowance will be made for the failure of the bidder correctly to estimate the difficulties attending the execution of the work.

VII. RESPONSIBILITY FOR EMPLOYEES: The contractor shall be responsible for the safety of his employees and for any injury or damage done to or by them from any source or cause. He shall save and hold the United States free from all claims for damages to all persons and (or) property arising from the execution of the work covered by these specifications.

The contractor shall make good at his own expense all damage to any property of the United States, arising from his operations under these specifications, or from the fault or neglect of any of his employees.

VIII. DELIVERABLE: The deliverable for this project is the satisfactorily completion for all required work under this contract. All equipment, tools, surplus materials, and rubbish shall be removed upon completion of work.

IX. CONTRACT PERFORMANCE PERIOD: 90 days from Notice to Proceed.

X. WORKING HOUR RESTRICTIONS: All work and deliveries shall be limited to the weekday hours of 7:00 am to 4:00 pm Monday through Friday, unless otherwise approved by the Contracting Officer or COR. No work shall occur on National Park Service holidays or weekends without prior approval.

XI. PAYMENT: Payments will be processed upon completion of project and need to be submitted to and processed via the electronic invoicing system. Information can be found at www.ipp.gov.