Cedar_Roof_Shakes_SoW.docx

STATEMENT OF WORK - Repair Wood Shingle Roofs of 5 Historic Buildings

BACKGROUND:PROJECT DESCRIPTION

A. GENERAL DESCRIPTION: This project involves submittals, inspections, staging, scaffolding, traffic controls, protections, wood shingle roof repairs and replacements, minor carpentry repairs, debris removal, pressure cleaning, preservative coating, stain coating, priming, painting, cleanup, and closeout at the wood shingle roofs and their related features on five historic buildings in the historic Lower Town of Harpers Ferry National Historical Park, Harpers Ferry, West Virginia. The 5 project sites are the following building roofs:

1. The Tearney Building #38, dated to 1844; Park LCS00608 - roof area 1512sf., located at 787 Shenandoah Street

2. The Tearney Building Annex #39, dated to 1844; Park LCS00609 - roof area 510sf., located at 767 Shenandoah Street

3. The John Wilson Building #45, dated to 1825; Park LCS00556 - roof area 3350sf., located at 723 Shenandoah Street

4. The John Wilson Annex - historic outhouse - Building #45A, dated to 1825; Park LCS00560 - roof area 70sf., located at 723 Shenandoah Street

5. The Armorer’s Dwelling Building #48, dated to 1822; Park LCS00587 - roof area 1248sf., located at 575 Shenandoah Street

B. TOTAL ROOF AREA: These 5 building roofs comprise an approximate total of 6690sf of wood shingle area, rounded off to a project even number of 7000sf..

C. SITE WORK DESCRIPTION AND APPROXIMATE QUANTITIES: The contract scope of work includes:

1. Submittals and Required Work Plans

2. Staging, Safety, Materials, Protections, Signs, Mobile Equipment, screened Scaffolding, and Traffic Controls at each of the buildings and roofs, according to approved work plan.

3. Verification of Existing Conditions and quantities.

4. Site Inspections: To verify quantities of work, shingle location replacements, progress, quality, and completeness of work.

5. Wood Shingle Replacement: Contractor shall anticipate between 900 - 1000 square feet (10 squares) of wood shingle replacement to include the total roof area of Building 39 and in areas to be determined on a selective basis on the other 4 roofs.

Building 38 - Random selected wood shingle (perfections) replacement, mostly at the ridge line.

Building 39 - Total replacement of wood shingles with new (royals) , pressure preservative treated, approximately 510sf.

Building 45 - Random selected wood shingle replacement - pressure preservative treated (royals) - mostly at the roof and dormer ridge lines.

Building 45A - Random selected wood shingle replacement - pressure preservative treated (royals) - mostly at the roof and dormer ridge lines

Building 48 - Random selected wood shingle (royals) replacement, mostly at the ridge line.

5.A. Overnight Protection of Exposed Roofs: Contractor shall cover and secure all exposed roofs from rain and other elements.

6. Inspect and tighten 100sf of metal flashings at approximately 8 chimneys and 7 dormer windows.

7. Replace the rake boards on the east gable of Building 38 - approximately 50lf. Replace another 20 lf section on the northeast corner rake board of Building 45. Back prime new boards before installation.

8. Light Pressure Wash and Clean 4 Existing Wood Roof Surfaces: On buildings 38, 45, 45A, and 48, to remove all debris, dirt, mildews, and fungi in order to prepare the roofs for protective stain coatings.

9. Protective Roof Stain Coating Apply 2 coats of AMTECO water repellant preservative stain on the 7000sf area of wood shingles - all 5 building roofs - and on their related 300 linear feet of snowboards, both sides and all surfaces.

10. Painting - Clean, Prep, Prime, and Paint as follows over all 5 Buildings:

300lf of gutters and 300lf of downspouts

300sf of soffits and rake boards

210sf of 7 dormer windows on Building B45.

13. Cleanup - Practice site cleanup and cleanliness on a daily basis. Make a final sweep, clearance, and flush of all roof surfaces, gutters, and downspouts.

14. Close-out: Removal of Staging, Scaffolding, Equipment, Traffic Controls, and Materials; Site repairs; Provide Notebook (2 copies) of submittals and wood shingle roof maintenance manual (2 copies); submit bundles of any unused or extra wood shingles and cans of stains; and Contract Warranty for roof work.

HISTORIC BUILDINGS: These historic buildings are all on site for public view and are a vital part of the historic scene and interpretation of Harpers Ferry National Historical Park, National Park Service. They constitute an essential part of the national heritage which is the mission of the National Park Service to preserve for public education and the country's posterity. Buildings 38, 45, and 48 will be open for public visitation and government NPS employee use during the construction. The Contractor shall plan and maintain site staging, scaffolding, and protections to safely accommodate both his work as well as public access and egress from the buildings.

PERFORMANCE

Independently, and not as an agent of the Government, the Contractor shall provide the National Park Service with all plans; submittals; correspondence, labor, supplies, equipment, materials, construction, deliveries, inspections, waste removal, warranty, cleanup, close-out, and travel necessary to perform the following:

A. SUBMITTALS: Manufacturer's Literature; cut sheets; maintenance manuals, and product literature for wood shingles. Approval by Contracting Officer’s Representative required before starting work.

B. STAGING AREA: Establish and maintain a project staging area on an approved site with protections, parking limitations, vehicle access/egress restrictions in historic Lower Town.

C. PROTECTIONS: Provide and maintain building and site protections; staging, signs, barriers, delivery, parking, containments, lawn and landscape protections, contractor/employee protections, NPS personnel protections, visitor protections; and cleanup. All work will be performed according to OSHA safety standards.

D. DISPOSAL: Remove and dispose replaced items and debris off site and outside the park.

E. CONSTRUCTION: Perform the project scope of work to the satisfaction of the Contracting Officer .

F. CLEANUP & CLOSEOUT: Removal of Staging and Materials; Site repairs; Provide Notebook (2 copies) of submittals and wood shingle roof maintenance manual (2 copies); submit bundles of extra wood shingles and cans of stains; Contract Warranty.

G. WARRANTY: The Contractor shall provide the government with a one year warranty to guarantee the sustainability of the work.

SUBMITTALS

OPERATION PLANS: The Contractor shall submit Operation Plans to the Contracting Officer for review and approval: i.e. plans for staging, screened scaffolding, mobile equipment, storage; site use; signs, parking, traffic controls; deliveries; debris removal; cleaning; personnel safety, public safety; building and landscape protection; circulation; and fencing.

MOBILE EQUIPMENT: The Contractor may elect to use man lifts, scissors lifts, or other work related platform equipment to access work areas, as proposed in the submitted work plans and as approved by the Contracting Officer. NOTE: The Contractor must use either a manlift or scissor lift in front of Bldg. 45. Scaffolding must not be placed in the street. A flagman must be present when manlift or scissor lift is present in the street.

The Contractor shall comply with all regulations of OSHA, with the traffic controls of the National Park Service, with the traffic laws of the Town of Harpers Ferry, and the traffic laws of the State of West Virginia SAFETY PLAN: The Contractor shall submit a Safety Plan before commencement of work.

EXTRA QUANTITY OF MATERIALS: With completion of the job and as part of close-out, the Contractor shall provide the National Park Service with extra quantities of materials, such as any excess or left over wood shingles, assorted by type, and drums or cans of roof coating stain.

CONTRACTOR'S USE OF PREMISES

CONSTRUCTION CAMP: Establishment of a camp within the park will not be permitted.

CONDUCT: The Contractor shall at all times conduct his operations to ensure the least inconvenience to the public and shall install and maintain protections and screens on this staging and scaffolding to protect the public from his work. Screens must be either a dark green or brown color.

THE PARK WILL BE OPEN TO THE PUBLIC DURING CONSTRUCTION.

BUILDING ACCESS: The Contractor shall maintain access to the buildings for National Park Service administration and/or for the visiting public throughout the duration of the construction. Buildings 38 and 45 will be occupied and active with National Park Service business and public visitation. Building 48 is a residence and must have access/egress for the occupants. Building 39 contains a transformer to which the park must have access SCHEDULE COORDINATION: The Contractor shall coordinate the construction schedule and operations with the Contracting Officer’s Representative and shall abide by the approved plans for staging, storage, site use, safety, protection, cleaning, circulation, and fencing as per the review by the Contracting Officer’s Representative.

STORAGE OF MATERIALS: The Contractor shall confine storage of materials to the areas approved by the Contracting Officer’s Representative.

1. The Contractor shall assume full responsibility for the protection and safe keeping of products under this contract stored on the site.

2. The Contractor shall move any stored products, under Contractor's control, which interfere with operations of the Government.

PROTECTION: The Contractor shall provide, install, and maintain landscape and building features affected by contract work. Return staging area, building, and site to original condition after construction operations.

FIELD VERIFICATION

A. The Contractor shall field verify all existing conditions, dimensions, and quantities affecting the work of this contract before commencement of work.

DISPOSAL

A. The Contractor shall remove from the building, from the premises, outside the park, and deliver to a legal dump site all removal and debris related to the contract and his work.

B. The Contractor shall provide affidavits of legal disposal to the Contracting Officer.

CONSTRUCTION MATERIALS

A. The National Park Service shall furnish to the Contractor all drums of AMTECO stain, primer, and paint.

B. The Contractor shall furnish all other materials and equipment from outside the park.

PRODUCTS

WOOD SHINGLES:

A. QUALITY CONTROL: The Contractor shall provide the wood shingles, 10 squares equivalent to 1000 square feet, which shall be wood Certigrade Certi-label Cedar Roofing Shingles, as specified by the Cedar Shake & Shingle Bureau, and shall have the inspection and grade guarantee stamps, preservative treatment tags (Western Wood Preservers, Ltd. 604-857-1900) and affidavits upon delivery. All bundles shall have a “Certi Inspection label. If label is non-Certi inspection, the shingles will be rejected; see attached example of label on page 12.

1. Building 38 Wood Shingle Roof: Western Red Cedar Perfections. 1 square.

2. Building 39 Wood Shingle Roof: Western Red Cedar Royals pressure preservative treated. 6 squares.

3. Building 45/45A Wood Shingle Roof: Western Red Cedar Royals pressure preservative treated. 2 squares.

4. Building 48 Wood Shingle Roof: Western Red Cedar Royals. 1 square.

B. #1 PERFECTIONS “CERTI-LAST” Shall be Western Red Cedar wood shingles with 3/8 inch butt thickness, and 18” inches long to tapered edge, and 4 to 12 inches wide.

C. #1 ROYALS“CERTI-LAST” Shall be Western Red Cedar wood shingles with 1/2 butt thickness; 24 inches long to tapered edge; and 4 to 12 inches wide.

D. #1 ROYALS SHINGLE PRESSURE PRESERVATIVE TREATED: Shall be Western Red Cedar wood shingles with 1/2 butt thickness; 24 inches long to tapered edge and 4 to 12 inches wide.

NOTE: A potential source for the Western Red Cedar wood shingles is Capital Forest Products at (410) 280-6102.

PRIMERS, PAINTS, STAINS, and RELATED MATERIALS A. The Government will furnish all primers, paints, and stains for coating rake board, trims, and metal surfaces.

FINISH WOOD

A. SPANISH CEDAR: The Contractor shall provide the replacement rake boards, with sizes, thickness, and profiles to match replacement sections.

PRESSURE WASH CLEANERS

A. MILDECIDE CLEANING AGENT: The Contractor shall provide and use an approved biocide mildewcide in the pressure wash of the wood shingle roofs prior to AMTECO preservative treatment.

B. Proper hoses and nozzles for low pressure wash.

FASTNERS.

A. Pressure Treated Wood and Certi Last Pressure Treated Wood Shingles: The Contactor shall use nails and fasteners which are TYPE 316 stainless steel or most current type fasteners in accordance with standards.

B. Non Pressure Treated Wood and Shingles: The Contactor shall use nails and fasteners which are hot dipped galvanized conforming to ASTM A 153 and non-rust or most current type fasteners in accordance with standards.

STAGING, SCAFFOLDING, AND TRAFFIC CONTROLS

A. STAGING AND SCAFFOLDING: The Contractor shall provide, install, and maintain staging and scaffolding which shall meet OSHA standards, shall be installed in approved locations, shall be screened with green or brown screens and tarpaulins, without signage, with access/egress ladders, and with containments to prevent any falls, dangers to the visitors, and to prevent debris contamination.

1.. All Staging and Scaffolding shall be secured at the end of each day and at the end of each work week to prevent public access.

2.. Upon completion of work on all roofs the Contractor shall perform a final cleanup before dismantling and removing staging and scaffolding.

3. The Contractor scaffolding shall allow entry and exit by NPS personnel and by the visiting public into buildings 38, 45, and 48, with all protections necessary.

B. MOBILE EQUIPMENT: The Contractor shall comply with all safety regulations and OSHA when using man lifts, scissors lifts, or other work related platform equipment to access work areas, as approved by the Contracting Officer.

NOTE: The Contractor must use either a manlift or scissor lift in front of Bldg. 45. Scaffolding must not be placed in the street. A flagman must be present when manlift or scissor lift is present in the street.

C. TRAFFIC CONTROLS: The use of vehicles , equipment, and staging in the streets must meet the traffic safety requirements of the National Park Service , the Town of Harpers Ferry, and the State of West Virginia.

1. The Contractor shall provide temporary traffic controls, flagmen, signs, barriers, and lights as necessary to insure vehicle, visitor, and personnel safety around his work.

.DEMOLITION AND DISPOSAL

A.. The Contractor shall remove and discard the existing Building 39 wood shingle roof in a careful manner to protect the substrate and prepare it for the installation of the new wood shingle roof.

B. According to approved plan, the Contractor shall remove from the building roofs and dispose outside the park all construction debris.

C..The Contractor shall consider recycling the demolished wood shingle materials.

D. The Contractor shall sweep and blow vacuum clean the Building 39 roof substrate and all exposed rafter pockets (if any) before installation of the new wood shingle roof.

E. The Contractor shall protect and preserve in place the existing steel brackets, wood snowboards, gutters, brackets, hangers, downspouts, and fastners of Building 39 for reuse in the new wood shingle roof.

INSTALLTION OF NEW WOOD SHINGLES AND ROOF

A. The Contractor shall follow the specifications of the Cedar Shake & Shingle Bureau for the installation of Certi-label Shingles.

B. All shingles shall be installed with proper keyway widths, concealed fasteners, and offset joints.

C. Shingle starter courses (first course) shall be double thick.

D. Shingles shall project 1-1/2 inches beyond the fascia and approximately 1 inch over the gable or rake end.

E. Individual singles shall be spaced 1/4 inch to 3/8 inch apart.

F. There shall be two nails only for each shingle, approximately 3/4 inch from the edge and 1-1/2 inches above the exposure line.

G. The new wood shingle roof shall match existing exposures which are between 5-1/2 inches and 6 inches.

H. Alternative course joints should not align.

QUALITY DETAIL CONSTRUCTION

A.. Wood Shingle Installations as in-fills and replacements shall match the exposures and thicknesses of the existing roof into which they are integrated.

B. Lines of new wood shingles on roof ridges and on dormer window ridges shall match the combs and exposures which they replace and/or into which they are integrated.

C. The Contractor shall construct the new Building 39 wood shingle roof in much the same manner to resemble the existing but with the use of new wood shingle materials.

D. Avoid the over use of small narrow wood singles that are 4 to 5 inches wide. Do not install singles less than 4 inches wide.

PRESSURE WASH TO PREP WOOD ROOFS AND SNOWBOARDS

A. The Contactor shall employ light pressure wash using hoses, nozzles, water, and approved biocide/mildewcide to remove all dirt, debris, and biological growth from the surfaces of wood shingles which are to be preservative treated. The Contractor shall avoid damage to the wood shingles and other roof features.

B. The Contractor shall follow manufacturer's directions for use of biocides and mildewcides.

C. Allow pressure washed surfaces to completely dry before application of the AMTECO preservative.

D. Allow COR inspections and approval of pressure washed wood shingle roofs.

PRESERVATIVE,PAINTING,AND STAINING

A. AMTECO PRESEVATIVE: The Contractor shall apply 2 coatings on the wood shingle roofs and on the snowboards according to manufacturer's recommendations allowing for proper curing, drying, and protection between and after each coating.

1. Apply liberally and thoroughly to allow deep penetration of preservative into the wood surfaces.

2..Allow COR inspection of AMTECO preservative application results.

B. PAINTING AND STAINING - Wood and Metal: To include 1 coat of primer and 2 coats of finish.

1. The Contractor shall follow the best practices for cleaning and prep before priming and painting wood and metal surfaces.

2. The Contractor shall follow manufacturer's recommendations allowing for proper curing, drying, and protection between and after each coating.

3. The Contractor shall paint by brush only. Stain may be applied by using a small garden-style sprayer. Contractor shall prevent stain from running down into guttering, on sides of buildings, and onto sidewalks, etc.

REPLACE RAKE BOARDS:

A. New replacement boards shall match existing to be removed in widths, cross sections, and profile. New wood shall be spanish cedar.

B. The Contractor shall back prime and prime paint all cut edges of new rake boards before installations.

C. All new rake boards shall be installed with proper levels, alignments, butt ends tight fitted together, and without gaps.

ROOF INSPECTIONS

A. The Contractor shall anticipate daily and weekly inspections by the Contracting Officer's Representative (COR).

B. Each roof work is not complete and dismantle of scaffold shall not occur until after final inspections and approval by the COR.

PERSONNEL PROTECTIONS

A. The Contractor shall provide protections for personnel against dust inhalation, against debris contamination, and as appropriate for any phase of the contract work.

B. The Contactor shall enforce the use of proper personnel protection and safety.

PROTECTION OF WORK AND SITE

A. The Contractor shall protect all work against damage.

B. The Contractor shall correct any damage by cleaning, repairing, or replacing as acceptable to the Contracting Officer.

C. The Contractor shall prevent dust and debris from contaminating the buildings.

Daily Clean Up:

A. :During progress of work on a daily basis the Contractor shall remove from the site all discarded materials, rubbish, cans, and debris at end of each work day.

FINAL CLEANUP AND CLOSE-OUT

A. The Contractor shall clear the project work limits and sites of all debris, materials, equipment, scaffolding, vehicles, traffic controls, signs and staging.

B. The Contractor shall make all necessary repairs to the buildings and landscape where damages are caused by work.

C. The Contractor shall leave with the Contracting Officer the extra wood shingles assorted by type and size, the paints, and the extra stains left over and not completely used on the job.

D. The Contractor shall provide 2 copies of the Notebook of submittals and 2 copies of the wood shingle roof maintenance manual.

QUALITY ASSURANCE AND WARRANTY:

A. When work is acceptable and is complete, the Contractor shall inform the COR that the work is complete and ready for inspection. The COR will inspect the work on site. In the event that the work is not acceptable, the Contractor shall record a list of items noted by Harpers Ferry National Historical Park to be corrected. A subsequent inspection may take place in order to review the corrected items.

B. The Contractor shall provide the Contracting Officer with a 1 Year Warranty to cover workmanship.

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