A04_SOW_3801_S_Capitol_St_Exterior_Repairs_236154_NACE_.pdf

National Park Service U.S. Department of the Interior

REGION 1 – NATIONAL CAPITAL AREA

Facilities, Design and Construction Facilities Management Division

WASHINGTON, DC

STATEMENT OF WORK Page 1 of 16 5/3/2021

3801 S. CAPITOL STREET EXTERIOR REPAIRS (NACE)

National Park Service National Capital East (NACE) Washington, DC

PMIS No. 236154 Contract No. NCR to Assign

STATEMENT OF WORK FOR CONSTRUCTION SERVICES

PART 1: GENERAL

1.1 DESCRIPTION OF WORK

Statement of Work (SOW) consists of exterior repairs to the National Park Service property located at 3801 South Capitol St, SE, Washington, DC. The repairs include a full replacement in-kind of the slate shingled roof on the main building and garage, including new aluminum gutters and downspouts. The project also includes repairs to the front portico, and roof replacement of the south entrance atrium roofs, repainting the deck, and repairs to the window sashes and frames. All work items will be repairs or replacement in-kind to match the existing conditions. All work must be performed in a manner that allows the building to remain open for staff during the duration of work.

All work will follow the Secretary of the Interior’s Standards for Treatment of Historic Properties and follow the Guidelines for the Treatment of Historic Properties.

The contract work includes:

1. Mobilization, including providing all labor, equipment, and materials necessary to perform work adhering to the requirements of this SOW.

2. File all plans, prepare all documents, and obtain all necessary approvals of all governmental departments having jurisdiction to complete work. Obtain all required permits and pay all fees associated with permits.

3. Removal and replacement in-kind of the slate shingled roof on the main building, approximately 2000 SF of roof area, to include:

a. Selective demolition of existing slate shingles and underlayment.

STATEMENT OF WORK Page 2 of 16 5/10/2021

b. Selective demolition and replacement of 100 SF of roof decking, and sistering of one rafter. Selective demolition and replacement of trim/fascia as required to perform work.

c. Installation of underlayment at all roof areas.

d. Installation of Ice and Water underlayment under all metal flashings and penetrations, and at eaves.

e. Installation of new 14” x 20” slate shingles on main building to match existing.

f. Installation of all new 16-gauge copper flashings at all penetrations, ridges, step flashings, and other miscellaneous flashings.

g. Installation of copper nails, fasteners, sealant, and any accessories required to perform

h. Installation of new copper loop snow guards in a two-row staggered pattern.

i. Removal of ivy and vegetation on west façade, downspouts, and roof eave.

4. Main Building: Installation of new 6” aluminum gutters and downspouts to facilitate proper drainage from all roof areas. Work items include:

a. Use of all new 20-gauge (.032”) Kynar coated aluminum gutters and downspouts.

b. Remove and replace all existing gutters and downspouts. Reinstall with new gutter hangers and straps. Integrate gutter flashing with adjacent roofing for watertight installation.

c. Provide all work and accessories necessary to ensure proper water drainage for the gutter and downspout system to include but limited to fasteners, gutter hangars, cleats, straps, anchoring devices, strainers, flashing, and sloping.

5. Repairs to the front (east) portico, to include:

a. Removal and replacement of the flat copper roof above the portico. Include installing roof and flashing into masonry wall. Includes removal and reinstallation of railings as required to perform work.

b. Repairing portico columns, to include replacing missing wood blocking, fasteners, and anchors. Replace decayed or unserviceable wood trim and components of portico.

c. Remove existing paint and repaint in kind all wood elements of portico.

6. Repairs to the back (west) deck, to include:

STATEMENT OF WORK Page 3 of 16 5/10/2021

a. Removing the existing paint and repainting the iron railing on the deck and stairs.

b. Removing the coating from the deck, and recoating with waterproofing membrane.

7. Replacement of the south entrance and atrium roofs:

a. Removal and replacement in-kind of the slate shingled roof over the south entrance

(50 SF).

b. Removal and replacement in-kind of the copper roof over the first floor, south elevation (50 SF).

c. Scraping and painting of wood trim and elements adjacent to south entrance roof.

d. Includes all work, hardware, and accessories required to perform work.

8. (BID OPTION) Removal and replacement in-kind of the slate shingled roof on the garage, approximately 600 SF of roof area, to include:

a. Selective demolition of existing slate shingles and underlayment.

b. Selective demolition and replacement of 120 SF of roof decking, and 100 LF of trim/fascia required to perform work.

c. Installation of underlayment at all roof areas.

d. Installation of Ice and Water underlayment under all metal flashings and penetrations, and at eaves.

e. Installation of new 14” x 20” slate shingles on garage to match existing.

f. Installation of all new 16-gauge copper flashings at all penetrations, ridges, step flashings, and other miscellaneous flashings.

g. Installation of copper nails, fasteners, sealant, and any accessories required to perform

h. Installation of new copper loop snow guards.

i. Removal of vegetation of slate roof and on east, south, and west facades.

9. (Bid Option) Garage: Installation of new 6” aluminum gutters and downspouts to facilitate proper drainage from all roof areas. Work items include:

a. Use of all new 20-gauge (.032”) Kynar coated aluminum gutters and downspouts.

STATEMENT OF WORK Page 4 of 16 5/10/2021

b. Remove and replace all existing gutters and downspouts. Reinstall with new gutter hangers and straps. Integrate gutter flashing with adjacent roofing for watertight installation.

c. Provide all work and accessories necessary to ensure proper water drainage for the gutter and downspout system to include but limited to fasteners, gutter hangars, cleats, straps, anchoring devices, strainers, flashing, and sloping.

10. (Bid Option) Restoration of window and door sashes and frames. Work items include:

a. Class I maintenance to windows, except as noted in window repair schedule. Class I maintenance includes: paint removal; removal and repairs to sash, including reglazing;

repairs to the frame, weatherstripping and reinstallation of the sash, and repainting.

b. Replacement of one missing window unit to include new lite, frames, sash, and security bar at select location as noted on drawings and window repair schedule.

c. Class I maintenance to exterior doors as noted in door repair schedule. Class I maintenance includes: paint removal; removal and repairs to sash, including reglazing;

repairs to the frame, weatherstripping and reinstallation of the sash, and repainting.

d. Work includes all equipment and accessories required to perform work, including but not limited to fasteners, trim, anchors, and access equipment.

Attachments

1. Standalone Specifications Section 073216 Slate Shingles

2. 3801 S. Capitol St Exterior Repair Drawings.

3. Transmittals Form (Submittals)

1.2 LOCATION AND ACCESS

Job Site: The project site is located at 3801 South Capitol Street, SE, Washington, DC.

Staging: Staging and parking for vehicles, equipment and materials shall be confined to the parking lot and areas on the property as directed by the COR.

Access: Access the facility via S. Capitol St and US-295. Access is best from the southbound lanes of South Capitol Street.

1.3 PERSONNEL QUALIFICATIONS

A. All personnel performing work shall be fully qualified and experienced in the type of work to be executed in this contract. When applicable, personnel shall be certified in the necessary

STATEMENT OF WORK Page 5 of 16 5/10/2021 work for which being performed by that person. The COR may at any time request copies of necessary certifications.

1.4 CONTRACTOR-FURNISHED ITEMS

All necessary supervision, personnel, equipment, tools, transportation, supplies, materials and incidentals required to perform the work of the contract in a safe, professional manner.

All necessary pedestrian controls to restrict visitors from accessing the work areas.

1.5 WORK CONDITIONS AND LIMITATIONS

Project Officers and Inspection

1. The Contracting Officer (CO) is the only person with authority to enter into, administer, modify and/or terminate the contract.

2. The Contracting Officer’s Representative (COR) is a program official designated by the CO to assist in administering technical aspects of the contract. The COR cannot modify the contract.

3. The Construction Control Inspector (CCI) or Project Inspector (PI) is a program official designated by the CO to assist the COR with day-to-day documentation of contract activities and other contract administration activities. The CCI/PI cannot modify the contract.

Facility Use:

1. 3801 S. Capitol Street is used by the United States Park Police with only NPS and USPP staff using the facility. The building shall remain open to staff during the duration of the project. The facility and property are not open to the public or visitors.

Required Performance Period

1. Work performance shall be completed 120 days from the date of contract award.

2. Onsite construction activities must occur between the hours of 6:30 AM and 5:00 PM Monday through Friday.

3. No work is allowed on Federal holidays or weekends, unless approved in advance.

4. Exemptions to these requirements may be requested of the CO five (5) days prior to the scheduled change and must be approved by the Park Superintendent.

Contractor’s Use of Premises

1. Confine on-site material storage, equipment and vehicle parking, and staging to paved parking areas or other areas specifically designated by the COR.

STATEMENT OF WORK Page 6 of 16 5/10/2021

2. Keep job site clear of trash and debris. Dispose of any trash, debris and other unusable material legally at authorized facilities on non-Federal land.

3. If entering the building, contractor will require USPP escort. Contractors required to have valid identification and be on authorized project personnel list.

4. Contractor shall not enter premises outside of submitted project schedule unless previously coordinated by COR at least 24 hours prior to requested time.

Existing Utilities

1. The Contractor is responsible for locating and preventing damage to known utilities.

2. Damage to known utility services by the Contractor requires immediate repair at no additional cost to the Government.

3. Damage to unknown utility services, will result in an equitable adjustment in the contract price for repairs as approved by the CO in accordance with the applicable FAR clause.

4. Interruption of existing utilities service must have prior approval from the COR.

Field Verification

1. The measurements and quantities specified are estimated and provided for information only. The Contractor shall verify all dimensions and conditions affecting the work.

2. The Contractor shall notify the COR of any significant deviation in measurements and quantities that will affect the intended outcome of the project or result in a change of cost or time to complete the work.

Quality Control Development and Monitoring

1. Develop and implement a construction quality process to ensure work conforms to the requirements of the contract.

2. Assign a competent and experienced person to oversee the construction of this project with the authority to stop or correct work due to unsatisfactory materials or workmanship.

3. Perform quality control inspection, and documentation and process control sampling and testing as required by applicable standards.

Site-Specific Conditions and Limitations

1. The following conditions may be applicable to work sites inside Park boundaries:

a. Weather – Sudden and dramatic changes in climate conditions are common. The Contractor must be prepared to alter work plans and provide protection for workers and equipment.

STATEMENT OF WORK Page 7 of 16 5/10/2021

b. Site Security – This facility is not open to the public, however no designated security exists at this location. Park law enforcement officers and other staff will not be designated to provide extra security to protect project sites from visitor intrusion.

Therefore, it is the responsibility of the Contractor to take measures to prevent vandalism, theft, or destruction of project materials and equipment. Any proposed security measures that may affect ongoing access or use of areas otherwise not already included in the construction zone (including remote security cameras or alarms) must be approved by the COR prior to use. Any security issues must be reported to the COR immediately upon notice. Park law enforcement staff may request official statements or other information from Contractor personnel needed to follow up on reported issues.

c. Resources – As a unit of the National Park System, the Park is tasked to preserve unimpaired its natural and cultural resources and values. The Contractor must make every effort to ensure no impacts are made deleterious to these resources. It is expected that the project site and access areas will be minimally impacted only as absolutely necessary for the performance of contract requirements. Mitigations approved by the COR will be taken to restore pre-existing conditions.

d. Wildlife – All wildlife is protected within the Park boundaries, and some species, which occur within the Park, receive special State and Federal protection due to their rare, threatened or endangered status. Very few wildlife species present any danger to persons working within the Park. Even species which have the potential to do harm to persons, can usually be avoided. Unless wildlife is presenting an immediate threat to persons, harassment or destruction of wildlife is prohibited.

2. Project-specific environmental or cultural compliance mitigations: The following items are required by the National Environmental Policy Act and National Historic Preservation Act as applied to this project and may be described further in other sections of this statement of work:

a. The facility is assumed to be historic in nature and will have an in-kind appearance and replacement of existing components. Until historical documentation of this building has been completed, it will be assumed to be eligible for the National Register of Historic Places.

1.6 QUALIFICATIONS, CONDUCT, AND APPEARANCE OF CONTRACTOR’S EMPLOYEES

A. All Contractor's employees must be able to communicate in the English language with the

Government's representative.

B. The Contractor shall require their employees to comply with the instructions pertaining to conduct and building regulations issued by duly appointed COR.

C. The Contractor shall be required to remove personnel in its employment on this contract for the following reasons:

1. Disrespect to either park employees or visitors during performance of the contract.

STATEMENT OF WORK Page 8 of 16 5/10/2021

2. Personal conditions. Using illegal drugs, drinking alcoholic beverages, intoxicated behavior or unsafe work habits.

3. Misconduct of any kind.

4. Under circumstances set out in paragraphs above, the contractor shall be responsible for immediate removal of his/her employees. When it is necessary to remove personnel, the contractor shall immediately furnish a replacement/replacements to carry out the work to be performed under this contract.

D. The Contractor's employees shall wear a shirt, coveralls, or other uniform item of a distinctive color bearing his/her identification. Uniform shall bear the Contractor’s name or logo.

Employee clothing shall be kept reasonably clean and neat in appearance.

E. Vehicles: If company-owned, shall have the contractor’s name and logo on each side of the vehicle. Employees using personal vehicles shall display a park provided vehicle pass within the vehicle. Employees shall park in legal parking spaces within the park. Park vehicle pass does not apply to parking on MD streets or private parking areas.

1.7 PRECONSTRUCTION CONFERENCE

A. A pre-work conference will be conducted between the National Park Service Contracting Officer (CO) and the Contractor prior to the beginning of the work. The Contractor shall designate in writing at this meeting the names, telephone numbers, and addresses of all supervisors. The Contractor or his/her supervisor shall be available at all times when the contract work is in progress to receive notices, reports or requests from the CO or the COR.

B. The contractor shall provide to the COR a complete list of all employees under this contract.

The list shall include individual tours of duty and schedules of work assignments. An updated list will be submitted five (5) days prior to the start of the contract and as any personnel or schedule changes are made.

1. All contractor personnel shall carry valid government identification while on the premises.

1.8 REPORTS

A. The contractor shall maintain a daily work log recording the quantities of work performed and the locations. If requested a copy shall be filled with the COR on a daily or weekly basis.

B. The contractor shall note and report to the COR in writing the presence of any conditions that need to be addressed and cannot be corrected within the scope of work described herein. If so directed by the COR the contractor shall provide a proposal for performing the prescribed work that includes a breakdown with unit prices for labor, materials, and equipment required to perform the task(s). The COR will evaluate the proposal and if valid will seek approval from the Contracting Officer. Failure of the contractor to obtain the approval of the

STATEMENT OF WORK Page 9 of 16 5/10/2021

Contracting Officer for work beyond the scope of the contract will release the government from any obligation to pay for services claimed.

1.9 PROCEDURES FOR MEASUREMENT AND PAYMENT

A. Payment will be included under the quoted line item to which this work relates. Invoices must match these line items.

B. All invoices must be verified and approved by the COR prior to payment.

C. Invoices accompanied by acceptance reports that have been signed by the COR shall be submitted by the Contractor through the Internet Payment Platform (IPP) System.

1.10 QUALITY ASSURANCE

All materials and methods used for this contract must meet or exceed the current local, State and Federal codes, standards and regulations applicable to the contract work.

All personnel performing work under this contract shall be trained and skilled in the trades required to complete the contract requirements.

Contractor performing work shall have completed at least three projects of similar scope within the previous five years.

1. See Specification Section 073126 for Slate Roofing Contractor requirements.

The contractor shall have completed at least three projects on structures listed in the National Register of Historic Places in the previous five years.

Quality Assurance Plan

1. Work performed under this contract shall be subject to inspection and approval by the

COR. Careless performance will not be acceptable. Any corrective actions or other form of addressing the documented concern/issues shall be addressed and mitigated, or provided with a timeline for being addressed with appropriate identified method, within eight (8) hours from the time of notification with approval as such from the COR.

2. The Contracting Officer may deduct a specified amount on the contract for inadequate or non-performance based on an estimated cost or actual cost of park service or other methods of procuring the service.

Unsatisfactory Work

1. Any omitted or unsatisfactory work which does not clearly fall into one of the categories on the Deduction Table will be deducted at the hourly rate indicated on the Deduction Table multiplied by the hours required to perform the omitted or unsatisfactory work.

1.11 REFERENCE STANDARDS: Perform all work in accordance with the most recent edition of the following standards unless otherwise instructed.

STATEMENT OF WORK Page 10 of 16 5/10/2021

ANSI American National Standards Institute ASCE American Society of Civil Engineers ASTM American Society for Testing and Materials AWC American Wood Council CDA Copper Development Association IBC International Building Code NFPA National Fire Protection Association NSA National Slate Association OSHA Occupational Safety and Health Administration

1.12 SUBMITTAL PROCEDURES

Refer to Submittal Transmittal form for required submittal items. Contractor is responsible for additional submittals that may be required. Electronic forms are available.

Until the Contractor receives approval from the CO, no construction material or other items requiring the CO’s approval may be ordered, delivered, or used for the purposes of this SOW.

Unless otherwise instructed by the CO, send construction material and other items requiring approval to the CO. Provide one (1) electronic copy of each submittal unless otherwise specified. Forward related material as a package. Reference the section number of this SOW on each submittal. Allow 14 days for review and approval.

The CO will indicate in writing the approval or disapproval of each submittal, the reason for any disapproval, and any resubmission requirements.

There will be no waiver of any required submittal unless authorized by the CO. The CO may request submittals other than those specified in this document.

Product Data:

1. Submit manufacturer’s data for all materials. Data shall be annotated to show the specific material identification information, catalog number, type, color, and size of each item.

2. Submit shop drawings for typical slate shingle details, to include but not limited to valleys, ridges, flashings, headlaps, offsets, and underlayment.

3. Submit shop drawings for typical gutter and downspout anchoring, attachment, and seams.

4. Manufacturer’s typical details are acceptable, as appropriate.

5. Color samples are required for paint and coatings.

1.13 ENVIRONMENTAL REQUIREMENTS

A. The Contractor shall comply with all existing Federal and District government regulations pertaining to hazardous material use, storage and disposal. Materials and chemicals shall be stored, used and disposed of in such a manner as to not endanger or threaten the environment and the health and safety of the community of Washington, DC and Park employees. All generated waste shall be disposed of legally at the completion of each day's work.

STATEMENT OF WORK Page 11 of 16 5/10/2021

1. Lead based paints are expected to be present on the wooden elements of the fenestrations, portico, and trim/fascia based on the assumed construction date of the facility. Remove and dispose lead paint components according to OSHA guidelines.

PART 2: MATERIALS

2.1 SLATE SHINGLE ROOFING: SEE ATTACHED STANDALONE SPECIFICATION

SECTION 073126 FOR SLATE SHINGLE SPECIFICATIONS.

2.2 MISCELLANEOUS CARPENTRY MATERIALS

1. Replace existing trim, roof decking, blocking, and associated lumber with in-kind materials as required. Contractor to verify existing materials dimensions.

2. Construction or No. 2 grade lumber or better, Species Hem-fir, Douglas-Fir, or Southern Pine. Maximum 15% moisture content.

2.3 GUTTERS, DOWNSPOUTS, FLASHINGS, AND ACCESSORIES

Gutters and downspouts:

1. Minimum .032” (20-gauge) seamless aluminum gutters and downspouts

2. Kynar finished

3. 6” sized gutters

Gutter Guards to fit.

C. See Specification Section 073126 for Slate Roofing Copper Flashings.

2.4 COATINGS AND PAINT

A. Provide coatings and paint compatible for use within each system that are compatible with one another and substrates indicated, under conditions of service and application as demonstrated by manufacturer, based on testing and field experience.

B. West Deck Coating: Provide suitable polyurethane, PUMA, PMMA, or similar pedestrian waterproofing coating for the concrete deck, textured for pedestrian purposes and colored to match existing.

C. VOC Content: Provide paint and coating that comply with VOC content limits of the local jurisdictions.

D. Colors: As selected from manufacturer’s full range to match existing. Contractor to provide color samples for approval prior to application.

PART 3 EXECUTION OF WORK

STATEMENT OF WORK Page 12 of 16 5/10/2021

3.1 GENERAL

Service Interruption

1. Maintain utility services to building during construction.

2. Temporary interruptions of utility services must be approved by the COR prior to the interruption. Contractor must give COR 72 hour notice prior to interruption of services.

Information detailing expected time and duration of the interruption will be required.

3. Maintain a clean environment for occupants during construction. Provide temporary controls to prevent dust and ceiling materials from entering the interior of the building during tearoff, deck replacement, and roof replacement.

Site Investigation: The Contractor is responsible for investigating existing conditions and site conditions in the vicinity of the required work including location of existing utilities, or any other hazards or obstacles which may increase time or cost of the work.

Changes to Construction Methods

1. Any proposed change by the Contractor to the specified construction methods must be submitted in writing to the CO along with the justification for the proposed change.

2. Approval from the CO is required for changes in specified construction methods.

3.2 EXECUTION

The following work items required for this Statement of Work. Refer to Section 1.1, the requested bid items, and reference drawings to determine required and any additive work items.

Mobilization and Demobilization

1. Confine staging and parking for vehicles, equipment, and materials to paved areas and parking areas as approved by the COR.

2. Contractor must provide for methods to appropriately secure equipment and materials.

3. Access site only by methods described in Section 1-2.

Refer to standalone Specification Section 073126 for Slate Shingle Roofing Instructions.

Gutters and Downspouts

1. Remove and dispose of all existing gutters. Install new gutters with with new straps, hangars, and counter-flashing necessary to prevent water from migrating behind gutter system. Slope gutters not less than 1/8 inch per foot.

STATEMENT OF WORK Page 13 of 16 5/10/2021

2. Remove and dispose of all existing downspouts. Install all new downspouts with new hardware. Flash and seal gutters to downspouts as necessary.

3. Install new continuous gutter guards on gutters.

Portico

1. Rehabilitate Portico, including paint removal, repairing, and repainting of existing wood components. Replace decayed or missing wood trim and components as necessary.

2. Install new wood blocking at the base of damaged portico columns. Inspect columns, including attachment to masonry deck, and install new post anchors as required.

3. Remove existing paint and repaint in kind all wood elements of portico.

4. Remove and replace with new materials, solid copper roof above the portico. Include installing roof and flashing into masonry wall. Remove and reinstall railings as required to perform work.

West Deck

1. Remove existing paint on concrete deck. Reinstall with new suitable pedestrian traffic/ waterproofing coating. Install coating per manufacturer’s recommended instructions.

2. Conduct maintenance and repairs to cast iron railing on west deck, including removal of existing paint and installation of new paint. Refer to NPS Preservation Brief 27 for paint removal and reinstallation recommendations.

Miscellaneous Roofs

a. Remove and replace in-kind the slate shingled roof over the south entrance. Refer to

Specification Section 073126 for slate roof instructions.

b. Removal and replacement in-kind of the copper standing seam roof over the first floor atrium, south elevation (50 SF).

i. Refer to Copper Development Association (CDA) Architectural Details for typical standing seam copper roof details and standards.

c. Scraping and painting of wood trim and elements adjacent to south entrance roof, and south atrium roof.

d. Includes all work, hardware, and accessories required to perform work.

Fenestration Maintenance Repairs

1. Conduct Repair Class I: Routine Maintenance of windows and doors according to window repair schedule. Repair Class I refers to NPS Preservation Brief 9: The Repair of Historic Wooden Windows.

STATEMENT OF WORK Page 14 of 16 5/10/2021

a. Repair, restore, and/or preserve windows sashes, frames, and adjacent wood components within the rough opening. See contract drawings for window repair schedule.

b. Includes some interior paint, and exterior paint removal; removal and repair of sash, including reglazing; repairs to the frame; weatherstripping and reinstallation of sash;

and repainting.

c. Do not use heat treatment to remove paint.

2. Conduct limited Repair Class II: Stabilization and Class III: Splices and Parts

Replacement of select windows according the NPS Preservation Brief 9: The Repair of Historic Wooden Windows.

a. Repair window frames or replace/splice window frame parts, to include jambs and sill where decay or rot cannot be repaired. See contract drawings for window repair schedule.

3. Work includes all equipment and accessories required to perform work, including but not limited to fasteners, trim, anchors, and access equipment.

4. Paint wood components to match existing color with non-latex paint per manufacturer’s instructions.

5. Protect all window lites during project work. Replace any lites broken during the course of the project work.

Notification Requirements

1. Notify the COR when the east and west decking is removed to observe the condition of the existing deck beams.

2. The COR or other authorized representative of the CO shall be present during any required testing.

3. The contractor shall notify the COR of any visits to the project by any manufacturer’s representative for warranty or other technical review purposes.

Warranty

1. The contractor shall warrant all labor, materials, and installation provided under the terms of the scope of work for one (1) year from the date of completion and acceptance by the government.

a. See Specification Section 073126 for Slate Shingle Warranty.

STATEMENT OF WORK Page 15 of 16 5/10/2021

2. The contractor shall furnish the NPS with all manufacturer warranty information for materials and parts provided under the terms of the scope of work.

PART 4 PROJECT CLOSEOUT

4.1 Cleanup

Remove all tools, equipment, excess materials, construction debris, and trash from the project site.

Legally dispose of trash, debris and all excess and unusable materials at authorized facilities off Government property.

Restore or refinish any surfaces damaged during performance of the contract work.

Remove grease, dirt, stains, foreign materials, and labels from finished surfaces.

Leave project site clean and ready for use at the time of final inspection.

4.2 Final Inspection and Acceptance of Work

When all work including site restoration and cleanup has been completed, the Contractor shall contact the COR to arrange the final inspection.

The final inspection should be conducted by the COR within five (5) working days after receipt of the Contractor’s request.

The Contractor will be notified of any deficiencies found during the final inspection.

After all deficiencies have been corrected and all required closeout submittals have been forwarded to the COR, the CO will issue a letter of final acceptance and request the release of claims.

4.3 Closeout Submittals

Provide to the COR the following closeout submittals and any other closeout submittals required by the CO.

Provide operation and maintenance documentation

1. One hardcopy binder with the following components:

a. Table of Contents

b. Cut sheets of all installed materials and equipment

c. Manufacturer’s operation instructions

STATEMENT OF WORK Page 16 of 16 5/10/2021

d. Manufacturer’s maintenance instructions

e. As-built drawings (See previous applicable requirements in this SOW)

f. USB thumb drive with PDF of all documentation and project photos

2. Provide one draft electronic copy (pdf) of all documentation for approval by COR prior to printing final version.

Provide one on-site training session for NPS staff.

1. Conduct training session to effectively instruct NPS maintenance staff on proper operation and maintenance (O&M) of the installed system according to manufacturer supplied instructions.

2. Coordinate date of training with COR.

3. Provide final O&M documentation at or before training session.

END OF STATEMENT OF WORK

SLATE SHINGLES SPECIFICATIONS

NACE – 3801 S. CAPITOL ST EXTERIOR

REPAIRS

1 JUNE 2021

PMIS No. 236154

SLATE SHINGLES

073126-1

SECTION 073126 SLATE SHINGLES

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions, apply to this Section.

1.2 SUMMARY

A. This Section includes the following:

1. Slate shingles.

2. Felt underlayment.

3. Self-adhering sheet underlayment.

4. Fasteners.

5. Sheet Metal Flashing.

B. All other related work items are located within the contents of the Scope of Work. This is the only standalone specification section included in the contract documents.

1.3 REFERENCES AND STANDARDS

A. Comply with applicable requirements of the most recent editions of the following standards and others specified in this section. Where these standards conflict with other specified requirements, the most restrictive requirements shall govern.

1. National Slate Association – Slate Roofs: Design and Installation Manual, 2010 Edition

2. ASTM C406 – Standard Specification for Roofing Slate.

3. ASTM D226 – Standard Specification for Asphalt-Saturated Organic Felt Used in roofing and waterproofing.

4. ASTM D4869 – Standard Specification for Asphalt-Saturated Organic Felt Underlayment

Used in Steep Slope Roofing.

5. ASTM D1970 – Standard Specification for Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection.

1.4 SUBMITTALS

A. Product Data: For each type of product indicated, including but not limited to:

REPAIRS

073126-2

1. Underlayment(s) and underlayment fasteners. Product data for the underlayment must include the ASTM Standard to which it complies.

2. Slate shingles and slating nails.

3. ASTM C406 test results for specified slate (including ASTM C120, Flexure Testing of

Slate (Breaking Load), ASTM C121, Water Absorption of Slate, and ASTM C217, Weather

Resistance of Slate).

a. Testing must be conducted in accordance with the most recent version of these standards.

b. Test results must be less than 3-years old and be conducted on slate from the quarry from which the slate is to be obtained and from the quarry listed in the Letter of Confirmation.

c. Testing shall be conducted by and reported on the letterhead of an NSA approved testing laboratory – see NSA’s website, www.slateassociation.org for approved labs.

B. Samples for Initial Selection: Of each color, size, texture, and shape.

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

C. Samples for Verification: For the following products, of sizes indicated, to verify color selected.

1. Slate Shingle: Three (3) full size, of each color, size, texture, and shape, with nail holes punched.

2. Slating nails and fasteners, of each type, length, and finish.

3. Slate hooks.

4. Slate repair material.

D. Shop Drawings: Scaled drawings showing shapes, sizes, and color of slate for typical details, including information on method of attachment, underlayment(s), and flashings.

E. Warranty: Special warranty specified in this Section.

F. Certificate of Origin for each type of slate to be delivered to the job site, identifying the country in which the shingles were quarried.

1.5 QUALITY ASSURANCE

A. Source Limitations: Obtain each color of slate from a single quarry capable of producing slate of consistent quality in appearance and physical properties. Slate shall have been quarried from North America.

REPAIRS

073126-3

B. Slate roofing contractor shall be a member in good standing of the National Slate Association, www.slateassociation.org.

C. Slate roofing contractor shall have at least 10-years experience in the installation of new slate roofing/repair of existing slate roofing and shall have successfully completed at least three slate roofing projects within the past 5-years similar in scope and scale to the Project specified herein. Foreman or superintendent shall have similar experience and shall provide full time supervision of installers.

D. Mockups: Build mockups to verify selections made under sample submittals and to demonstrate aesthetic effects and set quality standards for materials and execution.

1. Installation of slate shingles at roof eave, including starter, first, second, and third courses, underlayments, and drip edge metals, 5 linear feet.

2. Approach slates at ridge, 3 to 4 courses, 5 linear feet.

3. Slate shingle roofing, 100 square feet.

4. Approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion.

E. Preinstallation Conference: Conduct conference at Project site.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Store underlayment rolls on end on pallets or other raised surfaces. Do not double-stack rolls.

1. Handle, store, and place roofing materials in a manner to avoid significant or permanent damage to roof deck or structural supporting members.

B. Protect unused underlayment from weather, sunlight, and moisture when left overnight or when roofing work is not in progress.

C. Deliver slate shingles to project site in quarry crates/pallets with each labelled with the source, country of origin, size, quantity and color contained in each pallet.

D. Slate shingles shall be packaged on edge and separated by wood lath or other rigid material if rows are stacked vertically in the crate/pallet.

E. During extended periods of storage on site, tarp or otherwise cover the pallets/crates to keep the shingles clean and prevent them from freezing together during cold weather.

F. Store crates/pallets at site on a solid, level surface and handle shingles to prevent chipping breakage, soiling or other damage.

REPAIRS

073126-4

G. Load slate shingles on the building in a manner to avoid damage to the roof deck, structural supporting members, staging and scaffolding.

H. Store accessory materials including nails, slate hooks, underlayment, and ice dam protection membrane according to the manufacturer’s recommended storage instructions.

1.7 PROJECT CONDITIONS

A. Environmental Limitations: Proceed with installation of self-adhering sheet underlayment only within the range of ambient and substrate temperatures recommended by manufacturer.

1.8 SEQUENCING/SCHEDULING

A. Schedule and execute work to prevent leaks and excessive traffic on completed work sections.

Coordinate work with interfacing, adjoining, and related roofing work for proper sequencing of each installation.

1.9 WARRANTY

A. Special Roofing Installer's Warranty: Warranty, on warranty form at end of this Section, signed by roofing Installer and covering Work of this Section, in which roofing Installer agrees to repair or replace slate roofing that fails in materials or workmanship within the following warranty period:

1. Warranty Period: Five years from date of Substantial Completion.

2. Additional Installer Warranty: The roofing installer agrees to return to the job site one year to 18 months from the date of substantial completion of work (whichever is shorter and allows one full winter season) to replace any broken or missing slates created as a result of normal, installation-related shedding.

B. Slate Shingle Supplier Warranty: Submit slate shingle supplier warranty, signed by the supplier and covering the slate shingles described in this Section, in which the supplier agrees to replace slate shingles that fail in materials and deliver the replacement slate to the original point of destination. The duration of this warranty shall be 20 years from date of original supply.

1.10 EXTRA MATERIAL

A. Provide an additional 3 percent of installed field, starter, and ridge slates, for Owner’s use in future roof maintenance.

REPAIRS

073126-5

PART 2 - PRODUCTS

2.1 SLATE SHINGLES

A. Standard: New slat shall comply with ASTM C406, Standard Specification for Roofing Slate, Grade S-1; hard, dense, and sound natural stone, with chamfered edges. No broken or cracked slates will be accepted and exposed corners shall be full [and no broken exposed corners exceeding 1” will be allowed]. Broken covered corners shall not prevent the laying of a weathertight roof and the slate shall not be installed when either the base or leg of the right triangle broken off exceeds 2”.

1. Breakage of all kinds, including broken upper and lower corners exceeding the dimensions specified above, shall not exceed 1% in the shipment delivered to the site

2. Acceptable manufacturers include:

a. New England Slate Co.

b. Buckingham-Virginia Slate Corp.

c. Newmont Slate Company

d. Penn Big Red Slate Co, Inc

e. Evergreen Slate Company.

f. Greenstone Slate Company, Inc.

g. Approved Equal from United States Origin.

3. Source and color of slate:

a. Vermont, Pennsylvania, New York, or similar

1) Semi-Weathering Gray

B. Size:

1. Length: Single length 20”

2. Width: Standard width 14”

a. Wider slates as needed for approach slates and slates adjacent to valleys, hips, vertical walls, etc.

3. Thickness: Nominal 1/4 inch.

4. Starter slates: 12” L x 28” W

REPAIRS

073126-6

5. Nail Holes: Two per shingle.

C. Shape: Rectangle.

D. Color: Grey or Grey-Black. To match existing and as approved by COR.

1. Weather-Exposure Color Change: Semi-Weathering.

2. Texture: Medium or Smooth

2.2 SLATING NAILS

A. Slating nails shall be sharp-pointed with a 3/8-inch diameter flat head.

1. Material: Solid copper

2. Thickness/Shank Diameter: 10-gauge (.134”)

3. Length: 1-3/4”

4. Shank: Smooth, annular ring

2.3 UNDERLAYMENT MATERIALS

A. Saturated Felt Underlayment: ASTM D 226, Type II, asphalt-saturated organic felt, 36” wide rolls, or ASTM D4869 Type IV.

1. Available Products:

a. “Gorilla Guard Spec 30,” Atlas Roofing Corporation, Atlanta, GA 30328, (800) 251-2852

b. “#30 ASTM,” Warrior Roofing Manufacturing, Chambersburg, PA 17201, (717) 709-0323

c. “No. 30 ASTM” or “No. 30 UL,” Tamko Building Products, Joplin, MO 64802,

(800) 641-4691

d. Approved equal.

B. Ice Dam Protection Membrane Self-Adhering Underlayment, polyethylene faced: ASTM D 1970, minimum of 30 mils thich, slip-resistant, polyethylene-film surface laminated to SBS-modified asphalt adhesive, with release paper backing; cold-applied.

1. Available Products:

a. Grace, W. R. & Co.; Grace Ice and Water Shield.

b. Owens Corning: WeatherLock G

REPAIRS

073126-7

c. Approved equal.

2.4 ACCESSORIES

A. Slate hooks for slate repair work: For slates with a 3” headlap and measuring up to ¾” thick, 3” long, 10-gauge, solid copper, Type 304 stainless steel, or Type 304 stainless steel powder coated black or bronze with 3/8” hook or 3/4” hook.

B. Nail head covers (bibs) for slate repair work: 16 oz. or 20 oz. copper, Grade HOO (cold rolled), complying with ASTM B370, or lead coated copper complying with ASTM B101, Type 1, Class A. Bibs shall measure 3” to 4” wide by 8” long. Snip bibs along their long sides to form barbs and/or bend to a slightly concave or S-shape prior to insertion to help prevent the bibs from sliding out.

C. Cants for starter course of slate shingles: Wood cants, standard 3/16”-1/4” thick plaster lath, tapered horse feather shims, or ripped rot-resistant lumber. Fabricate to height and width required to permit first and subsequent courses of slate to lie flat atop underlying courses.

D. Wire used for hanging slates to avoid nailing thru underlying flashings: 99.99% pure copper wire conforming to ASTM B3, 0.051” diameter, minimum.

E. Sealant adhesive for use as adhesive dabs below hip and ridge slates: Exterior, non-sag, gun grade, single-component, sealant adhesive complying with ASTM C 920, Type S, Grade NS, Class 12.5, use group NT, I, M, and O, or COR approved alternate sealant adhesive. Color shall be manufacturer’s standard color matching that of the slate as closely as possible.

F. Snow Guards: Copper Wire Loop type snow guards.

2.5 METAL FLASHING AND TRIM

A. Sheet Metal Flashing and Trim: Comply with requirements in Scope of Work for additional flashing related to gutters and downspouts.

B. Fabricate sheet metal flashing and trim to comply with recommendations in Copper Development Association’s standard details and that apply to design, dimensions, metal, and other characteristics of item. Standard flashing material shall be minimum 16 gauge copper.

1. Apron Flashings: Minimum 16 gauge solid copper. Fabricate with lower flange extending a minimum of 4 inches (100 mm) over and 4 inches (100 mm) beyond each side of downslope slate shingles and 6 inches (150 mm) up the vertical surface.

2. Step Flashings: Minimum 16 gauge solid copper. Fabricate with a 3-inch (75-mm) headlap extending a minimum of 4 inches (100 mm) over the underlying slate shingles and up the vertical surface.

3. Ridge Flashings: Minimum 16 gauge solid copper for vented and solid ridge flashings.

REPAIRS

073126-8

2.6 SLATER’S TOOLS

A. The following traditional slating tools shall be used for installation of the slate shingles:

1. Slate hammer for punching and nailing slate shingles/

2. Ripper for removing slate shingles.

3. Slate cutter or a slater’s stake and slate hammer for trimming and cutting slate shingles.

4. Steel punch or drill with masonry bit for forming holes in delicate or small pieces of slate.

B. Slates trimmed or cut on site shall have a bevel-edge similar to that produced at the quarry.

Note that a grinder or saw shall not be used for cutting/trimming field slates as they will not produce a beveled edge similar to that produced at the quarry.

C. The use of nail guns for installing slate shingles shall not be permitted.

PART 3 - EXECUTION

3.1 GENERAL

A. Examine the roof deck and verify that it is satisfactory condition and ready to receive the new roof underlayment and slate shingle system.

1. Verify that the roof deck is well secured to the roof framing, free of warping or cupping, free of projecting fasteners, and the edges between boards are flush.

2. Verify that the roof deck is clean, dry, and free of dew, frost, or other contaminants that might interfere with the laying or long-term durability of the slate roof system.

3. Report deficiencies in the roof deck to the COR prior to commencing work.

4. Project includes sistering of one rafter and replacement of 100 SF of roof deck in the building (base), and replacement of 120 SF of roof deck in the garage (bid option).

B. Slating shall begin at the roof eave and progress toward the ridge/top of the roof slope.

C. Sorting: Sort slate shingles for thickness prior to installation on the roof. Sort shingles by hand into three thicknesses as follows:

1. Thin: For use in slate courses closest to the ridge.

2. Thicker: For use in slate courses in “middle” courses.

REPAIRS

073126-9

3. Thickest: For use in the slate courses closest to the eave.

4. The goal is to create a roof of smooth, uniform appearance. Slate of different thicknesses shall not be used adjacent to each other.

5. To the extent possible, transitions between the different thicknesses of slate should occur at hips, ridges, vertical walls, and other non-conspicuous locations, rather than in the field of the roof, to preclude obvious discontinuities in thickness.

D. Blending: To help account for the natural variation in the coloration of the slate shingles, blend slates from several different pallets as it is brought to the roof surface to help provide for a more uniform overall appearance.

1. Blending may occur prior to, or in association with sorting.

E. Culling: No broken or cracked slate shall be used. Sound each slate for defects by tapping with a slate hammer or other metal object as it is being installed. Reject and dispose of all slates that do not emit a sharp, clear ring when tapped, or set aside for potential review by Supplier.

1. Cull and discard, or set aside for potential review by Supplier, warped and cupped slate shingles, those that are out of square, those with knots, knurls, or cramps on their unexposed faces, and slates with visible inclusions of iron pyrite.

2. Cull and discard, or set aside for potential review by Supplier, slates that are unusually thin or thick (i.e., slates that will be subject to breakage, cause excessive shadow lines, or cause the butt ends of overlying slates to stick up) as well as those with curvature or twist greater than 1/8” in 12” across the width of the slate.

F. Nail holes made on site in slates shall be punched or drilled from the back of the slate to produce a small recess, or countersink, on the exposed face of the slate to accept the nail head.

1. Drill nail holes in slates where a nail used to secure a clip, cleat, or lock strip associated with a flashing must pass through an underlying slate. Similarly, drill nail holes in slates that taper to a point or have a small nailing area, such as hip slates.

G. Slates cut on site shall be cut from the back of the slate to maintain a beveled edge on the exposed face.

H. Slate Order: As work progresses, check that the quantity of slate remaining on site is sufficient to complete the Project. Order additional quantities of slate in a timely manner, as required, so as not to delay final completion of the project and to allow proper blending of the slate.

3.2 REMOVAL OF EXISTING SLATE SHINGLES

A. Slate Roof Replacement - Disposal

REPAIRS

073126-10

1. Remove all slate shingles and associated underlayments down to the roof deck.

a. Pull/remove (do not drive-in) all slating nails and fasteners associated with existing underlayments.

b. Deck irregularities: Identify broken, warped, cracked, rotted, or otherwise deteriorated or irregular roof decking and framing that would make the substrate unsuitable as a substrate for new underlayments and new slate roofing, and report to the Design Professional.

c. During the course of the Work, protect from damage all roofing, flashings, rainwater conduction systems, and other building and site elements scheduled to remain.