B08_Attachment_1_-_Statement_of_Work.pdf

United States Department of the Interior

National Park Service Minute Man National Historical Park

174 Liberty Street Concord, MA 01742

STATEMENT OF WORK

Roof Replacement

Buttrick Cottage House & Buttrick Carriage House 174 Liberty St Concord, MA 01742

DATE: April 16, 2025

Table of Contents

Section 1.0 General Section 2.0 Requirements Section 3.0 Scope of Work Section 4.0 Submittals Section 5.0 Specifications Section 6.0 Installations Section 7.0 Government-Furnished Property Section 8.0 Security Section 9.0 Period of Performance Section 10.0 Contractor’s Use of Premises Section 11.0 Restrictions Section 12.0 Definitions

SECTION 1.0 GENERAL

1.1 Purpose of Contract: Due to the condition and age of the existing roof of both the Buttrick Cottage House and Buttrick Carriage House, Minute Man National Historical Park is choosing to have these roofs replaced. The essential use of the structures as offices, archival storage, and maintenance shop space are critical for the day-to-day operations of the Park and it’s staff. The roof replacements will pay homage to the existing architectural design details while extending the buildings service life. Outlined here in the Statement Of Work and in conjunction with the attached contracting documents, both roof replacements will be replaced in-kind with the addition of 2 new copper cap over sleeves.

1.2 Applicable laws: All work of this contract shall be performed in accordance with applicable laws, ordinances, rules, regulations and standards:

1.2.1 The Selected Contractor shall be responsible for their own transportation to the Park.

Contractor shall follow all local, state and federal laws when operating motor vehicles and ensure vehicles are inspected and registered to operate on public roads.

1.2.2 The Selected Contractor shall adhere to OSHA 20 CFR 1910 other Federal, State and local laws and regulations to fully comply with this requirement.

1.2.3 Any and all applicable personal protective equipment shall be provided by the contractor to contract employees consistent with Federal, State and local laws.

1.2.4 The Selected Contractor is responsible for offsite disposal of all waste generated by this project in accordance with federal, state, and local regulations. For clarification of any requirements made by the U.S. Office of Public Health, please consult the Contracting Officer’s Representative (COR).

1.3 Description of Site: Minute Man National Historical Park comprising of over 1100 acers, 44 historic buildings and structures and stretches though the towns of Concord, Lincoln and Lexington Massachusetts. Located inside the bounds of the Park is the Stedman Buttrick Jr. Estate. Positioned in the Estate sit The Buttrick Cottage House and the adjacent Buttrick Carriage House, both built in the year 1911 and share the same architectural building design characteristics. Both buildings are occupied daily as offices and used for storage of historical documents as well as general park maintenance equipment.

1.4 Payment: Payment shall be submitted as follows:

1.4.1 Payment to the selected Contractor shall be provided upon satisfactory completion of the terms of this contract in a single, lump sum payment.

SECTION 2.0 REQUIREMENTS

2.1 Provision of Labor & Supplies: The contractor shall provide all labor and supplies necessary to complete this contract.

2.2 Insurance: Selected contractor shall be fully insured for damages during the contract period of performance.

2.3 Quality Control: The Selected Contractor shall complete the scope of work outlined below in Section 3.0. The Selected Contractor will verify and guaranty a sound and leak free roof installation.

2.4. Warranty:

• Materials: All used materials to be used are to hold manufactures warranties that will be presented to the COR as outlined in Section 4.1.4.

• Installation: The Selected Contractor is to adhere to a 24-month warranty on all work performed inside this contract. This warranty period will begin upon completion and final payment for the work outlined in this contract.

2.4 Communication: Contractor’s central office or representative shall be available by phone and email weekdays, Monday through Friday 8:00 am to 4:30 pm. The Park will sponsor a COR to be the Point Of Contact for all site management needs.

SECTION 3.0 SCOPE OF WORK

3.1 In general: The Contractor shall supply all labor, materials, equipment, temporary protection, tools, and appliances necessary for the proper completion of the work in this Section, as required in the Specifications and Installations, in accordance with good work practice. The Contractor is to remove with care the existing roofing materials including gutters sheet metal flashing.

Reinstall in-kind a weather tight new roof using new materials with best practices. The work under this Section generally includes the following:

3.1.1 Documentation: The Selected Contractor is to photo document, conduct diligence research of the existing roof, as well as gather samples for the purpose of future submittals for replacements.

3.1.2 Strip Roofing: The Selected Contractor is restricted from removing more roofing off a roof than can be replaced inside the same day. Deviation from this item must be coordinated in advance with the COR.

3.1.3 Carpentry Repairs: Based on the condition of stripped roof and removed gutters, make repairs need for sound and secure substrate. Care must be taken to replicate species type and dimensions when patching in roof decking. Coordinate with COR as needed

3.1.4 Underlayments: As specified in Section 5, install as typical and in accordance with Section

6. and with reference to the contracting documents.

3.1.5 Sheet Metal Flashing and Trim: Where posable reuse existing lead and copper flashing.

Replace as needed in-kind the materials and practices to restorative effect. As specified in Section 5, install as typical and in accordance with Section 6. and with reference to the contracting documents.

3.1.6 Roofing Shingles: Install 3 tap asphalt shingles to replace in-kind the existing roofing profiles. As specified in Section 5, install as typical and in accordance with Section 6.

3.1.7 Gutters: Install new metal and wooden gutters to replace in-kind the existing roofing profiles as specified in Section 5, install as typical and in accordance with Section 6.

SECTION 4.0 SUBMITALS

4.1 Submittals: The following information shall be submitted by the Contractor to the CO and COR following the award of the contract. The CO and COR shall review these submittals for conformance to the contract requirements and respond within 7 working days whether the submittal is either accepted or rejected. Any changes to the submittals at any point in the contract shall require a new submittal to the Government for review. Transmittal Form (CM-16) from Denver Service Center Workflows will be used for all submittals inside this contract.

4.2 Material Samples to be Submitted:

• Gutters: 1’-0” section of gutter liner (as applicable) for each gutter profile, one outlet tube.

• Downspouts: 2’-0” length.

• Anchoring Devices: Submit one of each type required.

• Roofing underlayment: 1’ section of product.

• Asphalt shingles: 3’ section of material.

4.2.1 Manufacturer’s data: Sheets on each product to be used including ASTM standards and testing data.

https://www.nps.gov/dscw/

4.1.1 Shop Drawings:

• For all gutters and downspouts.

• For all manufactured metal drip edges, flashings, valleys, and copper cap over sleeve.

4.1.2 Stucco finish coat samples:

• 2” sample pucks with mixtures

4.1.3 Copy of manufacturer’s lifetime limited warranty

4.1.4 Documentation of contractor lead names and phone numbers for staff associated with this contract.

SECTION 5.0 SPECIFICATIONS

5.1: SUMURY: In general, the Contractor shall supply all labor, materials, equipment, temporary protection, tools, and appliances necessary for the proper completion of the work in this section, as required in the specifications and in accordance with good construction practice.

The work under this section generally includes the installation of all roofing related underlayments:

• Historic Removal and Dismantling

• Rough Carpentry

• Asphalt Shingle Roofing

• Sheet Metal Flashing & Trim

• Gutters and Downspouts

5.2: QUALITY ASSURANCE:

5.2.1 Workmanship: Use skilled and experienced personnel, carefully supervised, in such a manner as to achieve sound, weather-tight installation. All workmen shall have sufficient experience to qualify them as experienced roofers.

5.2.2 Manufacturer Qualifications: Company specializing in manufacturing products specified in this section with a minimum ten years documented experience.

5.2.3 Installer Qualifications: Company specializing in performing Work of this section with minimum two years documented experience with projects of similar scope and complexity and using this material.

5.2.4 Project adjacent areas from the work of this section; cover and protect existing historic work located below and adjacent to repair areas.

5.3: STANDARDS:

5.3.1 ASTM International (ASTM):

• ASTM D226 - Standard Specification for Asphalt-Saturated Organic Felt Used in

• Roofing and Waterproofing.

• ASTM D1970 - Standard Specification for Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing.

• ASTM D4869 - Standard Specification for Asphalt-Saturated Organic Felt

• Underlayment Used in Steep Slope Roofing.

• ASTMD6757 – High Performance Shingle Underlayment

• ASTM E96 - Standard Test Method for Water Vapor Transmission of Materials.

• ASTM E108 - Standard Test Methods for Fire Tests of Roof Coverings.

5.3.2 International Code Council (ICC):

• 2.ICC AC 48 - Acceptance Criteria for Roof Underlayment For Use In Severe Weather Climates.

• ICC-ES AC188 – Roof Underlayments.

5.3.3 CSA Group (CSA): CSA A 123.3 – Asphalt Saturated Organic Roofing Felt.

5.3.4 Underwriters Laboratories Inc. R13399 - Class A fire classification under fiberglass shingles and Class C under organic felt shingles (per ASTM E108/UL 790).

5.3.5 Underwriters Laboratories Inc. Classified Sheathing Material Fire Resistance Classification with Roof Designs: P225, P227, P230, P237, P259, P508, P510, P512, P514, P701, P711, P717, P722, P723, P732, P734, P736, P742, P803, P814, P818, P82.

5.3.6 Miami-Dade County Code Report NOA #15-0728.11.

5.4 DELIVERY, STORAGE, AND HANDLING:

5.4.1 Store and handle in strict compliance with manufacturer's written instructions and recommendations.

5.4.2 Protect from damage due to weather, excessive temperature, and construction operations.

As recommended by manufacturer, store materials as lower temperature between 40 and 100 degrees F (4.4 and 37.8 degrees C).

5.4.3 Packing, Shipping, Handling and Unloading: Deliver materials in manufacturer’s original unopened, undamaged containers with identification labels intact.

5.9.1 Storage of Materials: Deliver all materials to the job site as needed in original, unopened containers bearing the manufacturer’s name, stock number, date of manufacture, contents by volume, and application instructions.

5.9.2 Store all materials in accordance with manufacturer’s recommendations. Dispose of solvent-based materials in accordance with requirements of local authorities having jurisdiction.

5.9.3 Do not install underlayment or shingles on wet surfaces. For rooftop loading lay shingle bundles flat. Do not bend over ridges. Do not stack and store materials on roof surfaces except as required for immediate installation.

5.5 MATERIALS:

5.1.1 Waterproof Membrane: Flexible, self-adhering, cold applied, rubberized asphalt membrane with polyethylene film reinforced top surface laminated in conformance with ASTM D 1970, minimum of 40 mils thick. Formulated for high temperature application. To be used on roof decks, eaves, ridges, valleys, penetrations, and at roof/wall intersections.

• Basis-of-Design: Ice and Water Shield HT by W.R. Grace Construction Products Division, Owens

Corning.

5.1.2 Breathable Underlayment: Premium, breathable, non-asphaltic, polypropylene construction, manufactured for use on roof decks to provide a water-resistant layer beneath asphalt and wood roofing shingles.

• Basis-of-Design: “DeckArmor” by GAF, Parsippany, NJ.by CertainTeed

5.1.3 Self-Adhered Waterproof Membrane for Use Under Copper and Lead-Coated Copper:

Self adhering, butyl underlayment designed for extreme temperature roof assemblies, 30 mils thickness with cross-laminated polyethylene film.

• Basis-of-Design: Ice and Water Shield HT by W.R. Grace Construction Products Division, Owens

Corning.

5.1.4 Sheet Metal, Flashing, and Trim: The intent of this project is to duplicate the historic roof and existing gutter installation in all characteristics (configuration, dimensions, lay-out, materials). If the historic design conflicts with currently accepted practice, Contractor shall notify Contracting Officer for guidance before proceeding with the work.

• All new sheet metal roofing and flashing shall replicate the character and details of the existing roofing and flashing as indicated in this Statement of Work and the supplemented contracting documents.

• Flashing associated with the installation of new roofing and repairs to existing roofing including valley, hip, ridge, eave flashing, drip edges, as currently installed. Step, base, and counter flashing at the intersection of roof slopes with sidewalls at chimneys, walls, etc.

5.1.4.1 Copper Sheet for Flashing: Shall match existing materials.

• Cold rolled sheet copper conforming to ASTM B370 Type I Class A; temper H00 (cold rolled) except where 060 as required for forming.

• Weight: 16 oz, 20 oz.

• Sheet metal flashings shall be shop-fabricated. All breaks, bends and hems shall be uniform, clean, straight lines.

• Flanges shall be 4’’ wide unless otherwise noted.

• Drip edges shall be hemmed ¾’’ wide and break at a 30-degree angle

• Clips shall be 2’’ wide

• Downspouts/Elbows/Extensions: 20 oz. copper

• Fasteners: Same metal as sheet metal flashing or other noncorrosive metal as recommended by sheet metal manufacturer. Match finish of exposed heads with material being fastened.

• Use hard copper or brass fasteners for copper.

5.1.4.2 Lead Coated Copper for Flashing: Shall match existing materials.

• Cold rolled sheet copper conforming to ASTM B101, Type I, Class A

• Weight: 16 oz.

• Lead shall be applied by hot dip process at 6 to 7.5 lbs. per 100 s.f.

5.1.4.3 Tin-Zinc Alloy-Coated Copper for Flashing:

• Basis of Design: “Freedom Gray” sheet metal, as manufactured by Revere Copper Products.

• Alloy factory-applied to both sides.

• Naturally weathering gray color; satin finish.

• Natural patina and variation of shades and hues.

• Installed with surface protection between tin/zinc coating and wood.

5.1.4.4 Sheet Lead:

• Milled lead sheet or roll, 4 lbs./ sq. ft., (1/16 inch thickness), soft temper, minimum 4% to maximum 6% antimony, remainder not less than 99.90% pure lead. Furnish material free

5.1.5 Fasteners:

• Same metal as sheet metal flashing or other noncorrosive metal as recommended by sheet metal manufacturer. Match finish of exposed heads with material being fastened.

• Hand driven roofing nails, hot dipped galvanized, 11-gauge or 12-gauge, 3/4-inch minimum ring shanks with 3/8-inch to 7/16-inch diameter heads.

• Pneumatic nails, 1-1/4-inch wire collated 0.120 ring shank electro-galvanized plated.

5.1.6 Gutters: In general, the Contractor shall supply all labor, materials, equipment, temporary protection, tools, and appliances necessary for the proper completion of the work in this Section, as required in the Specifications, in accordance with good work practice. The work under this section generally includes the following:

• Remove and replace all gutters in-kind, match existing profile.

• Remove and replace all downspouts.

• Inspect and clean all existing downspout in-ground drain boots to remain.

• Provide miscellaneous accessories such as strainers, blocks, hangers, hooks, cleats, clips, brackets, and the like for proper installation.

• Final testing of system to ensure free flow to discharge.

5.1.6.1 Wood Gutters: Provide Douglas fir or similar species wood gutters, matching existing dimensions (typically 4”x5” or 4”x6”) and interior and exterior “Boston” profile. Between end caps and outlet pipes, provide lead flashing sloped toward outlet at low end. Chisel and/or carve out depression in gutter surrounding outlet pipe. New wood gutters to be primed with two coats of oil-based primer before installation. Manufacturers:

• Liberty Cedar.

• L. Sweet Lumber Co.

• Coastal Forest Products.

5.1.6.2 Metal Gutters:

Hung metal gutters: 16 ounce cold-rolled red copper conforming to ASTM B370 Type I Class A 16, 20, 24 or 36 oz. as required, to match existing size, profile and configuration.

Gutter Straps: re-use salvaged gutter straps wherever possible; Replacements to match existing material, size and style as necessary.

Solder: ASTM B-32 Grade SN60, 50/50 tin/lead solder

• Flux: ASTM B32 Type IS.

• Elastic Cement: FS SS-C-153C, Type I or II.

• Cleats: 16 oz. cold rolled sheet copper, 2” wide by 3” long.

• Rivets: 3/16” diameter copper rivets.

Nails: stronghold copper type, flat head, barbed, No. 12 Stubs gauge, length as required.

Downspout Support Hangers: Hinged copper masonry hanger with copper wire tie. Two straps per downspout minimum- match existing in like, kind and number.

Other Metal Accessories: provide sheet metal fasteners, clips, straps, anchoring devices and similar accessory units as required for installation of work, matching or compatible with material being installed, non-corrosive, of size and gauge required for performance.

Gutter Guard: Provide concealed micro-mesh or screen in all gutters Strainer Domes: Provide new strainer dome at each downspout outlet.

5.1.6 Stucco Mortar:

5.1.4.1 Samples and Mockups: Before full-scale operation, prepare mockups of mortar joint repointing and cleaning to demonstrate aesthetic effects and set quality standards for materials and execution. Specific locations of mock-ups to be directed by Contracting Officer. Prepare mockups to Contracting Officer satisfaction before proceeding with the Work.

• Submit sample to the Contracting Officer in coordination with the COR.

• All generated samples are to be in likeness to the original motor mixture and finish.

• Allow samples to cure/dry at least three days before requesting review. Samples shall be viewed from an approved distance.

• Mockups must match adjacent materials and may require different mortar formulations based on material and location to be repointed.

5.1.6.2 Mortar Components:

• Portland Cement: ASTM C-150, Type I and II (as indicated), non-staining white or gray, depending on which gives the best color match.

• Lime: ASTM C-207, Type S, mason's hydrated lime.

• Sands: ASTM C-144, masonry sand, matching samples previously approved by the Contracting Officer and COR

• Dry Inorganic Pigment:

• Natural or synthetic iron oxide pigment delivered in powder form.

• Lime-proof (alkali-resistant).

• Fade-resistant.

• Minimum ten-year shelf life.

• Acceptable Manufacturers:

o Basis of Design: Empire Blended Products, Lanxess Pigments, Bayferrox Inorgaic Pigments; Bayferrox Color Pigments (lanxess.com) o Direct Colors.

o Landers-Segal Color Co. Inc. (LANSCO Colors), a division of DCL Corporation.

o Mason Color.

• Admixtures: not permitted.

• Water: clean and potable, free of oils, acids, alkalis, and organic matter.

5.1.6.3 Type: Each class or mixture of mortar shall have a twenty-eight (28) day compressive strength less than or equal to the compressive strength of the original existing mortar in the structure, as determined by ASTM C 109/C 109M for mortar.

SECTION 6 INSTALLATIONS

6.1 JOB CONDITIONS:

6.1.1 Weather Limitations: Proceed with roofing work only when existing and forecasted weather conditions permit roofing to be installed per manufacturer’s recommendations and warranty.

6.1.2 Take all necessary precautions to protect workers, NPS employees, and general public from roofing operations.

6.1.3 Provide necessary barricades and signs, and overhead protection at entrances and exits.

Maintain egress routes during operations.

6.1.4 Protect significant landscape materials, walks, and building surfaces from debris and damage during removal and installation work.

6.1.5 Take regular appropriate safety precautions conforming to manufacturer's recommendations and applicable regulatory requirements

6.2 UNDERLAYMENT INSTALLATION:

6.2.1 Roofing Underlayment: Install roofing underlayment on sloped surfaces at locations indicate on the Drawings, but not less than at hips, ridges, eaves, valleys, sidewalls and chimneys, and surfaces over interior space within 36 inches (914 mm) from the inside face of the exterior wall.

• Strictly comply with manufacturer’s installation instructions including but not limited to the following:

• Schedule installation such that underlayment is covered by roofing within the published exposure limit of the underlayment.

• Do not install underlayment on wet or frozen substrates.

• Install when surface temperature of substrate is a minimum of 40 degrees F (5 degrees C) and rising.

• Remove dust, dirt, loose materials and protrusions from deck surface.

• Install membrane on clean, dry, continuous structural deck. Fill voids and damaged or unsupported areas prior to installation.

• Prime concrete and masonry surfaces using specified primer at a rate of 500-600 square feet per gallon (12-15 sqm/L). Priming is not required for other suitable clean and dry surfaces.

• Install membrane such that all laps shed water. Work from the low point to the high point of the roof at all times. Apply the membrane in valleys before the membrane is applied to the eaves. Following placement along the eaves, continue application of the membrane up the roof. Membrane may be installed either vertically or horizontally after the first horizontal course.

• Side laps minimum 3-1/2 inches (89 mm) and end laps minimum 6 inches (152 mm) following lap lines marked on underlayment. Patch penetrations and damage using manufacturer’s recommended methods.

6.2.2 Waterproof Membrane Underlayments:

• At areas of roof to receive new asphalt shingles apply waterproof membrane to entire roof area as noted on Drawings.

• At asphalt shingle roof areas to be repaired install self-adhering ice and water barrier from the eaves edge of roof up the slope a full 36 inches (914 mm) but not less than 24 inches (610 mm) beyond the interior edge of the exterior wall. Lap ends 6 inches (152 mm) on roof decks sloped 5:12 and greater. On roofs with slopes from 2:12 up to 4:12, see application instructions printed on each package.

6.2.3 Valleys, Ridges, Penetrations:

• Install self-adhering ice and water barrier at least 36 in (914 mm) wide and centered on the valley/ridge. Lap ends 6 in (152 mm) and seal.

• Vent pipes: Install a 24 inches (610 mm) square piece of self-adhering ice and water barrier lapping over roof deck underlayment; seal tightly to pipe.

6.2.4 Drip Edge: Shall be installed on all roof edges.

• Install drip edge on eaves first with underlayment installed over the drip edge, or install per local code requirements

• Install drip edge on rakes after underlayment is installed, with the drip edge fastened over the underlayment

• Joints in drip edge shall be lapped minimum 2 inches (51 mm) with the upslope piece lapped over the down slope piece, or per local building code requirements.

6.2.5 Roofing Felt: Center a 36-inch width in each valley and tack in place. Then beginning at edge of roof, lay felt parallel to eaves and lap each course 2 inches over underlying course. Lap ends 4 inches and stagger end laps 6 feet, minimum. Lap felts 6 inches onto valley and lap the felt 6 inches from both sides over all hips and ridges. Where roof meets a vertical surface, carry underlayment 4 inches up the surface. Tack felts in place.

6.3 SHEET METAL FLASHING AND TRIM INSTALLATION:

6.3.1 General: Sheet metal flashing and components shall be installed as indicated on drawings and approved shop drawings, in a water-tight manner without waves, warps, buckles, fastening stresses, or distortion.

6.3.2 Reference Standards: Conform to the requirements of Copper Development Association, Inc., and SMACNA's "Architectural Sheet Metal Manual".

• Fabricate and install metal flashing work in accordance with details and specifications of Reference Standards, manufacturer's instructions, and as herein specified, to provide a weather tight installation.

• Initially lay-out and verify all lines and panel terminations on the substrate.

• Allow for expansion and contraction. Angle bottom edges of exposed vertical surfaces to form drips and hem exposed edges as indicated on drawings.

6.3.3 Roof Counter Flashing: Overlap base flashing 4 inches minimum. Install bottom edge tight against base flashing. Lap seam vertical joints 3 inches minimum. Apply sealant. Miter, lap seam, and close corner joints with solder or rivet and sealant.

6.3.4 Base Flashing: Extend up vertical surface 8 inches minimum and onto roofing 8 inches minimum. Secure bottom edge of flashing by cleating to substrate. Solder lap vertical seams. Miter and solder lapped corners.

6.3.5 Roof Penetration Flashing: For base flashing, extend flange onto roof 6 inches minimum away from penetration. Extend flange upward around penetration to at least 8 inches above roofing surface.

Fold back upper and side roof flange edges 1/2 inch. Solder lap joints. For counter flashing, overlap base flashing 1 inch minimum with storm collar sloped away from penetration. Secure to penetration with draw band and sealant, rivet and sealant, solder.

6.3.6 Over Sleeve Caps: Wrap vertical ventilation in additional waterproof underlayment overlapping the previous later that covers the premanufactured boot by a minimum of 4 inches on both the up and down slope. Wrap rosin paper around the ventilation pipe before placing the pre-made copper cap over sleeves. Overlap waterproof underlayment on all side to layer below with 4-inch minimum overlap. Shingles to be trimmed to fit around vent stacks. Verify from provided construction documents.

6.4 SHINGLE INSTALLATION:

6.4.1 Install shingles (including starter shingles, as well as hip and ridge shingles) in accordance with manufacturer’s installation instructions and in accordance with local building code requirements.

6.4.2 Snap horizontal and vertical chalk guidelines on underlayment, lay shingles following manufacturer's instructions. Match existing coursing, and hip and ridge details.

6.4.3 Install starter course at lowest roof edge and along rake with edge of shingles extending 1/4 inches (6.4 mm) over edge of roof. Sealant strip should be closest to roof edge.

6.4.4 Install first and successive courses of shingles stepping diagonally up and across roof deck with recommended offset at each succeeding course. Maintain uniform exposure of shingles at each succeeding course. Use of a chalk line every other course is recommended.

6.4.5 All fasteners must be driven flush with the shingle surface and penetrate at least 3/4 inches (19.1 mm) into the wood deck. Where the deck is less than 3/4 inches (19.1

mm) thick, the fastener should be long enough to penetrate fully and extend through the roof sheathing.

6.5 STUCCO REPAIR:

6.1 General: Based on existing application methods and finishes:

• Wash existing current condition of chimneys to determine and evaluate extent of stucco failure.

• All loose and failed chimney stucco parging to be removed. Samples to be used as basses in creating new mixture.

• New stucco parging to be applied in industry accepted 3 coat application, as typical. Other means or methods that provide a similar result to be submitted to the Contracting Officer and in coordination with the COR before any work to begin.

• New mortars shall be compatible with the existing masonry units. They shall match the historic mortar as closely as possible, so that the new material can coexist with the old in a sympathetic, supportive and, if necessary, sacrificial capacity. New mortars shall conform to the following criteria:

• New mortars shall match their historic counterparts in color, texture and tooling.

• New sand(s) and aggregate(s) shall match the sand(s) and aggregate(s) in the historic mortar.

6.5.2 Tools: Hand tools shall be exclusively used for removal of mortar unless the use of power tools can be demonstrated to the Contracting Officer to have no damaging effect on the surfaces of the clay masonry units. Power tool use for this work shall be subject to approval by the Contracting Officer.

6.7 GUTTERS:

6.7.1 Wood Gutters:

• Measure and document existing gutter conditions to facilitate in-kind replacement.

• All gutter joints at corners and in runs must be reinforced as well as watertight. Joints shall match existing building techniques which may consist of a lead strip mortised into the gutter trough, set in asphalt mastic and nailed with copper tacks. In lieu of lead strips, provide continuous sealant at seams.

6.7.2 Metal Gutters:

• Prior to commencing fabrication document and record all existing gutter and downspout details, dimensions and fabrications. Submit shop drawings for Contracting Officer approval.

• Install gutters so that they are watertight, free from visible waves, buckles, dents, and other defects of material and workmanship which would affect its strength, durability or appearance.

• Cutting and fitting of work shall be neatly and carefully performed as required for the work of other trades, and so as to leave such work complete and watertight.

• Cleats shall be installed with one end locked into seam and the other end nailed with two nails and folded back.

• Formed metal shall accurately reproduce the detail and design as shown. Profiles, bends and intersections shall be sharp, true, and even. Joints shall be locked and soldered.

• Separations: provide for separation of metal from non-compatible metal or corrosive substrates by coating concealed surfaces at locations of contact with bituminous coating as specified.

• Check installed gutters for proper drainage. Water must run to downspouts. No ponding in gutter is allowed.

• Wire brush surfaces to be soldered. Use well heated coppers (no open flame) to heat sheet and sweat completely through full width of seam. Seam shall show a minimum of 1 inch of evenly flowed solder. Solder in flat position when possible. Seams on slopes steeper than 45 degrees, solder a second time.

• Fire extinguisher must be on hand at all times during hot work.

5.7 PERFORMANCE

5.7.1 General: Install a watertight, asphalt roofing system with compatible components that will not permit the passage of liquid water and will withstand wind loads, thermally induced movement, and exposure to weather without failure.

5.7.2 FM Listing: Provide asphalt roofing, base flashings, and component materials that comply with requirements of FM 4450 and FM 4470 as part of a roofing system and that are listed in FM's "Approval Guide" for Class 1 or noncombustible construction, as applicable. Identify materials with FM markings.

• Roofing system shall comply with the following:

• Fire/Windstorm Classification: Class 1A-9

5.7.3 Underwriters Laboratories (UL):

• UL 790 - Standard Test Methods for Fire Test of Roof Coverings.

• UL 997 – Wind Resistance of Prepared Roof Covering Materials.

• UL 2218 - Impact Resistance of Prepared Roof Covering Materials.

• UL 2390 - Test Method for Wind Resistant Asphalt Shingles with Sealed Tabs.

• UL 1897 – Uplift Tests for Roof Covering Systems

SECTION 7.0 GOVERNMENT FURNISHED PROPERTY

7.1: There is no government furnished property or services inside this contract.

SECTION 8.0 SECURITY

8.1 Public Safety: Contractor shall take necessary measures to ensure public safety while performing their duties. This includes preventing any member of the public from entering the work site, leaving hazardous materials unsecured or operating motor vehicles on Park roads/trails. COR shall provide direction to the contractor if the need arises to clarify Park safety policies and protocols.

8.2 NPS Employee Access: Both buildings must remain open and accessible for Park employees during the length of this contract. Any coordination needed for this effort will be provided by the

COR.

8.3 Vehicle Parking: Contractor will be allowed to park vehicles in areas designated by Site Plans and in coordination with COR. Contractor shall not park in access ways that are designated for firefighting equipment or that would impede evacuation from a facility in the event of an emergency.

SECTION 9.0 PERIOD OF PERFORMANCE

9.1 The period of performance for the is 60 days.

SECTION 10.0 CONTRACTOR’S USE OF PREMISES

10.1 Hours: All work to be between the hours of 7:00am and 5:00pm. All rental services shall be coordinated within these hours.

10.2 Scheduling Access: The Selected Contractor shall be responsible for planning and scheduling its service with the COR.

10.3 Protecting Property: All work shall be completed in such a way as to create no damage and to protect the surrounding government property, and belongings etc. The contractor shall ask the COR for clarification if the need arises.

10.4 Utilities: Selected Contractor to provide and maintain portable facilities. Water and power are available at this location.

10.5 Use of Dumpsters: The Selected Contractor is responsible for disposal of all trash and recycling generated by the contract and shall dispose of all trash and recycling off site.

Reference 1.2.4.

10.6 Vehicle Parking & Storage: The Selected Contractor shall be granted use of the existing parking at the work site. Vehicles or trailers are not to be stored in the park overnight without permission and coordination for the COR.

SECTION 11.0 RESTRICTIONS

11.1 Smoking Policy: Ensure that the Selected Contractor’s employees adhere to Park’s ‘No Smoking Policy’. No smoking is allowed inside or within 50 feet of any park facility.

11.2 Use of Facilities: The selected contractor will not be granted use of Park office(s) restroom.

SECTION 12.0 DEFINITIONS

12.1 Federal Holidays are as follows: New Year’s Day, Martin Luther King Jr.’s Birthday, President’s Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veteran’s Day, Thanksgiving Day, and Christmas Day; the preceding Friday when one of the above holidays falls on a Saturday; the following Monday when one of the above holidays falls on a Sunday.

United States Department of the Interior