A04_Stirling_Roof_SOW.pdf

Scope / Statement of Work (SOW)

VAFO Stirling’s Barn Roof Replacements and Exterior Repairs

Valley Forge National Historical Park

Prepared By: James Moore

Date: May 18, 2021

Table of Contents

1.0 Project Description / Summary

2.0 Objectives

3.0 Background

4.0 Specific Work / Tasks

5.0 Government Furnished Equipment / Materials / Other

6.0 Special Conditions / Requirements

7.0 Place of Performance

8.0 Performance Period / Schedule Requirements

Task Order / Project Title

Park / Park Unit & Designation

1.0 PROJECT DESCRIPTION / SUMMARY:

i) This project will replace the roofs and complete other exterior repairs, including masonry and carpentry, on the Stirling’s Barn located within Valley Forge National

Historic Park (VAFO).

ii) The primary work of this project includes, but is not limited to, the following:

(1) Roofing

(a) General tasks will include removal of existing roofing material, preparation and repair of decking, skip-sheathing, and/or shingle lath; installation or repair of all required flashing; installation of new roofing material and associated components.

(2) Gutters and Downspouts

(a) General tasks will include: Removal of existing gutter systems and downspouts; ensuring all fasteners and brackets are properly secured;

cleaning and inspecting the components for damage; replacing missing or damaged components; reinstallation of the gutters and downspouts ensuring they are properly sloped and installed following manufacturers recommendations.

(3) Masonry Repairs

(a) General tasks will include: Cleaning the exterior of the building; removing all loose or deteriorated mortar, stucco, paint finish, and sealants; repairing areas of missing or deteriorated mortar, stucco, and sealants; applying approved paint finish.

(4) Exterior Carpentry Repairs and Painting

(a) General tasks will include: Repairing or replacing exterior wood components;

preparing the exterior wood components for approved paint finish; applying approved paint finish; repairing wood windows and their components

(including glass and the glazing compound); repairing exterior doors and their components; preparing and painting wood windows and doors with their approved paint finish.

(i) The paints, washes, and other finishes on the building may contain lead and/or asbestos. Any items found to contain hazardous materials, such as lead or asbestos, that are to be disturbed as part of this project shall be removed and replaced or encapsulated as part of the work. All work with items containing hazardous materials shall be performed by a qualified contractor and staff, and must follow all local, state, and federal laws, codes, and requirements pertaining to the hazardous material.

iii) The work for this project will be performed at the following location:

(1) Stirling’s Barn

(a) Address: Yellow Springs Rd, Tredyffrin Township, PA 19355

2.0 OBJECTIVES:

i) This project is intended to restore deteriorated exterior components and provide a weathertight exterior to the building. The existing components have reached the end of their useful life and are in need of replacement. Some components have deteriorated and will need replaced or restored to prevent further damage and to provide a suitable substrate for the new finishes.

3.0 BACKGROUND:

i) Stirling’s Barn is a 2 story bank constructed masonry barn with multiple additions.

Construction of the barn dates back to 1803. The exterior components of this building have exceeded their typical life expectancy and are in need of repairs or replacement.

4.0 SPECIFIC WORK / TASKS:

i) Roofing

(1) Materials:

(a) Shingles:

(i) Premium Grade, Certi-Sawn, Western Red Cedar 24” length x ½” at butt x

1/8” at head, 100% heart, 100% edge grain.

(b) Nails:

(i) Copper flat head 4d

(c) Shingle Breather:

(i) Nylon three-dimensional matrix in roll form meeting ASTM C 165-00, ASTM D 6818, ASTM E 84, Color: Black

(d) Self-Adhering Sheet Membrane Roof Underlayment:

(i) Cold applied, self-adhering, self-sealing sheet membrane, 40 mil minimum, ASTM D412, ASTM D461, ASTM D903, ASTM D1970.

(e) Roofer’s cement:

(i) FS SS-C-153 trowel consistency

(2) Submit samples of shingles and accessory items for approval as to quality and grade

(3) Except as otherwise noted, shown or specified herein, application procedures shall conform to the instructions of the Cedar Shake and Shingle Bureau. After demolition/removal of the existing wood shingle roof, review the roofing substrate with the COR prior to starting the new roof installation.

(4) After repairs are completed to the roof structure, deck and shingle lath, begin the installation of the wood shingle roof by installing waterproof membranes and other accessories as specified, shown or required.

(a) Lay self-adhering, self-sealing sheet membrane in valleys. Use minimum number of sheets to form valleys, lap joints shingle style.

(b) Install shingle breather matrix over all surfaces covered with self-adhering, self-sealing sheet membrane.

(c) Install metal flashing except for flashing intended to be laid up with the shingle installation.

(5) Layout the shingle coursing prior to starting to avoid a short course to the weather at the ridge. At eave, begin with a double starter course, bottom shingle to be 16”, top shingles to be 24”. Continue with each course, laying the shingles in uniform courses a minimum of 7 - 1/2 “to a maximum of 8”to the weather until the ridge is reached. Omit interleafed roofing felts between shingle courses. At every 8th course of shingles in the field of the roof install a 3” wide continuous strip of copper sheet metal with ½” exposed to the weather. Use the minimum number of copper nails to securely tack copper strips in place. At 3 courses below ridge install water and ice shield material continuous along the ridge so that it extends down the slope an equal distance on either side of the ridge, lapping over the 4th course of shingles below the ridge so that it will be fully concealed by the remaining courses of shingles when installed. Do not allow joints between adjacent shingles to align with joints between shingles of the course above or below, minimum offset 1-1/2”. Shingle width shall vary between 3-1/2” and 6”.

(6) Shingles shall be neatly laid with a 1/8” space between adjacent shingles with best face up. Use standard gauge to ensure uniform spacing between shingles.

Nails shall be driven up but not tight. Each shingle shall have 2 nails. No shingle shall exceed 6” in width; work out end of courses to allow for proper offset of joints with the course below. Coursing shall be kept straight and carefully fitted up to end walls and around openings, pipes or other obstructions. Cuts shall be neat and snuggly fitted. Where required, flashing shall be laid up in each shingle course with cap flashing stepped.

(7) At the ridge the last course of shingles on the west and north slopes of the roof shall extend 3” above the ridge. Trim lower courses to fit to the ridge alternating laps so that the last course shall have the shingle on the west slope lapping over the head of the shingle of the east slope. Install continuous copper ridge flashing under the next to the last course of shingles below the ridge. Ridge flashing shall extend ½” below the butt end of the covering shingles.

(8) The roofing subcontractor shall provide tarps as required to protect the building and its contents from damage by water intrusion during inclement weather. Do not open up more roof area than can be covered by the tarps available on site.

At the end of each day areas where demolition of the existing roofing has occurred shall be re-roofed or covered to prevent the intrusion of water. Tarps shall be tied down and secured to prevent displacement by the wind.

(9) Flashing and Sheet Metal:

(a) Provide all labor, equipment and materials required for the fabrication and installation of metal flashings and roof accessories as indicated, specified or required including all incidental items normally required for the installation and conditions encountered.

(b) Reference specification SMACNA

(c) No metal flashing or any portion thereof shall be covered with any material until the COR has inspected the installation. If any material is covered before such inspection it shall be uncovered, and if damaged replaced at the contractor’s sole expense. Provide 72-hour notice prior to the work for the

COR to schedule his inspection.

(d) The following types of failure will be adjudged defective work and shall be corrected immediately. Once corrective measures have begun, they shall continue to a satisfactory conclusion regardless of the guarantee period.

(i) Leaking, failure to stay in place.

(ii) Undue expansion; uplift; deformation; loosening; and splitting seams.

(e) Materials:

Materials shall conform to the following:

(i) Metalwork:

1. 16oz. terne coated copper

(ii) Solder:

1. 50% tin, 50% pig lead, ASTM B-152

(iii) Caulking:

1. Caulk: ASTM C-920 Type M or S, Grade NS Class 25, Exposure Use NT, Substrate Use O, Single or multi component silicone, gun consistency, non-sagging type. Color selected from the manufacturer’s standard colors. Up to two colors to be selected for the project.

2. Primer: Propriety chemical recommended by the sealant manufacturer required for adhesion of sealant to various substrate materials.

3. Cleaner: Proprietary cleaner recommended by the sealant manufacturer, free of oily residues or other substances capable of staining or harming joint substrates and adjacent materials.

(f) Workmanship:

(i) Pre-form flashing on metal breaks.

(ii) Provide concealed metal flashing set with shingle courses with stepped cap flashing at chimneys and parapet wall. Remove the existing cap flashing and stucco cover as part of demolition, clean out existing riglets or cut out mortar for new riglets in masonry of the chimney approximately 8” – 12” above the roof deck/lath. New stepped metal cap flashings shall be concealed at chimneys as detailed with stucco cover.

Extend metal a minimum of 6” under shingles and 6” under the new stepped cap flashing. Secure cap flashing in riglets and caulk. Conceal cap flashing with new stucco as shown allow stucco to cure for min. of 15 days and paint to match the existing whitewashed masonry.

(iii) At ridges layup new copper ridge flashing.

ii) Gutters and downspouts

(1) Remove and dispose of existing gutters, downspouts and associated components.

(2) Supply and install new gutters, downspouts and associated components in kind to the existing.

(a) All new components shall be submitted to the COR for approval prior to installation.

(b) Where existing components are missing, the contractor shall confirm the routing and orientation of these components with the COR prior to installation.

iii) Masonry

(1) General:

(a) Masonry work is limited to the repair of the stone substrate as required to render it fit to receive the required finish.

(2) Loose or un-bonded stones shall be reset in their original positions and orientations. Missing stones, if any, shall be replaced with sized, and shaped based on the best evidence available as to the missing stone’s size and shape.

(3) Failed or missing mortar joints shall be cut out using hand tools and repointed to match the profile, thickness and depth of the surrounding mortar joints.

(4) Sequencing and scheduling Masonry work:

(a) Work sequence: Perform stone repointing work in the following sequence:

(i) Remove finish material from the area to be repaired.

(ii) Inspect masonry for open mortar joints and permanently or temporarily point them before cleaning to prevent the intrusion of water and other cleaning materials into the wall.

(iii) Clean stone

(iv) Rake out mortar from joints surrounding repair areas and from adjacent joints requiring repointing.

(v) Repair stonework

(vi) Point mortar joints.

(5) Field Conditions:

(a) Weather Limitations: Proceed with installation only when existing and forecasted weather conditions permit repointing work to be performed according to product manufacturers' written instructions and specified requirements.

(i) Temperature Limits, General: Repoint mortar joints only when air temperature is between 40° and 90° F and is predicted to remain so for at least seven days after completion of the Work unless otherwise indicated.

(ii) Hot‐Weather Requirements: Protect mortar‐joint pointing when temperature and humidity conditions produce excessive evaporation of water from mortar materials. Provide artificial shade and wind breaks and use cooled materials as required to minimize evaporation. Do not apply mortar to substrates with surface temperatures of 90° F (32° C) and above.

(6) Materials:

(a) Contractor shall have a sample of the mortar analyzed prior to starting work to determine the composition of the mortar.

(i) Premixed mortars matching the composition determined in the analysis are acceptable, but a fully cured sample must be submitted to the COR for approval prior to application.

(ii) All materials for the mortar, premixed or field mixed, shall be submitted to the COR for approval.

(b) Source Limitations: Obtain each type of material for stone repointing

(cement, sand, etc.), as determined from the analysis, from single source with resources to provide materials of consistent quality in appearance and physical properties.

(c) Mortar Mixes:

(i) Measurement and Mixing: Measure cementitious materials and sand in a dry condition by volume or equivalent weight. Do not measure by shovel;

use known measure. Mix materials in a clean, mechanical batch mixer.

1. Mixing Pointing Mortar: The contractor shall follow the manufacturers recommendations for mixing the mortar materials.

(ii) Do not use admixtures in mortar unless otherwise indicated.

(d) Cleaning Materials:

(i) Natural or nylon bristle brushes

(ii) Job-mixed detergent solutions:

1. Solution prepared by mixing 2 cups of tetra sodium polyphosphate

(TSP), ½ cup of laundry detergent and 20 quarts of hot water for every 5 gallons of solution required.

(e) Protection:

(i) Prevent mortar from staining face of surrounding stone and other surfaces.

1. Cover ledges, and other projecting items to protect them from mortar droppings.

2. Keep wall area wet below pointing work to discourage mortar from adhering.

3. Immediately remove mortar splatters in contact with exposed stone and other surfaces.

(f) Stone repointing:

(i) Rake out and repoint joints to the following extent:

1. All open joints

2. Joints at locations of the following defects:

a. Holes and missing mortar

b. Cracks that can be penetrated ¼ inch or more by a knife blade

0.027 inch thick.

c. Cracks 1/16 inch or more in width and of any depth.

d. Deterioration to point that mortar can be easily removed by hand, without tools.

e. Joints filled with an incompatible mortar or substances other than mortar.

(ii) Do not rake out and repoint joints where not required.

(iii) Rake out joints as follows:

1. Remove mortar from joints by hand with a chisel and resilient mallet to depth of 2‐1/2 times joint width or as required for masonry repair, but not less than 1 inch (13 mm) or not less than that required to expose sound, un-weathered mortar.

2. Remove mortar from stone surfaces within raked‐out joints to provide reveals with square backs and to expose stone for contact with pointing mortar. Brush, vacuum, or flush joints to remove dirt and loose debris.

3. Do not spall edges of stone units or widen joints. Replace or patch damaged stone units as directed by the COR.

(iv) Notify COR of unforeseen detrimental conditions including voids in mortar joints, cracks, loose stone, rotted wood, rusted metal and other deteriorated items.

(g) Pointing with Mortar:

(i) Rinse joint surfaces with water to remove dust and mortar particles.

Time rinsing applications so, at time of pointing, joint surfaces are damp but free of standing water. If rinse water dries, dampen joint surfaces before pointing.

(ii) Apply pointing mortar first to areas where existing mortar was removed to depths greater than surrounding areas. Apply in layers not greater than 3/8 inch (9 mm) until a uniform depth is formed. Fully compact each layer, and allow it to become thumbprint hard before applying next layer.

(iii) After deep areas have been filled to same depth as remaining joints, point joints by placing mortar in layers not greater than 3/8 inch. Fully compact each layer and allow mortar to become thumbprint hard before applying next layer.

(iv) Hairline cracking within mortar or mortar separation at edge of a joint is unacceptable. Completely remove such mortar and repoint.

(v) Where repointing work preceded cleaning of existing stone, allow mortar to harden at least 30 days before beginning cleaning work.

iv) Carpentry repairs

(1) General:

(a) Furnish all labor, equipment, and materials required to accomplish all carpentry work as indicated, specified or required.

(b) The contractor shall be responsible for required carpentry demolition, and the installation of new blocking, shims or furring as required to properly secure repairs.

(c) Materials:

(i) Dimensional lumber: All timbers shall be sized to match that which they replace, maximum moisture content 15%, species and tooling to match the existing.

(ii) Trim and boards: Exterior running trim and boards shall be #1, B and better S4S, KD, Species matched to existing, sized and shaped as detailed or required. Maximum moisture content at time of use 15%.

(iii) Nails: shall be in kind to the existing

(iv) Material for ducthman: Match existing material in size, shape and profile.

New material shall match existing wood species and grain characteristics, material shall be clear grain without knots, splits, checks or other defects.

(d) Work shall be done by experienced carpenters; cutting shall be neat and accurate. Work shall be installed plumb, level, true and straight with no distortions, closely fitted, well nailed and rigidly secured without splits caused by over nailing.

(e) Where new blocking is required it shall be sized for the conditions and loads encountered. It shall be securely nailed and properly aligned to support that which it is intended to support with no gaps or spaces. Blocking in contact with masonry shall be pressure treated for the prevention of decay and rot.

(f) Discard units of material which are unsound, warped, bowed, twisted, improperly treated, not adequately seasoned or too small to fabricate with the minimum of joints or optimum jointing arrangements or which are of defective manufacture with respects to surfaces, sizes or patterns.

(g) Match existing size, widths, shape and profile in new material and set multiple joints in a random pattern to blend with existing carpentry work remaining. Stagger joints in built-up moldings. Joints shall be mitered, plumb and square, with each piece carefully fitted and securely nailed. No butt joints in running trim or boards, scarf joints cut to shed water to the exterior.

(h) Standing and running trim shall be installed with the minimum number of joints possible, using full length pieces except when matching the existing joint pattern or construction detail. Cope at returns and miter at corners and comply with the “Quality Standards for Joinery”.

(i) Scribe and cutwork to fit closely to adjoining work. Refinish or repair damaged finish at cut surfaces. All new material incorporated into the work is to be primed on all sides intended to receive painted finishes, including end grain primed, see painting specification. Carpenters shall utilize white shellac primer to prime all field cuts before the material is incorporated into the work.

(2) Window repairs

(a) Windows General:

(i) Provide all labor, materials and equipment required for the removal, repair, cleaning, glazing and reinstallation of the existing wood window sash and casements and the repair of the existing wood frames, sills and casings including miscellaneous wood trim, stops and parting beads as scheduled, indicated or required. Details of construction for repair shall match the existing windows where they are to remain for size, shape and profiles of moldings and location and size of mortices. The location, number, size and type of pegs or pins shall match the existing where they are to remain. Where existing sashes are being replaced with period correct sashes, they shall match the details of construction in size, shape and profiles of moldings as well as the location, number and size of pegs or pins as identified by their period correct sashes. Provide new hardware as scheduled, indicated or required for conditions encountered. Where practical or no replacement is available and where approved by the COR existing hardware may be reused.

(ii) Replace sash cords and pullies as needed to ensure proper operation of the windows. Reuse the existing sash weights. Provide blocks for the upper sash if required to keep them in a fixed position.

(iii) The contractor shall submit shop drawings for new wood sashes detailing methods of construction and size.

(iv) Submit samples of glass, and each wood molding type, smallest practical sizes and quantities, before placing on the job.

(v) Materials:

Materials shall conform to the following:

1. Framing materials:

a. Wood frames and sashes shall match existing frame and sash materials

b. Exterior trim shall match existing trim material

c. Fasteners shall be nonmagnetic stainless steel warranted by the manufacturer to be noncorrosive and compatible with wood elements of the window units.

2. Glazing materials:

a. Float glass: ASTM C1036 Type 1, 3/16” clear, Type 1 Class 1

Quality Q3

b. Glazing compound: Interior/exterior premixed oil-based glazing compound. Formulated for wood, Color – white.

3. Sash cords:

a. Dacron, braided cord, ¼” diameter as required by length.

4. Hardware and accessories

a. Locks and latches shall match existing.

b. Sash lifts shall match existing.

c. Sash pulleys shall match existing.

(vi) Each sash shall be marked as to its original window opening prior to removal for repair/refurbishment. After repair/refurbishment each sash shall be reinstalled in its original location

(vii) Sash shall be removed from the site for cleaning, repair, repainting and reglazing. Paint shall be stripped, and existing glazing removed, broken, rotten or damaged rails, stiles or muntins shall be repaired or replaced. Repaired wood sashes shall be primed, painted and glazed. Replace any broken, cracked or scratched glass.

(viii) New sashes shall match that which they replace in size, details of construction and number of lites. Rails, stiles and muntins of the replacement sash shall match those of the sash they replace in size shape and profile. Period correct replacements shall match as identified by the

COR.

(ix) Prior to resetting/rehanging the sash, repair the frame, casing, sill and trim of each window. Replacement parts shall match that which they replace in size, shape and profile.

(x) Reglaze windows. The work includes the removal of the old failed or loose glazing compound and putty, cleaning of the wood sash and glass to receive the new glazing compound, replacement of any missing, broken or cracked glass, and reglazing the window sash after the prime painting. Sound tightly bonded glazing compound may remain. Blend new glazing compound with older sound glazing compound matching the profile of the existing. Do not apply thin or skim coats of glazing compound over the existing glazing compound left in place. Replacement glass shall match that which it replaces in thickness and size.

(b) Window Sashes: The work includes the removal of the existing sash from the frames for painting prep work including removal of paint as specified or required, and the repair and reglazing of the sash is required. Reinstallation of the same at the completion of repairs, including the rehanging of the sash with new sash cords utilizing the existing sash weights, new hardware and weather stripping as specified or required to achieve a weatherproof installation free of drafts and water intrusion is also included. The removal of the existing storm windows or plexiglass covers and their reinstallation after the work on the windows is completed is also included. The installation of temporary plywood security panels in the window openings while sashes are removed is also required. Repairs include the patching or filling of small gouges (greater than 3/32” in width and/or depth), the removal of sections of damaged or rotted wood rails, stiles and muntins and the replacement of the same with dutchmen repairs where less than 50% of a rail, stile or muntin is damaged. Full replacement required if damage exceeds 40% of a rail, stile or muntin. All new wood rails, stiles and muntins shall match the existing in size, shape and profile unless otherwise noted. Where damage is such that 40% or more of the wooden members of a sash must be replaced the contractor in consultation with and the agreement of the owner may fabricate a replacement sash in lieu of repairs. Replacement sash shall match the existing sash that it replaces in size, number of lites, shape and all molded profiles.

(c) Window Frames and Sills: Repairs include the repair or replacement of missing stops and trim, patching or filling of small gouges (greater than 3/32” in width and/or depth), the removal of damaged or rotted wood window framing members including jambs, fascia boards, interior trim, lintels and sills and the replacement of the same with new wood jambs, fascia boards, interior trim, lintels or sills matching the existing in size, shape and profile unless otherwise noted. Jambs fascia boards, interior trim or sills exhibiting rot or damage of less than 40% of the member may be repaired with a properly formed and shaped dutchmen. Dutchman repairs shall match the existing member in size, shape and profile. Lintels requiring repair due to significant damage or rot shall be replaced in their entirety.

v) Painting

(1) It is the intent of the work that all exterior wood elements and surfaces and all exterior exposed previously painted masonry shall be painted. Previously painted surfaces shall be cleaned and properly prepared to receive two coats of the required finish.

(a) Existing white stone surfaces shall be whitewashed.

(i) Premixed whitewash solutions must be submitted to the COR for approval

(ii) Field mixed whitewash solutions must have the components and mixing method submitted to the COR for approval

(b) Existing painted wood surfaces shall be painted with natural linseed oil paint color matched to the existing color.

(i) Color shall be submitted to the COR for approval.

1. Color shall be applied to a similar material to where it will be applied, covering no less than two square feet, and shall submitted to the COR for approval

(ii) Linseed oil paint product shall be Earth & Flax Viking Linseed Oil Paint or equivalent.

1. Product shall be submitted to the COR for approval.

(2) No roof shingles, metal roofs or flashing, metal gutters or rain leaders or attachments of the same, piping, unpainted conduit or wiring, unpainted brick or stone or unpainted parged brick or stone is to be painted unless called for or indicated in the contract documents. Provide drop cloths and masking to protect adjacent surfaces not required or indicated to be painted.

(3) Paint Preparation:

(a) The contractor shall provide all labor, equipment, material, supplies and tools to successfully complete the required work.

(b) It is assumed that the paints on the exterior woodwork include lead paint until tested. Should the lead test come back positive for lead all scraping and sanding under the paint prep work performed under this contract shall be performed by Lead Workers under the direct supervision of a Lead

Supervisor with current certifications in the Commonwealth of Pennsylvania and shall be undertaken in a manner to prevent the release of lead into the environment and that does not create further lead hazards Workers shall wear respiratory protection and protective clothing while performing the paint prep work. Post proper and/or required warning signs and rope off work site. Contractor shall provide a Lead Safety Plan that outlines the work, cleanup methods, signs and warning barricades, collection, storage and disposal methods for lead paint waste and worker protection prior to the start of the work and implement the plan should lead test come back positive. The contractor shall comply with applicable laws and regulations governing the removal and disposal of lead containing paint including:

(i) 40 CFR 745.61-339 US Environmental protection Agency – Lead Based

Paint Poisoning Prevention in Certain residential Structures.

(ii) 29CFR 1926.62 US Department of Labor, OSHA Safety and Health

Regulations for Construction Lead.

(iii) Title 35 Pennsylvania Statute Chapter 203, Department of Labor, Lead-

Base Paint Occupation Accreditation and Certification.

(iv) Title 25 Pennsylvania Consolidated Statute Chapters 260-270, Department of Environmental Protection, Hazardous Waste.

(c) Regardless of lead test results install two layers of 6mil plastic sheeting a minimum of ten feet (10’-0”) out from the base of the wall to capture paint chips and flakes. Securely anchor plastic sheeting to prevent wind uplift or displacement. No paint prep work shall occur without protective plastic sheeting in place. At the end of each workday or the completion of the paint prep work in a particular area the plastic sheeting shall be carefully rolled up and disposed of properly. Do not allow paint chips or debris to escape. No exterior paint scrapping shall occur when the wind speed is such that paint scrapings are likely to be blown beyond the protective plastic sheeting.

(d) All receipt copies of hazardous waste manifest and residual waste manifest from the disposal of lead waste must be returned to the park before the work will be considered complete.

(e) Positive lead test will require all horizontal surfaces where lead paint flakes and dust may collect shall be HEPA vacuumed and wet wiped to remove loose debris. Loose paint flakes and dust shall be collected, containerized and disposed of in accordance with state and federal hazardous waste regulations.

(f) Perform preparation and cleaning procedures in accordance with paint manufacturer's instructions and as herein specified, for each substrate condition.

(g) Where practicable remove hardware and similar items. Where hardware is left in place and is not to be painted, provide surface applied protection prior to surface preparation and painting operations. Remove any items, if necessary, for complete painting of the adjacent surfaces. Following completion of painting of each area, reinstall removed items, and/or remove applied protection.

(h) Clean surfaces to be painted as needed after carpentry but before applying primer or paint. Remove oil and grease prior to cleaning. Schedule cleaning and painting so that contaminants from cleaning process will not fall onto wet, newly painted surfaces. Use only low-pressure water spray and nylon or natural bristle brushes and approved nontoxic cleaner. Rinse areas thoroughly to remove cleaner residue and allow surfaces to dry before painting.

(i) Prepare cementitious surfaces including concrete, concrete block, cement plaster and cement composition board to be painted by removing efflorescence, chalk, dust, dirt, grease, oils, and by roughening as required to remove glaze.

(j) Clean wood surfaces to be painted of dirt, oil, or other foreign substances with scrapers and mineral spirits, as required. Where scrapping is to be carried out on wetted surfaces rewet surfaces as needed to prevent dust.

Limited sanding maybe required in some areas, only HEPA Assist sanding equipment will be allowed for lead work. No hand sanding or other types of mechanical sanding will be allowed. Scrape and clean small, dry, seasoned knots and apply a thin coat of white shellac or other recommended knot sealer, before application of priming coat. Normal, uniform weathering of the wood does not constitute an imperfection requiring sanding or other prep beyond washing.

(k) Materials:

(i) Cleaner: Nontoxic cleaner, biodegradable non bleach cleaner, formulated for low pressure application.

(4) Surfaces receiving the specified number of coats that show insufficient coverage, bleed through, or other defects of coverage shall receive additional applications until such defects are corrected and proper results obtained.

(5) The Contractor shall submit a manufacturer’s standard color chart for manufactured products meeting the requirements of the paint specifications from which the paint colors shall be selected. Whitewash does not require a color sample.

(6) Mix and prepare paint materials in accordance with the manufacturer’s directions. Paint shall be applied at the rate and thickness recommended by the manufacturer. All paint application shall be by brush.

(7) Job Conditions:

(a) Apply water base paints and washes only when temperature of surfaces to be painted and surrounding air temperatures are between 45 degrees F and

95 degrees F.

(i) Do not apply paint in snow, rain, fog, or mist; or when relative humidity exceeds 85%; or to damp or wet surfaces.

(ii) Painting may be continued during inclement weather if areas and surfaces to be painted are enclosed and heated within temperature limits specified by paint manufacturer during application and drying periods.

(8) Store materials not in actual use in tightly covered containers. Maintain containers used in storage, mixing and application of paint in a clean condition, free of foreign materials and residue.

(9) Stir materials before application to produce a mixture of uniform density and stir as required during application. Do not stir surface film into material. Remove film and, if necessary, strain material before using.

(10) All painting will be done by experienced workmen and only first-class work will be permitted or accepted.

(11) Give special attention to ensure that all surfaces, including edges, corners, crevices, recesses, welds, and exposed fasteners receive a dry film thickness equivalent to that of flat surfaces.

(12) Do not paint over dirt, rust, scale, grease, moisture, scuffed surfaces, or conditions otherwise detrimental to formation of durable paint film.

(13) Apply first coat material to surfaces that have been cleaned, pretreated or otherwise prepared for painting as soon as practical after preparation and before subsequent surface deterioration.

(14) Allow sufficient time between successive coatings to permit proper drying.

Do not recoat until paint has dried to where it feels firm, does not deform or feel sticky under moderate thumb pressure and application of another coat of paint does not cause lifting or loss of adhesion of the undercoat.

(15) Where touch-up work is required, paint entire elements or surfaces to logical termination point (edges, corners, etc.). Do not touch-up by spot painting.

(16) Apply materials at not less than manufacturer’s recommended spreading rate to establish recommended total dry film thickness.

(17) Completely cover to provide an opaque, smooth surface of uniform finish, color, appearance and coverage. Cloudiness, spotting, holidays, laps, brush marks, runs, sags, ropiness or other surface imperfections will be corrected and refinished.

(18) Upon completion of painting work, clean window glass and other paint spattered surfaces. Remove spattered paint by proper methods of washing and scraping, using care not to scratch or otherwise damage finished surfaces.

(19) Materials: All materials used in painting shall be delivered to the site in the manufacturer’s original unopened containers.

(a) All paint materials to be used shall be submitted to the COR for approval prior to application. This includes but is not limited to encapsulation paints and primers, Latex paints, Oil-based paints, Linseed oil and pine tar mixture and all primers.

(b) The use of premixed whitewashes, Linseed oil, and pine tar may be used if approved by the COR. Contractor shall submit the manufacturer data sheets for approval prior to application in the field.

(20) Thoroughly wet the area to be whitewashed or painted with clean potable water prior to applying the finish. Apply the finish with a thick brush.

(21) Workers must wear protective eyewear and use liquid gloves or a good lotion for hands and arms as material is caustic. Gloves are not recommended.

5.0 GOVERNMENT FURNISHED EQUIPMENT / MATERIALS / OTHER:

a. Equipment:

1. None

b. Materials:

1. None

c. Facilities:

a) The government will provide no facilities to the contractor.

b) There are restroom facilities provided throughout the park that the contractor may use. However, there are no restroom on site for the contractor to use. It is recommended that the contractor provide a chemical toilet for their, and their employees, use while on site.

c) A staging area will be designated for the contractors use.

d. Utilities:

1. The contractor shall be responsible for providing all required utilities.

6.0 SPECIAL CONDITIONS / REQUIREMENTS:

a. The structure is located closely to Yellow Springs Road. The contractor shall provide construction fencing along the road at the work site for worker safety.

b. Any ground disturbance shall require a minimum of three workdays’ notice to schedule the park archaeologist.

7.0 PLACE OF PERFORMANCE:

a. VALLEY FORGE NATIONAL HISTORICAL PARK

a) STIRLINGS QUARTERS: 547 Yellow Springs Rd, Malvern PA 19355

i. STIRLINGS BARN IS LOCATED ACROSS YELLOW SPRINGS ROAD FROM

STIRLINGS QUARTERS.

8.0 PERFORMANCE PERIOD / SCHEDULE REQUIREMENTS:

a. The period of performance shall be three (3) months from the notice to proceed for all work of this project.

b. Recognized Holidays:

1. The contractor is not authorized to work at the site on Federal Holidays or weekends unless specifically authorized in writing by the NPS Contracting Officer.

Requests to work over a holiday or weekend must be received no less than 5 working days prior to the holiday.

c. Hours of Operation:

1. The contractor is responsible for conducting business at the site between the hours of 7:00 a.m. and 3:30 p.m. Monday through Friday, except Federal holidays or when the government facility is closed due to local or national emergencies, administrative closings, or similar government directed facility closings. Work outside of these hours will not routinely be approved and must be requested with the Park and

COR no less than three (3) days prior.