A04_0040512655_02_20201118_Statement_of_Work.pdf

STATEMENT OF WORK

Cyclic Maintenance Work at Atwood Higgins House

CAPE COD NATIONAL SEASHORE

Bound Brook Island Road, Wellfleet, MA

November 18, 2020

Scope This project is for cyclic maintenance and component replacement at the Atwood-Higgins House, a National Register-listed property at Cape Cod National Seashore.

The contractor shall minimize disturbance to the site to the greatest extent possible unless directed otherwise.

The contractor shall provide all labor, materials, tools, and equipment required to complete this work.

All work performed under this contract shall be done in accordance with applicable local, State, and Federal codes, bylaws and ordinances in effect at the time of this work.

Work at the Atwood Higgins House shall include:

• rake and repoint brick chimney masonry mortar joints (approximately 84 sf);

• replace chimney flashing (chimney is approximately 36” deep by 44” wide), and flashing at shed roof over cellar entrance (approximately 3’-8”, 4 lf);

• replace and paint the wood shingle siding on the north (approximately 200 sf) and west

(approximately 300 sf) sides;

• replace approximately 1365 sf of wood shingle roofing including cellar ell shed roof, and ridge boards (ridge is approximately 40’ long);

• perform structural augmentation of wood roof purlins (approximately 128 lf);

• replace southeast cornerboard (approximately 16 lf);

• replace previous dutchmen repairs on cornerboards (approximately 24 lf);

• replace rakes and subrakes (approximately 40 lf);

• replace bottom skirtboard (approximately 50 lf);

• repair/replace all deteriorated door sills/thresholds (approximately 6 lf);

• scrape and paint beaded and unbeaded clapboards on south elevations (approximately 235 sf);

• repair/replace cellar entrance ell boards (ell is approximately 44 sf);

• repair and reattach 2 hinges on exterior cellar door;

• repair wood gutters (approximately 80 lf);

• replace all galvanized metal downspouts and related components in kind, replace couplings and band clamp fasteners (approximately four for a total of approximately 40 lf);

• repair, reglaze and paint all windows on first floor (approximately 14) and louvered openings on second floor (approximately 3);

• paint the entire exterior including all trimboards and cellar entrance ell (approximately1540 sf siding, approximately 525 sf trim).

• repair and paint three exterior doors (approximately 2’-5 ¾” wide by 6’-8” high; approximately 2’-7

¼” wide by 6’-8” high; approximately 2’-9” wide by 6’- 8” high).

• paint existing east elevation wormy cypress shake wall to match finish work on other sides

(approximately 375 sf).

Measurements Estimated dimensions and quantities are provided as a guide only. The contractor is responsible for verifying all measurements and dimensions. The contractor shall take all measurements for quantities of materials and note existing conditions for the installation of new work. All ancillary work, cutting and /or removal of existing work necessary for the installation of new work shall be done as required as part of this contract.

Site Examination It is the responsibility of the contractor to examine the work site to confirm existing conditions and required quantities prior to submitting a proposal on this project. The contractor may arrange a site visit by contacting the Contracting Officer (CO) between 8:00 a.m. and 4:00 p.m. on non-holiday weekdays. Telephone 508-957-0709.

It is strongly suggested that locations and dimensions be field verified by the contractor prior to submitting a quote.

Historic Nature of Work Site The contractor shall note the historical significance of the site upon which the work will be performed.

Because of the historic nature of this site, certain aspects of the work of this Contract will not be carried out with materials and/or methods commonplace in the modern construction industry. It shall be incumbent upon the contractor to furnish staff who can execute first-class workmanship in the materials and methods specified, and who will take any necessary precautions to protect the elements of this historic site not scheduled to receive work.

Utilities and Services The contractor shall provide and maintain sanitary facilities for workers.

The contractor shall be responsible for locating and preventing damage to known utilities. If damage occurs, repair utility at no additional expense to the Government. Notify Contracting Officer and utility companies of proposed locations and times for excavation. If damage occurs to an unknown utility, repair utility and immediately notify Contracting Officer.

Water Service: Water from existing water system is normally available for use without metering and without payment of use charges. Provide connections and extensions of services as required for construction operations without any additional permit costs. If water is not available, the contractor shall supply temporary potable water adequate to the needs of the contract at no additional cost to the contract for project use.

Electric Power Service: Electric power from existing system is normally available for use during construction without metering and without payment of use charges. Provide connections and extensions of services as required for construction operations without any additional permit costs.

Arrange with utility company and government for time when service can be interrupted, if necessary, to make connections for temporary services. If electric power is not available, the contractor shall provide temporary power at no additional cost to the contract for project use.

Permits and Approvals The contractor is responsible for contacting Dig Safe (#811) or other approved utility marking entity for pre-marking of all underground utility locations within project area prior to any ground disturbance.

Prior to commencement of any on-site work, provide Contracting Officer with copies of proof of pre-marking from utility marking entity.

Obtain all required permits for the performance of the work specified in Contract Documents at no additional cost to the contract.

Submittals and Deliverables Submit a safety plan that complies with OSHA standards within 3 business days after award.

The contractor’s representative shall have an updated First Aid card. A fall protection plan shall be posted or made available prior to start of elevated work or any other time it is required.

Submit an environmental protection plan that addresses protection of existing landscape elements, including lawn areas, trees and shrubs within 3 business days after award.

The contractor shall propose location of laydown and stockpile area for NPS approval.

Provide detailed proposed project design, layout, and schedule prior to commencing any work on site.

Product Data: provide manufacturers' literature on characteristics of materials, maintenance, parts list and warranties. Submit only pages which are pertinent. Mark each copy to identify pertinent products referenced to the specifications. Provide manufacturers’ literature, drawings, and technical data sufficient to fully define the material and to demonstrate full compliance with the contract specifications.

Manufacturer's Installation Instructions: Include special precautions from manufacturer.

Drawings: submit drawings as appropriate.

Materials: submit representative samples of all materials to be used in sizes adequate to define the purpose of the material and determine its suitability.

Manufacturer's certificate: certify that products meet or exceed specified requirements.

Perform the work of this contract.

Safety and Environmental Protection Requirement This building was constructed prior to 1978, therefore, work may disturb lead-based paint. It is not the government’s intention to abate lead paint under this contract. The contractor shall protect contractor’s personnel and the public during the performance of any work that may disturb lead-based paint. Waste materials meeting the criteria of hazardous waste shall be disposed of as such in a legal manner.

Maintain project area in a neat, orderly and safe condition at all times. All work areas shall be made secure and safe after hours, on weekends and holidays.

All debris and removed material are the property of the contractor and shall be recycled or legally disposed of in a manner that is consistent with local and state regulations. All waste, trash and debris generated as part of this project must be secured from wind and rodent action.

Take all necessary precautions to prevent fire during construction. Provide and maintain suitable fire protection equipment. Protection Equipment Required: Furnish a minimum of one UL Class 2A, 2-1/2 gallon water type stored pressure extinguisher, and one UL Class 10, Type I, 15 pound A:B:C carbon dioxide extinguisher at each work site.

No radios or smoking (including vaping) will be allowed on the job site. Confined space entry, fall protection and hardhat use shall conform to safety rules and regulations.

The contractor is responsible for securing the site and the work of the contract. During the execution of this contract, the contractor shall conform to the rules and regulations as set forth by OSHA Safety and Health Standards. Provide barriers, temporary fencing, signage, etc. wherever work could cause injury to workers or visitors, and ensure that ladders, scaffolding and equipment are secured from public access during off-hours.

Provide and maintain environmental protection during the life of the Contract to control pollution or to correct conditions that develop during construction.

Equipment shall not be allowed to operate outside the limits of work or to disturb existing vegetation.

Construction equipment shall be kept in good repair, without leaks of hydraulic or lubricating fluids.

The contractor must visually inspect all equipment prior to commencing work every day and at the mid-point in the workday for leaks. If such leaks or drips do occur, they shall be cleaned up immediately.

Confine equipment maintenance to one location. Control runoff in this area to prevent contamination of soils and water. No equipment repair will be allowed on the site.

It is the contractor’s responsibility to ensure that any disturbance or damage done during the course of this project to the existing utilities, landscape, building or government materials, shall be repaired or restored to its original condition by the contractor at the contractor’s expense prior to completion of the job.

Work and Weather Limitations Regular work hours are between 7AM to 4PM Monday through Friday. Unless otherwise requested and approved in advance, no work shall take place after hours, on holidays or weekends. Requests must be made 48 hours in advance.

The contractor shall be responsible for storage of all materials and equipment; the Park must approve the contractor’s use of any space on the site in advance.

While not expected, it is possible that buried archeological features or deposits may be located in the vicinity of the project. Work must be stopped immediately if there is discovery of any such articles, and the Contracting Officer’s Representative (COR) must be notified at once. A government Archeologist/Historian may monitor ground disturbing work and has the authority to stop the work if any potential archeological resources are unearthed.

Proceed with project only when existing and forecasted weather conditions will permit work to be performed according to manufacturers' recommendations and warranty requirements. Ensure temperatures are over the minimum installation temperatures recommended by material manufacturers.

Security and Safety The contractor shall have unescorted access to the construction site. Coordinate with the COR for access to all locations.

The COR or the COR’s alternate will not be required to be at the site location during all working hours.

Regulations

• Occupational Safety and Health Administration (OSHA)

• National Institute for Occupational Safety and Health (NIOSH)

• Massachusetts General Laws and Department of Environmental Protection regulations and statutes

• Town Board of Health Regulations

Materials Furnish, supply, and install all necessary materials to successfully complete the project requirements.

Unless explicitly indicated, new materials shall match those being replaced.

All new materials to be used in shoring up attic framing members (purlins) shall be date stamped to identify repair work chronology.

Trim and Ridge Lumber Trim and ridge board materials shall be STK grade red cedar, surfaced four sides; sizes and profiles to match existing.

Self-adhered roofing underlayment – if needed Membrane composed of two waterproofing materials—a rubberized asphalt adhesive backed by a layer of slip resistant coated high density cross laminated polyethylene film that has the following characteristics:

• 40 mil (1.02 mm) thick per ASTM D3767 method A, a membrane tensile strength of 250 psi (1720 kN/m2) per ASTM D412 (Die C modified);

• membrane elongation of 250% per ASTM D412 (Die C modified);

• low temperature flexibility to at least -20°F (-29°C) per ASTM D1970;

• adhesion to plywood of 3.0 lbs/in. width (525 N/m) per ASTM D903;

• maximum permeance of 0.05 Perms (2.9 ng/m2s Pa) per ASTM E96;

• a maximum installed material weight of 0.3 lb/ft2 (1.3 kg/m2) per ASTM D461.

Self-adhered roofing underlayment shall meet the following standards:

• ICC ESR-1677 approval according to C-48 Acceptance Criteria for Self-Adhered underlayments used as Ice Barriers;

• 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, P824;

• Underwriters Laboratories Inc. Class A fire classification under fiber-glass shingles and Class C under organic felt shingles (per ASTM E108/UL 790);

• CCMC Approval No. 13670-L.

As an advisory to the contract, Grace Ice and Water Shield meets the above-listed criteria.

Rain Screen Black nylon ventilated underlayment three-dimensional open mesh with a thickness of 0.277 inches (7.04 mm), weight of 9.7 lbs/roll and a fire Rating of A. As an advisory to the contract, Cedar Breather meets the requirements of this contract.

Roofing Materials Cedar roofing shall be red cedar shakes manufactured by members of the Cedar Shake & Shingle Bureau graded in accordance with UBC Standards No. 15-3 and/or CSA 0118.1, split face and sawn back, 18” x ¾” minimum, Premium Grade All Clear, no defects, Heartwood 100% edge grain random widths, minimum width shall be 4", Thickness shall be nominal with a minus tolerance of 1/16" in 10% of the bundle.

Starter-finish Course: Length 15”. For use on the underlying starter course at eave lines and for the final course at ridges where trimming would otherwise be necessary and full-length shakes are not needed.

Gutters Gutters shall match existing wood gutters, including finish. Gutter outlet shall be 16oz Copper B Style Outlet for Half Round Gutter.

Gutter preservative Oil preservative treatment for use on interior surfaces of wood gutters shall be a low viscosity, non-staining, penetrating oil specifically designed for use on wood roof components such as Chevron Shingle and Shake Oil as manufactured by ChevronTexaco Corp, or approved equal.

Epoxy consolidant for gutter end grain shall be one-part polyurethane high-performance sealant, “Liquid Wood” by Abatron or an approved equivalent.

Downspouts Downspouts and elbows shall be 26 gauge smooth galvanized steel, length, diameter and shapes to match existing, with all necessary fittings to provide a complete roof drainage system.

Flexible couplings shall be designed for the purpose and for underground conditions, size compatible with downspouts and underdrainage. As an advisory to the contract, Fernco Flexible Couplings meet the above-listed criteria.

Band clamp fasteners for couplings shall be stainless steel, sized and designed for the purpose.

Straps for wood downspout offsets shall be galvanized steel to match existing.

Dimensional and structural lumber Wood to match existing species, shape and dimensions. All material shall be the best of its respective kind, free from stain, rot, or other imperfections impairing strength or durability.

Wood for window, door, and trim repair and structural repairs shall match existing in species, shape and dimensions.

Wall and roof sheathing/decking Wood to match existing species, shape and dimensions. All material shall be the best of its respective kind, free from stain, rot, or other imperfections impairing strength or durability.

Hardware cloth Shall be hot-dipped galvanized fabric with ¼” mesh, standard to the industry.

Siding Materials House-wrap siding underlayment for application over wall sheathing shall be nonwoven spun, water-resistant, extremely fine fused high-density polyethylene (HPDE) lightweight, breathable pliable fabric made to resist bulk water and air penetration, reduce mold and water damage, stop air movement through walls and allow moisture vapor to pass through. As an advisory to the contract, Dupont Tyvek meets the above-listed criteria.

Cedar shingles shall be white cedar shingles premium grade, resquared and rebutted all clear Grade A from top–quality northern Maine Eastern white cedar to match existing in material and species, size, thickness, exposure and appearance.

Cedar clapboard siding for repairs shall be kiln-dried plain bevel ½” X 6”clear vertical grain heartwood per NLGA paragraph 201a, Western Red Cedar, factory finished, beaded to match existing where beaded, and color to match existing.

Wood Patching Materials Use patching products of a single manufacturer to ensure best performance.

Wood Consolidant: Ready-to-use product designed for hardening and sealing soft fibers of wood materials that have deteriorated due to weathering and exposure and designed specifically to enhance the bond of wood patching compound to existing wood. Subject to meeting the salient characteristics specified and COR approval, the following products are acceptable:

• Abatron, Inc.; Liquidwood;

• Advanced Repair Technology; Primatrate;

• Gougeon Brothers, Inc.; West System;

• Other products meeting the specified salient characteristics and as approved by the COR.

Epoxy for Wood Repair: 2-part epoxy-resin wood compound with a 10 to 15-minute cure at 70 deg F, in knife grade formulation and recommended by manufacturer for type of wood repair indicated.

Compound shall be designed for filling damaged wood materials that have deteriorated due to weathering and exposure. Compound shall be capable of filling deep holes and capable of spreading to feather-edge. Subject to meeting the salient characteristics specified and COR approval, the following products are acceptable:

• Abatron, Inc.; Liquidwood with WoodEpox;

• Advanced Repair Technology; Primatrate with Flex-Tec HV;

• Gougeon Brothers, Inc.; West System;

• Other products meeting the specified salient characteristics and as approved by the COR.

Wood Finishes Finishing products for use in the work shall be the standard best or top brands produced for each particular kind of material required herein. The label on the primer container should indicate that the coating is recommended for use as stain blocking primer for Western Red Cedar. Highest quality, standard brand, latex stain-blocking primer and paint as recommended for exterior use. Provide primers and other undercoat paint produced by same manufacturer as finish coats. Acceptable manufacturers: 1. Sherwin Williams; 2. Benjamin Moore; 3. Valspar; or equal meeting the specified salient characteristics and as approved by the COR. Paint primers, sealers, and undercoats shall match be suitable for the substrate and compatible with the finish coat and each other. Finish coat color shall match existing.

All new trim material shall be factory pre-finished on all six sides of each board. All wood trim finishes shall be highest quality, standard brand, stain-blocking primer and latex paint as recommended for exterior use with mold and mildew inhibitors, factory applied to all surfaces of new wood materials in a manner consistent with manufacturer’s recommendations and best practices of the industry. Color to match existing. One coat primer and two coats of finish coat to match existing in color.

Existing trim to remain shall be finished with highest quality, standard brand, latex paint as recommended for exterior use with mold and mildew inhibitors in a manner consistent with manufacturer’s recommendations and best practices of the industry. Color to match existing.

Obtain the same products used in factory finish for treatment of all field cuts prior to installing cut material, in accordance with manufacturer’s recommendations.

Caulking for joints or gaps around doors, windows, or siding where water invasion may occur shall be non-shrink high-performance acrylic-latex, acrylic, acrylic-silicone, polyurethane, polysulfide or terpolymer rubber materials compatible with specified finishes, such as Benjamin Moore Elastomeric 465 01 Caulk, or an approved equivalent. Pure silicone and clear caulks do not work well on Western Red Cedar and shall not be used in that application.

Fasteners Fasteners shall be sized for intended purpose, according to best practices of the industry.

Fasteners for shingles and shakes shall be of a length sufficient to penetrate into the sheathing at least ¾”, stainless steel type 316 ring shank blunt tip nail with minimum 7/32" head. Likely length of fastener:

1 ½” to 1 ¾”” long. In no circumstances shall fasteners be long enough to penetrate all the way through the plank wall construction and damage interior finishes.

Fasteners for clapboard siding shall be splitless stainless steel fasteners designed for siding installation with a thin shank and blunt point with either ring or spiral shank. Fastener length should be adequate to provide a secure penetration into solid wood. In no circumstances shall fasteners be long enough to penetrate all the way through the plank wall construction and damage interior finishes.

Fasteners for structural repairs shall be hot-dipped galvanized, sizes and types to conform to best practices of the industry.

Stainless steel staples will only be allowed to install water-resistant barrier and hardware cloth under siding. No other use of staples will be allowed.

Chimney and Foundation materials Wherever possible, existing bricks from the chimney and foundation shall be retained. Where new brick is required, brick shall comply with ASTM C 216, grade SW, type FBS specification, and match the existing bricks in dimension, shape, color, flash characteristics, surface texture and edge characteristics.

All replacement brick shall be submitted for acceptability as to color and appearance match with the existing brick. No brick shall be purchased or installed until approval is obtained. Historic bricks shall be placed as visible infill and new masonry materials shall be used in non-visible areas.

Mortar shall be suitable in strength for the brick being used and appropriate for the application. Match the existing mortar as closely as possible, for color, cement content and compressive strength.

Repointing mortar shall be Type N (1 part Portland Cement, 1 part lime, and 6 parts sand), conforming to ASTM C270 Specifications and shall match the existing in color, texture, and appearance.

Portland Cement: ASTM C-150, Type 1, white or gray as required to achieve a match of the existing mortar color. Masonry Cement will not be permitted.

Hydrated Lime: ASTM C-207, Type S, Hydrated Lime for Masonry Purposes. Air entrained lime will not be permitted.

Aggregate conforming to ASTM C-144: Aggregate shall be clean, well-graded sand, matching the color and grain size of aggregates in the original mortar.

Coloring pigment: a non-fading, lime proof, inorganic mineral oxide pigment up to 10% of the cement content by weight may be utilized in the mix to match the appearance of the existing mortar.

Acceptable products shall be SGS Mortar Colors, as manufactured by Solomon Grind-Chem Service, Inc., Springfield, IL or similar products as manufactured by Empire White Products Company, Landers-Segal Company or approved equal.

Anti-freeze compounds, bonding and air entraining agents will not be permitted in the mortar.

Lead-coated copper shall be 16 oz. and 20 oz. cold rolled sheet copper conforming to ASTM B-101-12 Type I, Class A Specifications. Lead coating shall be applied by hot dip process at 6 to 7.5 pounds per 100 square feet. Plan copper shall conform to ASTM B-370-12.

Sheet Flashing shall be ASTM A 361/A361M; 26 Gauge (0.45 mm) steel with minimum G115/Z350 galvanized coating, ASTM B 209; 0.025 (0.63mm) thick aluminum, mill finish or ASTM B 370; cold rolled Copper; 16 ounces per square foot (0.55mm), natural finish.

Rivets shall be 3/16’’ diameter copper.

All accessories including nails, screws and clips shall be copper, brass, stainless steel or galvanized steel and completely compatible with the surrounding metal to prevent galvanic reaction.

Solder for lead coated copper shall be 60% block tin and 40% pig lead conforming to ASTM Specifications B32, Grade SN60.

Flux for copper shall conform to ASTM B32, Type IS.

Sealant required for incidental sheet metal and flashings work shall be one-part acrylic conforming to Fed. Spec. TT-S-230 or approved equal.

Sealant for exposed locations shall be one-part polyurethane sealant conforming to ASTM C920, Type S, Grade NS, Class 23, Uses NT, M, A, and O, such as Dymeric by Tremco, Sikaflex 1a by the Sika Corp., Vulkem 116 as manufactured by Mameco International, Inc. or approved equal.

Mastic for back-sealing sheet metal against non-metal substrates shall be as recommended by the shingle or underlayment manufacturer. Concealed sealant for back-sealing metal-to-metal connections shall be single-components, butyl (polyisobutylene) rubber sealant, heavy bodied for joints with limited movement.

Chemical adhesives, welding agents and sealants shall conform to requirements of manufacturer of each material being installed, and designed for the intended purpose. Asphalt Roofing Cement: ASTM D 4586, Type I or II.

Glazing compound shall be linseed oil putty.

Workmanship The contractor is responsible for appropriate quality control and workmanship shall be the best of their respective kinds and in full accordance with applicable codes.

Make sure all work is flush, square, level and has proper reveals per manufacturer’s specs. If not sure ask COR before starting.

When a manufacturer or a standard uses subjective words, e.g., “should, could, may”, etc., these words shall mean “shall, will, required”, etc. When the word “recommended” is used, it shall mean “required”. If there is a conflict between general and specific provisions, the specific shall govern.

The AAMA 2400-2 manual, the Exterior and Interior Wall Manual published by the Cedar Shake and Shingle Bureau, and all standards and recommendations referred to by the manufacturers shall be applicable.

Ensure that all work is free from dirt, damage or defects. Pick up extra materials within 2 days of job completion. Do not use windows for access or to pull cords, hoses or siding materials though.

Do not cut through trim or siding while on the building to avoid damaging the underlayment. Do not nail cleats or wood blocks onto or in finished siding products. Appropriate manufacture cleats shall be used that slide up under shingles. Never splice trim or siding when full-length material will fit.

Upon Notice to Proceed, the contractor shall make steady and uninterrupted progress toward the completion of the work of this contract.

Deconstruction The intent of the project is to preserve all existing building materials in situ wherever possible and salvageable, unless specifically indicated to be replaced.

Before beginning any deconstruction work, inspect and examine the site to determine the extent of the work. Take necessary precautions to avoid damage to existing items, including trees, to remain in place, to be reused, or to remain property of Government.

Provide waste-collection containers in sizes adequate to handle waste from construction operations.

Comply with requirements of agency(ies) with jurisdiction.

Unless otherwise indicated, disposal of removed materials shall be the contractor's responsibility. All debris and removed material are the property of the contractor and shall be recycled or legally disposed of in a manner that is consistent with local and state regulations.

Installation All work shall be done in conformance with the Secretary of the Interior Standards for the Treatment of Historic Properties.

The walls of the Atwood Higgins House are single wall/plank construction (meaning there are no studs -the wall finishes (interior and exterior) are attached to vertical boards which are attached to plates at top and bottom). Repairs must be carefully made to not damage interior finishes.

Preserve all existing building materials in situ wherever possible using wood patching materials as described elsewhere in this document. Only as a last resort and only after approval by COR, replace damaged and rotted material with new sound material according to the best practices of the industry.

Finished repairs shall match existing in materials, size, configuration and appearance.

Remove and reinstall any wall and roof mounted items as required to maintain a weather-tight roof and wall. Remove and reinstall or replace gutters and downspouts as required to perform the work of this contract.

Cedar roof and siding exposure shall match existing.

For cedar shingle siding, follow the installation procedures described in the Cedar Shake & Shingle Bureau Wall Manual unless otherwise indicated herein. For clapboard siding, follow the installation procedures described in Western Red Cedar Lumber Association literature.

Install trim and clapboard siding with smooth side out.

Store materials so they remain clean and dry. Provide a waterproof and weatherproof protective cover over all work areas after existing roofing material has been removed and before new roofing is installed, to prevent interior damage to the buildings.

Work shall be performed only during dry weather conditions. Except as otherwise specified, work shall be performed only on dry surfaces. Prior to leaving for the day, all areas open to weather shall be made water and weather-tight until the commencement of work the next workday.

Apply the same products used in factory finish on all field cuts prior to installing cut material, in accordance with manufacturer’s recommendations.

Structural and framing repairs After approval by COR, carefully excise rotten sections of sill, rafters, posts and framing members. Leave keys to receive repairs, Replace rotten wood with dutchmen repairs. Apply reinforcing gussets as needed and fasten all with appropriate fasteners. Remove rotten framing members, key in repairs where needed, reinforce as needed.

Perform structural augmentation of wood roof purlins. Each section of purlin should be carefully inspected to determine condition. Maintain attic framing to the maximum extent by sistering structural members that are insufficient. Purlins which are in poor condition shall be replaced in kind with dimensional lumber ranging from 2x4 to 4x6. Since there is a wide variety of sizes, each must match existing.

Cedar shingle siding Take note of and measure exposure on existing siding in order to replicate with new siding.

Remove existing shingle siding down to bare wood substrate.

Preserve all existing wall sheathing in situ wherever possible using wood patching materials as described elsewhere in this document. Only as a last resort and only after approval by COR, replace damaged and rotted material with new sound material according to the best practices of the industry. Finished repairs shall match existing in materials, size, configuration and appearance.

Coordinate installation of siding with installation of water resistive barrier, hardware cloth, rain screen, flashing and other adjoining work to ensure proper sequencing. Review flashing procedure with COR prior to installing any flashing. Install flashings around doors and windows and all other wall penetrations to remain to prevent moisture from entering the wall spaces. Complete flashings as required during and at the conclusion of siding. Install drip edges and other flashing as recommended by the siding manufacturer. Install Z flashing at bottoms of walls and all wall penetrations in accordance with manufacturer’s guidance. Install flashing at wall/roof and siding/trim interface in accordance with best practices of the industry and manufacturer’s guidance.

Install water-resistive barrier with penetration and junction flashing in accordance with local building code requirements and manufacturers applicable recommendations.

Install one layer of ¼” mesh galvanized hardware cloth over water-resistive barrier with stainless steel staples, install rain screen.

Install shingle siding with exposure to match existing as recommended by the Cedar Shake & Shingle Bureau. Use two fasteners per shingle ¾” in from each edge and 1” above the butt line of the overlapping shingle, use 3 nails on shingles wider than 6”. Leave a keyway of at least 1/8” between shingles – shingles shall not touch. Joints of successive courses must be offset by at least 1 ½”.

Fasteners must penetrate underlayment at least ½”. Do not penetrate all the way through the plank wall construction and damage interior finishes.

Roofing

Take note of and measure exposure on existing roofing in order to replicate with new roofing.

Remove existing roof. Preserve all existing roof sheathing and self-adhered roofing underlayment in situ wherever possible using wood patching materials as described elsewhere in this document. Only as a last resort and only after approval by COR, replace damaged and rotted material with new sound material according to the best practices of the industry. Finished repairs shall match existing in materials, size, configuration and appearance. Any replaced member shall span a minimum of three support members (rafters), unless decking material is tongue & groove- exposed from the underside, in which case the deteriorated member replacement shall span at least one truss width.

Install cedar shake roof according to manufacturer’s guidance and best practices of the industry. Install self-adhered roofing underlayment over repaired/replaced decking. Tack down rain screen. One tack (or nail) approximately every 3 square feet is adequate. Install with dimples down to present the flat side as the nailing surface. Do not lap layers of rain screen. Each course should butt against previous course.

Work from fascia to ridge just ahead of shingle and felt installation to avoid walking directly on rain screen (may be slippery, especially when wet). Allow 1/4" for rain screen thickness.

Coordinate installation of shakes with flashing and other adjoining work to ensure proper sequencing.

Install flashing, roof boots and drip edge. Form flashing to profiles to match that which was removed and to protect roofing materials from physical damage and shed water. Form sections square and accurate to profile, in maximum possible lengths, free from distortion or defects detrimental to appearance or performance. Weather-lap joints minimum 2 inches. Seal work projecting through or mounted on roof with asphalt roofing cement and make weather tight. Verify that roof penetrations are in place and flashed to deck surfaces. Drip edge shall be installed around entire perimeter of roof.

Install cedar shakes. Shakes must be doubled at all eaves. Butts of first course shakes shall project the same distance as existing beyond the fascia and over the gable or rake end. Spacing between adjacent shake (joints) should be a minimum of 1/4" and a maximum of 3/8". Shakes shall be laid with a side lap not less than 1 1/2" between joints in adjacent courses, and not more than 10% shall be in direct alignment in alternate courses.

Each shake shall be applied with two nails. Nails shall be applied approximately 3/4" from the edge and approximately 1 1/2" above the exposure line. Nails shall be long enough to penetrate into the sheathing at least 3/4" or all the way through. Nails must be driven flush with the surface of the shake.

Overdriven nails will be rejected and require replacement of the shake.

Window, sill/threshold, door, soffit, fascia, clapboard siding, trim, cornerboard and gutter repairs Verify actual extent of deteriorated wood at each location. Preserve all existing components in situ wherever possible. Only as a last resort and only after approval by COR, replace damaged and rotted material with new sound material according to the best practices of the industry. Finished repairs shall match existing in materials, size, configuration and appearance.

If deterioration is less than 1/8 inch deep, no repair is necessary. Fill area with wood patching material.

If deterioration is deeper than 1/8-inch, but less than half the depth of the member and/or less than 33-percent of the existing member is compromised/deteriorated, make epoxy repairs as recommended by epoxy manufacturer and as follows:

• Remove either with dry scraping or solvent-based chemical strippers all non-adhered, “alligatored” or heavily built-up paint down to sound paint and/or bare wood;

• Remove all paint, down to wood substrate, in the immediate vicinity of each repair;

• Ensure member to be repaired is clean and dry;

• Mix and use epoxy components in accordance with manufacturer’s instructions; for respective applications as consolidants, adhesives, and fillers. Add bulking agents (micro-balloons), in volumes not exceeding manufacturer's recommendations, to increase post-cure workability;

• After cure, dress repair to final shape, blending surface of repair to surface of original material without apparent joint.

Where deterioration is deeper than half the member and/or exceeds 33-percent of the existing member is compromised/deteriorated, provide Dutchman repairs or partial or full replace of existing member as approved by the COR, and as follows:

• Provide Dutchman repairs where wood is structurally compromised. Wood repairs will not be made for aesthetic purposes. Dutchman repairs shall provide continuous smooth surfaces matching planes and profiles of wood members being repaired. Dutchman shall match wood being repaired in species and cut. Grain pattern of Dutchman shall match grain pattern of wood into which it is inserted.

• Neatly cut out existing opening as required to provide a prismatic void. Create voids that will provide mechanical attachments as in dovetails to the greatest extent possible. The amount of wood removed should be minimized but the amount should include all deteriorated wood and extend just beyond damaged wood into sound substrate to prevent the spread of any fungus. Cut away area shall provide ample glue surface.

• Cut Dutchman to exactly fit void, with exposed portion matching original profile of woodwork and just slightly proud of original surface. Orient grain of Dutchman parallel to grain of element being patched.

• Where deterioration or loss at end of component requires Dutchman repair, use a diagonal scarf joint for end-to-end joint between Dutchman and remaining portion of component.

• Clean glue surfaces with acetone or denatured alcohol. Insert Dutchman using specified adhesive and clamp in place until glue is set. Where clamping is not feasible, use small brads; remove brads and fill holes after adhesive has set.

• Plane or scrape Dutchman to provide smooth continuous surface coplanar with adjacent wood. Do not damage or alter profile or finish of adjacent wood.

• After cure, dress repair to final shape, blending surface of repair to surface of original material without apparent joint.

If depth of deterioration is greater than half the thickness of the member or exceeds 33-percent of the entire member and the deterioration cannot be repaired utilizing a Dutchman or epoxy methods, the entire member shall be replaced:

• Carefully remove fasteners at deteriorated member.

• Remove deteriorated member, taking care not to damage adjacent members.

• Remove adhesive residue and fasteners from adjacent members.

• Fabricate new members to match existing size, thickness, shape, and length. Wood shall be same species with configurations, profiles, dimensions and joinery exactly matching those of the existing elements. Machine and surface all new replacement wood elements to provide smooth even surfaces without saw marks or plane marks. Wood with surface irregularities, including but not limited to scratches, saw marks, and plane knife marks, visible after finish has been applied will be rejected and shall be replaced with properly finished wood elements at no additional cost.

• Install hardware cloth behind replacement members. Replacement members shall be set square.

Profiles and exterior surfaces shall be flush with adjacent surfaces.

Replace previously-made dutchmen repairs on cornerboards to match standards defined above to ensure no visible seam in wood, members join tightly.

Install clapboards with exposure to match existing and as recommended by the Western Red Cedar Lumber Association. Use beaded clapboards where existing clapboards are beaded, and plain clapboards where existing clapboards are not beaded. Joints shall be feathered or square butted to match existing.

Each succeeding course shall overlap the upper edge of the previous one by a minimum of 1 inch. The bottom of the board that is placed across the top of windows shall coincide with the window cap.

Face nail clapboard siding to plank frame with sufficient penetration into solid wood to secure the siding using one nail per piece spaced at a maximum of 24 inches on center. Do not penetrate all the way through the plank wall construction and damage interior finishes. Place nail just above the overlap. Do not nail through the overlap of two pieces. Finished repairs shall match existing in materials, size, configuration and appearance.

Gutters and downspouts Remove downspouts, elbows and couplings in such a manner as to not damage existing items to remain.

Protect wood conductor heads and offset blocks for reuse.

Replicate offset blocks from pressure-treated wood if too deteriorated for reuse.

Install new downspouts and related components in same configuration as existing, reusing wood conductor heads and offset blocks. Prep and finish to match house exterior.

Clean all debris from gutter assemblies utilizing hand tools, light pressure water washing, and soft bristle brushing. Allow gutters to dry completely.

If mold is observed, utilize a bleach solution (1:3 bleach to water ratio) the scrub with a stiff brush and soapy water to loosen and remove any debris.

Verify actual extent of deteriorated gutters. Preserve all existing components in situ wherever possible.

Only as a last resort and only after approval by COR, replace damaged and rotted sections with new sound material according to the best practices of the industry. Finished repairs shall match existing in materials, size, configuration and appearance.

Install wood gutter sections to match existing with mitered returns, pitch minimum ¼”/10’ to downspouts. Seal end grain with epoxy consolidant prior to priming, painting, assembling, sealing, and flashing. Miter and rabbet joints and install recessed lead flashing, seal with caulking. Install gutter outlets. At the lower end, install a sloping piece of lead flashing to make the short length of gutter from the outlet to the low end drain back into the outlet.

Apply preservative oil to the interior surfaces of the wood gutter in accordance with the manufacturer’s written instructions and recommendations. Use applicators and techniques suited for oil and substrate.

Prep and finish exterior to match house exterior.

Ensure gutters are properly connected to downspouts for proper leak-free function and positive drainage.

Finishing requirement for new wood at repaired areas Sand work smooth and set exposed nails and screws.

Apply wood filler in exposed nail and screw indentations and sand smooth.

At exterior, all exposed end grain shall be soaked for a minimum of 2 hours in penetrating oil similar to gutter preservative oil prior to installation. Ensure that penetrating oil is compatible with finished coating.

Chimney flashing Flashings shall be fabricated and installed to lay flat, resist wind forces, expand and contract as required and present a neat workman like appearance. All new flashing shall replicate the character and details of the existing flashing. Furnish and install lead coated copper chimney flashings including, but not limited to, step, base, reglet and counter flashings.

Sheet metal flashings shall be as required to match the existing sheet metal systems. Refer to the publication, "Copper and Common Sense" by Revere Copper and Brass and all recommendations of the Sheet Metal and Air Conditioning Contractors National Association concerning methods and materials to be used in the fabrication and construction of sheet metal flashings.

Form and fabricate sheets, seams, strips, cleats, edge treatments, integral flashings, and other components of copper to profiles, patterns, and drainage arrangements shown and as required for permanently leak-proof construction.

It is the intent of this project to have as little soldering of copper as is practical in order to properly install strong, watertight metal flashings. Joints shall be interlocked and crimped where possible. Flanges which extend onto the roof surface shall always be soldered. All corners shall be soldered to provide strength and a waterproof connection. Conceal fasteners and expansion provisions where possible.

Comply with Military Specification MIL-S-6872B entitled, "General Specifications for Soldering Process" when forming soldered joint. Use conduction soldering methods. Areas to be joined shall be cleaned of all oil, grease, pencil marks, paint, dirt or other foreign substances. Remove all burrs using files, grinding stones or other methods. Hold parts in place using clamps, jigs and supports or by self-fixturing. If parts are tack-soldered to hold them in place, the area of tack-soldering shall be reworked into the final soldering. Parts cannot move during the soldering process.

Flux shall be applied to all surfaces that are to receive solder. Flux-cored solder should not be used. Flux shall be fluid when heated and effective in removing and excluding oxides and other impurities from the joint. Flux should be readily displaced by the molten solder.

Areas to be joined shall be heated above the liquidus temperature of the solder. To deliver maximum heat, the solder shall be applied to the joint and not the bit of the iron. Allow solder to flow in place to provide a minimum 1" final width of solder over the joint. Joint shall not be disturbed until it has been completely cooled. After soldering completely, remove all flux and acid by washing and scrubbing with a neutralizing agent.

Exposed masonry walls (behind and below counterflashings), and sheet metal flanges (both sides) shall be primed with water based asphaltic primer, prior to roofing or flashing installation. Apply primer by brush at a rate of 200 square feet per gallon with no bare spots. Allow primer to dry thoroughly prior to installing the flashings.

Edges of all sheets of uncoated copper to be soldered shall be tinned with solder on both sides for width not less than 1 ½“. All soldering shall be done slowly with well-heated coppers; heat sheet thoroughly and sweat copper completely through the full width of the seam. Ample solder shall be used and seam shall show at least one full inch of evenly flowed solder. Wherever possible all soldering shall be done in flat position.

Stepped Base Flashing: Form from separate pieces of lead coated copper concealed between each shingle course and extending 6’’ minimum outward onto the roof and 4’’ minimum up the chimney.

The upper edge of each stepped flashing should extend 3” above each course of shingles. The lower edge should be ½’’ above the shingles forming the next course. At chimney corners connect base flashing by a locked soldered seam.

Counterflashing: Clean out and chisel out 3/8’’ wide by 1’’ deep reglet groove. Insert counterflashing 9 - 10“ above roof decks, extend down vertical surfaces over upturned vertical leg of base flashings not less than 5“. Fold the exposed edges of counterflashings ½“. At stepped counterflashings, install in short lengths a minimum of 8“ by 10“. Provide end laps in counterflashings not less than 6’’ in the direction of water flow and render weathertight with plastic cement. Secure the flashings in the reglets with construction adhesive and lead wedges spaced at 8“ minimum; Tamp wedges in place tightly without spalling brick surfaces. Fill reglet joints with tooled mortar. Crimp clips to bottom of new reglet flashing.

Flashing at cellar entrance ell Install flashing at house walls according to best practices of the industry as required for permanently leak-proof construction.

Mortar repairs at brick foundation and chimney masonry mortar joints Preserve all existing brick wherever possible. Prior to repairs being made to masonry, assemble a mockup of repair work for NPS review and approval.

Hand tools shall be used for removal of mortar. Small hand-held power tools may be permitted if skillful handling and minimal damage to existing masonry units is demonstrated to the satisfaction of the COR.

Mortar joints that are in sound condition may remain undisturbed. All mortar joints that are friable or cracked shall be removed in preparation for repointing. Contractor shall exercise diligence to avoid abrading brick faces and to avoid chipping edges or otherwise widen joints at the brick arrises. Use chisels of constant rectangular cutting edge only.