A04 0040510889 20210115 Cooke Statement of Work.pdf

STATEMENT OF WORK

Roof and Chimney Repairs

CAPE COD NATIONAL SEASHORE

Cooke House, 245 Cliff Road, Wellfleet, MA

September 29, 2020

Scope This project is for repairs to roof and chimney of the Cooke house, including the following:

• remove and replace sheet metal chimney flashings including, but not limited to, step, base, reglet, counter, and apron flashings, install 24” of lead flashing around chimney (20” on roof, 4” cut into chimney);

• cut into chimney as needed to replace flashing;

• rake and repoint, and/or replace cracked or spalled brick masonry units at chimneys. Restore weep holes to functionality, if needed;

• remove and replace cricket to achieve proper pitch;

• strip back roof at bulging section next to chimney, replace damaged material and install all new material to match material required to be removed;

• strip back siding next to chimney under roof overhang, install lead and step flashing, install new siding;

• replace, reset and point base, counter, and apron flashings;

• seal and reapply finishes and chimney coating at repair areas;

• Install new chimney caps.

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.

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’s Representative (COR) between 8:00 a.m. and 4:00 p.m. on non-holiday weekdays. Telephone 508-957-0709. Email: john_defoe@nps.gov.

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

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. An equitable adjustment will be made in accordance with the Changes clause of the contract.

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, contractor shall supply 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, contractor shall provide temporary power at no additional cost to the contract for project use.

Permits and Approvals If ground disturbance is needed, 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.

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

Submittals and Deliverables Contractor shall submit fall protection and safety plan that complies with OSHA standards within 3 business days after award.

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 for approval 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 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.

Contractor shall take all necessary precautions to prevent fire during construction. Contractor shall 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 will conform to safety rules and regulations.

The Contractor is responsible for securing the site and his work. During the execution of this contract, the Contractor shall conform to the rules and regulations as set forth by OSHA Safety and Health Standards. The Contractor shall 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.

The Contractor shall 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.

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 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 contractor’s use of any space on the site in advance.

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. The contractor shall 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

1. Occupational Safety and Health Administration (OSHA)

2. National Institute for Occupational Safety and Health (NIOSH)

3. Massachusetts General Laws and Department of Environmental Protection regulations and statutes

4. Town Board of Health Regulations

Materials The contractor shall furnish, supply, and install all necessary materials to successfully complete the project requirements. Unless explicitly indicated, new materials shall match those being replaced in quality, appearance, size, materials, functionality and shape.

House-wrap siding underlayment for application over wall sheathing 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.

Wall sheathing Dimensional lumber wood to match existing species, shape and dimensions.

Pressure treated exterior grade plywood, thickness to match existing.

Trim Trim board materials, if needed, shall be STK grade red cedar, sizes and profiles to match existing, approximately 7/8” thickness.

Wood Finishes Caulking for joints or gaps around siding where water invasion may occur shall be Benjamin Moore Elastomeric 465 01 Caulk, or an approved equivalent.

Paint primers, sealers, and undercoats shall be suitable for the substrate and compatible with the finish coat and each other. Finish coat paint shall be semi-gloss enamel, color to be selected by COR from samples provided by contractor. Acceptable paint manufacturers include: Benjamin Moore & Co:

www.benjaminmoore.com., PPG Architectural Finishes, Inc: www.ppgaf.com., Sherwin-Williams Company: www.sherwin-williams.com.

Fasteners Fasteners shall be of a length sufficient to penetrate into the sheathing at least ¾”, stainless steel type 316 (not type 304) ring shank blunt tip nail with minimum 7/32" head. Likely length of fastener: 1 ½” to 1 ¾”” long.

Staples will only be allowed to install water-resistant barrier.

Sheet Metal, Flashing, Accessories 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.

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.

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.

Water based, quick drying, asphalt primer for metal flanges and brick masonry surfaces shall conform to ASTM D276, D562, D3278, and D3960.

Chimney Wherever possible, existing bricks from the chimney 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.

Mortar for chimney 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.

Water shall be potable and free from deleterious amounts of acid, alkali or other materials.

Roofing Wood framing and decking shall be pressure treated exterior grade dimensional lumber and plywood, intended for the purpose. Sizes and thickness to match existing.

Roofing underlayment shall be a membrane composed of two waterproofing materials—a rubberized asphalt adhesive backed by a layer of slip resistant coated high density cross laminated polyethylene film. As an advisory to the contract, Grace Ice and Water Shield meets the above-listed criteria.

Shingles shall be manufacturer’s “Premium” grade “Architectural” two-piece laminated fiberglass-based construction to match existing in quality, appearance, size, materials, functionality and shape, and conform to ASTM D 3018 Type I – Self-Sealing; UL Certification of ASTM D 3462, ASTM D 3161/UL997 80-mph Wind Resistance and UL Class A Fire Resistance; glass fiber mat base; ceramically colored/UV resistant mineral service granules across entire face of the shingle; two-piece laminated shingle, algae-resistant. Weight: 300 pounds per square (100 square feet) (14.6 kg/sq m). Color: As selected by NPS from manufacturer’s standards.

Shingles shall be warranted to resist blow-off due to wind velocities, including gusts, up to a maximum of 130 miles per hour during the first fifteen (15) years. The corresponding hip and ridge accessory products shall be installed per manufacturer’s direction as cap shingles, and starter shingles shall be installed per manufacturer’s direction along the roof eaves and rakes to ensure validity of this warranty.

Roof nails shall be stainless steel Type 316 ASTM A 153 Class D (1.0 oz/ft). Staples will not be allowed for this project.

Chimney Cap Single wall single flue adjustable bolt-on stainless steel 24 gauge hood and base with built-in screening, 1” inner lip, ¾” oval hole mesh 8” high screen with extra wide base to accommodate uneven flue heights sized to fit each flue with stainless steel hardware and lifetime warranty. As an advisory to the contract, the Forever Cap as supplied by Lowes meets the requirements of this contract.

Installation Preparation Remove siding, roofing, cricket and flashings at affected areas. Remove deteriorated materials back to sound material.

Chimney Work All masonry work should be completed prior to flashing work. Repointing and re-building work shall be performed only when air temperatures are expected to remain above 40° Fahrenheit during the work and for a period of at least 7 days upon completion of the work. Cold weather work will not be permitted.

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.

Reopen weep holes if necessary.

Remove old counter flashings and mortar to a depth of 2½ times the thickness of the joint or ¾ “, whichever is greater. Joints requiring installation of counter flashings shall be fully cleaned out to a 2” depth to provide a reglet for flashing. Coordinate locations for counter-flashings with flashing installation.

Remove mortar from both surfaces of the adjacent masonry units and square out at the back of the joint. Remove all loose, friable mortar, to reach sound existing mortar.

Thoroughly rinse raked joints with water to remove fine particles.

Apply mortar in layers not exceeding 3/8 “ in depth. Apply each layer fully compacted into the joint and allow to become thumbprint hard prior to the application of the next layer. Tool final layer of mortar after it has become thumbprint hard.

Remove spalled, eroded and cracked brick and replace with new. Remove and salvage loose bricks for reinstallation. Install new or replaced bricks. Tool the joints to a profile matching the adjacent brick masonry mortar joints.

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.

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.

Separate dissimilar metals by painting each metal surface in area of contact with a bituminous coating, by applying rubberized asphalt underlayment to each metal surface, or by other permanent separation as recommended by manufacturer’s or dissimilar metals.

Exposed masonry walls (behind and below counterflashing), 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 counterflashing ½“. At stepped counterflashing, install in short lengths a minimum of 8“ by 10“. Provide end laps in counterflashing 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.

Apron flashing: Extend over new shingles not less than 24“ with a ½’’ hemmed edge and extend up the chimney face at least 6 “. Apron flashing shall be soldered to the base flashings vertically and horizontally. Wrap apron flashing at corners a minimum of 4 “. For lead flashing in corner (4” reveal, 4” behind sidewall) of chimney and sidewall below overhang, install so lead runs above roof and under lead apron on roof above. Cut into chimney and secure behind sidewall.

Roofing Open up bulging area to expose deterioration. Remove existing roofing and rotten framing members, key in repairs where needed, reinforce as needed. Where structural members are not salvageable, carefully excise rotten sections of roof rafters. Replace rotten wood with dutchmen repairs. Replace damaged or deteriorated wood decking encountered with like material. 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 will span at least one truss width.

As necessary, install flashing, roof boots and drip edge.

Install self-adhered roofing underlayment.

Install roofing shingles in accordance with manufacturer’s instructions for product type and application specified, including layout and nailing pattern.

Siding Install new siding on house where removed.

Finishes Apply one coat primer and two coats paint to new siding, color to be selected by COR from samples supplied by contractor.

Chimney caps Install individual caps on each flue according to manufacturer’s guidance.

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.

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

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.

Storage of Equipment and Materials Contractor shall be responsible for storage of all materials and equipment; the Park COR and / or Project Inspector must approve contractor’s use of any space on the site in advance.

Upon completion of the work of this contract, the storage area shall be left broom clean by contractor.

Clean-Up After completion of the work, construction debris, excess material and equipment shall be removed from the site and legally disposed. Contractor to use a magnet of sufficient strength to ensure no metal is left behind. Upon completion of the work of this contract, work areas shall be left broom clean by contractor.

Period of Performance Preconstruction meeting – Will be held within one week of contract award.

Notice to Proceed – Will be provided to Contractor after preconstruction meeting and upon receipt of all required documents.

Material Submittals – Due within 48 hours (or 2 business days) of Notice to Proceed Proposed completed work with all documentation submittals – 21 days after date on the Notice to Proceed.

Map of Project Location

Cooke House

O ce an V ie w

D riv e

Pilgrim Rd.