C - Work Specifications 073613.doc

SECTION 07313 WOOD SHINGLE ROOF

PART 1: GENERAL:

1‑1 DESCRIPTION:

The work of this section consists of furnishing all of the materials labor and equipment necessary for installing a wood shingle roof on the Icehouse, Pool Pavilion and Garden Shed at Grey Towers National Historic Site. The wood shingle roofs will be installed on open lath/skip sheathing as specified for the purpose of allowing the underside of the shingles to be well ventilated. Ice dam material will be used at the eaves as additional protection from ice dam, etc.

Lead Coated Copper Gutter repairs are mainly on the Mansion and consist of repairs to the half round gutters and all parts and pieces of the gutter system. Repairs not limited to the following Split Seams, broken hangers, outlets, downspouts, elbows, miters, end caps and strainers.

Baitbox gutter repairs consist of replacement or repairs to the aluminum gutters, leaders and leaf guards.

Electric Heating Cable on the Mansion, letterbox and baitbox will be removed and replaced with new electric heating Cable. This new cable will be installed to manufacturer specifications.

Sensitivity to the metal and slate roofs should be maintained at all times any damage that occurs will be repaired.

Inspection of 3 Chimney caps making sure there is a tight seal so that weather and pests primarily bats cannot enter into chimney flue.

1‑2 QUALITY ASSURANCE:

A.

Grading rules of the Cedar Shake and Shingle Bureau (CSSB) will be used in the purchase of the wood shingles.

B.

Installer Qualifications: Contractor shall provide evidence demonstrating, to the satisfaction of the Contracting Officer, his/her experience and competence in performing this type of work. Foreman running the job shall be journeymen with a minimum of five (5) years experience in roofing and general carpentry.

1‑3 SUBMITTALS:

A.

Material: A minimum of 10 days prior to the start of work the Contractor will provide representative samples to the COR (contracting officer’s representative) from all materials to be used during this project, i.e. shingles, lath, sheathing, flashing, nails. Samples must be of adequate size to fully display the functional characteristics and range of color, texture, and/or pattern. Purchases of materials or supplies made prior to approval by COR are performed by the contractor at his own risk.

B.

Approval: Contracting Officer shall indicate approval or disapproval of each submittal and reasons for disapproval. These submittals represent the standard to which all material will be graded and acceptance of the project will be based. Any and all work performed prior to approval or not meeting accepted standards will be at the Contractor's own risk and will be subject to removal.

1‑4 GUARANTEE:

Furnish a guarantee‑warranty in writing against a defective roofing system for not less than manufacturers warranty from date of acceptance. Guarantee‑warranty shall include repairing if necessary to maintain roof in a watertight condition.

PART 2: PRODUCTS:

2‑1 SHINGLES:

Certigrade No. 1 Blue Label “Perfections 18”, Red Cedar or Alaskan Yellow Cedar shingles. “Certigrade” is the industry standard for recognized quality. No. 1 Blue Label = 100% edge grain, 100% heartwood, and clear% cedar shingles. 5” exposure on all roofs will be maintained.

2-2 LUMBER:

A. No. 2 common pine boards or as otherwise indicated in the Scope of Work. New roof lath, “skip sheathing” (open spaced sheathing) shall equal existing in size and species unless otherwise indicated.

2‑3 NAILS:

C.

Hot‑dipped galvanized or zinc coated box nails. Use 4d ring shanked roofing nails in field of roof and 5d for hips, ridges, and starter course, use 8d for lath and sheathing. Pneumatic nailing or stapling will not be allowed.

2‑4 FLASHING AND VALLEY METAL:

Section 07600 or description of work.

2-5 SCREENING MATERIAL:

Tight Mesh Screening

PART 3: EXECUTION:

3-1 DEMOLITION OF EXISTING ROOFING MATERIALS:

A.

Tarp attic and grounds to protect all interior and exterior surfaces from damage.

B. Remove all existing roofing material down to original wood decking or open lath. Replace all deteriorated lath in-kind re-nailing the existing lath to secure wood to rafters if necessary. Report all defective or unforeseen conditions to the COR immediately before proceeding with the work.

C. Remove all nails (& other fasteners) from sheathing/roof deck.

D. After identifying deteriorated wood elements contact the COR to inspect and document. When approval to proceed has been received from COR, proceed to remove this material and plan for the necessary repairs.

3-2 TEMPORARY PROTECTION:

When decking or lath is to be totally removed from structures lacking a ridge board, work shall be restricted to one side of the roof at a time. Care shall be taken to not leave any portion of the roof exposed to the elements during construction. Special consideration should be taken in securing any temporary covering on the roof, during execution of the contract, for extreme weather conditions, overnight, weekend or any prolonged period between work.

3-3 ROOF DECK:

Open (spaced sheathing) Deck:

The proper roofing deck is as follows: Roofing lath (skip sheathing) are spaced at a distance, on center, equal to the exposure of the shingles (5 ½” in this case). The first three feet from the eave edge are to have solid sheathing with a combination of 8”, 10”, or 12” nominal sheathing lumber in the same thickness as existing sheathing. Stagger the end breaks on sheathing by two rafters when installed rows of boards. Roof lath will be installed at the intended exposure after the first three feet from eave is completed.

3‑4 SHINGLE NAILING:

Stapling is not permitted. Use two nails per shingle, located not over 3/4 inch from the edge of shingle at each side and 1‑1/4 inches above the butt line of the subsequent course. Verify that nails are just long enough to penetrate into sheathing but not protrude through. Drive nails flush to shingle surface, but do not sink the nail head into or beyond the shingle surface.

3‑5 LAYING SHINGLES ‑ GENERAL:

A.

Substrate: Lay shingles directly on wood lath. Use no felt underlay or interplay.

B.

Spacing: Space shingles 1/4 to 3/8 inch apart, side to side.

C.

Exposure: Match existing exposure (5 ½”).

D.

Single Width: Shingles will be no wider than 8 1/2" and not narrower than 3”.

E.

Lines: Lay shingle butts in straight lines across roof surface. Check distance to ridge frequently to assure straight lines are maintained. Do not measure row to row as errors are compounded. Assure shingle lines are perpendicular to slope.

F.

Side Lap: Stagger joints between subsequent courses at least 1‑1/2 inches. Avoid vertical joint alignment for three courses.

G.

Valley Shingles: Retain the widest shingles for use on valleys.

H.

Do not nail into valley flashing.

3‑6 TRIPLED FIRST COURSE:

At eaves, project first course to overhang approximately 1‑1/4 inches. (Adjust overhang slightly to insure drip line into gutter.) Make first course a triple layer of shingles with joints in all three layers staggered. First course will start with the top 2/3 portion (toward the tapered end) of the shingle.

3‑7 GABLE ENDS:

Project shingles about 1 inch over end rafter, barge board, or molding. Tilt edge shingles slightly away from gable edge by installing beveled siding strip or cant strip (with tapered edge facing inward) along rake on top of sheathing.

3-9 HIPS AND RIDGES:

A. Center an 8‑inch‑wide felt strip over sheathing at ridges and hips except where specified.

B. Ridge should match existing if not possible consult with COR and seek approval for installation method.

3-10 SLOPE TRANSITIONS:

A.

Install 15 pound roofing felt at breaks/transitions in the roof surface in order to prevent leaking caused by ice dam or snow build up on roof. This should be installed to lay beneath the rows of shingles which have their butt end on the top of the transition and on top of the course below, but should not be exposed. Crease & bend the upper edge to provide a lip on the upper edge to prevent the creep of water from ice dam over the uphill edge.

END

SECTION 06133 HISTORIC PRESERVATION CARPENTRY

PART 1: GENERAL:

1-1 DESCRIPTION:

The work of this section describes the material and workmanship required for performing preservation carpentry repair work on the Icehouse, Pool Pavilion and Garden Shed at Grey Towers National Historic Site.

1-2 QUALITY ASSURANCE:

A.

Standards: American Society for Testing and Materials (ASTM) and manufacturers printed recommendations. See Section 2-1.

B.

Installer Qualifications: Contractor shall provide evidence demonstrating, to the satisfaction of the Contracting Officer and / or the Contracting Officers Representative (hereafter COR), his/her experience and competence in performing this selective and exacting type of carpentry work. Foreman running the job shall be a journeyman carpenter with a minimum of five (5) years experience in historic preservation carpentry.

1-3 PROJECT/SITE CONDITIONS:

A.

Clean-up: At the close of work each day, and at the end of the project, remove all debris from the grounds and interior floors and place in a dumpster or other storage container.

B.

Storage of Materials: The Contractor is allowed to store materials on site at the discretion of the COR. All material stored must be kept in a clean and orderly condition. Take precautions to avoid fire or other hazards. The Government assumes no responsibility for loss or damage to the Contractor's equipment, tools, or supplies.

C.

Safety: The Contractor will take all measures to insure the work site is safe for all employees, Forest Service personnel, and the visiting public. All work shall conform to all Forest Service regulations and applicable standards of OCCUPATIONAL HEALTH AND SAFETY ADMINISTRATION (OSHA), and use recommendations of product manufacturers.

1-4 SUBMITTALS:

A.

A minimum of 10 days prior to start of work the Contractor will provide the COR with submittals of all material to be used during this project. Samples must be of adequate size to fully display the functional characteristics and range of color, texture, or pattern.

B.

COR will indicate approval or disapproval of each submittal and reasons for disapproval. These submittal represent the standard to which all material will be graded and acceptance of project will be based. Any and all work performed prior to approval, or not meeting the accepted standards, will be at the Contractor's own risk and will be subject to removal.

PART 2: MATERIALS

2-1 GENERAL:

A.

All material furnished shall match existing in dimension, color, and texture unless specified otherwise, excluding deterioration or damage.

B.

Historic building materials are not usually of the same dimensions as today's building material and may not be available commercially. The contractor may have to fabricate, or have fabricated, some or all of the material necessary for completion of the project.

2-2 FRAMING LUMBER:

A.

All material shall match existing in dimension, texture, and species unless specified otherwise.

B.

All material shall be stud grade or better and be expected to carry designed stress loads. Material will be free of all defects that will undermine the structural integrity including excessively large knots, through knots, cross grain, wind shakes, decay, and excessive splitting, checking, bowing, and/or cupping.

C.

The moisture content of all framing material should not exceed 19%.

2-3 EXTERIOR WOOD WORK AND SHEATHING:

A.

Material will match existing in shape, dimension, and species unless otherwise specified.

B.

Moisture content shall be 12% or less.

2-4 EXTERIOR MILLWORK:

A.

Material to match existing in shape, dimension, and species unless specified otherwise.

2-5 FASTENERS:

A.

Assure that all wood members are properly attached to the framing using the specified fasteners. (8p or 10p common hot dipped galvanized nails for sheathing to rafters depending on sheathing size) Secure both new and existing wood material with these fasteners prior to proceeding to utilizing this member for its function. (Properly nail skip sheathing to rafters prior to installing roofing material.)

B.

All exposed fasteners are to match existing in size, form, and finish. If the fasteners are “cut nails” one source would be:

Tremont Nail Company

P.O.Box 111

Wareham MA 02571

(800)842-0560

(508)295-0038

(508)295-1365 FAX

C.

All exterior fasteners will be hot dipped galvanized.

D.

Hidden or concealed fasteners may be modern fasteners, e.g. common wire nails, of proper size to rigidly secure material in place.

PART 3: EXECUTION:

3-1 GENERAL:

A.

All work will exhibit signs of being of the highest quality of workmanship through the selection of material and execution of craftsmanship.

B.

Mark all new material being installed with a date, and if desired the name of the installer if requested by COR. Marks to be made of permanent marker, paint, or “punch”, and should be inconspicuous so all not to detract from finish (i.e. concealed).

3-2 DEMOLITION OF HISTORIC MATERIALS:

A.

Carefully remove all deteriorated fabric so as not to destroy or disrupt surrounding sound material. Minimize disruption of sound material.

B.

Provide temporary bracing or secure structural members to protect the structure from further damage or deterioration during demolition and construction.

C.

Store salvaged fabric in a secure, dry area to avoid damage or deterioration of material.

E.

Protect the historic building after exposing the interior during demolition. Protect the interior of the building from moisture (rain, snow, etc), insects, vermin, and if necessary from entry by un-authorized personnel (non Forest Service employees).

3-3 FRAMING:

A.

Provide framing members of sizes, on-center spacing, and framed openings as specified or as found in existing work.

B.

Comply with "Manual for House Framing"-88 of the National Forest Products Association.

C.

Anchor and nailing schedule as specified and to comply with "Recommended Nailing Schedule" Table 1 of the "Manual for House Framing."

D.

Contact COR for inspection prior to completing work on areas that will be concealed from view.

3-5 EXTERIOR TRIM AND MILLWORK:

A.

Retain as much historic trim and millwork in place as practical. Historic woodwork is to be preserved where possible in lieu of replacement unless material requires removal due to condition.

B.

Replace deteriorated woodwork with new material that matches original in size, texture, and species. Assure woodwork is properly secured to framing by providing adequate nailing.

C.

If material will receive a painted finish, prime all replacement material on all sides prior to installation. Repair, patch, and caulk to insure uniform appearance and weather proofing.

D.

Use galvanized nails to fasten material.

SECTION 07600 FLASHING AND SHEET METAL

PART 1: GENERAL

1-1 DESCRIPTION:

The work of this section consists of flashing and sheet metal.

1-2 QUALITY ASSURANCE:

A.

Standards: All applicable standards of the American Society for Testing and Materials (ASTM), The NRCA Roofing and Waterproofing Manual produced by the National Roofing Contractors Association, and the Architectural Sheet Metal Manual by the Sheet Metal and Air conditioning Contractors National Association, Inc.

B.

Contractor Qualifications: Contractor shall provide evidence demonstrating, to the satisfaction of the Contracting Officer, his/her experience and competence in performing this type of work. Foreman running the job shall be a journeyman with a minimum of five (5) years experience in sheet metal fabrication and installation.

C.

GUARANTEE: Guarantee materials and workmanship for two years.

1-3 PROJECT/SITE CONDITIONS:

A.

Clean-up: All debris will be picked up on a daily basis. Refuse and construction debris to be stored in a cordoned off area or dumpster and will be removed prior to the completion of the project.

B.

Storage of Materials: All materials stored on site are to be kept clean and dry during delivery, storage, and handling. The Contractor will take all precautions to avoid fire and fire hazards. The government assumes no responsibility or liability for loss or damage to the Contractor's equipment, tools, or supplies.

C.

Safety: The Contractor will take all measures to insure the work site is safe for all employees, Forest Service personnel, and other visitors. All work shall conform to all applicable standards of the OCCUPATIONAL HEALTH AND SAFETY ADMINISTRATION (OSHA), and use recommendations of product manufacturers.

1-4 SUBMITTALS:

A.

Material: A minimum of 10 day prior to the start of work the Contractor will provide representative samples from all materials to be used during this project to the COR. Samples must be of adequate size to fully display the functional characteristics and range of color, texture, and/or pattern.

B.

Approval: Contracting Officer shall indicate approval or disapproval of each submittal and reasons for disapproval. These submittals represent the standard to which all material will graded and acceptance of project will be based. Any and all work performed prior to approval or not meeting accepted standards will be at the Contractor's own risk and will be subject to removal.

D.

Manufacturer's Literature: Sheet metal manufacturer's welding instructions, printed instructions, and recommendations for installation.

PART 2: MATERIALS:

2-1 SHEET METAL:

A.

Lead Coated Copper: ANSI/ASTM B370‑84a, cold rolled temper, weighing minimum of 16 ounces per square foot.

B. Zinc Strips to inhibit the Growth of algae and Moss.

2‑2 FASTENERS:

A.

Nails: FS FF‑N‑105B. Material, copper

2‑3 SOLDER: ASTM B32‑83, alloy grade 50A, 50 percent tin, 50 percent lead. A substitute can be submitted for approval but shall not be installed prior to approval in writing from the Contracting Officer.)

2‑4 SEALANT:

FS TT‑S‑227E, Type II, Class A, or FS TT‑S‑230A, Type II, or manufacturer's standard, one part polysulfide, silicone, or polyurethane type.

PART 3: EXECUTION

3‑1 INSTALLATION:

A.

General: Install work watertight, without waves, warps, buckles, fastening stresses, or distortion. Allow for expansion and contraction. Angle bottom edges of exposed vertical surfaces to form drips. Hem exposed edges.

B.

Soldering: Clean and flux metals before soldering. Sweat solder completely through seam width.

C.

Sealant Installation: Apply 1/4‑inch diameter bead, centered on full length of joint.

D.

Closed Valley Flashing: Minimum width, 24 inches. Extend flashing from 2 inches above top edge of base shingle to 1/2 inch above butt edge of covering shingle. Install flashing under each shingle course or as single sheet. Secure top edge to substrate with nails.

E.

Apron Flashing Where Roof Slopes Away From Vertical Surface: Extend up vertical surface 4 inches or to first brick joint, and onto roof surface 4 inches minimum. Secure top edge to wall sheathing. Hem bottom edge 1/2 inch. Lap seam of vertical joints 3 inches minimum and apply sealant, engaging hemmed edges. Miter and solder joints, and extend around corners 3 inches. Install bottom edge tight against roofing. Attach clips to substrate with concealed fasteners. Reinforce clips by double bending back over bottom edge of flashing. Counter flash top edge.

F.

Rake Flashing: Extend horizontal flange 3 inches under roofing. Nail to substrate. Extend vertical face over fascia. Lap seam joint in direction of water flow.

3-3 REPAIRING: Repair or replace damaged work when flashing is not functioning for installed purposes (protection from water infiltration to structure below).

3‑4 CLEANING:

As work progresses, neutralize excess flux with 5 to 10 percent washing soda solution and thoroughly rinse. Leave work clean and free of stains and debris.