Addendum Two.pdf

COMMONWEALTH OF KENTUCKY

DEPARTMENT FOR FACILITIES AND SUPPORT SERVICES

DIVISION OF ENGINEERING AND CONTRACT ADMINISTRATION

INVITATION TO BID NO: RFB-231-25

FOR: Roof Replacement

Kentucky Veteran Cemetary Department of Veteran Affairs Williamstown, Kentucky

DATE: June 18, 2025

RFB-785-2500000755

ADDENDUM NO. Two (2)

BIDDER SHALL CONFORM TO THE FOLLOWING CHANGES AS SAME SHALL BECOME BINDING

UPON THE CONTRACT TO BE ISSUED IN RESPONSE TO THIS INVITATION TO BID.

NOTE: THIS PROJECT IS BEING READVERTISED VIA ADDENDUM 2. ALL DOCUMENTS REMAIN

THE SAME WITH THE EXCEPTION OF THE INFORMATION POSTED IN THIS ADDENDUM.

Item No. 1: Revised official bid date is July 2, 2025. Bids are due at 1:30 PM, Eastern Time through the VSS System. All bids will be publicly read aloud at 2:30 P.M. Eastern Time on this date.

Item No. 2: Specification Change:

Delete Specification 073126 – SLATE SHINGLES from the project requirements Specification for Shingles shall be 073139 – SYNTHETIC SLATE SHINGLES, attached.

END OF ADDENDUM

Invitation to Bid No. RFB-231-25 For: Roof Replacement

Kentucky Veteran Cemetary Department of Veteran Affairs Williamstown, Kentucky

Susan Ward, Statewide Procurement Analyst II Division of Engineering and Contract Administration

KVA – KVCN Roof Replacement Phase C – Construction Documents Commonwealth of Kentucky Account Number 074-CBV3-NE02-00

SECTION 073139 PAGE 1 of 15

SECTION 073139 SYNTHETIC SLATE SHINGLES

PART 1 – GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of Contract, including General and Supplementary Conditions, and Division 0 and Division 1 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Provide all labor, equipment, materials and services required to perform the work of this Section as indicated on the Drawings and specified herein.

B. This Section includes, but is not limited to, the following:

1. Removal of existing slate shingles and installation of new synthetic slate shingles.

2. Installation of new underlayments.

3. Installation of new mitered hips.

4. Installation of new saddle ridges.

5. Such other Work as specified herein or shown in the Drawings.

C. Related Sections:

1. Section 061053 – Miscellaneous Rough Carpentry

2. Section 077253 – Snow Guards

3. Section 264113 – Lightning Protection for Structures

1.3 REFERENCES AND STANDARDS (p.15-17, 264-267)

A. Comply with applicable requirements of the most recent editions of the following standards and others referenced in this Section. Where these standards conflict with other specified requirements, the most restrictive requirements shall govern.

1. National Slate Association – Slate Roofs: Design and Installation Manual, 2010 Edition.

2. ASTM C406 – Standard Specification for Roofing Slate.

3. ASTM D226 – Standard Specification for Asphalt-Saturated Organic Felt Used in roofing and waterproofing.

4. ASTM D4869 – Standard Specification for Asphalt-Saturated Organic Felt Underlayment

Used in Steep Slope Roofing.

5. ASTM D1970 – Standard Specification for Self-Adhering Polymer Modified Bituminous

Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection.

6. ASTM E108 / UL 790 - Standard Test Methods for Fire Tests of Roof Coverings.

SECTION 073139 PAGE 2 of 15

7. ASTM E96 – Standard Test Methods for Water Vapor Transmission of Materials.

8. ASTM D3161 – Standard Test Method for Wind-Resistance of Steep Slope Roofing

Products.

9. D3462/D3462M - Standard Specification for Asphalt Shingles Made from Glass Felt and Surfaced with Mineral Granules.

1.4 SUBMITTALS

A. Submittals shall be made in accordance with Section 013300.

B. Product Data

1. Underlayment(s) and underlayment fasteners. Product data for the roof underlayment must include the ASTM Standard to which it complies.

2. Synthetic Slate shingles, flashings and fasteners.

C. Samples

1. Selection Samples: Two sets of color chips representing manufacturer's full range of available colors and surface textures.

2. Verification Samples: After selection, submit two samples representing actual product, color, and texture.

D. Shop drawings

1. Scaled drawings showing all shapes, sizes, and colors of synthetic slate for all patterns, designs, images, figures, numbers, and letters to be incorporated into the slate shingles, including information on method(s) of attachment.

1.5 QUALITY ASSURANCE

A. Work of this Section shall comply with applicable standards indicated or implied.

B. Provide products in each color from a single manufacturer and batch during the course of the Work for consistency of quality and appearance.

D. Roofing contractor shall have at least 10-years experience in the installation of roofing/repair of existing slate roofing and shall have successfully completed at least three slate or synthetic slate roofing projects within the past five years similar in scope and scale to the Project specified herein.

Foreman or superintendent shall have similar experience and shall provide full-time supervision of installers.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Ship shingles in bundles:

1. Collate in sequence of widths and colors as required for selected color blend.

2. Assemble bundles so that sorting at job site is not required.

SECTION 073139 PAGE 3 of 15

B. Deliver shingles to site in manufacturer's unopened, labeled bundles.

1. Verify quantities and condition upon delivery.

2. Remove damaged products from site.

C. Store products in protected environment, off ground, protected moisture, traffic, and construction activities.

D. Store shingles flat. Do not store on site for prolonged period.

E. Store products at temperature between 40 and 120 degrees F (4 degrees C and 49 degrees C).

F. Store and dispose of solvent-based materials, and materials used with solvent-based materials, in accordance with requirements of authorities having jurisdiction.

1.8 PROJECT/SITE CONDITIONS

A. Environmental Requirements:

1. Observe manufacturer’s temperature, humidity, and moisture limits.

2. Do not install products under environmental conditions outside manufacturer's absolute limits.

1.9 SEQUENCING/SCHEDULING

A. Schedule and execute work to prevent leaks and excessive traffic on completed roof sections.

Coordinate work of this Section with interfacing, adjoining, and related roofing work for proper sequencing of each installation.

B. Do not disrupt activities in occupied spaces.

C. At the discretion of the Owner, the project may not be completed in phases.

D. When multiple trades are accessing the same work area, coordinate the work sequence so as not to hinder the project schedule or detract from the quality of the work.

1.10 WARRANTY

A. Furnish manufacturer’s 50 years warranty against breakage and deterioration resulting in leaks under normal weather and use conditions.

B. Furnish installer's 2 years total roof system warranty against water penetration, including underlayment, flashings, trim, and other roof components.

1.11 EXTRA MATERIAL

A. Provide an additional one square of field slates, twenty pieces of starter slate, and thirty pieces of hip and ridge slates for Owner’s use in future roof maintenance.

B. Place extra material in storage in a location designated by the Owner.

PART 2 – PRODUCTS

2.1 SYNTHETIC SLATE SHINGLES

SECTION 073139 PAGE 4 of 15

A. MANUFACTURERS

a. DaVinci Roofscapes, LLC, 800-DAVINCI

b. EnviroSlate

c. Brava

d. EcoStar

B. MATERIALS

Performance Requirements:

1. Roof system: Manufactured synthetic shingles attached to structural substrate to form weather tight roof envelope with no measurable water penetration.

2. Method of attachments designed to adequately resist wind uplift for roof configuration and Project location.

3. Meet minimum uplift resistance of 186 PSF with 2:1 safety factor in accordance with

TAS 125.

C. Synthetic Slate Shingles:

1. Description: Lightweight, synthetic slate shingles with appearance, color, texture, and thickness of natural quarried slate.

2. Product: Single Width Slate by DaVinci Roofscapes, LLC.

3. Material: Engineered polymer formulated from 100 percent virgin plastic resins;

recycled materials not acceptable.

4. Performance characteristics:

a. Approvals:

1) Fire resistance rating: Class A, tested to ASTM E108.

2) Impact resistance rating: Class 4, tested to UL 2218.

3) Wind resistance rating: 110 MPH, tested to ASTM D3161/D3161M.

5. Profile:

a. Rectangular shape with exposed-to-view upper surface and edges textured to resemble quarried slate.

b. Underside formed with reinforcing ribs.

6. Size:

a. Thickness: 1/2 inch (13 mm) at butt end, 1/8 inch (6 mm) at top.

b. Length: 18 inches (457 mm).

c. Width: 12 inches (305 mm).

7. Starter shingle: 12 inches (305 mm) long x 12 inches (305 mm) wide.

8. Markings: Form shingles with markings on upper surface to indicate nailing locations and provide alignment guidelines for different exposure lengths.

9. Color:

a. Multiple colors comparable to quarried slate.

b. Provide internal ultraviolet stabilizers.

10. Shingle pattern:

a. Provide shingles factory blended in multiple colors and widths:

b. Blend: Custom to match existing

SECTION 073139 PAGE 5 of 15

2.3 UNDERLAYMENTS (p.54, 64-69)

A. Synthetic Underlayment: UV resistant synthetic polymer (polypropylene, polyolefin, or polyethylene) highly vapor permeable underlayment.

1. Physical Properties

a. Water Vapor Transmission: 15 perms, minimum, per ASTM E96, Method B

b. Liquid Water Transmission: Pass per ASTM D4869

c. Roof Assembly Fire Classification: Class A or Class B per UL 790 or ASTM E108

2. Products

a. “SlopeShield Plus Self-Adhered,” VaproShield LLC., Gig Harbor, WA 98335, (866)

731-7663

b. “Delta-FOXX,” Dorken Systems Inc., Beamsville, ON, Canada, (888) 4-DELTA-4

c. “Delta-VENT S,” Dorken Systems Inc., Beamsville, ON

3. Underlayment Accessories

a. Single sided tape: Tape compatible with chemistry of underlayment material installed, for use at penetrations through the underlayment and tears.

b. Double sided tape: Tape for use within horizontal and vertical seams of underlayment if it is to be used as an air barrier as well as a weather/water barrier

c. Sealant: Gun grade sealant for use at flashing penetrations in conjunction with single sided tape

d. Fasteners: Corrosion resistant, metal or plastic caps nails as recommended by the underlayment manufacturer.

B. Ice Dam Protection Membrane Self-Adhering Underlayment, high temperature, polyethylene faced for ice dam protection at eaves and where shown in the Detail Drawings: ASTM D 1970, minimum of 30 mils thick; slip-resistant, polyethylene-film or granule surfaced laminated to SBS-modified asphalt adhesive, with release-sheet backing; cold applied.

1. Products

a. “Grace Ice & Water Shield HT,” GCP Applied Technologies, Inc., Cambridge, MA

02140, (617) 876-1400 or (877) 423-6491

b. “WeatherLock G,” Owens Corning, Toledo, OH 43659, (800) 438-7465

2.4 ACCESSORIES

A. Slate hooks for slate repair work: For slates with a 3” headlap and measuring up to ¾” thick, 3” long, 10-gauge, solid copper, Type 304 stainless steel, or Type 304 stainless steel powder coated black or bronze with 3/8” hook or 3/4” hook.

1. Custom slate hooks for headlaps greater than 3” shall be same material as specified above, fabricated to required length. Consult vendors for availability.

B. Nail head covers (bibs) for slate repair work: 16 oz. or 20 oz. copper, Grade HOO (cold rolled), complying with ASTM B370, or lead coated copper complying with ASTM B101, Type 1, Class A.

Bibs shall measure 3” to 4” wide by 8” long. Snip bibs along their long sides to form barbs and/or bend to a slightly concave or S-shape prior to insertion to help prevent the bibs from sliding out.

C. Cants for starter course of slate shingles: Wood cants, standard 3/16”-1/4” thick plaster lath, tapered horse feather shims, or ripped rot-resistant lumber. Fabricate to height and width required to permit first and subsequent courses of slate to lie flat atop underlying courses.

1. Where shown in the Detail Drawings, brake inverted V-shaped cants directly into metal drip edge flashings and gutter liners located at the roof eaves. Fabricate cant to height required to permit first and subsequent courses of slate to lie flat atop underlying courses.

SECTION 073139 PAGE 6 of 15

C. Cants for starter course of slate shingles: Cants fabricated of PVC or synthetic wood trim boards or lattice strips. Fabricate to height and width required to permit first and subsequent courses of slate to lie flat atop underlying courses.

D. Wire used for hanging slates to avoid nailing thru underlying flashings: 99.99% pure copper wire conforming to ASTM B3, 0.051” diameter, minimum.

E. Sealant adhesive for use as adhesive dabs below hip and ridge slates: Exterior, non-sag, gun grade, single-component, sealant adhesive complying with ASTM C 920, Type S, Grade NS, Class 12.5, use group NT, I, M, and O, or Design Professional approved alternate sealant adhesive. Color shall be manufacturer’s standard color matching that of the slate as closely as possible.

F. Sealant for exposed nail heads (e.g., last ridge slate to be installed): Exterior, non-sag, gun grade, single-component, urethane sealant complying with ASTM C 920, Type S, Grade NS, Class 25, use group NT, M, A and O, or Design Professional approved alternate sealant. Color shall be manufacturer’s standard color matching that of the slate as closely as possible.

2.5 SNOW GUARDS

A.Flat-Mounted Snow Guard Pads: Plate with gusset, and pre-drilled holes, mechanically attached to roof deck.

1.Manufacturers and Products:

a.Basis of Design : Alpine SnowGuards. – Fusion Guard b.Berger Building Products.

c.Gough SnoGuards.

d.Levi's Building Components.

e.Rocky Mountain Snow Guards.

2.6 SLATER'S TOOLS

A. The following traditional slating tools shall be used for installation of the slate shingles:

1. Slate hammer for punching and nailing slate shingles.

2. Ripper for removing slate shingles.

3. Slate cutter or a slater’s stake and slate hammer for trimming and cutting slate shingles.

4. Steel punch or drill with masonry bit for forming holes in delicate or small pieces of slate.

B. Slates trimmed or cut on site shall have a bevel-edge similar to that produced at the quarry. Note that a grinder or saw shall not be used for cutting/trimming field slates as they will not produce a beveled edge similar to that produced at the quarry.

C. The use of nail guns for installing slate shingles shall not be permitted.

2.7 FLASHING:

1. Fabricate from sheet to profiles and dimensions indicated on Drawings

2. Material: galvanized steel thickness to meet KBC.

3. Linear components: Form in longest possible lengths, 8 feet (2.5 m) minimum.

4. Counterflashings: Extend minimum 4 inches (102 mm) up vertical surfaces and minimum 4 inches (102 mm) under shingles.

5. Valley flashings: Minimum 24 inches (610 mm) wide, extending minimum 10 inches

(254 mm) from valley center line.

6. Eave flashings: Fabricate with bottom edge formed outward 1/4 inch (6 mm) and hemmed to form drip.

SECTION 073139 PAGE 7 of 15

B. Fasteners:

1. 3/8 inch (9.5 mm) flat head nails, 1-1/2 inches (38 mm) long.

2. Material: Hot-dipped galvanized steel.

PART 3 – EXECUTION

3.1 GENERAL

A. Examine the roof deck and verify that it is satisfactory condition and ready to receive the new roof underlayment and slate shingle system.

1. Verify that the roof deck is well secured to the roof framing, free of warping or cupping, free of projecting fasteners, and the edges between boards plywood panels are flush.

2. Verify that the roof deck is clean, dry, and free of dew, frost, or other contaminants that might interfere with the laying or long-term durability of the slate roof system.

3. Report deficiencies in the roof deck to the Design Professional prior to commencing work.

3.2 REMOVAL OF EXISTING SLATE SHINGLES

A. Slate Roof Replacement - Disposal

1. Remove all slate shingles and associated underlayments down to the roof deck.

a. Pull/remove (do not drive-in) all slating nails and fasteners associated with existing underlayments.

b. Deck irregularities: Identify broken, warped, cracked, rotted, or otherwise deteriorated or irregular roof decking and framing that would make the substrate unsuitable as a substrate for new underlayments and new slate roofing, and report to the Design Professional.

c. During the course of the Work, protect from damage all roofing, flashings, rainwater conduction systems, and other building and site elements scheduled to remain.

Protect interior finishes and contents from moisture damage during the course of the Work.

d. Lower demolition debris to grade using enclosed chutes or other means. Plan method of removal from elevated heights. Remove in a controlled manner. Do not throw demolition debris off of the roof.

e. Clean work area and surrounding areas at grade to remove all slate chips, roofing nails, and other debris on a daily basis and at the end of project. The site shall be left clean.

f. Remove no more slate than can be reinstalled or made weathertight by the end of the day.

3.3 UNDERLAYMENT INSTALLATION

A. Verify that the roof deck is ready to accept the roof underlayment. Notify Design Professional in writing of any unsuitable conditions, such as voids, damage, or unsupported areas.

1. Mechanical fasteners used to secure the roof decking shall be set flush with the surface of the decking and fastened into solid blocking or framing members.

SECTION 073139 PAGE 8 of 15

2. All surfaces shall be clean, dry, and free of oil, grease, dirt, frost, dew, and other contaminants that could cause damage to the roof underlayment.

3. Decking shall be smooth, planar, continuous, and have adjacent edges set flush.

B. Ice Dam Protection Membrane: Install ice dam protection membrane at eaves, extending up slope at least 2 feet beyond interior side of exterior wall line, measured in a horizontal plane, or as indicated in the Detail Drawings.

1. Install ice dam protection membrane full length of valleys and in crickets as shown in the Detail Drawings, lapping bottom end on top of ice dam protection membrane installed at the roof eave.

2. Install ice dam protection membrane stripping along the top edge of metal gutter liners and crickets as shown in the Detail Drawings.

3. At vertical walls, dormer cheek walls, party walls, chimneys, etc., extend ice dam protection membrane up the vertical surface 4 inches, minimum, or as shown in the Detail Drawings.

a. See Paragraph C., below, for flashing of pipe penetrations.

4. Prior to installation of ice dam protection membrane, vacuum roof deck to remove all dust and debris. Install ice dam protection membrane directly to the roof deck in accordance with membrane manufacturer's instructions. Lap sides 3-1/2”, minimum, in direction to shed water. Lap ends 6” minimum. Roll all laps with roller.

a. Prime roof deck as recommended by the ice dam protection membrane manufacturer if good adhesion is not obtained and when temperatures fall below 50 degrees Fahrenheit.

5. Cover ice dam protection membrane with roof underlayment as outlined below.

C. Synthetic Underlayment

1. Install specified synthetic roof underlayment in accordance with manufacturer’s instructions.

a. Comply with manufacturer’s requirements regarding placement of underlayment over, or under, metal drip edge flashings at eaves and rakes.

b. Comply with manufacturer’s requirements regarding horizontal and end laps.

c. Comply with manufacturer’s minimum ambient temperature requirements for installation.

2. If exposed cap-nail installation method is used, all cap nails must be covered with specified single-sided tape. If concealed cap-nail installation method is used, all seams must be adhered using specified double-sided tape or adhesive sealant.

a. Install cap nails at spacing and in pattern specified by manufacturer.

b. Cover any punctures caused by fasteners associated with temporary strapping or staging with specified single-sided tape.

c. Turn roof underlayment up at vertical walls a minimum of 4”, unless otherwise shown in the Detail Drawings.

3. Flash penetrations through the roof using specified single-sided tape and/or manufacturer’s self-adhering membrane to provide for a secure and watertight assembly.

4. Cover roof underlayment with slate shingles as soon as possible, and in all cases within manufacturer’s maximum exposure window for the underlayment.

a. Limit foot traffic on this underlayment. Do not scuff the underlayment.

SECTION 073139 PAGE 9 of 15

D. Replace damaged roof underlayments immediately. Do not install slate shingles over damaged underlayment.

E. Upon completion roof underlayment shall be smooth and free of punctures, holes, gashes, wrinkles, deep scuffs, and other defects that could compromise the underlayment’s ability to serve as a temporary roof and secondary water shedding membrane.

3.4 SLATE INSTALLATION

A. Protection of Roof Surfaces

1. The roof is to be properly staged to allow safe work surfaces, such as brackets and planks, that prevent unnecessary foot traffic on the slates.

2. Where foot traffic is unavoidable, roof ladders, hook ladders, chicken ladders, foam pads, or other such devices shall be used to protect the slates.

3. Workers are to avoid walking on the slate surfaces during, and after, installation.

B. Laying Out the Roof

1. Check that the eave is straight and level, the ridge is parallel to the eave, and that the gable ends are square with the eave.

2. Snap a line for locating the starter course equal to the vertical dimension of the starter slate minus the specified overhang (1½”, or as otherwise shown on Detail Drawings). Set the starter course parallel to the eave. If the eave is not straight, make small adjustments in successive courses until the course lines are straight and parallel.

3. Chalk the line for the first course by measuring up from the eave the length of the slate, minus the specified overhang.

4. Chalk the line for the last full course at the ridge (finishing course), making sure it has an exposure of __”, or as shown in the Detail Drawings. Adjust the exposure of the courses approaching the ridge in small increments to obtain the required exposure of the finishing course (see subparagraph 5).

5. Snap horizontal lines based on the exposure of the slate, making small adjustments as needed so the courses end up parallel to the ridge and the exposure remains within ¼” of adjacent courses. When within 5 to 10 feet of the top of the slope, re-measure, and adjust the exposure in the remaining courses in small increments (1/8” to 1/4” per course) as needed for proper coursing. Do not reduce the headlap; always decrease the exposure so as to increase the headlap. (This same procedure applies to the laying out of courses at the bottom and top of dormers to assure that the courses line up.)

6. When laying out a roof with uniform width slates, snap two vertical lines near the center of the roof to establish the slate’s bond lines. The space between the two vertical lines should be equal to one-half the width of the slate. (p.59, Figure 2.28)

7. If the eave and/or ridge are not horizontal, establish a level line as a reference for snapping the course lines. Slate courses shall run horizontally. Treatment of special conditions shall be incorporated in the Test Panels under Paragraph 1.6, above.

C. Eave

SECTION 073139 PAGE 10 of 15

1. The starter course of slates shall be laid horizontally (with the long edge parallel to the roof eave) with the bevel-edged side facing down, and be canted to allow the starter slates to be tilted to the same angle as the field slates.

2. The starter slates shall have nail-holes 1” to 1½” down from the top, long edge of the slate, and approximately 1½” in from each short edge.

3. Eave slates shall be laid to provide the specified overhang (1½”), or as shown in Detail

Drawings) beyond the furthest extent of the fascia, cornice, crown molding, metal drip edge, trim, or other construction material at the eaves.

4. Slates at the eaves shall be doubled by first installing a slate starter course. The first course of slate shall be laid over the starter course so that the butt edges of both courses align. The first course of slate shall break side joints with the starter course side joints by not less than 3”. The second course of slates must overlap the starter course by at least the headlap of the field slates along the eaves.

D. Gable Ends

1. Rake edge (gable end) slates shall extend approximately 1” beyond the gable trim, fascia, or drip edge.

2. Adjust the width of field slate as needed to avoid gable end slate of less than 6” width.

E. Field Slates

1. Exposure and Headlap

a. All standard field slates shall be installed with a minimum 3" headlap when the roof slope is 8:12 up to 20:12.

a. All standard field slates shall be installed with a minimum 4" headlap when the roof slope is 4:12 up to 8:12.

a. All standard field slates shall be installed with a minimum 2" headlap when the roof slope is greater than 20:12.

2. Offset: Slate side joints shall be positioned as near the mid-point of the underlying slates as possible, and not less than 3" from the underlying joints.

3. Joint Spacing: Slates shall be laid nearly touching side-to-side, or with a gap of approximately 1/16” between slates (see Manual p.83, Note 3, and NSA Technical Bulletin #2). Small adjustments can be made in joint spacing and/or slate width as needed when approaching rakes or walls to avoid use of excessively narrow slates; no slate shall measure less than 6” in width.

4. Fastening – Nailing and Wiring

a. Secure each slate to the roof deck with two nails set in holes pre-punched or drilled at the quarry, or punched by hand on site.

b. Slates measuring ¾” or more in thickness and 20-inches or more in length, shall be secured with four nails each. Place the two additional nails approximately 2” above the regular nail holes.

c. Set each nail with the head set in the countersink left by the punching of the nail hole;

nails must not be over-driven, nor under-driven; nail heads shall touch the slate lightly, without producing strain on the slate and such that the slates hang from the nails.

d. Slates located adjacent to flashings shall be nailed to avoid puncturing the flashing material. Move one or both of the nails up, or closer to the center of the slate; secure the slate with a second nail placed one above the other on one side of the slate; or, SECTION 073139 PAGE 11 of 15 secure the slate with copper wire fastened to the roof deck upslope of the top edge of the flashing.

5. Shapes: The slate shape shall be rectangular

F. Valleys

1. Valleys shall be open.

a. Open Valleys

i. Slates at the edges of valleys shall be cut in neat and straight lines.

Ii. Valley slates are to be cut from the back of the slate to maintain a beveled slate edge.

iii. Clip the upper corner of valley slates to allow the slate to lay correctly and to direct moisture toward the valley centerline.

iv. For fabrication of valley flashing, see section 076200.

v. Lay slate a minimum of 3”-4” each side of the valley centerline. Taper outward

1/16” per foot from top to bottom to allow for release of ice.

vi. When fastening slates, do not puncture valley flashing with nails. Use wider slates as needed; place two nails, one above the other along the edge of the slate farthest from the valley centerline; or, hang slates from copper wire secured above the top edge of the valley flashing.

vii. Adjust width of slates approaching a valley to avoid the need to cut slate to a point at the valley; width of the butt of the valley slate shall be 3” minimum.

G. Penetrations

1. Slate shall be neatly fitted around pipes, ventilators, and other roof penetrations.

a. Do not nail through flashings.

b. Trim slates neatly.

c. See Section 076200 for flashings.

H. Flashings

1. Integrate flashings as slates are being installed.

a. See section 076200, Sheet Metal Flashing and Trim.

b. Flashing shall be installed where there are roof plane intersections, where the roof abuts walls, parapets, dormers and chimneys, at roof penetrations, and where shown on the Drawings.

c. See Slate Roofs: Design and Installation Manual, 2010 Edition for typical flashing installations not shown in the Detail Drawings.

I. Hip and Ridge Slates: See Paragraphs 3.5 and 3.6, below.

K. Coordinate slate installation with the installation of snow retention devices specified in Section

077253.

3.5 RIDGE SLATES (p.158-181)

A. Install ridge slates (finishing course slates) in a saddle pattern, laid horizontally, as shown in the

Detail Drawings and in accordance with approved test panels. Coordinate with installation of new copper ridge flashings and associated wood blocking.

1. Ensure roof underlayment is whole and overlaps the ridge a minimum of 12” in each direction.

B. Secure each ridge slate with 3 nails set approximately 1-1/2 inches down from the top edge of the slate.

SECTION 073139 PAGE 12 of 15

1. Nails holes in ridge slates may be drilled, instead of punched, in order to limit breakage and loss of section around the nail holes. Nail holes through underlying slate shingles shall be drilled, not punched.

C. Snap chalk lines to provide straight ridge lines. Accommodate lack of trueness in structural framing of ridges by selectively trimming slates or using slightly wider slates in localized areas as required to produce a line that is straight.

D. Lay ridge slates so as to accommodate the prevailing wind direction.

3.6 HIP SLATES

A. Install hip slates in a saddle hip pattern, as shown in the Detail Drawings and in accordance with approved test panels. Coordinate with installation of new copper hip flashings and associated wood blocking.

1. Ensure roof underlayment is whole and overlaps the hip a minimum of 6” to 12” in each direction.

B. Secure each hip slate with 3 or 4 nails arranged in a triangular or diamond pattern. In addition, set the bottom edge of each slate in dabs of specified adhesive.

1. Nails holes in hip slates may be drilled, instead of punched, in order to limit breakage and loss of section around the nail holes. Nail holes through underlying slate shingles shall be drilled, not punched.

C. Snap chalk lines to provide straight hip lines. Accommodate lack of trueness in structural framing of hips by selectively trimming slates or using slightly wider slates in localized areas as required to produce a line that is straight.

2. Slate Hook Method:

a. Install the slate hook prior to sliding the replacement slate into position.

b. Drive the slate hook into the roof deck through the joint between the slates in the course below with the hook aligned with the desired position of the butt of the replacement slate.

c. Slide the replacement slate up into position, past the hook, and then pull it back down to engage the butt end in the hook.

d. Do not use slate hooks when replacing multiple adjacent slates in the same course.

e. Do not use slate hooks for slates thicker than 3/4”.

f. Do not use standard slate hooks when the headlap is greater than 3” – custom slate hooks must be fabricated (see Part 2 of this Section).

3.8 SNOW GUARDS AND SNOW RAILS (p.239-240)

1. EXAMINATION

A.Verify that deck surfaces and roof openings are ready to receive Work of this Section.

2. PREPARATION

A. Apply protective coating on surfaces contacting metals.

B. Clean and prepare substrates for snow guards.

3. INSTALLATION

A. Set curbs in full contact with roof deck.

B. Anchor roof accessories to resist specified loads.

C. Touch up damaged factory-applied finishes.

4. INSTALLATION OF SNOW GUARDS

A. Install and space snow guards as recommended by manufacturer.

B. Flat-Mounted Snow Guards: Mechanically anchored to roof deck

5. CLEANING

SECTION 073139 PAGE 13 of 15

A. Cleaning: Remove soiling and stains.

B. Coordinate installation of new snow retention systems with installation of slate shingles.

1. See Roof Plan for required locations for new snow retention devices.

3.10 CLEAN-UP AND ADJUSTMENT

A. Work areas shall be left neat and clean at the end of each work day.

B. Remove debris from gutters and downspouts (if any) at the end of each work day and upon completion of the work to ensure unrestricted flow of water from the roof.

C. Upon completion of work, remove all roofing equipment, excess material, and debris from all roof surfaces and grounds.

D. While removing equipment, material, and debris from roof surfaces, inspect all work to ensure completeness, aesthetics, and undamaged workmanship. Broom clean slate shingles as roof jacks and planks (or other means of access) are being removed from the roof.

E. Dispose of debris in accordance with all local, state, and federal regulations or in the manner as stated elsewhere in the Contract Documents.

F. Remedy any incomplete work and replace any damaged, broken, poorly lying, or otherwise offending roofing slates using the repair methods specified in Paragraph 3.7, above.

G. Upon completion of clean up and adjustments, advise the Design Professional that the work is ready for final inspection and punch listing by the Design Professional.

END OF SECTION 073139