Repair Pemberton Headquarters Roof_Addendum Two_4.26.21_0002.pdf

Repair Pemberton Headquarters Roof PAGE 1 of 1

ADDENDUM TWO

ADDENDUM NUMBER TWO

PROJECT:

Repair Pemberton Headquarters Roof, Front Porch and Exterior PMIS: 219142

SITE

1080 Crawford Street Vicksburg, Warren County, Mississippi

OWNER

NPS Interior Regions 1, 2, and 4 West MABO Atlanta Federal Center 1924 Building 100 Alabama Street SW Atlanta Georgia 30303

DESIGNER

Henry H. Lafferty, AIA Joseph K. Oppermann – Architect, P. A.

539 North Trade St.

Winston-Salem, NC 27101

(336) 721-1711

The following is intended to clarify and/or modify the Specifications and Drawings, for the project dated March 18, 2021 entitled: Repair Pemberton Headquarters Roof, Front Porch and Exterior.

I. PRIOR ADDENDA

A. Addendum Number One

II. PROJECT MANUAL/SPECIFICATIONS

A. Section 01 21 00 - Allowances: Replace B. Section 01 22 00 – Unit Prices: ReplaceSection 01 22 00 – Unit Prices: Replace C. Section 07 31 26 – Slate Shingles: Replace D. Section 07 57 10 – Canvas Decking and Deck Coating: Replace

III. Contract Price Schedule A. Contract Price Schedule: Replace

IV. Drawings A. Architectural Sketch 1 (SKA-1): Added

Included:

Addendum Number One, Replacement Specifications and Contract Price Schedule listed above, added Architectural Sketch listed above.

END – ADDENDUM TWO

GENERAL PEMBERTON’S HEADQUARTERS VICKSBURG, MS

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ALLOWANCES

SECTION 012100 - ALLOWANCES

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and other Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section includes administrative and procedural requirements governing allowances.

B. Types of allowances include the following:

1. Quantity allowances.

C. Related Requirements:

1. Section 012200 "Unit Prices" for procedures for using unit prices, including adjustment of quantity allowances when applicable.

2. Section 012601 "Contract Modification Procedures" for procedures for submitting and handling Change Orders.

1.3 DEFINITIONS

A. Allowance: A quantity of work or dollar amount included in the Contract, established in lieu of additional requirements, used to defer selection of actual materials and equipment to a later date when direction will be provided to Contractor. If necessary, additional requirements will be issued by Change Order.

1.4 ACTION SUBMITTALS

A. Submit proposals for purchase of products or systems included in allowances in the form specified for Change Orders.

1.5 INFORMATIONAL SUBMITTALS

A. Submit invoices or delivery slips to show actual quantities of materials delivered to the site for use in fulfillment of each allowance.

B. Submit time sheets and other documentation to show labor time and cost for installation of allowance items that include installation as part of the allowance.

C. Coordinate and process submittals for allowance items in same manner as for other portions of the Work.

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ALLOWANCES

1.6 QUANTITY ALLOWANCES

A. Allowance shall include cost to Contractor of specific products and materials ordered by Contracting Officer or selected by Contracting Officer under allowance and shall include taxes, freight, and delivery to Project site.

B. Unless otherwise indicated, Contractor's costs for receiving and handling at Project site, labor, installation, overhead and profit, and similar costs related to products and materials ordered by Contracting Officer or selected by Contracting Officer under allowance shall be included as part of the Contract Sum and not part of the allowance.

C. Unused Materials: Return unused materials purchased under an allowance to manufacturer or supplier for credit to Contracting Officer, after installation has been completed and accepted.

1. If requested by Contracting Officer, retain and prepare unused material for storage by Contracting Officer. Deliver unused material to Contracting Officer's storage space as directed.

1.7 ADJUSTMENT OF ALLOWANCES

A. Allowance Adjustment: To adjust allowance amounts, prepare a Change Order proposal based on the difference between purchase amount and the allowance, multiplied by final measurement of work-in-place where applicable. If applicable, include reasonable allowances for cutting losses, tolerances, mixing wastes, normal product imperfections, required maintenance materials, and similar margins.

1. Include installation costs in purchase amount only where indicated as part of the allowance.

2. If requested, prepare explanation and documentation to substantiate distribution of overhead costs and other markups.

3. The base bid will be adjusted by an Add or a Deduct to reflect actual quantities used.

B. Submit claims for increased costs due to a change in the scope or nature of the allowance described in the Contract Documents, whether for the purchase order amount or Contractor's handling, labor, installation, overhead, and profit.

PART 2 - PRODUCTS (Not Used)

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine products covered by an allowance promptly on delivery for damage or defects. Return damaged or defective products to manufacturer for replacement.

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ALLOWANCES

3.2 PREPARATION

A. Coordinate materials and their installation for each allowance with related materials and installations to ensure that each allowance item is completely integrated and interfaced with related work.

3.3 SCHEDULE OF ALLOWANCES

A. Allowance No. 1 – Repairs to Wood Using Wood Consolidant: Quantity Allowance:

1. Include the following quantities to make Repairs to Wood Using Wood Consolidant, as specified in Section 060312 “Historic Wood Repair” and as shown on Drawings.

Repair Using Wood Consolidant.

Unit of Measure = Each Repair of 24 Square Inches per repair.

Ex.: A repair 2 inches wide x 12 inches in length (24 S.I.) would count as 1 unit.

A repair 3 inches wide x 16 inches in length (48 S.I.) would count as 2 units.

a. 30 Repairs to Wood using Wood Consolidant

2. This allowance includes material cost, receiving, handling, and installation and Contractor overhead and profit.

3. Coordinate quantity allowance adjustment with corresponding unit-price requirements in Section 012200 "Unit Prices."

B. Allowance No. 2 – Wood Replacement (Dutchman): Quantity Allowance:

1. Include the following quantities to make Wood Replacement (dutchman) Repairs as specified in Section 060312 “Historic Wood Repair” and as shown on Drawings.

a. Cornice Molding Type 'A' 20 L.F.

b. Frieze Molding Type 'B' 15 L.F.

c. Architrave Molding Type 'C’ 15 L.F.

d. Balustrade - Upper Rail 5 L.F.

e. Balustrade - Lower Rail 5 L.F.

f. Baluster 4 L.F.

g. Column Post 16 L.F.

h. Column Wrap 30 L.F.

i. Perimeter Beam Wrap At

Second Floor Ceiling 10 L.F.

j. Soffitt 30 L.F.

k. Fascia 15 L.F.

2. This allowance includes material cost, receiving, handling, and installation and Contractor overhead and profit.

3. Coordinate quantity allowance adjustment with corresponding unit-price requirements in Section 012200 "Unit Prices."

C. Allowance No. 3 – Wood Replacement (Full Replacement): Quantity Allowance:

1. Include the following quantities to make Wood Replacement (Full Replacement) Repairs as specified in Section 060312 “Historic Wood Repair” and as shown on Drawings.

a. Cornice Molding Type 'A' 10 L.F.

b. Frieze Molding Type 'B' 10 L.F.

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ALLOWANCES

c. Architrave Molding Type 'C' 10 L.F.

d. Balustrade - Upper Rail 5 L.F.

e. Balustrade - Lower Rail 5 L.F.

f. Baluster 5 Ea.

g. Column Post 9 L.F.

h. Column Wrap 160 L.F.

i. Dentils 70 EA.

2. This allowance includes material cost, receiving, handling, and installation and Contractor overhead and profit.

D. Allowance No. 4 – Wood Porch Ceiling Replacement: Quantity Allowance:

1. Include the following quantities to make Wood Replacement (Full Replacement) Repairs as specified in Section 060312 “Historic Wood Repair” and as shown on Drawings.

a. Replace wood porch ceiling 15 S.F.

E. Allowance No. 5 – Wood Roof Deck Replacement: Quantity Allowance:

1. Include the following quantities to make Wood Replacement (Full Replacement) Repairs as specified in Section 060312 “Historic Wood Repair” and as shown on Drawings.

a. Replace wood roof deck 50 S.F.

F. Allowance No. 6 – Existing Terne Metal Roof Repair: Quantity Allowance:

1. Include the following quantities to make repairs to the existing terne metal roof as specified in Section 076100 “Sheet Metal Roofing,” Section 076200 “Sheet Metal Flashing and Trim,” Section 079200 “Joint Sealants,” and as shown on Drawings.

a. Replace metal roof panels 10 EA.

b. Replace Flashing 16 L.F.

c. Repair open seams 100 L.F.

G. Coordinate quantity allowance adjustment with corresponding unit-price requirements in Section 012200 "Unit Prices."

END OF SECTION 012100

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UNIT PRICES

SECTION 012200 - UNIT PRICES

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and other Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section includes administrative and procedural requirements for unit prices.

B. Related Requirements:

1. Section 012100 "Allowances" for procedures for using unit prices to adjust quantity allowances.

2. Section 012601 "Contract Modification Procedures" for procedures for submitting and handling Change Orders.

1.3 DEFINITIONS

A. Unit price is an amount incorporated into the Agreement, applicable during the duration of the Work as a price per unit of measurement for materials, equipment, or services, or a portion of the Work, added to or deducted from the Contract Sum by appropriate modification, if the scope of Work or estimated quantities of Work required by the Contract Documents are increased or decreased.

1.4 PROCEDURES

A. Unit prices include all necessary material, plus cost for delivery, installation, insurance, applicable taxes, overhead, and profit.

B. Measurement and Payment: The Base Bid shall be based upon the stated Allowance Amounts.

The contract will be adjusted with an “Add” or “Deduct” to the Base Bid Contract Amount using the Unit Prices and the actual quantities used. To adjust allowance amounts, prepare a Change Order proposal based on the difference between purchase amount and the allowance, multiplied by final measurement of work-in-place where applicable.

1. The base bid will be adjusted by an Add or a Deduct to reflect actual quantities used.

C. The Contracting Officer reserves the right to reject Contractor's measurement of work-in-place that involves use of established unit prices and to have this work measured, at Contracting Officer's expense, by an independent surveyor acceptable to Contractor.

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UNIT PRICES

D. List of Unit Prices: A schedule of unit prices is included in Part 3. Specification Sections referenced in the Part 3 "Schedule of Unit Prices" Article contain requirements for materials described under each unit price.

PART 2 - PRODUCTS (Not Used)

PART 3 - EXECUTION

3.1 SCHEDULE OF UNIT PRICES

A. Unit Price No. 1 – Repairs to Wood Using Wood Consolidant:

1. Description: Unit Price to make repairs to wood using wood consolidant in accordance with Section 060312 “Historic Wood Repair."

2. Unit of Measure = Each Repair of 24 Square Inches per repair.

3. Quantity Allowance: Coordinate unit price with allowance adjustment requirements in

Section 012100 "Allowances."

B. Unit Price No. 2 – Wood Replacement (Dutchman): Quantity Allowance:

1. Description: Unit Price to make Wood Replacement (dutchman) Repairs as specified in

Section 060312 “Historic Wood Repair” and as shown on Drawings.

2. Unit of Measure – As noted below:

a. Cornice Molding Type 'A' 20 L.F.

b. Frieze Molding Type 'B' 15 L.F.

c. Architrave Molding Type 'C’ 15 L.F.

d. Balustrade - Upper Rail 5 L.F.

e. Balustrade - Lower Rail 5 L.F.

f. Baluster 4 L.F.

g. Column Post 16 L.F.

h. Column Wrap 30 L.F.

i. Perimeter Beam Wrap At

Second Floor Ceiling 10 L.F

j. Soffitt30 L.F.

k. Fascia 15 L.F

3. Quantity Allowance: Coordinate unit price with allowance adjustment requirements in Section 012100 "Allowances."

C. Unit Price No. 3 – Wood Replacement (Full Replacement): Quantity Allowance:

1. Description: Unit Price to make Wood Replacement (Full Replacement) Repairs as specified in Section 060312 “Historic Wood Repair” and as shown on Drawings.

2. Unit of Measure – As noted below:

a. Cornice Molding Type 'A' 10 L.F.

b. Frieze Molding Type 'B' 10 L.F.

c. Architrave Molding Type 'C' 10 L.F.

d. Balustrade - Upper Rail5 L.F.

e. Balustrade - Lower Rail 5 L.F.

f. Baluster 5 Ea.

g. Column Post 9 L.F.

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UNIT PRICES

h. Column Wrap 160 L.F.

i. Dentils 70 EA.

D. Quantity Allowance: Coordinate unit price with allowance adjustment requirements in Section 012100 "Allowances."

E. Unit Price No. 4 – Wood Porch Ceiling Replacement: Quantity Allowance:

1. Description: Unit Price to repair roof deck as specified in Section 061000 “Rough

Carpentry” and as shown on Drawings.

2. Unit of Measure – Per Square Foot (S.F.)

F. Unit Price No. 5 – Wood Roof Deck Replacement: Quantity Allowance:

1. Description: Unit Price to repair roof deck as specified in Section 061000 “Rough

Carpentry” and as shown on Drawings.

2. Unit of Measure – Per Square Foot (S.F.)

G. Unit Price No. 6 – Existing Terne Metal Roof Repair: Quantity Allowance:

1. Description: Unit Price to make repairs to the existing terne metal roof as specified in

Section 076100 “Sheet Metal Roofing,” Section 076200 “Sheet Metal Flashing and Trim,” Section 079200 “Joint Sealants,” and as shown on Drawings.

2. Unit of Measure – As noted below:

a. Replace Metal Roof Panels 10 EA.

b. Replace Flashing 16 L.F.

c. Repair Open Seams 100 L.F.

END OF SECTION 012200

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SLATE SHINGLES

SECTION 073126 - SLATE SHINGLES

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Slate shingles.

2. Underlayment materials.

3. Ridge accessories.

4. Metal flashing and trim.

5. Fall Protection.

B. Related Requirements:

1. See Section 061000 “Rough Carpentry”

2. See Section 070150.19 “Preparation for Reroofing”

3. See Section 076200 “Sheet Metal Flashing and Trim”

1.3 DEFINITIONS

A. Roofing Terminology: See ASTM D1079 for definitions of terms related to roofing Work in this Section.

1.4 PREINSTALLATION MEETINGS

A. Preinstallation Conference: Conduct conference at Project site.

1. Participation by the roofing sub-contractor and crew chief is mandatory.

2. The meeting will be conducted by a representative designated by the Contracting Officer.

1.5 ACTION SUBMITTALS

A. Product Data: For the following:

1. Slate shingles.

2. Underlayment materials.

3. Ridge accessories.

4. Roof Tie-off Fall Protection

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5. Asphalt roofing cement.

6. Butyl sealant.

7. Elastomeric sealant.

8. Roofing asphalt.

9. Cold-applied adhesive.

B. Shop Drawings: For metal flashing and trim.

C. Samples: For each exposed product and for each color and texture specified, in sizes indicated.

1. Slate Shingles: Full size, of each color, size, texture, and shape. Samples of each slate shingle to include photographic evidence of its weathered color.

2. Metal Valley Flashing: 12 inches (305 mm) square.

D. Samples for Initial Selection:

1. For each type of slate shingle.

2. For each type of accessory involving color selection.

E. Samples for Verification: For the following products, in sizes indicated:

1. Slate Shingle: Full size, of each color, size, texture, and shape.

2. Metal Valley Flashing: 12 inches (305 mm) square.

1.6 INFORMATIONAL SUBMITTALS

A. Material Test Reports: For each slate variety, by a qualified testing agency.

B. Research Reports: From an agency acceptable to authorities having jurisdiction, indicating that product is suitable for intended use under applicable building codes for the following:

1. Polymer-modified bitumen sheet underlayment.

1.7 MAINTENANCE MATERIAL SUBMITTALS

A. Furnish extra materials that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

1. Slate Shingles: 64 sq. ft. (9.3 sq. m) of each size, type, and color, in unbroken bundles.

1.8 QUALITY ASSURANCE

A. Mockups: Build mockups to verify selections made under Sample submittals, to demonstrate aesthetic effects, and to set quality standards for materials and execution.

1. Build mockups for slate shingles including related roofing materials.

a. Size: 48 inches (1219 mm) long by 48 inches (1219 mm) wide.

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b. Include gutter and downspout complying with requirements in Section 076200 "Sheet Metal Flashing and Trim."

2. Approval of mockups does not constitute approval of deviations from the Contract Documents contained in mockups unless Contracting Officer specifically approves such deviations in writing.

3. Subject to compliance with requirements, approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion.

1.9 DELIVERY, STORAGE, AND HANDLING

A. Store underlayment rolls in a dry, well-ventilated location protected from weather, sunlight, and moisture in accordance with manufacturer's written instructions.

1. Store on end, on pallets or other raised surfaces.

2. Do not double-stack rolls.

B. Protect unused underlayment from weather, sunlight, and moisture when left overnight or when roofing work is not in progress.

C. Handle, store, and place roofing materials in a manner to prevent damage to roof deck or structural supporting members.

1.10 FIELD CONDITIONS

A. Environmental Limitations: Proceed with installation only when existing and forecasted weather conditions permit product installation and related Work to be performed in accordance with manufacturer's written instructions and warranty requirements.

1. Install self-adhering, polymer-modified bitumen sheet underlayment within the range of ambient and substrate temperatures recommended in writing by manufacturer.

1.11 WARRANTY

A. Roofing Installer's Warranty: On warranty form at end of this Section, signed by Installer, in which Installer agrees to repair or replace components of slate-shingle roofing that fail in materials or workmanship within specified warranty period.

1. Warranty Period: Five years from date of Substantial Completion.

B. Manufacturer’s Limited Warranty: Provide warranty and certification from the manufacturer that the slate installed has a service life in excess of 75 years as indicated by an ASTM C406 S1 rating, where the service life is defined as a period of time over which the slate will require no repair of replacement due to delamination resulting from freeze/thaw cycles and/or erosion of surfaces caused by excessive weathering. In the event that the installed slated does not give a service life of at least 75 years due to delamination resulting from freeze/thaw cycles and/or erosion of surfaces caused by excessive weathering, new replacement slate for the replacement

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of deteriorate slate shall be provided by the slate manufacturer at no cost to the owner for either material or shipping costs.

1. Warranty period: Seventy-five years from date of substantial completion.

PART 2 - PRODUCTS

2.1 SOURCE LIMITATIONS

A. Obtain each type of product from single source from single manufacturer.

2.2 PERFORMANCE REQUIREMENTS

A. Exterior Fire-Test Exposure: Provide slate shingles and related roofing materials identical to those of assemblies tested for Class A fire resistance in accordance with ASTM E108 or UL 790 by Underwriters Laboratories or another testing and inspecting agency acceptable to authorities having jurisdiction. Identify products with appropriate markings of applicable testing agency.

2.3 SLATE SHINGLES

A. Slate Shingles: ASTM C406/C406M, Grade S1; hard, dense, and sound; with chamfered edges and nail holes machine punched or drilled and countersunk; with no broken or cracked slates, no broken exposed corners, and no broken corners on covered ends that could sacrifice nailing strength or laying of a watertight roof.

1. Vermont Structural Slate Company, Inc., 802-265-4933

2. New England Slate, 802-287-2295

B. Thickness and Surface Texture: Nominal 1/4 inch (6 mm), smooth.

a. Slate from an earlier roof is stored on site. Verify thickness prior to placing order

C. Size:

1. Length: 18 inches (457 mm).

2. Width: 10 inches (254 mm).

D. Nail Holes: Two per shingle.

E. Butt Shape: Standard square cut.

F. Color: Black, Brown-Gray, Gray, Purple-Brown (Match slate colors existing on site) from manufacturer's full range.

G. Weather-Exposure Color Change: Weathering.

H. Starter Slate: Slate shingles with chamfered nail holes front-side punched.

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1. Length: Exposure of slate shingle plus headlap.

2.4 UNDERLAYMENT MATERIALS

A. Polymer-Modified Bitumen Sheet: Styrene-butadiene-styrene- (SBS) modified asphalt, glass-fiber-mat-reinforced sheet; minimum 55-mil (1.4-mm) nominal thickness; recommended in writing by manufacturer and acceptable to authorities having jurisdiction for use as underlayment in slate steep-slope roofing systems; and designed for mechanical fastening or adhesive attachment using roofing asphalt or cold-applied adhesive.

1. Atlas Roofing Corporation, 800-388-6134

2. CertainTeed Saint-Gobain, 800-233-8990

2.5 RIDGE ACCESSORIES

A. Terra Cotta Ridge Cap: Reuse existing stored on site. Provide and install replacements to match the existing cap as required to complete the job.

1. Type: Terra Cotta.

a. Custom Made Replacement Ridge Caps to match original stored on site.

1) Ludowici; http://www.ludowici.com

2) Equal as approved by Contracting Officer

2.6 ROOF TIE-OFF FALL PROTECTION

A. Roof Anchor: Purchase new as specified.

1. Basis of Design: Skyhook Roof Anchor; Part #00342; manufactured by Guardian Fall

Protection; https://www.guardianfall.com

2.7 ACCESSORIES

A. Asphalt Roofing Cement: ASTM D4586/D4586M Type II, asbestos free.

B. Butyl Sealant: ASTM C1311, single-component, solvent-release butyl rubber sealant;

polyisobutylene plasticized; heavy bodied.

C. Elastomeric Sealant: ASTM C920, Type S, Grade NS, one-part, non-sag, elastomeric polymer sealant; of class and use classifications required to seal joints in slate-shingle roofing and remain watertight; recommended in writing by manufacturer for applications indicated.

D. Roofing Asphalt: ASTM D312/D312M Type IV.

E. Cold-Applied Adhesive: Manufacturer's standard asphalt-based, one- or two-part, asbestos-free, cold-applied adhesive specially formulated for compatibility and use with underlayments.

F. Slating Nails: ASTM F1667, copper, smooth-shanked, wire nails; 0.135-inch- (3.4-mm-) minimum thickness; sharp pointed; with 3/8-inch- (10-mm-) minimum diameter flat head; of http://www.ludowici.com/ https://www.guardianfall.com/

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sufficient length to penetrate a minimum of 3/4 inch (19 mm) into sheathing or extend at least 1/8 inch (3 mm) through sheathing less than 3/4 inch (19 mm) thick.

1. Where nails are in contact with metal flashing, use nails made from same metal as flashing.

G. Underlayment Nails: Aluminum, stainless steel, or hot-dip galvanized-steel wire nails with low-profile metal or plastic caps, 1-inch- (25-mm-) minimum diameter.

1. Provide with minimum 0.0134-inch- (0.34-mm-) thick metal cap, 0.010-inch- (0.25-mm-) thick power-driven metal cap, or 0.035-inch- (0.89-mm-) thick plastic cap; and with minimum 0.083-inch- (2.11-mm-) thick ring shank or 0.091-inch- (2.31-mm-) thick smooth shank of length to penetrate at least 3/4 inch (19 mm) into roof sheathing or to penetrate through roof sheathing less than 3/4 inch (19 mm) thick.

H. Nailer Strips: Comply with requirements in Section 061000 "Rough Carpentry."

I. Nails for Wood Strips: ASTM F1667; common or box, steel wire, flat head, and smooth shank;

hot-dip galvanized.

2.8 METAL FLASHING AND TRIM

A. Comply with requirements in Section 076200 "Sheet Metal Flashing and Trim."

1. Sheet Metal: Copper and Tin Matted Stainless Steel.

B. Fabricate sheet metal flashing and trim to comply with recommendations in SMACNA's "Architectural Sheet Metal Manual" for design, dimensions, metal, and other characteristics of the item unless otherwise specified in this Section or indicated on Drawings.

1. Apron Flashings: Fabricate with lower flange extending a minimum 6 inches (152 mm) over and 6 inches (102 mm) beyond each side of downslope slate shingles and 6 inches (152 mm) up the vertical surface.

2. Step Flashings: Fabricate with a headlap of 3 inches (76 mm) and a minimum extension of 5 inches (127 mm) both horizontally and vertically.

3. Cricket and Backer Flashings: Fabricate with concealed flange extending a minimum of 24 inches (610 mm) beneath upslope slate shingles, 6 inches (152 mm)beyond each side of chimney, and 6 inches (152 mm) above the roof plane.

4. Counter-flashings: Fabricate to cover 4 inches (102 mm) of base flashing measured vertically; and in lengths required so that no step exceeds 8 inches (203 mm) and overall length is no more than 10 feet (3 m).

a. Provide metal receivers for installation.

5. Open-Valley Flashings: Fabricate from metal sheet not less than 24 inches (457 mm) wide in lengths not exceeding 10 feet (3 m), with 1-inch- (25-mm-) high, inverted-V profile water diverter at center of valley and equal flange widths of not less than 10 inches (203 mm).

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a. Hem flange edges for fastening with metal cleats.

6. Drip Edges: Fabricate in lengths not exceeding 10 feet (3 m) with roof-deck flange and 1-

1/2-inch (38-mm) fascia flange with 3/8-inch (10-mm) drip at lower edge.

a. Roof-Deck Flange at Eaves: Form to cover cant strip and fasten to roof deck.

b. Roof-Deck Flange at Rakes: Form to extend minimum of 2 inches (51 mm) onto roof deck.

C. Vent-Pipe Flashings: ASTM B749, Type L51121, at least 1/16 inch (1.6 mm) thick. Provide lead sleeve sized to slip over and turn down into pipe, soldered to skirt at slope of roof and extending at least 4 inches (102 mm) from pipe onto roof.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of the Work.

1. Examine roof sheathing to verify that sheathing joints are supported by framing and blocking or metal clips and that installation is within flatness tolerances.

2. Verify that substrate is sound, dry, smooth, clean, sloped for drainage, and completely anchored and that provisions have been made for flashings and penetrations through roofing.

3. Verify that vent stacks and other penetrations through roofing are installed and securely fastened.

B. Prepare written report, endorsed by Installer, listing conditions detrimental to performance of the Work.

C. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 INSTALLATION OF UNDERLAYMENT MATERIALS

A. Comply with slate-shingle and underlayment manufacturers' written installation instructions and with recommendations in NRCA's "The NRCA Roofing Manual: Steep-Slope Roof Systems" applicable to products and applications indicated unless more stringent requirements are specified in this Section or indicated on Drawings.

B. Polymer-Modified Bitumen Sheet: Install parallel with and starting at eaves.

1. Double-Layer Installation:

a. Install on roof deck in overlapping layers with a half-width plus 1-inch- (25-mm-) wide starter course at eaves completely covered by full-width second course.

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b. Install succeeding courses lapping previous courses by a half-width plus 1 inch (25

mm) in shingle fashion.

c. Lap ends a minimum of 6 inches (152 mm).

d. Stagger end laps between succeeding courses at least 72 inches (1829 mm).

e. Fasten with underlayment nails.

2. Install fasteners in a grid pattern of 12 inches (305 mm) between side laps with 6-inch (152-mm) spacing at side and end laps.

3. Install sheets over areas protected by self-adhering, polymer-modified bitumen sheet.

4. Terminate sheets extended up not less than 4 inches (102 mm) against sidewalls, curbs, chimneys, and other roof projections.

C. Self-Adhering, Polymer-Modified Bitumen Sheet: Install, wrinkle free.

1. Comply with low-temperature installation restrictions of underlayment manufacturer.

2. Install lapped in direction that sheds water. Lap sides not less than 4 inches (102 mm).

3. Lap ends not less than 6 inches (152 mm), staggered 24 inches (610 mm) between succeeding courses.

4. Roll laps with roller.

5. Prime concrete, masonry, and metal surfaces to receive self-adhering, polymer-modified bitumen sheet.

6. Single-Layer Installation: Install over entire roof deck.

7. Top-Layer Installation: Install as second layer over anchor-layer underlayment.

a. Completely cover anchor-layer underlayment.

b. Offset side laps halfway between side laps of underlying anchor layer and offset end laps from those of underlying anchor layer at least 72 inches (1829 mm).

8. Water and Ice-Dam Protection Installation: Install on roof deck where indicated below.

a. Eaves: Extend from edges of eaves 24 inches (610 mm) beyond interior face of exterior wall.

b. Rakes: Extend from edges of rakes 24 inches (610 mm) beyond interior face of exterior wall.

c. Valleys: Extend from lowest to highest point 18 inches (457 mm) on each side of centerline.

d. Hips: Extend 18 inches (457 mm) on each side.

e. Ridges: Extend 36 inches (914 mm)on each.

f. Sidewalls: Extend 18 inches (457 mm) beyond sidewalls and return vertically against sidewalls not less than 4 inches (102 mm).

g. Dormers, Chimneys, Skylights, and Other Roof-Penetrating Elements: Extend 18 inches (457 mm) beyond penetrating elements and return vertically against penetrating elements not less than 4 inches (102 mm).

h. Roof-Slope Transitions: Extend 18 inches (457 mm) on each roof slope.

9. Cover underlayment within seven days.

D. Valley Underlayment: Install one layer of 36-inch- (914-mm-) wide underlayment centered in valley, running full length of valley, and on top of underlayment on field of roof that is woven through valley. Install all layers of underlayment in and through valley tight with no bridging.

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1. Use same underlayment as installed on field of roof.

2. Lap ends at least 12 inches (305 mm) in direction that sheds water, and seal with asphalt roofing cement.

3. Fasten to roof deck with underlayment nails located as far from valley center as possible and only to extent necessary to hold underlayment in place until installation of valley flashing.

3.3 INSTALLATION OF METAL FLASHING AND TRIM

A. Install metal flashings and other sheet metal to comply with requirements in Section 076200 "Sheet Metal Flashing and Trim."

1. Install metal flashings in accordance with recommendations in NRCA's "The NRCA Roofing Manual: Steep-Slope Roof Systems."

B. Apron Flashings: Extend lower flange over and beyond each side of downslope slate shingles and up the vertical surface.

C. Step Flashings: Install with a headlap of 3 inches (76 mm) and extend both horizontally and vertically. Install with lower edge of flashing just upslope of, and concealed by, butt of overlying slate shingle. Fasten to roof deck only.

D. Cricket and Backer Flashings: Install against roof-penetrating elements, extending concealed flange beneath upslope slate shingles and beyond each side.

E. Counterflashings: Coordinate with installation of base flashing and fit tightly to base flashing.

Lap joints a minimum of 4 inches (102 mm) secured in a waterproof manner.

1. Install in reglets or receivers.

F. Hip Flashings: Install centered over hip with lower edge of flashing concealed by butt of overlying slate shingle. Fasten to roof deck.

G. Open-Valley Flashings: Install centered in valleys, lapping ends at least 8 inches (203 mm) in direction that sheds water.

1. Fasten upper end of each length to roof deck beneath overlap.

2. Secure hemmed flange edges into metal cleats spaced 24 inches (610 mm) apart and fastened to roof deck.

3. Adhere minimum 9-inch- (229-mm-) wide strips of self-adhering, polymer-modified bitumen sheet to metal flanges and to underlying self-adhering, polymer-modified bitumen sheet. Place strips parallel to and over flanges so that they will be just concealed by installed shingles.

H. Rake Drip Edges: Install over underlayment materials and fasten to roof deck.

I. Eave Drip Edges: Install over wood cant strip and under underlayment materials; fasten to roof deck.

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J. Pipe Flashings: Form flashing around pipe penetrations and slate shingles. Fasten and seal to slate shingles.

3.4 INSTALLATION OF SLATE SHINGLES

A. Beginning at eaves, install slate shingles in accordance with manufacturer's written instructions and with details and recommendations in NRCA's "The NRCA Roofing Manual: Steep-Slope Roof Systems."

1. Install wood strip cant at eave edges

2. Install shingle starter course chamfered face down.

B. Install first and succeeding shingle courses chamfered face up. Install full-width first course at rake edge.

1. Offset joints of uniform-width slate shingles by half the shingle width in succeeding courses.

2. Offset joints of random-width slate shingles a minimum of 3 inches (76 mm) in succeeding courses.

C. Maintain a 4-inch- (102-mm-) minimum headlap between succeeding shingle courses.

D. Maintain uniform exposure of shingle courses between eaves and ridge.

E. At eaves, extend shingle starter course and first course 1 inch (25 mm) over fasciae.

F. At rakes, extend shingle starter course and succeeding courses 1 inch (25 mm) over fasciae.

G. Cut and fit slate neatly around roof vents, pipes, ventilators, and other projections through roof.

H. Hang slate with two slating nails for each shingle, with nail heads lightly touching slate.

1. Do not drive nails home, which draws slates downward, and do not leave nail heads protruding enough to interfere with the overlapping shingle above.

2. At vented ridges, terminate slate shingles to produce a uniform airspace on each side of ridge apex.

I. Ridges: Install terra cotta ridge cap as shown in the drawings.

1. Install and anchor wood nailer strips of thicknesses to match abutting courses of slate shingles, terminating nailer strip 3 to 4 inches (76 to 102 mm) from the eave. Cover with self-adhering, polymer-modified bitumen sheet, extending to underlying slate but concealed by ridge slate.

2. Lay ridge slate in bed of butyl sealant.

3. Anchor ridge cap to supporting wood nailer strip with two nails for each slate shingle, without nails penetrating underlying slate.

4. Cover heads of exposed nails at final ridge shingle with butyl sealant.

J. Hips: Install and anchor terra cotta hips in same configuration as ridges.

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1. Install and anchor wood nailer strips of thickness to match abutting courses of slate shingles.

a. Cover nailer strip with self-adhering, polymer-modified bitumen sheet, extending on to underlying slate but concealed by terra cotta cap.

b. Anchor hip slate to nailer strip with two nails located in upper third of terra cotta cap length.

K. Open Valleys: Cut slate shingles to form straight lines at open valleys, trimming upper concealed corners of shingles. Widen exposed portion of open valley 1/8 inch in 12 inches (1:96)] from highest to lowest point.

1. Do not nail shingles to valley metal flashings.

L. Remove and replace damaged or broken slate shingles.

3.5 ROOFING INSTALLER'S WARRANTY

A. WHEREAS <Insert name> of <Insert address>, herein called the "Roofing Installer," has performed roofing and associated work ("the work") on the following project:

1. Owner: <Insert name of Owner>.

2. Owner Address: <Insert address>.

3. Building Name/Type: <Insert information>.

4. Building Address: <Insert address>.

5. Area of the Work: <Insert information>.

6. Acceptance Date: <Insert date>.

7. Warranty Period: <Insert time>.

8. Expiration Date: <Insert date>.

B. AND WHEREAS Roofing Installer has contracted (either directly with Owner or indirectly as a subcontractor) to warrant the work against leaks and faulty or defective materials and workmanship for designated Warranty Period, C. NOW THEREFORE Roofing Installer hereby warrants, subject to terms and conditions herein set forth, that, during Warranty Period, Roofing Installer will, at Roofing Installer's own cost and expense, make or cause to be made such repairs to or replacements of the work as are necessary to correct faulty and defective work and as are necessary to maintain the work in a watertight condition.

D. This Warranty is made subject to the following terms and conditions:

1. Specifically excluded from this Warranty are damages to the work and other parts of the building, and to building contents, caused by:

a. Lightning;

b. Peak gust wind speed exceeding 115 mph;

c. Fire;

d. Failure of roofing system substrate, including cracking, settlement, excessive deflection, deterioration, and decomposition;

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e. Faulty construction of copings, chimneys, skylights, vents, equipment supports, and other edge conditions and penetrations of the work;

f. Vapor condensation on bottom of roofing; and

g. Activity on roofing by others, including construction contractors, maintenance personnel, other persons, and animals, whether authorized or unauthorized by Owner.

2. When the work has been damaged by any of foregoing causes, Warranty shall be null and void until such damage has been repaired by Roofing Installer and until cost and expense thereof have been paid by Owner or by another responsible party so designated.

3. Roofing Installer is responsible for damage to the work covered by this Warranty but is not liable for consequential damages to building or building contents resulting from leaks or faults or defects of the work.

4. During Warranty Period, if Owner allows alteration of the work by anyone other than Roofing Installer, including cutting, patching, and maintenance in connection with penetrations, attachment of other work, and positioning of anything on roof, this Warranty shall become null and void on date of the alterations, but only to the extent the alterations affect the work covered by this Warranty. If Owner engages Roofing Installer to perform the alterations, Warranty shall not become null and void unless Roofing Installer, before starting the alterations, notified Owner in writing, showing reasonable cause for claim, that the alterations would likely damage or deteriorate the work, thereby reasonably justifying a limitation or termination of this Warranty.

5. During Warranty Period, if original use of roof is changed and it becomes used for, but was not originally specified for, a use or service more severe than originally specified, this Warranty shall become null and void on date of the change, but only to the extent the change affects the work covered by this Warranty.

6. Owner shall promptly notify Roofing Installer of observed, known, or suspected leaks, defects, or deterioration and shall afford reasonable opportunity for Roofing Installer to inspect the work and to examine evidence of such leaks, defects, or deterioration.

7. This Warranty is recognized to be the only warranty of Roofing Installer on the work and shall not operate to restrict or cut off Owner from other remedies and resources lawfully available to Owner in cases of roofing failure. Specifically, this Warranty shall not operate to relieve Roofing Installer of responsibility for performance of the work according to requirements of the Contract Documents, regardless of whether Contract was a contract directly with Owner or a subcontract with Owner's General Contractor.

E. IN WITNESS THEREOF, this instrument has been duly executed this <Insert day> day of <Insert month>, <Insert year>.

1. Authorized Signature: <Insert signature>.

2. Name: <Insert name>.

3. Title: <Insert title>.

END OF SECTION 073126

General Pemberton Headquarters Vicksburg, MS Vicksburg NMP Bennett Preservation Engineering PC

CANVAS DECKING AND DECK COATING 075710 - 1

SECTION 075710 – CANVAS DECKING AND DECK COATING

PART 1 - GENERAL

1.1 SUMMARY

A. Section includes:

1. Treatment of cut ends of wood decking with epoxy coatings.

2. Deck canvas and deck coating.

B. Related Sections:

1. Section 055000 “Metal Fabrications”.

2. Section 061000 “Rough Carpentry”.

3. Section 099113 “Exterior Painting”.

1.2 DEFINITIONS

A. MPI Gloss Level 1: Not more than five units at 60 degrees and 10 units at 85 degrees, according to ASTM D523.

B. MPI Gloss Level 3: 10 to 25 units at 60 degrees and 10 to 35 units at 85 degrees, according to ASTM D523.

C. MPI Gloss Level 4: 20 to 35 units at 60 degrees and not less than 35 units at 85 degrees, according to ASTM D523.

D. MPI Gloss Level 5: 35 to 70 units at 60 degrees, according to ASTM D523.

E. MPI Gloss Level 6: 70 to 85 units at 60 degrees, according to ASTM D523.

F. MPI Gloss Level 7: More than 85 units at 60 degrees, according to ASTM D523.

1.3 ACTION SUBMITTALS

A. Product Data: For each type of product. Include preparation requirements and application instructions.

1. Include printout of current "MPI Approved Products List" for each product category specified, with the proposed product highlighted.

B. Samples for Verification: For each type of paint system and each color and gloss of topcoat.

CANVAS DECKING AND DECK COATING 075710 - 2

1. Submit Samples on rigid backing, 8 inches square.

2. Step coats on Samples to show each coat required for system.

3. Label each coat of each Sample.

4. Label each Sample for location and application area.

C. Product List: For each product indicated, include the following:

1. Cross-reference to paint system and locations of application areas. Use same designations indicated on Drawings and in schedules.

2. Printout of current "MPI Approved Products List" for each product category specified, with the proposed product highlighted.

3. VOC content.

1.4 MAINTENANCE MATERIAL SUBMITTALS

A. Furnish extra materials, from the same product run, that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

1. Paint: 5 percent, but not less than 1 gal. of each material and color applied.

1.5 QUALITY ASSURANCE

A. Mockups: Apply mockups of canvas and coating system indicated and each color and finish selected to verify preliminary selections made under Sample submittals and to demonstrate aesthetic effects and set quality standards for materials and execution.

1. Contracting Officer will select one surface to represent surfaces and conditions for application of each paint system.

a. Horizontal Surfaces: Provide samples of at least 100 sq. ft.

b. Other Items: Contracting Officer will designate items or areas required.

2. Final approval of color selections will be based on mockups.

a. If preliminary color selections are not approved, apply additional mockups of additional colors selected by Contracting Officer at no added cost to Owner.

3. Approval of mockups does not constitute approval of deviations from the Contract Documents contained in mockups unless Contracting Officer specifically approves such deviations in writing.

4. Subject to compliance with requirements, approved mockups may become part of the completed Work if undisturbed at time of Substantial Completion.

CANVAS DECKING AND DECK COATING 075710 - 3

1.6 DELIVERY, STORAGE, AND HANDLING

A. Protect all materials from rain, fog, snow, dew, and all other forms of moisture that may alter condition of material. The moisture content of lumber and plywood may be checked in the field with a reliable moisture meter.

1.7 PROJECT CONDITIONS

A. Fit canvas to actual construction. Take field measurements before cutting or trimming material.

B. Coordinate installation of canvas with porch decking installation and other architectural millwork repair/replacement.

1.8 WARRANTY:

A. Provide a two-year warrant for labor and materials from cracking, delamination, coating failure, or joint failure.

PART 2 - PRODUCTS

2.1 CANVAS PRODUCTS

A. 15 oz. unbleached cotton canvas duck.

2.2 PROTECTIVE EPOXY SEALERS

A. Smith’s Clear Penetrating Epoxy Sealer.

B. Distributors:

1. Jamestown Distributors

17 Peckham Drive Bristol, RI 02809 800-497-0010

2.3 PAINT, GENERAL

A. MPI Standards: Products shall comply with MPI standards indicated and shall be listed in its "MPI Approved Products Lists."

B. Material Compatibility:

CANVAS DECKING AND DECK COATING 075710 - 4

1. Materials for use within each paint system shall be compatible with one another and substrates indicated, under conditions of service and application as demonstrated by manufacturer, based on testing and field experience.

2. For each coat in a paint system, products shall be recommended in writing by topcoat manufacturers for use in paint system and on substrate indicated.

C. VOC Content: Provide materials that comply with VOC limits of authorities having jurisdiction.

D. Colors: As selected by Contracting Officer from manufacturer's full range to match existing.

2.4 PAINT

A. Alkyd, Porch and Floor Enamel, MPI #27.

1. Manufacturers:

a. Benjamin Moore.

b. Sherwin Williams.

c. Durant Performance Coatings.

d. Approved equivalent.

2.5 FASTENERS

A. General:

1. All wood fastenings shall be per IBC Table 2304.9.1 “Fastening Schedule” unless noted otherwise.

2. Provide fasteners of size and type indicated that comply with requirements specified in this Article for material and manufacture for locations indicated on Drawings.

B. All steel fasteners in contact with pressure-preservative treated wood shall be stainless steel Type 304, 304L, 316 or 316L, unless otherwise indicated.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates and conditions, with Applicator present, for compliance with conditions affecting performance of the Work.

1. Commencement of work indicates acceptance of substrate by Installer.

CANVAS DECKING AND DECK COATING 075710 - 5

B. Verify suitability of substrates, including surface conditions and compatibility with existing finishes and primers.

1. Canvas shall be installed over smooth, sound substrate after all floor repairs or new decking has been installed. Applicator shall notify Contractor in writing if any conditions that will be detrimental to the proper installation of the canvas.

C. Proceed with coating application only after unsatisfactory conditions have been corrected.

1. Application of coating indicates acceptance of surfaces and conditions.

3.2 DISASSEMBLY

A. Disassemble all associated architectural porch elements as required for installation of canvas.

B. Remove architectural millwork by cutting through shaft of nail fasteners. Do not pull nails through; this will damage millwork. Use hacksaw blades mounted on handles intended for that purpose.

3.3 PREPARATION

A. Surface shall be cleaned of all unsound paint, dirt, grease, or other foreign particles that would adversely affect the proper bonding.

B. Fill any voids and ridges to provide smooth substrate.

C. Comply with manufacturer's written instructions and recommendations in "MPI Architectural Painting Specification Manual" applicable to substrates and paint systems indicated.

D. Remove hardware, covers, plates, and similar items already in place that are removable and are not to be painted. If removal is impractical or impossible because of size or weight of item, provide surface-applied protection before surface preparation and painting.

1. After completing painting operations, use workers skilled in the trades involved to reinstall items that were removed. Remove surface-applied protection.

3.4 APPLICATION

A. Apply paints according to manufacturer's written instructions and recommendations in "MPI Manual."

CANVAS DECKING AND DECK COATING 075710 - 6

B. Apply paints to produce surface films without cloudiness, spotting, holidays, laps, brush marks, roller tracking, runs, sags, ropiness, or other surface imperfections. Cut in sharp lines and color breaks.

3.5 INSTALLATION, GENERAL

A. All cut ends of new or replacement decking shall be coated with Smith’s Clear Penetrating Epoxy Sealer after cutting and before installation, as specified in specification Section 061000 “Rough Carpentry”.

B. Paint back side of canvas and paint deck with heavy coat of paint.

C. Immediately lay canvas into wet paint and stretch canvas to remove all air bubbles and creases. Canvas shall be laid in widths, as shown on Drawings. Seams shall be lapped, as shown on Drawings and secured with tacks.

D. Secure edges against structure with nails and cover with toe molding as indicated on Drawings.

E. Secure canvas by turning canvas down around the edge of the substrate and securing with sealant.

F. Caulk gap.

G. Terminate outer edge of canvas, as shown on Drawings.

H. Paint canvas with three additional coats of paint.

3.6 CLEANING AND PROTECTION

A. Protect work of other trades against damage from canvas and paint application. Correct damage to work of other trades by cleaning, repairing, replacing, and refinishing, as approved by Contracting Officer, and leave in an undamaged condition.

B. At completion of construction activities of other trades, touch up and restore damaged or defaced painted surfaces.

END OF SECTION 075710

JOSEPH K. OPPERMANN

ARCHITECT, P.A.

539 NORTH TRADE ST.

WINSTON-SALEM, NC

336.721.1711

DRAWN BY:

HHL

TECH REVIEW:

HHL

DATE:

4/22/21

RAKE EDGE DETAIL

ROOF AREA 12

GENERAL PEMBERTON’S HEADQUARTERS

VICKSBURG NATIONAL MILITARY PARK

SKA-1

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