LCSS MM REROOF _ Addendum No_01.pdf

ADDENDUM No. 01 PAGE 1 OF 3

MIDWAY MIDDLE SCHOOL ROOF REPLACEMENT CONSTRUCTION DOCUMENTS

LIBERTY COUNTY SCHOOL SYSTEM ISSUED FOR BID

MIDWAY, GEORGIA FEBRUARY 2026 (REV. 03/18/2026)

ADDENDUM No. 01

DATE: March 18, 2026

PROJECT: Liberty County School System Liberty County School System – Midway Middle School Roof Replacement

i) Midway Middle School: 425 Edgewater Drive, Midway, GA 31320.

BY: Cogdell & Mendrala Architects, PC (Architect) 517 East Congress Street

Savannah, GA 31401

This Addendum forms a part of the Contract Documents and modifies the original Drawings and Project

Manual dated February 2026.

I. GENERAL INFORMATION:

A. Agenda and sign-in sheet from the Mandatory Pre-Bid Conference held at Midway Middle School on

Thursday, March 12, 2026 are attached as part of this addendum.

1. All items on the agenda were read aloud and the meeting was concluded with a tour of the roof.

2. Prospective Bidders on attached sign-in sheet must meet all qualifications and requirements indicated in Project Manual in order to be eligible to bid, including completion of the Roofing

Qualification Form (Specification Section 00 11 54).

B. Any additional site visits needed prior to bid shall be requested via email to the school system to coordinate dates and times.

C. This addendum does not remove or release the contractor from any product requirements or required certifications. All products shall be required to meet the design intent of the basis of design product. If a substitute manufacturer or fabricator is accepted, they shall be required to modify the product as required to meet the design intent.

D. Substitution requests will not be reviewed unless submitted by the Bidder. Requests received from vendors will not be reviewed (Refer to 01 60 00 2.B.1).

II. SUBSTITUTION REQUESTS:

A. 07 54 19 Polyvinyl-Chloride (PVC) Roofing

1. Response: Carlisle Syntec Sure-Flex – Manufacturer/Product is denied.

2. Response: Versico Versiflex – Manufacturer/Product is denied.

III. RFI RESPONSE:

A. Question: Are you requiring roof and wall bond on this project? I saw it referenced in the specifications, but I wanted to confirm.

1. Response: No, Remove all references to 5-year roof and wall bond.

B. Question: [Reference Sheet G0.02] The R1 roof type assembly indicates a uniform thickness of existing LWIC. Are we to assume the existing slope of the roof is in the structural metal roof deck?

ADDENDUM No. 01 PAGE 2 OF 3

LIBERTY COUNTY SCHOOL SYSTEM ISSUED FOR BID

MIDWAY, GEORGIA FEBRUARY 2026 (REV. 03/18/2026)

1. Response: No, the existing as-built drawings indicate the existing structural decking / top of steel is at a consistent height, with the LWIC system sloping. Detail “R1” on Sheet G0.02 is only a construction type; it is not intended to indicate roof slopes or existing material thicknesses.

C. Question: [Reference Sheet G0.02] The R1 roof type assembly indicates a separation layer; however, the PVC roofing specs do not list a separation layer material type under Part 2 – Products. Do you have a preferred material type for the separation layer?

1. Response: Refer to revised specification section 07 54 19 for slip sheet / separation layer. Provide a separation layer compatible with submitted PVC membrane products listed in specification section 07 54 19.

D. Question: Will the new PVC membrane be mechanically fastened to the LWIC or down to the existing structural deck?

1. Response: PVC membrane to be mechanically fastened down to the structural decking.

E. Question: The Basis of Design PVC membrane Sika Sarnafil G410 is for a fully adhered system. Can you confirm the basis of design for this mechanically fastened system?

1. Response: Refer to revised specification section 07 54 19 for revised Basis of Design PVC membrane for a mechanically fastened PVC roofing system.

F. Question: The scope of work calls for a mechanically attached system through the LWIC. Can you clarify whether the roof system is to be fastened or adhered to the LWIC? The reason for the question is that specified membrane from Sika Sarnafil (G410) can only be adhered per the manufacturer.

G. Question: Will core sample information be provided for the existing roof system?

1. Response: No core sample information will be provided by the design team.

H. Question: There appeared to be tapered ISO insulation between some drainage points. Can this be confirmed? If it is confirmed, will removal and replacement of the ISO insulation be included in the scope of work?

1. Response: Existing roof construction at low-slope roofs is PVC roofing over LWIC system per detail R1 on Sheet G0.02 and as described in specifications. Refer to allowances and unit prices for LWIC replacement.

I. Question: Would it be acceptable to leave the existing fasteners in the LWIC to avoid leaving holes in the LWIC and metal deck pan?

1. Response: Refer to specification section 07 01 50.19 Preparation for Re-Roofing, indicating

“remove fasteners from deck or cut fasteners off slightly above deck surface.”

ADDENDUM No. 01 PAGE 3 OF 3

LIBERTY COUNTY SCHOOL SYSTEM ISSUED FOR BID

MIDWAY, GEORGIA FEBRUARY 2026 (REV. 03/18/2026)

J. Question: Is the specified Sanafil membrane changing from the G410 membrane to the S327 since the S327 is Sarnfil’s mechanically attached membrane sheet?

K. Question: Are we installing the walkpad per the plan location or per the specification? Specification section 07 54 19, Section 3.8A(1) states to install the walkpad continuously between all access points and units. Plans only indicate a continuous patch around the HVAC units.

1. Response: Specification section 07 54 19, Section 3.8A (1) lists typical locations that walkpads are required. It notes “locations indicated on drawings” and “as required by roof membrane manufacturer’s warranty requirements.” Provide walkpads where indicated on drawings and in any other locations required by specified manufacturer warranty requirements.

L. Question: Is ½” high density coverboard an acceptable alternative to the ½” Densdeck coverboard specified?

1. Response: All requests for substitution must be submitted per the requirements provided in the

Instructions to Bidders in the Project Manual. Refer to Specification Section 07 54 19 for list of approved manufacturers for Cover Board.

IV. PROJECT MANUAL:

A. Section 07 54 19 Polyvinyl Chloride (PVC) Roofing

1. Replace this section in its entirety.

V. DRAWINGS:

A. Not applicable for Addendum No. 01

END OF ADDENDUM No. 01

ADDENDUM No. 01 PAGE 1 OF 1

LIBERTY COUNTY SCHOOL SYSTEM ISSUED FOR BID

ADDENDUM No. 01

DATE: March 18, 2026

PROJECT: Liberty County School System Liberty County School System – Midway Middle School Roof Replacement

i) Midway Middle School: 425 Edgewater Drive, Midway, GA 31320.

BY: Cogdell & Mendrala Architects, PC (Architect)

Savannah, GA 31401

This Addendum forms a part of the Contract Documents and modifies the original Drawings and Project

Manual dated February 2026.

I. Attachments:

MEETING AGENDA Cogdell & Mendrala Architects

Savannah GA 31401

Meeting Description

Liberty County School System – Midway Middle School Roof Replacement

Project Number: 2026-14

Purpose Mandatory Pre-Bid Conference

Date March 12, 2026 Time 10:00 AM, EST Location Project Site

Items To Be Discussed

1. Introduction:

2. Bids Due: March 30, 2026 @ 11:00 AM {@ LCSS BOE 200 Bradwell Street}

3. All documents are available on the LCSS web site

4. Project Description:

A. Removing and replacing all low-sloped roof membranes, providing new edge metal trim at building perimeter, providing new gutters and downspouts and retrofit roof drains at existing locations.

5. Project Duration: NTP: May 13, 2026; Construction Start: May 23, 2026; Substantial Completion July 29, 2026

6. Liquidated Damages: $500 Per day

7. The adjacent areas and Campus will NOT be occupied during construction.

8. Construction Area: Limited to areas identified in Contract Documents.

9. Alternates:

A. None.

10. Allowances: (Refer to specification section 01 21 00 for more detailed information)

A. 00 43 21 Allowance Form to be included in the bid package.

B. Total of 7 Allowance(s)

11. Unit Prices: (Refer to specification section 01 22 00 for more detailed information)

A. 00 43 22 Unit Prices Form to be included in the bid package.

B. Total of 6 Unit Price(s)

12. Instruction to Bidders - Important to read and understand.

A. No Addenda will be issued within Five days of the bid date. {Wednesday, March 25, 2026}

B. Request for Interpretations must be received within Seven days prior to the bid date. {Monday, March 23, 2026}

C. There are no oral interpretations - must be in writing.

D. Request for Approval of a Substitute Product must be received within Ten days of the bid date. {Friday, March 20, 2026}

13. The Owner will only consider complete Bids. Make sure that all required documentation is submitted see Checklist for submitting Bid.

14. Understand the Owner’s Rights Concerning Award. There are several requirements that must be met (included in the Invitation to Bid.)

15. Site visits prior to bidding: 03/12/2026 after Mandatory Pre-bid Conference {Contractors required to check-in at main office}

16. Questions:

CONTACTS FOR QUESTIONS - ONLY IN WRITING, E-MAIL PREFERRED:

Design Professional: Stacy Pierce: stacy@cogdellmendrala.com

LIBERTY COUNTY SCHOOL SYSTEM ISSUED FOR BID

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 1

SECTION 07 54 19 - POLYVINYL-CHLORIDE (PVC) ROOFING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Polyvinyl chloride (PVC) roofing system [Mechanically fastened].

2. Roof insulation.

3. Insulation accessories and cover board.

4. Retrofit Roof Drains.

5. Walkways.

B. Related Requirements:

1. Section 012100 – “Allowances”.

2. Section 012200 – “Unit Prices.”

3. Section 03 52 16 “Lightweight Insulating Concrete” for lightweight insulating concrete deck to be installed where indicated.

4. Section 06 10 53 "Miscellaneous Rough Carpentry" for wood nailers, curbs, and blocking;

and for wood-based, structural-use roof deck panels.

5. Section 07 62 00 "Sheet Metal Flashing and Trim" for metal roof flashings and counterflashings.

6. Section 07 71 00 "Roof Specialties" for roof edge flashings.

7. Section 07 92 00 "Joint Sealants" for joint sealants, joint fillers, and joint preparation.

1.2 DEFINITIONS

A. Roofing Terminology: Definitions in ASTM D1079 and glossary in NRCA's "The NRCA Roofing

Manual: Membrane Roof Systems" apply to work of this Section.

1.3 PREINSTALLATION MEETINGS

A. Preliminary Roofing Conference: Before starting roof deck construction, conduct conference at

Project site.

1. Meet with Owner, Design Professional, Owner's insurer if applicable, testing and inspecting agency representative, roofing Installer, roofing system manufacturer's representative, deck Installer, air barrier Installer, and installers whose work interfaces with or affects roofing, including installers of roof accessories and roof-mounted equipment.

2. Review methods and procedures related to roofing installation, including manufacturer's written instructions.

3. Review and finalize construction schedule, and verify availability of materials, Installer's personnel, equipment, and facilities needed to make progress and avoid delays.

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 2

4. Review deck substrate requirements for conditions and finishes, including flatness and fastening.

5. Review structural loading limitations of roof deck during and after roofing.

6. Review base flashings, special roofing details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that affects roofing system.

7. Review governing regulations and requirements for insurance and certificates if applicable.

8. Review temporary protection requirements for roofing system during and after installation.

9. Review roof observation and repair procedures after roofing installation.

B. Preinstallation Roofing Conference: Conduct conference at Project site.

1. Meet with Owner, Design Professional, Owner's insurer if applicable, testing and inspecting agency representative, roofing Installer, roofing system manufacturer's representative, deck Installer, air barrier Installer, and installers whose work interfaces with or affects roofing, including installers of roof accessories and roof-mounted equipment.

2. Review methods and procedures related to roofing installation, including manufacturer's written instructions.

3. Review and finalize construction schedule, and verify availability of materials, Installer's personnel, equipment, and facilities needed to make progress and avoid delays.

4. Examine deck substrate conditions and finishes for compliance with requirements, including flatness and fastening.

5. Review structural loading limitations of roof deck during and after roofing.

6. Review base flashings, special roofing details, roof drainage, roof penetrations, equipment curbs, and condition of other construction that affects roofing system.

7. Review governing regulations and requirements for insurance and certificates if applicable.

8. Review temporary protection requirements for roofing system during and after installation.

9. Review roof observation and repair procedures after roofing installation.

1.4 ACTION SUBMITTALS

A. Product Data:

1. Polyvinyl chloride (PVC) roofing system.

2. Roof insulation.

3. Insulation accessories and cover board.

4. Retrofit Roof Drains.

5. Walkways.

6. For insulation and roof system component fasteners, include copy of SPRI's Directory of Roof Assemblies listing.

B. Shop Drawings: Include roof plans, sections, details, and attachments to other work, including the following:

1. Layout and thickness of insulation.

2. Base flashings and membrane terminations.

3. Flashing details at penetrations.

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 3

4. Roof plan showing orientation of steel roof deck and orientation of roof membrane, fastening spacings, and patterns for mechanically fastened roofing system.

5. Insulation fastening patterns for corner, perimeter, and field-of-roof locations.

6. Tie-in with vertical walls.

C. Samples for Verification: For the following products:

1. Roof membrane and flashing, of color required.

2. Walkway pads or rolls, of color required.

D. Wind Uplift Resistance Submittal: For roofing system, indicating compliance with wind uplift performance requirements.

1.5 INFORMATIONAL SUBMITTALS

A. Qualification Data: For Installer and manufacturer.

B. Manufacturer Certificates:

1. Performance Requirement Certificate: Signed by roof membrane manufacturer, certifying that roofing system complies with requirements specified in "Performance Requirements" Article.

a. Submit evidence of compliance with performance requirements.

2. Special Warranty Certificate: Signed by roof membrane manufacturer, certifying that all materials supplied under this Section are acceptable for special warranty.

C. Product Test Reports: For roof membrane and insulation, tests performed by independent qualified testing agency indicating compliance with specified requirements.

D. Evaluation Reports: For components of roofing system, from ICC-ES.

E. Field Test Reports:

1. Fastener-pullout test results and manufacturer's revised requirements for fastener patterns.

F. Field quality-control reports.

G. Sample Warranties: For manufacturer's special warranties.

1.6 CLOSEOUT SUBMITTALS

A. Maintenance Data: For roofing system to include in maintenance manuals.

B. Warranties.

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 4

1.7 QUALITY ASSURANCE

A. Qualifications:

1. Manufacturers: A qualified manufacturer that is UL listed and listed in SPRI's Directory of

Roof Assemblies for roofing system identical to that used for this Project.

2. Installers: A qualified firm that is approved, authorized, or licensed by roofing system manufacturer to install manufacturer's product and that is eligible to receive manufacturer's special warranty.

a. Minimum General Experience

1) A firm or individual that has and maintains an office within 200 miles of the project site for warranty and service availability.

2) A firm or Installer shall be “Top Tier” installer as determined by Manufacturer.

3) Installer shall have a minimum of ten (10) years documented experience installing PVC roofing systems of similar size, scope, and complexity.

4) Installer shall have successfully completed at least ten (10) PVC roofing projects within the past five (5) years, each with a similar size.

5) A firm or individual experienced in installing, erecting, or assembling work similar in material, design, and extent to that indicated for this Project, whose work has resulted in construction with a record of successful in-service performance, and has been in business under the same name for more than ten (10) years, and has been approved by the manufacturer of the product being installed.

b. Project-Specific Experience

1) Installer shall demonstrate experience installing PVC roofing systems over substrates and assemblies matching those required for this Project.

2) Installer shall demonstrate experience with all flashing, penetration, and accessory components specified herein.

c. Workforce Certification

1) No subcontracting of work under this section will be permitted.

2) All work under this section shall be performed by employees of the approved applicator only.

3) Personnel shall be trained and certified by the membrane manufacturer.

4) A qualified foreman must be trained and certified by roofing Manufacturer for the specific type of roofing used on the project shall be present on-site whenever roofing work is in progress.

1.8 DELIVERY, STORAGE, AND HANDLING

A. Deliver roofing materials to Project site in original containers with seals unbroken and labeled with manufacturer's name, product brand name and type, date of manufacture, approval or listing agency markings, and directions for storing and mixing with other components.

B. Store liquid materials in their original undamaged containers in a clean, dry, protected location and within the temperature range required by roofing system manufacturer. Protect stored liquid material from direct sunlight.

1. Discard and legally dispose of liquid material that cannot be applied within its stated shelf life.

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 5

C. Protect roof insulation materials from physical damage and from deterioration by sunlight, moisture, soiling, and other sources. Store in a dry location. Comply with insulation manufacturer's written instructions for handling, storing, and protecting during installation.

D. Handle and store roofing materials, and place equipment in a manner to avoid permanent deflection of deck.

1.9 FIELD CONDITIONS

A. Weather Limitations: Proceed with installation only when existing and forecasted weather conditions permit roofing system to be installed according to manufacturer's written instructions and warranty requirements.

1.10 WARRANTY

A. Warranty shall be provided at no additional cost to the Owner.

B. Special Warranty: Manufacturer agrees to repair or replace components of roofing system that fail in materials or workmanship within specified warranty period with no dollar limit.

1. Special warranty includes roof membrane, base flashings, roof insulation, roof edge, roof drain hubs, fasteners,, roofing accessories cover boards,] substrate board, and other components of roofing system.

2. Warranty shall cover labor and materials to correct leaks and defects encountered during the warranty period and shall take effect on the date of Material completion. Warranty shall not be voided by emergency leak repairs.

3. Warranty Period: 20 years from date of Material Completion.

C. Special Project Warranty: Submit roofing Installer's warranty, on warranty form at end of this Section, signed by Installer, covering the Work of this Section, including all components of roofing system such as roof membrane, base flashing, roof insulation, fasteners, cover boards, substrate boards, vapor retarders, and walkway products, for the following warranty period:

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

PART 2 - PRODUCTS

2.1 PERFORMANCE REQUIREMENTS

A. General Performance: Installed roofing and base flashings to withstand specified uplift pressures, thermally induced movement, and exposure to weather without failure due to defective manufacture, fabrication, installation, or other defects in construction. Roof system and flashings to remain watertight.

1. Accelerated Weathering: Roof membrane to withstand 2000 hours of exposure when tested according to ASTM G152, ASTM G154, or ASTM G155.

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 6

2. Impact Resistance: Roof membrane to resist impact damage when tested according to

ASTM D3746, ASTM D4272/D4272M, or the "Resistance to Foot Traffic Test" in FM Approvals 4470.

B. Material Compatibility: Roofing materials to be compatible with one another and adjacent materials under conditions of service and application required, as demonstrated by roof membrane manufacturer based on testing and field experience.

C. Wind Uplift Resistance: Design roofing system to resist the following wind uplift pressures when tested according to FM Approvals 4474, UL 580, or UL 1897:

1. Pressures as indicated in the drawings.

2. Hail-Resistance Rating: MH.

D. Energy Star Listing: Roofing system to be listed on the DOE's Energy Star "Roof Products Qualified Product List" for low-slope roof products.

E. Energy Performance: Roofing system to have an initial solar reflectance of not less than 0.55 and an 3-year aged thermal emissivity of not less than 0.75 when tested in accordance with

ANSI/CRRC S100.

F. Exterior Fire-Test Exposure: ASTM E108 or UL 790, Class A; for application and roof slopes indicated; testing by a qualified testing agency. Identify products with appropriate markings of applicable testing agency.

2.2 POLYVINYL CHLORIDE (PVC) ROOFING SYSTEM

A. PVC Sheet Type III: ASTM D4434/D4434M, fabric reinforced.

1. Products: Subject to compliance with requirements, provide one of the following:

a. Sika Sarnafil G410 S327 membrane; (Basis of design)

b. Duro-Last Roofing, Inc.

c. Johns Manville; a Berkshire Hathaway company; KEE.

d. Siplast Parasolo PVC

2. Thickness: 60 mils minimum.

a. The indicated Mils are required at all exposed locations and are a minimum.

Thinner membrane will not be accepted.

3. Exposed Face Color: White.

B. PVC KEE Sheet: ASTM D 6754, fabric reinforced.

1. Seamans Corporation, FiberTite

2. Thickness: 45 mils. Minimum

3. Exposed Face Color: White.

C. Source Limitations:

1. Obtain components including fasteners, and 07 62 00 Sheet Metal Flashing and Trim for roofing system from same manufacturer as membrane roofing or manufacturer approved by membrane roofing manufacturer.

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 7

2.3 ACCESSORY ROOFING MATERIALS

A. General: Accessory materials recommended by roofing system manufacturer for intended use and compatible with other roofing components.

1. Adhesives and Sealants: Comply with VOC limits of EPA.

B. Sheet Flashing: Manufacturer's standard sheet flashing of same material, type, reinforcement, thickness, and color as PVC sheet, unless noted otherwise.

1. Manufacturer’s standard PVC coated metal flashing material where indicated.

2. Flashing provided under Section 07 62 00 “Sheet Metal Flashing and Trim” shall be provided by roofing membrane manufacturer or a manufacturer approved by roofing membrane manufacturer and shall be included under warranties for work under this section.

C. Manufactured Drip Edge:

1. Roofing manufacturer’s standard one piece PVC coated drip edge in section lengths not exceeding 12 feet with a horizontal flange and a vertical leg fascia, terminating in a drip edge, and continuous cleat. Provide matching corner units.

a. Drip edge shall be tested under ANSI-SPRI ES-1.

b. Membrane flashing strip & tape joints will not be accepted.

D. Retrofit Roof Drains: Roofing Manufacturer’s standard spun aluminum retrofit drain with one piece seamless body, watertight seal, strainer dome and PVC coated flange for direct welding to PVC membrane.

1. Match size of retrofit drain to size of drainage pipe.

2. Provide manufacturer’s standard spun aluminum overflow unit at secondary drains.

E. Prefabricated Pipe Flashings: As recommended by roof membrane manufacturer.

F. Bonding Adhesive: Manufacturer's standard.

G. Slip Sheet/Separation Layer: Manufacturer's standard, of thickness required for application.

H. Metal Termination Bars: Manufacturer's standard, predrilled stainless steel or aluminum bars, approximately 1 by 1/8 inch thick; with anchors.

I. Fasteners: Factory-coated steel fasteners and metal or plastic plates complying with corrosion-resistance provisions in FM Approvals 4470, designed for fastening roofing components to substrate, and acceptable to roofing system manufacturer.

J. Miscellaneous Accessories: Provide pourable sealers, preformed cone and vent sheet flashings, preformed inside and outside corner sheet flashings, T-joint covers, lap sealants, termination reglets, and other accessories.

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 8

2.4 ROOF INSULATION

A. General: Preformed roof insulation boards manufactured or approved by PVC roof membrane manufacturer, approved for use in SPRI's Directory of Roof Assemblies listed roof assemblies.

B. Polyisocyanurate Board Insulation: ASTM C1289, Type II, Class 2, Grade 2, felt or glass-fiber mat facer on both major surfaces.

1. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

a. Atlas Roofing Corporation

b. Dow Chemical Company

c. Firestone Building Products

d. Sika USA

2. Provide product by manufacturer of roof membrane, or product by manufacturer approved in writing by membrane manufacturer.

C. Provide Manufacturer’s standard seam tape.

2.5 INSULATION ACCESSORIES AND COVER BOARD

A. General: Roof insulation accessories recommended by insulation manufacturer for intended use and compatibility with other roofing system components.

B. Glass-Mat Gypsum Cover Board: ASTM C1177/C1177M, water-resistant gypsum board.

1. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

a. Atlas Roofing Corporation

b. Certainteed; SAINT-GOBAIN.

c. National Gypsum Company.

d. USG Corporation.

2. Thickness: 1/2 inch.

3. Surface Finish: Fiberglass facer.

2.6 WALKWAYS

A. Flexible Walkways: Factory-formed, nonporous, heavy-duty, slip-resisting, surface-textured walkway pads or rolls, approximately 3/16 inch thick and acceptable to roofing system manufacturer.

1. Size: as indicated on the drawings.

2. Color: Contrasting with roof membrane.

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 9

PART 3 - EXECUTION

3.1 EXAMINATION

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

1. Verify that roof openings and penetrations are in place, curbs are set and braced, and roof-drain bodies are securely clamped in place.

2. Verify that wood blocking, curbs, and nailers are securely anchored to roof deck at penetrations and terminations and that nailers match thicknesses of insulation.

3. Verify that surface plane flatness and fastening of steel roof deck complies with requirements in Section 03 52 16 “Lightweight Insulating Concrete."

4. Verify that concrete substrate is visibly dry and free of moisture.

a. Test for capillary moisture by plastic sheet method according to ASTM D 4263.

5. Verify that minimum curing period recommended by roofing system manufacturer for lightweight insulating concrete roof decks has passed.

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

3.2 PREPARATION

A. Clean substrate of dust, debris, moisture, and other substances detrimental to roofing system installation according to roofing system manufacturer's written instructions. Remove sharp projections.

B. Prevent materials from entering and clogging roof drains and conductors and from spilling or migrating onto surfaces of other construction. Remove roof-drain plugs when no work is taking place or when rain is forecast.

C. Perform fastener-pullout tests according to roof system manufacturer's written instructions.

1. Submit test result within 24 hours of performing tests.

a. Include manufacturer's requirements for any revision to previously submitted fastener patterns required to achieve specified wind uplift requirements.

3.3 INSTALLATION OF ROOFING, GENERAL

A. Install roofing system according to roofing system manufacturer's written instructions.

B. Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of roofing system at end of workday or when rain is forecast.

Remove and discard temporary seals before beginning work on adjoining roofing.

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 10

3.4 INSTALLATION OF INSULATION

A. Coordinate installing roofing system components so insulation is not exposed to precipitation or left exposed at end of workday.

B. Comply with roofing system and insulation manufacturer's written instructions for installing roof insulation.

C. Where indicated, install tapered insulation under area of roofing to conform to slopes indicated.

D. Install insulation where existing is damaged or missing. Tape joints in layers of insulation below top layer with manufacturer’s standard joint tape.

3.5 INSTALLATION OF COVER BOARDS

A. Install cover boards over insulation (or in other locations as indicated on drawings) with long joints in continuous straight lines with end joints staggered between rows. Offset joints of insulation below a minimum of 6 inches in each direction.

1. Trim cover board neatly to fit around penetrations and projections, and to fit tight to intersecting sloping roof decks.

2. At internal roof drains, conform to slope of drain sump.

a. Trim cover board so that water flow is unrestricted.

3. Cut and fit cover board tight to nailers, projections, and penetrations.

B. Install retrofit drains in roof drain plumbing per manufacturer’s written recommendations and weld membrane to flange.

3.6 INSTALLATION OF MECHANICALLY FASTENED ROOF MEMBRANE

A. Mechanically fasten roof membrane over area to receive roofing according to roofing system manufacturer's written instructions.

B. Unroll roof membrane and allow to relax before installing.

C. For in-splice attachment, install roof membrane with long dimension perpendicular to steel roof deck flutes.

D. Start installation of roofing in presence of roofing system manufacturer's technical personnel.

E. Accurately align roof membrane, and maintain uniform side and end laps of minimum dimensions required by manufacturer. Stagger end laps.

F. Mechanically fasten or adhere roof membrane securely at terminations, penetrations, and perimeter of roofing.

G. Apply roof membrane with side laps shingled with slope of roof deck where possible.

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 11

H. In-Seam Attachment: Secure one edge of PVC sheet using fastening plates or metal battens centered within seam, and mechanically fasten PVC sheet to roof deck.

I. Seams: Clean seam areas, overlap roof membrane, and hot-air weld side and end laps of roof membrane and sheet flashings to ensure a watertight seam installation.

1. Test lap edges with probe to verify seam weld continuity. Apply lap sealant to seal cut edges of roof membrane and sheet flashings.

2. Verify field strength of seams a minimum of twice daily, and repair seam sample areas.

3. Repair tears, voids, and lapped seams in roof membrane that do not comply with requirements.

J. Install retrofit drains in roof drain plumbing per manufacturer’s written recommendations and weld membrane to flange.

3.7 INSTALLATION OF BASE FLASHING

A. Install sheet flashings and preformed flashing accessories, and adhere to substrates according to roofing system manufacturer's written instructions.

B. Apply bonding adhesive to substrate and underside of sheet flashing at required rate, and allow to partially dry. Do not apply to seam area of flashing.

C. Flash penetrations and field-formed inside and outside corners with cured or uncured sheet flashing.

D. Clean seam areas, overlap, and firmly roll sheet flashings into the adhesive. Hot-air weld side and end laps to ensure a watertight seam installation.

E. Terminate and seal top of sheet flashings and mechanically anchor to substrate through termination bars.

3.8 INSTALLATION OF WALKWAYS

A. Flexible Walkways: Install walkway products according to manufacturer's written instructions.

1. Install flexible walkways at the following locations:

a. Perimeter of each rooftop unit.

b. Between each rooftop unit location, creating a continuous path connecting rooftop unit locations.

c. Between each roof hatch and each rooftop unit location or path connecting rooftop unit locations.

d. Top and bottom of each roof access ladder.

e. Between each roof access ladder and each rooftop unit location or path connecting rooftop unit locations.

f. Locations indicated on Drawings.

g. As required by roof membrane manufacturer's warranty requirements.

2. Provide 6-inch clearance between adjoining pads.

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 12

3. Heat weld to substrate or adhere walkway products to substrate with compatible adhesive according to roofing system manufacturer's written instructions.

3.9 FIELD QUALITY CONTROL

A. intermediate Roof Inspection: Arrange for roofing system manufacturer's technical personnel to inspect roofing installation on completion, in presence of Design Professional, and to prepare inspection report.

B. Final Roof Inspection: Arrange for roofing system manufacturer's technical personnel to inspect roofing installation on completion, in presence of Design Professional, and to prepare inspection report.

C. Repair or remove and replace components of roofing system where inspections indicate that they do not comply with specified requirements.

D. Additional testing and inspecting, at Contractor's expense, will be performed to determine if replaced or additional work complies with specified requirements.

3.10 PROTECTING AND CLEANING

A. Protect roofing system from damage and wear during remainder of construction period. When remaining construction does not affect or endanger roofing, inspect roofing system for deterioration and damage, describing its nature and extent in a written report, with copies to

Design Professional and Owner.

B. Correct deficiencies in or remove roofing system that does not comply with requirements, repair substrates, and repair or reinstall roofing system to a condition free of damage and deterioration at time of Material Completion and according to warranty requirements.

C. Clean overspray and spillage from adjacent construction using cleaning agents and procedures recommended by manufacturer of affected construction.

1. Roof shall be free of construction debris, clean, and in a “new” condition upon completion. Roof shall be washed at Contractor’s expense if deemed necessary by

Owner prior to acceptance.

3.11 ROOFING INSTALLER'S WARRANTY

A. WHEREAS _______________________________ of ___________________________, herein called the "Roofing Installer," has performed roofing and associated work ("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 Work: <Insert information>.

6. Acceptance Date: _________________.

POLYVINYL-CHLORIDE (PVC) ROOFING ADDENDUM NO. 1 07 54 19 - 13

7. Warranty Period: <Insert time>.

8. Expiration Date: __________________.

B. AND WHEREAS Roofing Installer has contracted (either directly with Owner or indirectly as a subcontractor) to warrant said 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 said work as are necessary to correct faulty and defective work and as are necessary to maintain said 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 work and other parts of the building, and to building contents, caused by:

a. lightning;

b. peak gust wind speed exceeding <Insert mph>;

c. fire;

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

e. faulty construction of parapet walls, 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 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 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 work.

4. During Warranty Period, if Owner allows alteration of 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 said alterations, but only to the extent said alterations affect work covered by this Warranty. If Owner engages Roofing Installer to perform said alterations, Warranty shall not become null and void unless Roofing Installer, before starting said work, shall have notified Owner in writing, showing reasonable cause for claim, that said alterations would likely damage or deteriorate 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 promenade, work deck, spray-cooled surface, flooded basin, or other use or service more severe than originally specified, this Warranty shall become null and void on date of said change, but only to the extent said change affects work covered by this Warranty.

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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 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 said 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 original 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 ___________ day of

1. Authorized Signature: _______________________________________.

2. Name: ______________________________________.

3. Title: _______________________________________.

END OF SECTION 07 54 19