TTV-_GSA_Ft._Myers_USCH_Building_Envelope_Repairs-_Addendum01_07_02_19.pdf

TTVARCHITECTS, INC.

Architecture

Planning

Interior Design

115 East Forsyth St www.ttvarch.com

Jacksonville, FL 32202 Page 1 of 1

9 0 4 . 7 9 8 . 8 3 3 3 7/2/2019

Lic #aa0002609

#ib26000678 FT MEYERS COURTHOUSE ROOF - BUILDING ENCLOSURE, MECHANICAL REPAIRS AND IMPROVEMENTS

FOR

US GENERAL SERVICES ADMINISTRATION

FT. MYERS, FLORIDA

PROJECT # 47PE0719R0016

ADDENDUM #01

7/2/2019

CHANGES TO SPECIFICATIONS

The following Specification section is hereby revised and reissued in its entirety. New section will completely supersede the previous issuance:

Item 1: Section 07 01 50.73 ROOF COATING & LIQUID APPLIED FLASHING- ADDENDUM 01 (8

½” x 11”- 9 pages). Note that revisions within the specification section are highlighted in gray.

END OF ADDENDUM #01

Enclosure- 07 01 50.73 ROOF COATING & LIQUID APPLIED FLASHING- ADDENDUM 01 (8 ½” x

11”- 9 pages)

Distribution: GSA, for distribution

(1516add01)

Roof and Exterior Restoration Ft. Myers U.S. Courthouse Ft. Myers, Florida

SECTION 07 01 50.73 - ROOF COATING & LIQUID APPLIED FLASHING- ADDENDUM 01- 1

SECTION 07 01 50.73

ROOF COATING & LIQUID APPLIED FLASHING

ADDENDUM 01

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.

B. Section 07 01 50.16 - MAINTENANCE CLEANING OF MEMBRANE ROOFING

C. Section 07 54 00 – THERMOPLASTIC SINGLE-PLY ROOFING

D. Section 07 60 20 - SHEET METAL WORK

E. Section 07 71 00 - ROOF SPECIALTIES

F. Section 07 71 10 - WIND RESISTANT GUTTER SYSTEM

G. Section 07 92 00 - SEALANTS AND CALKING

H. Section 26 41 00 – FACILITY LIGHTNING PROTECTION

1.2 SUMMARY

A. This Section includes the following:

1. Roof re-coating preparation including roof patching and cleaning preparation for coating over ALL existing roof membrane surfaces.

2. Removal of existing base flashing aluminum foil with liquid applied flashings over ALL existing base flashings.

3. Application of coating on modified bituminous membrane roofing.

B. Related Requirements:

1. Division 00 Document “Available Information,” including the following pre-construction test report attachments.

a. Infrared roof moisture survey report.

b. Roofing fastener pull-out test report.

c. Roof core tensile strength test report and analysis.

d. Construction Drawings for existing roofing system.

C. NOTE THAT THE SPECIFIED COATING AND FLASHING SYSTEM MANUFACTURER TREMCO

AND SUBSEQUENT SYSTEM COMPONENTS ARE INTENDED TO ESTABLISH A BASIS

OF DESIGN AND MINIMUM LEVELS OF PERFORMANCE, OR APPROVED EQUAL.

1.3 MATERIALS OWNERSHIP

A. Demolished materials shall become Contractor's property and shall be removed from Project site.

SECTION 07 01 50.73 - ROOF COATING & LIQUID APPLIED FLASHING- ADDENDUM 01- 2

1.4 DEFINITIONS

A. Roofing Terminology: Refer to ASTM D 1079 and glossary in NRCA's "The NRCA Roofing Manual" for definition of terms related to roofing work in this Section.

B. Existing Roofing System: SBS-modified bituminous roofing, and components and accessories between deck and roofing membrane.

C. Roofing Re-Coating Preparation: Existing roofing that is to remain and be prepared to accept restorative coating application.

D. Patching: Removal of a portion of existing membrane roofing system from deck or removal of selected components and accessories from existing membrane roofing system and replacement with similar materials.

E. Remove: Detach items from existing construction and legally dispose of them off-site unless indicated to be removed and reinstalled.

F. Existing to Remain: Existing items of construction that are not indicated to be removed.

1.5 PERFORMANCE REQUIREMENTS

A. General: Provide recoated roofing membrane and base flashings that remain watertight; do not permit the passage of water; and resist specified uplift pressures, thermally induced movement, and exposure to weather without failure.

1. Accelerated Weathering: Roofing system shall withstand 2000 hours of exposure when tested according to ASTM G 152, ASTM G 154, or ASTM G 155.

B. Material Compatibility: Provide roofing materials that are compatible with one another under conditions of service and application required, as demonstrated by roofing manufacturer based on testing and field experience.

C. Roofing System Design: Modify roofing system as required so that rehabilitated roofing system will perform identically to systems that have been successfully tested by a qualified testing and inspecting agency to resist uplift pressure calculated according to ASCE 7.

1. Corner, Perimeter, and Field-of-Roof Uplift Pressures: As indicated on Drawings.

D. SPRI Wind Design Standard: Manufacture and install copings tested according to SPRI ES-1 and capable of resisting the following design pressures:

1. Design Pressure: As indicated on Drawings.

E. Solar Reflectance Index: Not less than 78 when calculated according to ASTM E 1980, based on testing identical products by a qualified testing agency.

F. Energy Star Listing: Provide roof coating that is listed on the DOE's ENERGY STAR "Roof Products Qualified Product List" for low-slope roof products.

G. Energy Performance: Roofing system shall have an initial solar reflectance index of not less than 0.70 and an emissivity of not less than 0.75 when tested according to CRRC-1, and/or comply with the Florida Building Code Energy Conservation Code 5th edition.

SECTION 07 01 50.73 - ROOF COATING & LIQUID APPLIED FLASHING- ADDENDUM 01- 3

H. Code Compliance: Roof system must have a current Florida Product Approval and must comply with current Florida Building Code 2017, 6th Edition

1.6 ACTION SUBMITTALS

A. Product Data: For each type of product specified.

1. Indicate CRRC Compliance.

2. Indicate Energy Star compliance.

1.7 INFORMATIONAL SUBMITTALS

A. Contractor's Product Certificate: Submit notarized certificate, indicating products intended for Work of this Section, including product names and numbers and manufacturers’ names, with statement indicating that products to be provided meet the requirements of the Contract Documents.

B. Qualification Data: For Installer, Manufacturer, and Roofing Inspector.

1. Letter written for this Project indicating manufacturer approval of Installer to apply specified products and provide specified warranty.

C. Product Test Reports: Based on evaluation of comprehensive tests performed by manufacturer and witnessed by a qualified testing agency, for components of roofing rehabilitation system.

D. Warranties: Unexecuted sample copies of special warranties to include Manufacturer’s confirmation that the specified warranty will be a No Dollar Limit (NDL) warranty.

E. Specifications of infrared and moisture testing equipment.

F. Level 1 Thermographer certification. Specifications of infrared equipment.

G. Infrared scan roof moisture survey showing roof plan and with designated wet roof areas marked on roof plan with measurements of wet areas.

H. Wind uplift test reports stamped by an engineer in compliance with ASCE 7-10.

I. Submit current Florida Product Approval documentation.

1.8 CLOSEOUT SUBMITTALS

A. Maintenance Data: To include in maintenance manuals.

B. Warranties: Executed copies of approved warranty forms.

1.9 QUALITY ASSURANCE

A. Installer Qualifications: An employer of workers trained and certified by manufacturer, including a full-time on-site supervisor with a minimum of five year’s experience installing products comparable to those specified, able to communicate verbally with Contractor, Architect, and employees, and the following:

SECTION 07 01 50.73 - ROOF COATING & LIQUID APPLIED FLASHING- ADDENDUM 01- 4

1. Qualified by the manufacturer to install manufacturer's product and furnish warranty of type specified.

B. Roofing Inspector Qualifications: A technical representative of manufacturer not engaged in the sale of products and experienced in the installation and maintenance of the specified roofing system, qualified to perform roofing observation and inspection specified in Field Quality Control Article, to determine Installer’s compliance with the requirements of this Project, and approved by the manufacturer to issue warranty certification. The Roofing Inspector shall be one of the following:

1. An authorized full-time technical employee of the manufacturer.

2. An independent party certified as a Registered Roof Observer by the Roof Consultants Institute, retained by the Contractor or the Manufacturer and approved by the Manufacturer.

C. Diagnostics Qualifications: An authorized Level 1 Thermographer employed by the manufacturer to perform a roof moisture survey prior to the installation of any roofing products to confirm or deny moisture within the existing roofing system. The roof moisture survey shall meet the following:

1. Level 1 Thermographer employed by the manufacturer issuing the warranty.

2. Thermal Imaging Camera must be a mid-wave camera that can operate in the 3.5 to 5 micron region of the electromagnetic spectrum.

3. Take infrared pictures of suspected wet regions.

4. Nuclear moisture gauge to verify the mid-wave infrared camera findings.

5. Mark all confirmed moisture findings on the roof with visible marking paint.

6. Document all findings on a roof plan.

D. Mandatory Roofing Rehabilitation Pre-Installation Conference: Conduct conference at Project site to comply with requirements in Division 01 Section "Project Management and Coordination." Review methods and procedures related to roofing system as follows:

1. Meet with Owner, Architect; roofing re-coating materials manufacturer's representative; roofing re-coating Installer including project manager and foreman; and installers whose work interfaces with or affects re-coating including installers of roof accessories and roof-mounted equipment requiring removal and replacement as part of the Work.

2. Review methods and procedures related to re-coating preparation, including membrane roofing system manufacturer's written instructions.

3. Review temporary protection requirements for existing roofing system that is to remain, during and after installation.

4. Review roof drainage during each stage of re-coating and review roof drain plugging and plug removal procedures.

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

6. Review base flashings, special roofing details, drainage, penetrations, equipment curbs, and condition of other construction that will affect re-coating.

7. Review HVAC shutdown and sealing of air intakes.

8. Review shutdown of fire-suppression, -protection, and -alarm and -detection systems.

9. Review procedures for asbestos removal or unexpected discovery of asbestos-containing materials.

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

11. Review existing conditions that may require notification of Owner before proceeding.

12. The installer shall record conference discussions to include decisions and agreements reached (or disagreements), and furnish copies of recorded discussions to each attending party. The main purpose of this meeting is to review foreseeable methods and procedures related to roofing work.

SECTION 07 01 50.73 - ROOF COATING & LIQUID APPLIED FLASHING- ADDENDUM 01- 5

1.10 PROJECT CONDITIONS

A. Owner assumes no responsibility for condition of areas to be rehabilitated.

1. Conditions existing at time of inspection for bidding will be maintained by Owner as far as practical.

2. Contractor is responsible for conclusions derived from Owner's existing condition documents.

B. Owner will occupy portions of building immediately below re-coating area. Conduct re-coating so Owner's operations will not be disrupted. Provide Owner with not less than 72 hours' notice of activities that may affect Owner's operations.

C. Protect building to be rehabilitated, adjacent buildings, walkways, site improvements, exterior plantings, and landscaping from damage or soiling from rehabilitation operations.

D. Maintain access to existing walkways, corridors, and other adjacent occupied or used facilities.

E. Weather Limitations: Proceed with rehabilitation work only when existing and forecasted weather conditions permit Work to proceed without water entering into existing roofing system or building.

F. Daily Protection: Coordinate installation of roofing so insulation and other components of roofing system not permanently exposed are not subjected to precipitation or left uncovered at the end of the workday or when rain is forecast.

1. Provide tie-offs at end of each day's work to cover exposed roofing and insulation with a course of coated roofing sheet set in roofing cement or hot roofing asphalt with joints and edges sealed.

2. Complete terminations and base flashings and provide temporary seals to prevent water from entering completed sections of roofing.

3. Remove temporary plugs from roof drains at end of each day.

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

1.11 WARRANTY

A. Special Warranty for Roof Rehabilitation covering both Labor & Materials: Written warranty in which Manufacturer agrees to repair roof rehabilitation installations that fail in materials or workmanship within specified warranty period.

1. Installation Inspection Requirement: By Roofing Inspector in accordance with requirements of Part

3 Field Quality Control Article.

2. Manufacturer Inspection and Preventive Maintenance Requirement: By manufacturer's technical representative, to report maintenance responsibilities to Owner necessary for preservation of Owner's warranty rights. The manufacturer's technical representative will provide inspection, preventative maintenance, and housekeeping services in years 2 and 5 of the warranty following completion of the project.

3. Warranty Period (NDL- Labor & Materials): 10 years from date of completion of rehabilitation work.

PART 2- PRODUCTS

2.1 BASIS OF DESIGN MANUFACTURERS

A. Basis-of-Design Manufacturer/Product: The roof system specified in this Section is based upon products of Tremco, Inc., Beachwood, OH, (800) 562-2728, www.tremcoroofing.com that are named in other Part 2 articles. Subject to compliance with requirements, provide the named product or an approved equivalent product by one of the following:

1. Garland Company

SECTION 07 01 50.73 - ROOF COATING & LIQUID APPLIED FLASHING- ADDENDUM 01- 6

2. Sika Corporation

2.2 MATERIALS, GENERAL

A. General: Re-coating materials recommended by roofing system manufacturer for intended use and compatible with components of existing membrane roofing system.

B. Temporary Roofing Materials: Selection of materials and design of temporary roofing is responsibility of Contractor.

C. Infill Materials: Where required to replace test cores and to patch existing roofing, use infill materials matching existing membrane roofing system materials, unless otherwise indicated.

2.3 ROOF COATING TYPE 1- RESTORATIVE COATINGS AND TOP COATINGS – Non Ponding Roof Sections

A. Polyurethane roof coating system top coat, bio-based low-odor low-VOC two-part, for application over compatible base coat.

1. Basis of design product: Tremco, Alphaguard BIO Base Coat

2. Combustion Characteristics, UL 790: Class A, for two-coat system

3. Volatile Organic Compounds (VOC), Maximum, ASTM D 3960: 1 g/L

4. Bio-Based Content: Minimum 70%

5. Minimum Thickness: 32 Wet Mils

B. Polyurethane roof coating system top coat, bio-based low-odor low-VOC two-part, for application over compatible base coat.

1. Basis of design product: Tremco, Alphaguard BIO Top Coat

2. Combustion Characteristics, UL 790: Class A, for two-coat system

3. Solar Reflective Index (SRI), ASTM E 1980: 103

4. Volatile Organic Compounds (VOC), Maximum, ASTM D 3960: 6 g/L

5. Tensile Strength, ASTM D412, 1,400 lb/in2

6. Minimum Thickness: 16 Wet Mils

7. Bio-Based Content: Minimum 60%

2.4 SEAM REINCFORCEMENT

A. Reinforce roof system with manufacturers recommended reinforcement and seam sealers.

2.5 FLASHING MATERIALS

A. Polyurethane roof coating system base coat & top coat, bio-based low-odor low-VOC two-part, for application over compatible base coat.

1. Basis of design product: Tremco, Alphaguard BIO Base Coat

2. Combustion Characteristics, UL 790: Class A, for two-coat system

3. Volatile Organic Compounds (VOC), Maximum, ASTM D 3960: 1 g/L

4. Bio-Based Content: Minimum 70%

5. Minimum Thickness: 32 Wet Mils

6. Basis of design product: Tremco, Alphaguard BIO Top Coat

7. Combustion Characteristics, UL 790: Class A, for two-coat system

8. Solar Reflective Index (SRI), ASTM E 1980: 103

9. Volatile Organic Compounds (VOC), Maximum, ASTM D 3960: 6 g/L

SECTION 07 01 50.73 - ROOF COATING & LIQUID APPLIED FLASHING- ADDENDUM 01- 7

10. Tensile Strength, ASTM D412, 1,400 lb/in2

11. Minimum Thickness: 16 Wet Mils

12. Bio-Based Content: Minimum 60%

B. Fully reinforce flashings with manufacturers recommended reinforcement.

2.6 ROOF COATING TYPE 2- RESTORATIVE COATINGS AND TOP COATINGS – Ponding Roof Sections

A. Polyurethane roof coating system top coat, bio-based low-odor low-VOC two-part, for application over compatible base coat.

1. Basis of design product: Tremco, Alphaguard BIO Base Coat

2. Combustion Characteristics, UL 790: Class A, for two-coat system

3. Volatile Organic Compounds (VOC), Maximum, ASTM D 3960: 1 g/L

4. Bio-Based Content: Minimum 70%

5. Minimum Thickness: 64 Wet Mils

B. Fully reinforce roof system with manufacturers recommended reinforcement.

C. Polyurethane roof coating system top coat, bio-based low-odor low-VOC two-part, for application over compatible base coat.

1. Basis of design product: Tremco, Alphaguard BIO Top Coat

2. Combustion Characteristics, UL 790: Class A, for two-coat system

3. Solar Reflective Index (SRI), ASTM E 1980: 103

4. Volatile Organic Compounds (VOC), Maximum, ASTM D 3960: 6 g/L

5. Tensile Strength, ASTM D412, 1,400 lb/in2

6. Minimum Thickness: 32 Wet Mils

7. Bio-Based Content: Minimum 60%

2.7 AUXILIARY ROOFING MEMBRANE MATERIALS

A. General: Auxiliary materials recommended by roofing system manufacturer for intended use and compatible with existing roofing system.

B. Asphalt Roofing Cement: ASTM D 4586, asbestos free, of consistency required by roofing system manufacturer for application.

C. Mastic Sealant: Polyisobutylene, plain or modified bitumen, nonhardening, nonmigrating, non-skinning, and nondrying.

D. Fasteners: Factory-coated steel fasteners and metal or plastic plates meeting corrosion-resistance provisions in FM 4470; designed for fastening roofing membrane components to substrate; tested by manufacturer for required pullout strength; and acceptable to roofing system manufacturer.

PART 3- EXECUTION

3.1 PREPARATION

A. Shut down air intake equipment in the vicinity of the Work in coordination with the Owner. Cover air intake louvers before proceeding with re-coating work that could affect indoor air quality or activate smoke detectors in the ductwork.

SECTION 07 01 50.73 - ROOF COATING & LIQUID APPLIED FLASHING- ADDENDUM 01- 8

1. Verify that rooftop utilities and service piping affected by the Work have been shut off before commencing Work.

B. Maintain roof drains in functioning condition to ensure roof drainage at end of each workday. Prevent debris from entering or blocking roof drains and conductors. Use roof-drain plugs specifically designed for this purpose. Remove roof-drain plugs at end of each workday, when no work is taking place, or when rain is forecast.

1. Do not permit water to enter into or under existing membrane roofing system components that are to remain.

3.2 ROOFING RE-COATING PREPARATION

A. Membrane Surface Preparation:

1. Remove blisters, ridges, buckles, and other substrate irregularities from existing roofing membrane that would inhibit application of uniform, waterproof coating.

2. Repair membrane at locations where irregularities have been removed.

3. Broom clean existing substrate.

4. Clean substrate using RoofTec System (See specification 07 01 50.16 – MAINTENANCE

CLEANING OF MEMBRANE ROOFING)

5. Verify that existing substrate is dry before proceeding with application of coating. Spot check substrates with an electrical capacitance moisture-detection meter.

3.3 FLASHING REPAIR

A. Remove existing base flashing aluminum facers on all areas where present

B. Do not damage metal counter flashings that are to remain. Replace metal counter flashings damaged during removal with counter flashings of same metal, weight or thickness, and finish.

C. Repair flashings, gravel stops, copings, and other roof-related sheet metal and trim elements. Reseal joints, replace loose or missing fasteners, and replace components where required to leave in a watertight condition.

3.4 PROTECTING AND CLEANING

A. Protect roofing system from damage and wear during remainder of construction period.

B. Correct deficiencies in or remove coating that does not comply with requirements, repair substrates, and reapply coating.

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

3.5 FIELD QUALITY CONTROL AND DAILY INSPECTIONS

A. Site Condition: Leave all areas around job site free of debris, roofing materials, equipment and related items after completion of job.

SECTION 07 01 50.73 - ROOF COATING & LIQUID APPLIED FLASHING- ADDENDUM 01- 9

B. Provide Daily inspections & daily progress reports to be performed by roofing Manufacturer’s Technical Rep-resentative with inspection reports to be submitted to GSA and Architect for review.

C. Notification Of Completion: Notify the manufacturer by means of manufacturer's printed Notification of Com-pletion form of job completion in order to schedule a final inspection date.

D. Final Inspection

1. Contractor to Coordinate Final Inspection with GSA, Coating/Liquid Applied Flashing Manufacturer’s Technical Representative, Architect, Roofing Subcontractor and Contractor’s qualified independent testing agency.

2. Post-Installation Meeting: Hold a meeting at the completion of the project, attended by all parties that were present at the pre-job conference. A punch list of items required for completion shall be compiled by the Contractor and the manufacturer's representative. Complete, sign, and mail the punch list form to the manufacturer's headquarters.

E. Issuance Of The Guarantee: Complete all post installation procedures and meet the manufacturer's final en-dorsement for issuance of the specified guarantee.

END OF SECTION