751 18297 ABG HOTGTI Addm 4.pdf

`DTMB-0414 (Rev 12/17)

DEPARTMENT OF TECHNOLOGY, MANAGEMENT AND BUDGET

State Facilities Administration Design and Construction Division

CONSTRUCTION PRE-BID ADDENDUM NO. 4

This form identifies an Addendum to Bidding Documents, and incorporates interpretations or clarifications, modifications, acceptance of proposed “or equal” materials, and other information into the Bidding Documents. Addenda will be numbered by the Professional and distributed through www.michigan.gov/SIGMAVSS as an attachment.

TO:

ALL BIDDERS

DATE ISSUED

1/3/2025

PROJECT NAME

Heart of the Great Turtle Island / Gchi Mshiikenh Deh Minising

FILE NUMBER

751/18297.ABG

PROFESSIONAL

Beckett & Raeder, Inc.

PROJECT DIRECTOR

Alan Goschka

BID OPENING DATE:

1/8/2025 at 2:00 p.m.

ADDENDUM ITEMS:

Specification Items:

1. Section 00010 Table of Contents (not re-issued) – Add the following technical specification section to the Table of Contents

TECHNICAL SPECIFICATIONS.

a. Section 09 51 00 Acoustical Ceilings

2. Section 09 51 00 Acoustical Ceilings (issued) – This section is newly issued in this addendum.

Drawing Items:

1. Drawing A1.0 LC First Floor Plan (not re-issued) -

a. Add all labor and material for the complete installation of a ceiling mounted 8” diameter vertical discharge exhaust fan with electrical and switch and exhaust ductwork vent to exterior in Janitor Closet #105. Exhaust fan shall be a UL listed Broan Model 505, 200 cfm. variable speed, low profile, 8.5 sones, 120V, or equal.

2. Drawing A4.0 LC - A4.3 LC Exterior Elevation and Drawing A6.0 LC Details (not re-issued) - .

a. Exterior storefront glass framing shall be a Kawneer Tri-Fab 451 UT VeraGlaze system as called for in the specifications along with Kawneer GLASSvent awning windows, as shown in the elevations and detailed in details, or equal.

b. Windows shall be Andersen 400 Series Contemporary Awing windows as shown in the elevations and noted in the specifications, or equal.

c. Provide additional internal steel reinforcing as required by window supplier.

End of Pre-Bid Addendum No. 4

ACKNOWLEDGEMENT: This Addendum must be acknowledged by the Bidder in the space provided in the Bid Summary and Bid Form. Failing to acknowledge Addenda may be cause for the Bid to be rejected. Addenda will become part of the Contract Documents.

PROFESSIONAL: Christy D. Summers, PLA, ASLA, LEED AP, Beckett & Raeder, Inc. DATE: 1/3/2025

APPROVED BY:

Alan Goschka

PROJECT DIRECTOR: DATE 1/3/2025

Michigan Department of Natural Resources File No. 751/18297.ABG

Heart of the Great Turtle Island / Gchi Mshiikenh Deh Minising

Issued for: Addendum No. 4 January 3, 2025

ACOUSTICAL CEILINGS 095100 - 1

PART ONE - GENERAL

SECTION 095100 - ACOUSTICAL CEILINGS

1.01 SECTION INCLUDES

A. Suspended metal grid ceiling systems.

B. Acoustical units.

C. Special trims and accessories.

1.02 REFERENCE STANDARDS

A. ASTM A580/A580M - Standard Specification for Stainless Steel Wire; 2018.

B. ASTM A653/A653M - Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc- Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process; 2020.

C. ASTM B209/B209M - Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate; 2021a.

D. ASTM C423 - Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method; 2022.

E. ASTM C635/C635M - Standard Specification for Manufacture, Performance, and Testing of Metal Suspension Systems for Acoustical Tile and Lay-in Panel Ceilings; 2022.

F. ASTM C636/C636M - Standard Practice for Installation of Metal Ceiling Suspension Systems for Acoustical Tile and Lay-In Panels; 2019.

G. ASTM E84 - Standard Test Method for Surface Burning Characteristics of Building Materials;

2022.

H. ASTM E119 - Standard Test Methods for Fire Tests of Building Construction and Materials;

2020.

1.03 ADMINISTRATIVE REQUIREMENTS

A. Coordination: Coordinate work of this section with installation of mechanical and electrical components and with other construction activities affected by work of this section.

1. Review with affected installers those locations of facility services lines and equipment within ceiling plenum that prevent installation of hangers at spacings compliant with limitations established in referenced standards. Arrange for each affected mechanical or electrical installer to provide necessary number of additional structural support points for ceiling installer.

B. Preinstallation Meeting: Convene one week before starting work of this section.

C. Sequencing: Schedule work of affected trades to minimize or eliminate installation conflicts and rework.

1. Supply hanger clips during steel deck erection. Supply additional hangers and inserts as required.

2. Ensure that acoustical ceilings are not installed until building is enclosed, sufficient heat is provided, dust generating activities have terminated, and overhead work is completed, tested, and approved. Do not install acoustical units until after interior wet work is dry.

1.04 SUBMITTALS

A. Shop Drawings: Indicate grid layout and related dimensioning.

ACOUSTICAL CEILINGS 095100 - 2

B. Product Data: Provide data on suspension system components and acoustical units.

1. Extra Acoustical Units: Quantity equal to 5 percent of total installed for Owner storage.

1.05 QUALITY ASSURANCE

A. Installer Qualifications: Company specializing in performing work of the type specified and with at least three years of documented experience and approved by manufacturer.

1.06 FIELD CONDITIONS

A. Maintain uniform temperature of minimum 60 degrees F (16 degrees C), and maximum humidity of 40 percent before, during, and after acoustical unit installation.

PART 2 - PRODUCTS

2.01 CEILING ASSEMBLIES

A. Acoustical Ceiling Assembly]:

1. Acoustical Panels: Mars 3/4", Item No. 88785.

a. Panel Size: 24 inches by 24 inches (2 by 2) panel (609.6 mm by 609.6 mm)

b. Panel Edge: SLT edge.

c. Color: Flat White.

d. Characteristics: Noise Reduction Coefficient = 0.75, Ceiling Attenuation Class = 35, Light Reflectance = 0.90, ClimaPlus Warranty: Yes.

2. Suspension Grid: Donn DX 15/16-inch Suspension System

a. Color: Flat White 050.

2.02 CEILING PERFORMANCE REQUIREMENTS

A. Design for maximum deflection of [1/360] of span.

B. Fire-Resistance Rating: Determined in accordance with test procedures in ASTM E119 and complying with the following:

1. Underwriters Laboratories. UL

2. Local authorities having jurisdiction.

2.03 CEILING COMPONENT PRODUCTS

A. Acoustical Units:

1. Acoustical Units - General: ASTM E1264, Fire Class A.

a. VOC Content: Certified as Low Emission by one of the following:

1) Product listing in UL (GGG).

2) Product listing in CHPS (HPPD).

b. Noise Reduction Coefficient (NRC) rating, Ceiling Attenuation Class (CAC) rating, and Light Reflectance Coefficient (LR) performance for each type of unit specified below, as determined in accordance with ASTM E1264.

c. Fire Class / Surface Burning Characteristics: Determined in accordance with test method ASTM E84.

1) Surface Burning Characteristics: Unless otherwise indicated, flame spread index of 25 or less, smoke developed index of 50 or less.

2. Acoustical Panels: Mineral fiber with membrane-faced overlay, with the following characteristics:

a. Classification: ASTM E1264 Type IV.

1) Pattern(s): Includes the following, as applicable to each product specified.

(a) E - Lightly textured.

b. Thickness: As applicable to each product specified.

c. Recycled Content: As applicable to selected products.

d. Products:

ACOUSTICAL CEILINGS 095100 - 3

1) USG Corporation; Mars 3/4" Panels.

2) Substitutions: Or approved equal.

B. Suspension Systems:

1. Metal Suspension Systems - General: Complying with ASTM C635/C635M; die cut and interlocking components, with curtain pockets and wall angles as required.

a. Materials:

1) Steel Grid: ASTM A653/A653M G30 coating, unless otherwise indicated.

2. Exposed Acoustical Suspension System: Hot-dipped galvanized steel grid and cap.

a. Application(s): Fire-resistance-rated assemblies.

b. Structural Classification: Intermediate-duty, when tested in accordance with ASTM C635/C635M.

c. Recycled Materials Content: Classified as containing greater than 50 percent total recycled content. Available for specific sizes and lengths.

d. Profile: Tee; 15/16 inch (24 mm) face width.

e. Finish: Baked enamel.

f. Color: White.

g. Products:

1) USG Corporation; DX 15/16 Inch Suspension System:

2) Substitutions: Or approved equal.

C. Moldings and Trim:

1. Edge Molding and Splices - General: Same material, thickness, and finish as metal pan panels, unless otherwise indicated.

1) USG Corporation; Compasso Elite Transitions - Acoustical to Acoustical: www.usg.com/ceilings/#sle.

b. Color: [White].

c. Products:

2.04 ACCESSORIES

A. Hat-Shaped Metal Channels: Steel, 22 gauge, 0.0299 inch (0.76 mm), minimum.

B. Suspension Wire[None - N/A]: Size and type as required for application, and ceiling system flatness requirement specified.

2.05 FABRICATION

A. Shop fabricate ceiling components to the greatest extent possible.

B. Fabricate components to allow access as required.

PART 3 - EXECUTION

3.01 EXAMINATION

A. Verify existing conditions before starting work.

B. Verify that layout of hangers will not interfere with other work.

C. Verify that field measurements are as indicated on shop drawings.

D. Start of installation constitutes acceptance of project conditions.

3.02 PREPARATION

A. Coordinate the location of hangers with other work.

B. Provide hanger clips during steel deck erection. Provide for anticipated additional hangers and inserts as required.

ACOUSTICAL CEILINGS 095100 - 4

C. Install ceiling system after major above-ceiling work is complete.

D. Acclimate wood ceiling materials by removing from packaging in installation area a minimum of 72 hours prior to installation.

3.03 INSTALLATION - SUSPENSION SYSTEM

A. Install suspension system in accordance with ASTM C636/C636M and manufacturer's instructions and as supplemented in this section.

B. Install hangers and inserts coordinated with overhead work. Provide additional hangers and supports as required.

C. Rigidly secure system, including integral mechanical and electrical components, for maximum deflection of 1:360.

D. Where ducts, facility services, or equipment prevent the regular spacing of hangers, reinforce the nearest affected hangers and related carrying channels to span the extra distance.

E. Do not support components on main runners or cross runners if weight causes total dead load to exceed deflection capability.

F. Support fixture loads using supplementary hangers located within 6 inches (152 mm) of each corner, or support components independently.

G. Do not eccentrically load system or induce rotation of runners.

H. Edge Moldings: Install at intersection of ceiling and vertical surfaces and penetrations, using components of maximum length; set level. Provide edge moldings at junction with other ceiling finishes. Miter corners. Provide preformed edge closures to match bullnosed cornered partitions.

1. Install in bed of acoustical sealant.

2. Use longest practical lengths.

3. Overlap and rivet corners.

3.04 INSTALLATION - ACOUSTICAL UNITS

A. Install acoustical units in accordance with manufacturer's instructions.

B. Fit acoustical units in place, free from damaged edges or other defects detrimental to appearance and function.

C. Fit edge trim neatly against abutting surfaces.

D. Install acoustical panels level, in uniform plane, and free from twist, warp, and dents.

E. Cutting Acoustical Units:

1. Cut to fit irregular grid and perimeter edge trim.

2. Make field cut edges of same profile as factory edges.

3.05 TOLERANCES

A. Maximum Variation from Flat and Level Surface: 1/8 inch in 10 feet (3 mm in 3 m).

B. Maximum Variation from Plumb of Grid Members Caused by Eccentric Loads: Two degrees.

3.06 CLEANING

A. Clean and touch up minor finish damage. Remove and replace components that cannot be successfully cleaned and repaired.

END OF SECTION