Attachment 2 - MAHG201024 Specs 20201215.pdf

MAHG20-1024

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SECTION 05 40 00

LIGHT GAUGE METAL FRAMING

PART 1 - GENERAL

1.01 DESCRIPTION

A. The intent of this Section is to establish the standard of quality for materials, fabrication and erection of light gauge studs, track, and related accessories to complete the work as indicated on the Drawings and described in the Specifications.

B. Related Requirements Specified Elsewhere

1. Section 09 25 50 - Gypsum Board Assemblies

1.02 APPLICABLE STANDARDS

A. American Iron and Steel Institute (AISI): Design of Cold Formed Steel Structural Members.

B. American Welding Society (AWS): Welding in building Construction.

C. American Society for Testing and Materials (ASTM), D. Building Code as applicable.

E. American Institute of Steel Construction (AISC): Manual of Steel Construction.

1.03 SUBMITTALS

Shop Drawings

1. Indicate all member gauges, spacing’s and sizes.

2. Indicate shop and field assembly details including cut and connections.

3. Indicate type and location of all welds, bolts and fastening devices.

4. Shop drawings shall indicate all prefabricated framing with individual panel drawings for each condition.

1.04 QUALITY ASSURANCE

A. For purposes of designating type, sizes and quality for the work under this Section, Specifications are based on products manufactured or furnished by INRYCO/Milcor Steel Framing Systems.

B. Products of other manufacturers similar to those specified herein will be acceptable for use on the project when approved in writing by the Contracting Officer. Supporting technical literature, samples, drawings and performance data sheets must be submitted for comparison.

C. Products for use on this project shall be of one manufacturer unless noted specifically otherwise herein.

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PART 2 - MATERIALS

2.01 FRAMING MEMBERS

All framing members shall be of the type and size as shown on the Drawings. Minimum 18 gauge.

PART 3 - EXECUTION

3.01 FABRICATION

A. Framing components may be pre-assembled into panels prior to erecting. Prefabricated panels shall be square with components and attached in a manner as to prevent racking.

B. All framing components shall be cut squarely for attachment to perpendicular members, or as required for an angular fit against abutting members. Members shall be held positively in place until properly fastened.

C. Axially loaded studs shall be installed in a manner, which will assure that the ends of the studs are positioned against the inside track web, prior to stud and track attachment.

3.02 ERECTION WALLS

A. Erect framing and panels plumb, level and square in strict accordance with the approved shop drawings.

B. Handling and lifting of prefabricated panels shall be done in a manner as to not cause distortion in any member.

C. Track shall be securely anchored to the supporting structure.

D. At track butt joints, abutting pieces of track shall be securely anchored to a common structural element, or they shall be butt-welded or spliced together.

E. Studs shall be plumbed, aligned and securely attached to the flange or webs of both upper and lower tracks.

F. Wall stud bridging shall be attached in a manner to prevent stud rotation. Bridging rows shall be spaced according to the manufacturer. Minimum bridging shall be walls Up to 10,-0" height;

one row at mid-height. Walls exceeding 10'-O" height; bridging rows spaced not to exceed 5'-O" on center.

G. Framed wall openings shall include headers and supporting studs as necessary.

H. Temporary bracing shall be provided until erection is completed.

3.03 RECOMMENDED EQUIPMENT

A. Cutting

1. A radial arm 7½ hp (3425 rpm) saw with an 18" x 5/32" friction blade, style 9MR, having

280 teeth (10 teeth per inch) is frequently used in the shop. Other suggested shop cutting equipment includes either the radial arm saw or an abrasive cut-off (chop) saw with a reinforced abrasive blade or a band saw.

2. For field cutting and small quantities, a 3 hp worm drive Skill saw equipped with a reinforced abrasive cut-off blade, a band saw or a power band saw will serve

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B. Welding

A wire feed type welder is recommended for fastest and most uniform welding in the shop. Good welds are also obtained with a 3/32" or 1/8" AWS type 6013 or 7014 rod with a welding head of 60-110 amperes depending on the gauge of material and the fit of the parts.

C. Screw Attachment

1. For screwing of metal to metal, a reversible screw gun capable of handling metal self tapping screws is acceptable.

2. For attachment of metal to concrete, a self contained, .22 caliber power driving tool may be used.

3.06 CLEAN-UP

A. Remove all debris from site upon completion of work.

END OF SECTION

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SECTION 06 65 00

SOLID SURFACE FABRICATIONS

PART I - GENERAL

1.01 DESCRIPTION

The work required under this Section consists of acrylic (polymer) solid surface material used for reception counter surfacing and counter top surfacing to complete the work as indicated on the Drawings and described in the Specifications.

1.02 REFERENCES

A. Applicable Standards: Standards of the following, as referenced herein:

1. American National Standards Institute (ANSI)

2. American Society for Testing and Materials (ASTM)

3. National Electrical Manufacturers Association (NEMA)

1.03 SUBMITTALS

A. Shop Drawings: Indicate dimensions, component sizes, fabrication details, attachment provisions and coordination requirements with adjacent work.

B. Samples: Submit minimum 2” x 2” (50 mm x 50 mm) samples. Indicate full range of color and pattern variation. Approved samples will be retained as standards for work.

C. Product Data: Indicate product description, fabrication information and compliance with specified performance requirements.

D. Maintenance Data: Submit manufacturer’s care and maintenance data, including repair and cleaning instructions. Include in project closeout documents.

1.04 QUALITY ASSURANCE

A. Allowable Tolerances:

1. Variation in component size: + 1/8” (3 mm).

2. Location of openings: + 1/8” (3 mm) from indicated location.

1.05 DELIVERY, STORAGE AND HANDLING

A. Deliver no components to project site until areas are ready for installation. Store components indoors prior to installation.

B. Handle materials to prevent damage to finished surfaces. Provide protective coverings to prevent physical damage or staining following installation for duration of project.

PART 2 - PRODUCTS

2.01 SOLID SURFACE FABRICATIONS

A. Specifications are based on solid surface materials manufactured by Dupont Corian

B. Or Approved Equal.

C. Material: Homogeneous filled acrylic; not coated, laminated or of composite construction;

meeting ANSI Z124.3.

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1. Superficial damage to a depth of 0.010” (25mm) shall be repairable by sanding and polishing.

D. Laundry Counter Tops: Horizontal surfaces and vertical surfaces shall be thick solid polymer material adhesively joined with inconspicuous seams; edge details shall be bullnose style.

E. Color: Color shall be priced from the Private, Deep Color, and Terra Collections price group.

2.02 ACCESSORIES

A. Joint Adhesive: Manufacturer’s standard two part adhesive kit to create inconspicuous, non-porous joints, with a chemical bond.

2.03 FABRICATION

A. Fabricate components in shop to greatest extent practical to sizes and shapes indicated, in accordance with approved shop drawings and solid polymer manufacturer requirements.

B. Form joints between components using manufacturer’s standard joint adhesive. Joints shall be inconspicuous in appearance and without voids. Attach 2” (50 mm) wide reinforcing strip of solid polymer material under each joint.

C. Rout and finish component edges to a smooth, uniform finish. Rout all cutouts and sand all edges smooth. Repair or reject defective or inaccurate work.

PART 3 - EXECUTION

3.01 INSTALLATION

A. Install components plumb and level, in accordance with approved shop drawings and product installation details.

B. Form filed joints using manufacturer’s recommended adhesive, with joints inconspicuous in finished work. Keep component and hands clean when making joints.

C. Provide backsplashes and endsplashes as indicated. Adhere to countertops using manufacturer’s standard color matched silicone sealant.

D. Keep components and hands clean during installation. Remove adhesives, sealants and other stains.

E. Protect surfaces from damage. Replace damaged work that cannot be repaired to Architect’s satisfaction.

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SECTION 07 92 00

JOINT SEALANTS

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM) ASTM C1311 (2010) Standard Specification for Solvent Release Agents

ASTM C509 (2006; R 2011) Elastomeric Cellular Preformed Gasket and Sealing Material

ASTM C734 (2006; R 2012) Low-Temperature Flexibility of Latex Sealant After Artificial Weathering

ASTM C834 (2010) Latex Sealants

ASTM C919 (2012) Use of Sealants in Acoustical Applications

ASTM C920 (2011) Standard Specification for Elastomeric Joint Sealants

ASTM D1056 (2007) Standard Specification for Flexible Cellular Materials - Sponge or Expanded Rubber

ASTM D1667 (2005; R 2011) Flexible Cellular Materials - Poly (Vinyl Chloride) Foam (Closed-Cell)

ASTM D217 (2010) Cone Penetration of Lubricating Grease

ASTM D2452 (2003; R 2009) Standard Test Method for Extrudability of Oil- and Resin-Base Caulking Compounds

ASTM D2453 (2003; R 2009) Standard Test Method for Shrinkage and Tenacity of Oil- and Resin-Base Caulking Compounds

ASTM E84 (2012c) Standard Test Method for Surface Burning Characteristics of Building Materials

1.2 SUBMITTALS

Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

A. SD-03 Product Data

1. Sealants

2. Primers

3. Bond breakers

4. Backstops

Manufacturer's descriptive data including storage requirements, shelf life, curing time, instructions for mixing and application, and primer data (if required). Provide a copy of the Material Safety Data Sheet for each solvent, primer or sealant material.

B. SD-07 Certificates

1. Sealant

2. Certificates of compliance stating that the materials conform to the specified requirements.

1.3 ENVIRONMENTAL CONDITIONS

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Apply sealant when the ambient temperature is between 4 and 32 degrees C 40 and 90 degrees F.

1.4 DELIVERY AND STORAGE

Deliver materials to the job site in unopened manufacturers' external shipping containers, with brand names, date of manufacture, [color,] and material designation clearly marked thereon. Label elastomeric sealant containers to identify type, class, grade, and use. Carefully handle and store materials to prevent inclusion of foreign materials or subjection to sustained temperatures exceeding 32 degrees C 90 degrees F or less than 4 degrees C 0 degrees F.

1.5 QUALITY ASSURANCE

1.4.1 Compatibility with Substrate

Verify that each of the sealants are compatible for use with joint substrates.

1.4.2 Joint Tolerance

Provide joint tolerances in accordance with manufacturer's printed instructions.

PART 2 PRODUCTS

2.1 SEALANTS

Provide sealant that has been tested and found suitable for the substrates to which it will be applied.

2.1.1 Interior Sealant

Provide ASTM C834 [ASTM C920, Type S or M, Grade NS, Class 12.5, Use NT. Location(s) and color(s) of sealant for the following:

1. Location: Small voids between walls and door frames, built-in or surface-mounted equipment and fixtures, and similar items.

2. Color: As selected by Designer of Record

2.1.2 Floor Joint Sealant

Provide ASTM C920, Type S or M, Grade P, Class 25, Use T. Provide location(s) and color(s) of sealant as follows:

1. Location: Seats of metal thresholds for exterior doors.

2. Color: As selected by Designer of Record

2.2 PRIMERS

Provide a non-staining, quick-drying type and consistency recommended by the sealant manufacturer for the particular application.

2.3 BOND BREAKERS

Provide the type and consistency recommended by the sealant manufacturer to prevent adhesion of the sealant to backing or to bottom of the joint.

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2.4 BACKSTOPS

Provide glass fiber roving or neoprene, butyl, polyurethane, or polyethylene foams free from oil or other staining elements as recommended by sealant manufacturer. Provide 25 to 33 percent oversized backing for closed cell and 40 to 50 percent oversized backing for open cell material, unless otherwise indicated. Make backstop material compatible with sealant. Do not use oakum and other types of absorptive materials as backstops.

2.5 CLEANING SOLVENTS

Provide type(s) recommended by the sealant manufacturer (except for aluminum and bronze surfaces that will be in contact with sealant).

PART 3 EXECUTION

3.1 SURFACE PREPARATION

Clean surfaces from dirt frost, moisture, grease, oil, wax, lacquer, paint, or other foreign matter that would tend to destroy or impair adhesion.

Remove oil and grease with solvent. Surfaces must be wiped dry with clean cloths. When resealing an existing joint, remove existing caulk or sealant prior to applying new sealant. For surface types not listed below, contact sealant manufacturer for specific recommendations.

3.1.1 Steel Surfaces

Remove loose mill scale by sandblasting or, if sandblasting is impractical or would damage finish work, scraping and wire brushing. Remove protective coatings by sandblasting or using a residue-free solvent.

3.1.2 Aluminum or Bronze Surfaces

Remove temporary protective coatings from surfaces that will be in contact with sealant. When masking tape is used as a protective coating, remove tape and any residual adhesive just prior to sealant application. For removing protective coatings and final cleaning, use non-staining solvents recommended by the manufacturer of the item(s) containing aluminum or bronze surfaces.

3.1.3 Concrete and Masonry Surfaces

Where surfaces have been treated with curing compounds, oil, or other such materials, remove materials by sandblasting or wire brushing. Remove laitance, efflorescence and loose mortar from the joint cavity.

3.1.4 Wood Surfaces

Keep wood surfaces to be in contact with sealants free of splinters and sawdust or other loose particles.

3.2 SEALANT PREPARATION

Do not add liquids, solvents, or powders to the sealant. Mix Multi-component elastomeric sealants in accordance with manufacturer's instructions.

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3.3 APPLICATION

A. Acceptable Ratios:

JOINT WIDTH JOINT DEPTH

Minimum Maximum

For metal, glass, or other nonporous surfaces:

6 mm (minimum) 6 mm 6 mm over 6 mm 1/2 of width Equal to width

For wood, concrete, or masonry.

6 mm (minimum) 6 mm 6 mm over 6 mm to 13 mm 6 mm Equal to width over 13 mm to 50 mm 50 mm 16 mm

Over 50 mm As recommended by sealant manufacturer

For metal, glass, or other nonporous surfaces:

1/4 inch (minimum) 1/4 inch 1/4 inch

For wood, concrete, or masonry.

1/4 inch (minimum) 1/4 inch 1/4 inch over 1/4 inch to 1/2 inch 1/4 inch Equal to width over 1/2 inch to 2 inch 1/2 inch 5/8 inch

Over 2 inch As recommended by sealant manufacturer over 1/4 inch 1/2 of width Equal to width

B. Unacceptable Ratios: Where joints of acceptable width-to-depth ratios have not been provided, clean out joints to acceptable depths and grind or cut to acceptable widths without damage to the adjoining work. Grinding is not required on metal surfaces.

3.3.2 Masking Tape

Place masking tape on the finish surface on one or both sides of a joint cavity to protect adjacent finish surfaces from primer or sealant smears. Remove masking tape within 10 minutes after joint has been filled and tooled.

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3.3.3 Backstops

Install backstops dry and free of tears or holes. Tightly pack the back or bottom of joint cavities with backstop material to provide a joint of the depth specified. Install backstops in the following locations:

Where backstop is not indicated but joint cavities exceed the acceptable maximum depths specified in se.

3.3.4 Primer

Immediately prior to application of the sealant, clean out loose particles from joints. Where recommended by sealant manufacturer, apply primer to joints in concrete masonry units, wood, and other porous surfaces in accordance with sealant manufacturer's instructions. Do not apply primer to exposed finish surfaces.

3.3.5 Bond Breaker

Provide bond breakers to the back or bottom of joint cavities, as recommended by the sealant manufacturer for each type of joint and sealant used, to prevent sealant from adhering to these surfaces. Carefully apply the bond breaker to avoid contamination of adjoining surfaces or breaking bond with surfaces other than those covered by the bond breaker.

3.3.6 Sealants

Provide a sealant compatible with the material(s) to which it is applied. Do not use a sealant that has exceeded shelf life or has jelled and cannot be discharged in a continuous flow from the gun.

Apply the sealant in accordance with the manufacturer's printed instructions with a gun having a nozzle that fits the joint width. Force sealant into joints to fill the joints solidly without air pockets.

Tool sealant after application to ensure adhesion. Make sealant uniformly smooth and free of wrinkles. Upon completion of sealant application, roughen partially filled or unfilled joints, apply sealant, and tool smooth as specified. Apply sealer over the sealant when and as specified by the sealant manufacturer.

3.4 PROTECTION AND CLEANING

3.4.1 Protection

Protect areas adjacent to joints from sealant smears. Masking tape may be used for this purpose if removed 5 to 10 minutes after the joint is filled.

3.4.2 Final Cleaning

Upon completion of sealant application, remove remaining smears and stains and leave the work in a clean and neat condition.

Masonry and Other Porous Surfaces: Immediately scrape off fresh sealant that has been smeared on masonry and rub clean with a solvent as recommended by the sealant manufacturer. Allow excess sealant to cure for 24 hour then remove by wire brushing or sanding. Metal and Other Non-Porous Surfaces:

Remove excess sealant with a solvent-moistened cloth.

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SECTION 09 25 50

GYPSUM BOARD ASSEMBLIES

PART 1 GENERAL

1.1 SUMMARY

A. This Section includes the following:

1. Interior gypsum wallboard – regular

2. Interior screw type support systems

3. Wallboard finishing (joint tape-and-compound treatment)

4. Gypsum wallboard accessories including control joints

5. Levels of Gypsum Board Finish

B. Related Sections include the following:

Section 05 40 00 – Light Gauge Metal Framing

1.2 SUBMITTALS

A. Product Data:

1. Submit manufacturer’s product specifications and installation instructions for each gypsum board component, including other data as may be required to show compliance with these specifications.

1.3 QUALITY ASSURANCE

A. Gypsum Board:

1. GA-216, Specifications for the Application and Finishing of Gypsum Board” by Gypsum Association

2. GA-214-96, “Recommended Levels of Gypsum Board Finish” by Gypsum Association.

B. Metal Support System Installation: ASTM C754 C. Manufacturer: Obtain gypsum board products from a single manufacturer, or from manufacturers recommended by the prime manufacturer of gypsum boards D. Allowable Tolerances: 1/8" in 8' - 0" variation in finish surface

1.4 DELIVERY, STORAGE, AND HANDLING

A. Deliver materials in original packaged, containers or bundles bearing brand name and identification of manufacturer or supplier B. Store materials inside under cover and in a manner to keep them dry, protected from weather, direct sunlight, surface contamination, corrosion and damage from construction traffic and other causes.

Neatly stack gypsum boards flat to prevent sagging.

C. Handle gypsum boards to prevent damage to edges, ends or surfaces. Protect metal corner beads and trim from being bent or damaged.

1.5 PROJECT CONDITIONS

A. Environmental Requirements, General: Comply with requirements of referenced gypsum board application standards and recommendations of gypsum board manufacturer, for environmental conditions before, during and after applications of gypsum board

B. Cold Weather Protection: When ambient outdoor temperatures are below 55 degrees Fahrenheit ., maintain continuous, uniform, comfortable building working temperatures of not less than 55 degrees Fahrenheit. for a minimum period of 48 hours prior to, during and following application of gypsum board and joint reinforcement materials or bonding of adhesives.

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C. Ventilation: Ventilate building spaces as required to remove water in excess of that required for drying of joint treatment material immediately after its application. Avoid drafts during dry, hot weather to prevent too rapid drying.

PART 2 PRODUCTS

2.1 MANUFACTURERS

A. Gypsum Board:

1. USG Corporation

2. G-P Gypsum Corporation

3. National Gypsum Company

4. Certainteed Corporation

5. Temple Inland

6. Or equal

B. Metal Support System:

1. Dietrich Metal Framing, Inc.

2. MarinoWare; a Division of Ware Industries

3. Or equal

2.2 NON-LOAD-BEARING STEEL FRAMING, GENERAL

A. Framing Members, General: Comply with ASTM C 754 for conditions indicated.

1. Steel Sheet Components: Comply with ASTM C 645 requirements for metal, unless otherwise indicated.

2. Protective Coating: ASTM A 653/A 653M, G60, hot-dip galvanized zinc coating, unless otherwise indicated.

2.3 STEEL FRAMING FOR FRAMED ASSEMBLIES

A. Steel Studs and Runners: ASTM C 645.

1. Double 20 gage stud framing at all openings including door and view panels.

2. 22 gauge at 16" o.c. for other locations.

3. Use 18 gauge for all runners.

B. Slip-Type Head Joints: Where indicated or at a minimum where required by the Steel Stud Manufacturers Association (SSMA), provide the following:

1. Double-Runner System: ASTM C 645 top runners, inside runner with 2-inch deep flanges in thickness not less than indicated for studs and fastened to studs, and outer runner sized to friction fit inside runner.

2. Deflection Track: Steel sheet top runner manufactured to prevent cracking of finishes applied to interior partition framing resulting from deflection of structure above; in thickness not less than indicated for studs and in width to accommodate depth of studs.

C. Hat-Shaped, Rigid Furring Channels: ASTM C 645.

1. Minimum Base Metal Thickness: 25 gauge

2. Depth: 1-1/2 inches unless otherwise noted.

2.4 STEEL FRAMING ACCESSORIES

A. Fasteners for Metal Framing: Of type, material, size, corrosion resistance, holding power, and other properties required to fasten steel members to substrates.

B. Provide stud manufacturer's standard clips, shoes, ties, reinforcement, and other accessories as needed for a complete partition framing system.

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2.5 GYPSUM BOARD MATERIALS

A. Gypsum Wallboard: ASTM C 1396, of types, edge configuration and thickness indicated below; in maximum lengths available to minimize end-to-end butt joints.

1. Types:

a. Regular, unless otherwise indicated.

2. Edges: Tapered.

3. Thickness: 5/8", unless otherwise indicated.

B. Tile Backer Board (provide at all locations where wall tile occurs and other areas indicated):

1. 5/8” Dens Shield Tile Backer Board as manufactured by Georgia Pacific Corporation.

2. 5/8” Fiber Brand Sheathing – Aqua Tough Tile Backerboard as manufactured by USG

Corporation.

3. Equal as approved.

2.6 TRIM ACCESSORIES

A. Interior Trim: ASTM C 1047.

1. Material: Sheet steel zinc coated by the hot dip process or electrolytic process, or sheet steel coated with aluminum.

2. Shapes:

a. Cornerbead: use at outside corners, unless otherwise indicated.

b. U-Bead: J-shaped; exposed short flange does not receive joint compound, use at exposed panel edges

c. Expansion (control) joint: One piece control joint formed with V-shaped slot and removable strip covering slot opening.

2.7 JOINT TREATMENT MATERIALS

A. General: Comply with ASTM C 475.

B. Joint Tape:

1. Interior Gypsum Wallboard: Paper.

2. Tile Backing Panels: As recommended by panel manufacturer.

C. Setting Type Joint Compound: Factory prepackaged, job mixed chemical-hardening powder products for bedding and filling, formulated for uses indicated.

1. For taping and filling only.

2. For prefilling gypsum board joints.

3. For filling joints and treating fasteners of mold and mildew resistant backing board behind base for ceramic tile.

4. For topping compound, use sandable formulation.

D. Drying-Type Joint Compounds: Factory prepackaged vinyl-based products complying with the following requirements for formulation and intended use.

1. Ready-Mix Formulation: Factory-mixed product.

2. All-purpose compound formulated for use as both taping and topping compound (use for finish

(third and above) coats only.)

E. Joint Compound for Tile Backing Panels: As recommended by backing panel manufacturer.

2.8 AUXILIARY MATERIALS

A. General: Provide auxiliary materials that comply with referenced installation standards and manufacturer's written recommendations.

B. Steel Drill Screws: ASTM C 1002, unless otherwise indicated.

1. Use screws complying with ASTM C 954 for fastening panels to steel members from 0.033 to

0.112 inch thick.

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PART 3 EXECUTION

3.1 PREPARATION

A. Do not deliver or install gypsum board until building is fully enclosed, wet work is complete, and HVAC system is operating and maintaining temperature and relative humidity at occupancy levels during the remainder of the construction period.

3.2 EXAMINATION

A. Examine substrates to which gypsum board construction attaches or abuts, installed hollow metal frames, cast-in anchors and structural framing with Installer present for compliance with requirements for installation tolerances and other conditions affecting performance of gypsum board assemblies specified in this Section.

1. Do not proceed with installation until unsatisfactory conditions have been corrected.

3.3 INSTALLATION

A. Metal Support Systems:

1. Wall/Partition Support System: Support systems shall extend from floor to heights indicated on partition types/schedule.

a. Install runner tracks at floors and bottom of roof or floor framing members and where stud system abuts other construction. Where partitions parallel, but are not directly beneath framing members, where there is no floor above, provide runner, or stud, headers between beams, spaced 4 feet on center, attached at each end, and secure top runner of partition thereto.

b. Space studs 16 inches on center, unless otherwise indicated.

c. Frame door openings with 20 gage vertical studs. Provide runner track header of same gage as jamb studs, and jack studs same as partition studs across head of opening.

d. Frame other openings same as door openings and frame above and below openings same as above door head.

e. Install supplementary framing, runners, blocking and bracing at openings and terminations in the work, and at locations required to support fixtures, equipment, services, heavy trim and similar work which cannot be adequately supported on gypsum board alone.

f. Secure perimeter framing to structural elements with suitable fasteners located 2 inches from each end and 24 inches apart between, except top runner parallel to, but not directly under, framing members will be attached with 2 screws to headers provided at 48 inches on center. Anchor studs adjacent to door and fixed light openings, partition intersections, and corners to top and bottom runner flanges. Make web-flange bend at each end of runner over openings and screw to jamb studs with 2 screws each end.

B. Gypsum Board

1. Install, fasten and finish gypsum wallboard and accessories in strict accordance with manufacturer's printed directions and recommendations, with GA-216.

2. Install gypsum board with face side out. Do not install imperfect, damaged or damp boards.

Butt boards together for a light contact at edges and ends with not more than 1/16" open space between boards. Do not force into place.

3. Locate edge and end joints over supports. Position boards so that both tapered edge joints abut, and mill-cut or field-cut end joints abut. Do not place tapered edges against cut edges or ends.

4. Space fasteners in gypsum boards in accordance with referenced standards and manufacturer's recommendations, except as otherwise indicated.

a. Fasten base layer to metal supports with screws, spaced 12" o.c. along supported edges and 24" o.c. along intermediate supports.

b. Fasten single layer and face layer to metal supports with screws, spaced 12" o.c. for 24" stud spacing and 16" o.c. for 16" stud spacing, unless otherwise indicated. Stagger screws on abutting edges and ends.

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C. Trim Accessories

1. General: Where feasible, use the same fasteners to anchor trim accessory flanges as required to fasten gypsum board to the supports. Otherwise, fasten flanges by nailing or stapling in accordance with manufacturer's instructions and recommendations.

2. Install metal corner beads at all exposed external corners of gypsum board work.

3. Install metal edge trim when edge of gypsum board would otherwise be exposed or semi-exposed and where work is tightly abutted to other work.

4. Control Joints:

a. Install control joints at locations indicated, or if not indicated, at spacings and locations required by ASTM C 840 and manufacturer's recommendations; and approved by Contracting Officer for visual effect.

1) Provide not more than 30 feet apart on walls and ceilings.

3.4 FINISHING OF GYPSUM WALL BOARD

A. General: Apply joint treatment at gypsum board joints (both directions); flanges of corner bead, edge trim and control joints; penetrations; fastener heads, surface defects and elsewhere as required to prepare work for decoration.

B. Prefill open joints using setting-type joint compound.

C. Apply joint tape at joints between gypsum boards, except where trim accessories are indicated.

D. Finish interior gypsum wallboard by applying the following joint compounds in three coats (not including prefill of openings in base), sand between coats, and after last coat.

1. Embedding and First Coat: Setting-type joint compound.

2. Fill (Second) Coat: Setting-type joint compound.

3. Finish (Third) Coat: Ready-mix drying all-purpose or topping compound.

E. Glass-Mat Water Resistant Backer Board: Comply with glass mat backer board manufacturer’s recommendations.

F. Partial Finishing: Omit third coat and sanding on concealed drywall construction indicated for drywall finishing or which requires finishing to achieve sound rating.

G. Levels of Finish: Provide in accordance with Gypsum Association GA 214, “Recommended Levels of Gypsum Board Finish”.

1. Level 1: Concealed areas, except provide higher level of finish as required to comply with acoustical ratings.

a. All joints and interior angles shall have tape set in joint compound. Surface shall be free of excess joint compound. Tool marks and ridges are acceptable.

2. Level 2: not used

3. Level 3: not used

4. Level 4: all Gypsum board surfaces, except where another finish level is indicated.

a. All joints and interior angles shall have tape embedded in joint compound and two separate coats of joint compound applied over all flat joints and one separate coat of joint compound applied over interior angles. Fastener heads and accessories shall be covered with three separate coats of joint compound. All joint compound shall be smooth and free of tool marks and ridges.

5. Level 5: not used.

3.5 PROTECTION

A. Protect installed products from damage from weather, condensation, direct sunlight, construction, and other causes during remainder of the construction period.

B. Remove and replace panels that are wet, moisture damaged, and mold damaged.

1. Indications that panels are wet or moisture damaged include, but are not limited to, discoloration, sagging, or irregular shape.

2. Indications that panels are mold damaged include, but are not limited to, fuzzy or splotchy surface contamination and discoloration.