1.01 Summary

Section includes Glass Reinforced Gypsum (GRG) for application(s).

A. Related sections:

Gypsum drywall systems: elsewhere in Division 9

Painting of the GRG: elsewhere in Division 9

1.02 Submittals

1. Product data: Submit three (3) copies of the manufacturer’s literature and/or brochures indicating successful completion of similar size projects
2. Shop drawings: Submit drawings detailing GRG material including locations, size and shape of GRG members, anchorages, supports, suspension details, and joint conditions which are to be incorporate into the GRG members.
3. Samples: Submit three (3) samples of GRG material indicating typical joint detail and attachment points. Samples shall indicate typical horizontal and vertical joints. Samples size to be 12" x 12".
4. Test Data: Submit test data from certified independent testing laboratories establishing compliance with contract requirements. All test data submitted shall have been performed by independent testing agencies employed by the GRG manufacturer of the finished product under this own trade name. Tests shall be those recommended by CISCA (Ceilings & Interior Systems Construction Association) for the GRG industry.
5. Product Certification: Submit Manufacturer’s Certification stating that the GRG product includes: the use of high density gypsum cement and the use of continuous filament glass fiber mats, free of asbestos and resinous additives. Each unit shall be free of any combustible material.

Note: Manufacturers Certification shall be included with the proposal attesting to product compliance.

6. Warranty: The manufacturer of the prefabricated glass reinforced gypsum members and the contractor shall jointly warrant prefabricated glass reinforced gypsum members to be free from defects in materials and workmanship for a period of two (2) years from date of substantial completion of the project and if defects in materials and/or workmanship should appear within the stated period of warranty, the Manufacturer shall replace same without additional cost to the owner. The Manufacturer’s Warranty shall be limited to replacement of defective materials and Contractor shall install replacement items without additional cost to the owner or manufacturer. Warranty shall be based on installation methods in conformance with manufacturer’s recommendations and instruction. The Manufacturer’s warranty shall not cover damage to gypsum members caused by structural, mechanical, electrical defects, and/or defects of adjacent materials furnished and installed by other trades. Warranty required herein is the sole remedy against the Manufacturer and there are not other implied warranties. In any event, the Manufacturer shall not be liable for incidental or consequential damages

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1.03 Quality Assurance

1. Manufacturer: Provide material produced by a GRG manufacturing firm with not less than five (5) years of successful experience in the fabrication of glass reinforced gypsum products under that manufacturers own trade name. The manufacturer shall have in place, a documented management quality assurance program. The manufacturer shall identify the quality assurance program in place and shall permit review of the documentation ascertaining the methodology of quality assurance. All GRG products shall be of US origin and shall have been manufactured in the USA.

1.04 Product Delivery, Storage and Handling

1. Deliver, store and handle prefabricated glass reinforced members in conformance with manufacturer’s instructions.
2. Storage: store members to protect them from weather, contact with soil or dirt, staining, and physical damage. Store inside in an upright position (not leaning) on a flat, level and smooth service. Protect members from excessive moisture or humidity.

1.05 Job Conditions

1. Coordinate, deliver and installation of prefabricated glass reinforced gypsum members with work of other trades.
2. Do not proceed with installation of prefabricated glass reinforced gypsum member until building(s) is/are sufficiently enclosed and ambient conditions are adequately controlled to prevent moisture and weather deterioration of prefabricated glass reinforced gypsum members. A uniform temperature of at least 45 degrees shall be maintained before, during and after installation of prefabricated glass reinforced gypsum members.

Part II - Products

2.01 Manufacturer

1. Approved manufacturer: Prefabricated glass reinforced gypsum products shall be as manufactured by Custom Castings Northeast, Inc., 2000 N. Atherton Street, State College, PA 16803
2. 814-234-8612, FAX: 234-8745

Substitutions:

1. Proposal shall be based only on the specified product.

2. Alternate proposals for substitute products and/or substitute manufacturers will not be accepted unless approved in writing via written addenda.

3. Request for approval to submit an alternate must be made a minimum of fourteen (14) calendar days prior to bid date. Request must include test data and sample submittals. If approval is granted, an addenda will be issued, so stating, a minimum of seven (7) calendar days prior to bid date.

4. The manufacturer of any proposed substitutions shall have completed at least five (5) projects of the scope and quality required by the contract documents for this project.

 

 

 

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2.02 Material

1. Glass Reinforced Gypsum (GRG) shapes made from asbestos-free, high-density gypsum reinforced with a continuous filament random fiber mat with the following minimum physical characteristics:

1. Shell thickness3/16" (field area)

1/2" (attachment pts)

2. Flexural strength3600 lb/sq inch (ASTM C947)
3. Impact strength13 lb/sq inch (ASTM D256-87)
4. Compressive strength10000 lb/sq inch (ASTM C109-87)
5. Barcol hardness or84 (ASTM D2583-87)

Rockwell hardness 95 (ASTM D785)

6. Density103-110 lbs/cubic feet
7. Flammability0 Flame spread (ASTM E84)

0 Smoke spread (ASTM E84)

Class 1 (ASTM E84)

8. Weight1.5 lbs per square feet

Subject to increase with reinforcement

9. Humidified deflection1/16" (ASTM C473)
10. Thermal Expansion1.17 X 10/F (ASTM D696)

2.11 X 10/C (ASTM D696)

1. Tolerances (Fabrication)

1. Dimensional all directions: +/- 1/8"
2. Thickness:(field area) +/- 1/16"

(control thickness) +/- 1/16" @

Attachment points

3. Warp or bow: +/- 1/16" l.ft.

Internal Standards Organization (ISO)

2.03 Material Related With Prefabricated Glass Reinforced Gypsum Members.

1. Non-galvanized steel shapes: ASTM A-36 of required sizes and shapes. Apply shop coats of zinc primer.
2. Galvanized steel shapes: Minimum 16 gauge of required sizes and shapes, fabricated from zinc coated commercial quality carbon steel sheets with minimum of .20% copper content complying with ASTM C-526.
3. Anchors and fasteners:

1. Bolts: ASTM A-307 of required sizes.

1. Self tapping metal screws: comply with Gypsum Association GA-216 of required sizes. Use Milcor TITE-LOK type fasteners for application of light-gauge framing members.

1. Suspension system components:

1. Hanger wire: not less than 12-gauge galvanized steel wire, ASTM C-641, soft temper, restretched, Class I coating.
2. Lathing channels: 3/4" and 1 1/2" "C" shaped 16-gauge cold rolled lathing channels, asphalt painted with manufacturer’s standard coating.
3. Drywall hat-shaped furring channels: same as hat-shaped United States Gypsum Company DWC furring channel.
4. Tie wire for attachment of channels: Same as hangers only soft annealed 16-gauge tie wire.

1. Joint treatment materials:

1. General: ASTM C-475; type recommended by the manufacturer for the application indicated, except otherwise indicated.
2. Joint tape: perforated type
3. Joint compound: ready mix vinyl-type for interior use.

Grade: two separate grades; one specifically for bedding taped and filling depressions, and one for topping and sanding.

1. Miscellaneous materials

1. General: provide auxiliary materials for work of types and grades recommended by manufacturer.
2. Adhesive: special adhesive recommended for laminating gypsum plaster.

2.04 Fabrication

1. Molds: fabricate molds for prefabricated glass reinforced gypsum members to required sizes and shapes with linings for smooth finished surfaces ( textured surfaces as indicated on contract drawings), without waves, warp, or distortions of any kind. Molds shall be of such composition as not to affect reinforced gypsum and to maintain shapes during mixing and placement of reinforced gypsum and inserts.
2. Preparation for work of other trades: include all blockouts, reinforcements and supports for work of other trades as indicated on approved shop drawings. Laminate areas of small details and protrusions with chopped glass as required. Laminate reinforcement, embeds end supports as shown in approved shop drawings

 

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1. Lamination: mix gypsum cement and additives to provide gypsum mix of required material characteristics. Laminate gypsum mixture and layers of long-strand continuous filament glass mat to required thickness in shapes and sizes as detailed in approved shop drawings.
2. Curing: after placement of gypsum and glass fiber reinforcement in molds, and after gypsum has set and become hard, remove from molds and store for curing and aging, under proper conditions of temperature and moisture.

B. Identification: mark each unit on unexposed side, in accordance with marks established on approved shop drawings.

PartIII- Execution

3.01 Inspection

Installer shall inspect areas and conditions under which prefabricated glass reinforced gypsum members are to be installed and notify the contractor of any unsatisfactory conditions. Do not proceed with installation until unsatisfactory conditions have been corrected in a manner acceptable to the installer.

3.02 Preparation

Coordinate installation with work of other trades. Verify reference points and elevations provided by the contractor of installations of gypsum members. Layout gypsum members from reference points and elevations provided by the contractor. Refer any discrepancies to the contractors.

3.03 Installation

1. General: install prefabricated glass reinforced gypsum members in required locations, plumb, level, sloped and square, in required planes with related surface, securely anchored in place.
2. Columns

1. Secure base of columns to floors with clip angles.
2. Spread adhesive over back of joint flange. Secure framing member to the vertical joint allowing ½ to extend beyond the vertical edge. Secure with standard drywall screws. Position the second section of the column enclosure in place and pull tight at the joint line. Secure this section with standard drywall screws, same as the first section.
3. Tape joint may be immediately finished if necessary. Tape and float seams, joints and fasteners. Sand smooth exhibit one-piece construction ready for field painting.

1. Ceiling panels:

1. Install hangers and supporting members as indicated on drawings. Provide powder actuated fasteners driven into overhead structural supports as anchorage for top ends of hangers. Space hangers as required with a minimum of four (4) hangers for each segment of prefabricated glass reinforced gypsum members. Install channels and other framing members as detailed. Securely wire tie or bolt together for secure installation. Attach gypsum members to framing members with anchors and fasteners as detailed. Coordinate installation of prefabricated glass reinforced gypsum members with related mechanical and electrical work.

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1. Joints: securely anchor adjacent units with adhesive and anchors as detailed and in a manner similar to that specified for joints in column covers, ready for taping and sanding.

C. Finishing joints and fasteners:

1. Apply treatment to joints, fastener heads, surface defects and elsewhere as required to prepare work for decoration. Prefill open joints and rounded or beveled edges. Apply joint tape at joints between units.
2. Apply joint compound in three coats, and sand between last two coats and after last coat.

3.04 Adjustment and Cleaning

1. Remove and replace any defective prefabricated glass reinforced gypsum members.
2. Clean exposed surfaces of gypsum members and adjacent surfaces soiled or damaged ruing the work of this section.
3. Clean up all debris caused by work of this section, keeping the premises clean and neat at all time.

Rev. 9/97

Material Characteristics - GRG

1. Shell thickness 3/16" (field area)

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