1.01 Referenced Documents

Division O - Contract requirements and Division 1 - General conditions are hereby made a part of this section.

1.02 Description of Work

Work included:

Manufacturer to furnish all labor, materials, equipment, and related services for the manufacture of GFRC - Glass Fiber Reinforced Cement. Exterior architectural shapes as shown in the contract documents and as specified herein, including:

Column enclosure and capitals

Decorative moldings

Exterior window units

Window sills

Spandrel panels

Domes, vaults and coffers

Installer to furnish all labor, materials, equipment, and related services for the installation of GFRC - Glass Fiber Reinforced Cement in accordance with manufacturer’s recommendations and as described by contract documents, including:

Metal supports, anchorages, suspension systems and adhesives/sealants

Preparation of prefabricated GFRC members for work of other trades

Finishing joints and fastener concealment

Expansion joints

Related work specified in other sections:

Steel and sheet metal fasteners, plates, blocking, furring, shims, angles, and any miscellaneous fasteners as per manufacturer’s requirements. Brackets, framing and other embedded items as specified by architects and/or contractor.

Painting

Applied finishes

Furnishing and installation of electrical items which occur in prefabricated GFRC members, Division 15

Furnishing and installation of electrical items which occur in prefabricated GFRC members, Division 16

1.03 Quality Assurance

A. Manufacturer: Provide material produced by a GFRC manufacturing firm with not less than five (5) years of successful experience in the fabrication of 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 GFRC products shall be of US origin and shall have been manufactured in the USA.

Approved manufacturer: Prefabricated GFRC members shall be as manufactured by Custom Castings Northeast, Inc., 2000 N. Atherton Street, State College, PA 16803 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 ten (10) calendar days prior to bid date. Request must include test data and sample submittals. If approval is granted, an addendum 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.

5. Manufacturer must be able to show that he has experienced personnel, physical facilities established quality control procedure sand management capability required to produce parts of quantity and quality specified within scheduled delivery requirements.

6. When requested, the manufacturer shall submit evidence of the above requirements to the architects.

Erector Qualifications: Erector must have completed at least five (5) projects of similar scope and quality of this project. Erector must show that he has management capability and experienced personnel required to erect the GFRC pieces as shown on approved shop drawings, and as installation requirements.

1.04 Submittals

A. Product data: Submit copies of the manufacturer’s literature and/or brochures describing prefabricated GFRC members, recommended joint treatment, and fastener concealment methods, anchors, adhesives, sealants, and test data showing compliance with specified requirements.

Product certification: submit manufacturer’s certificate stating that product composition includes Portland cement, long-strand continuous filament glass fibers, a high impact resistant material, and that each unit is free of combustible content. Chopped glass and/or synthetic space-age fibers may be used at areas with fine details.

Shop drawings: Submit shop drawings detailing prefabricated GFRC members, including locations, size and shape of members, anchorages, supports, suspension details, and joint conditions which are to be corporated into the members. Also, show the relation of GFRC members to light fixtures, ceiling diffusers, outlet boxes and other items which occur in, or are affected by, the GFRC members. Openings for work of other trades will be located and cut on the job site unless indicated on approved shop drawings.

D. Samples: Submit a minimum of (3) 8" x 11" flat samples with any special surface texture requirement, to the architect for review of workmanship and finish.

Mockups: after approval of product data, test data, shop drawings, and samples, and prior to production, prepare one full size mockup of representative members to be installed by installation contractor. Mockups should demonstrate joint conditions, and include a representation of any anchorages, supports, or suspension systems incorporated in the member. Installer will coordinate installation of mockups with other related work. Production of GFRC will begin after receipt of written approval for mockups. Approved mockup members may be incorporated into the job.

1.04 Product Delivery, Storage and Handling

1. Handling and delivery: All members will be supported during shipment on shock absorbing material. Place nonstaining resilient spacers between members and crating. Unload members and lift them in a manner consistent with their designed support points.
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 GFRC members with work of other trades.

1.07 Warranty

The manufacturer of the prefabricated GFRC members and the contractor shall jointly warrant prefabricated GFRC 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, Custom Castings Northeast, Inc. 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 GFRC 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

Part II - Products

2.01 Prefabricated Glass Fiber Reinforced Cement (GFRC)

1. Description: Glass Fiber Reinforced cement of required thickness and shapes (as indicated on drawings). Include all required connections, reinforcements, provisions for work of other trades (as indicated on approved shop drawings).
2. Approved manufacturer: Prefabricated GFRC members shall be as manufactured by Custom Castings Northeast, Inc., 2000 N. Atherton Street, State College, PA 16803 814-234-8612, FAX: 814-234-8745

 

1. Tolerances (Fabrication)

1. Dimensional all directions: +/- 3/16"
2. Thickness, skin3/8", +/1 1/8"

   3. Warpage or bowing: +/- 1/8" across the diagonal

2.03 Related Materials

1. Embedded steel frame system shall be a welded prefabricated frame produced in accordance with approved shop drawings.
2. Steel framing shall be of materials and workmanship equal to the requirements of AISC, AISI, and Metal Lath Steel Framing Association for light gauge steel frame members.
3. Steel frame members shall be as specified by manufacturer for the particular application
4. Joint treatment materials:

1. All hidden exterior joints to be reinforced with fiberglass joint tape.
2. Bedding materials shall include bonding agent and grout mix as recommended by manufacturer. Grout material to match units in color and texture. Grout materials shall be applied as recommended by GFRC manufacturer or bonding agent manufacturer.

1. Miscellaneous materials

1. General: provide auxiliary materials of types and grades recommended by manufacturer for work.

2. Adhesive: Dow Jones 795, conforming to Specification #TT-S-00230C, Class A or Polyurethane sealant meeting specification #TT-S-00230C, Type II or approved equal.

3. All fasteners will be galvanized or plated finish. Stainless steel fasteners will be used at any exposed face penetrations.

2.04 Fabrication

1. Molds: fabricate molds for GFRC members as shown on approved shop drawings and samples. Molds are to be acquired from existing pieces where necessary.
2. Preparation for work of other trades: include all blockouts, reinforcements and supports for work of other trades as indicated on approved shop drawings.
3. Lamination: mix cement with polymer additive and fine aggregate to provide finished mixture of required material characteristics. Laminate cement mixture and layers of long-strand continuous filament glass material including high impact resistant material, to desired thickness. Areas with small details and protrusions will be laminated with chopped glass, or synthetic fibers are required before application of glass fiber materials.
1. Curing: GFRC members will be stored under controlled conditions for a sufficient period of time to insure product stability before shipment. Contractor is to place order in sufficient time to allow for proper curing at the point of manufacture.

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

2. Sealing and/or coating should be done only after GFRC and any joint or patching compound has cured for a minimum of 30 days, or as recommended by the manufacturer.

Part III - Execution

3.01 Inspection

1. The general contractor shall be responsible for providing lines, centers, grades and elevations as required to properly locate and install GFRC members.
2. Then general contractor shall notify the GFRC manufacturer within 30 days of delivery of any discrepancies.
3. Prior to installation, installer will verify reference installation of GFRC members provided by the contractor. Any discrepancies between design dimensions and field dimensions that alter or adversely affect the proper installation of GFRC members will be brought to the attention of the Contractor. Any discrepancies will be resolved before installation begins. The manufacturer shall not be liable for discrepancies unless notified in writing within thirty (30) days of delivery.

3.02 Installation

1. Coordinate installation with work of other trades. Layout GFRC members from reference points and elevations provided by the contractor.
2. Installer will use only experienced workmen in handling and installing GFRC members.

 

Page 6

3. All members shall be installed level, plumb, square and with proper spacing within allowable tolerances. All joints will be properly aligned with uniform joint width as shown on approved shop drawings with allowance made to prevent overall dimensional error. Each member shall be securely fastened in place as indicated on approved shop drawings. Adjustments or changes affecting allowances for panel expansion and contraction shall not be permitted without approval by the manufacturer.
4. Erection Tolerances:

1. Face width of joint+/- 1/4"
2. Out of plane (unit to unit)+/- 3/16"
3. Warpage or bowing+/- 1/8"

1. Finishing joints and fasteners:

1. Apply backer rod and sealant at expansion joints as shown on approved shop drawings.

1. Apply fiberglass tape and joint compound at reinforced joints at locations as shown on approved shop drawings. Apply construction adhesive to mating surfaces and band or brace together until adhesive cures. Apply bonding agent joint compound and fiberglass tape as recommended by the Manufacturer.
2. Apply bonding agent and joint compound as recommended at fastener heads, surface defects and elsewhere as required to prepare work for finish decoration.

3.03 Protection of Work

The installer shall be responsible during and after installation for protecting the GFRC members from damage by other trades as necessary until accepted by the Contractor.

3.04 Repairs and Replacement

1. The Manufacturer will repair or replace any defective GFRC members at its discretion subject to approval by the Architect.
2. Installer will repair or replace GFRC members damaged on the jobsite as recommended by the Manufacturer.

3.05 Adjustments and Cleaning

1. Clean exposed surfaces of GFRC members and adjacent surfaces soiled or damaged during the work of this section.
2. Clean up all debris caused by the work of this section, keeping the premises clean and neat at all times.

3.06 Damage and Repairs

After installation is completed and any damaged panels are repaired, inspected and accepted, any further damage is the responsibility of the General Contractor.

Rev. 9/97

Material Characteristics - GFRC

1. Shell thickness 3/8" (field area)

1/2" (attachment pts)

2. Weight (depending

on reinforcement) 3.5 lb/sq ft.

3. Flexural strength1900 psi +/- 10% (ASTM C945)
4. Compressive strength8300 psi +/- 10% (ASTM C109)
5. Density117 lb/ft +/- 10%
6. Flammability (ASTM E84)Class 1 (ASTM E84)
7. Rockwell Hardness "L" Scale95.4 ASTM D-785
8. Barcol Hardness90.8 ASTM D-2583

Home   |  Material Specs   |  Photo Gallery   |  About Us   |  Contact Us

Top