|Whether your next design project is restoration, new construction, or high-end residential, HYDROCAL® FGR Gypsum Cement from United States Gypsum Company can open the door to many three-dimensional possibilities. A great variety of finished items, formerly made from conventional plaster, wood, concrete, stone, and other materials, can be duplicated at less cost using the unique properties of HYDROCAL FGR Gypsum Cement.
Used for Glass-Reinforced Gypsum (GRG) fabrication, HYDROCAL FGR Gypsum Cement is an alpha-hemihydrate gypsum-based material that has a low water demand. This results in high strength, high density pieces that can be fabricated for a variety of architectural applications, such as column covers, light coves, wall and ceiling moldings, cornices, coffers, and more. And because it is made by a company with over 100 years of experience in the building industry, you can be sure that you are getting the best product available.
HYDROCAL FGR Gypsum Cement sets fast, develops high strength, and permits fabrication of strong, resilient glass-reinforced gypsum products. These durable products are fire-resistant, are adaptable to deep patterns, accept most coatings, help overcome the building fire code problems of many plastics, and cost about 2/3 less than filled polyesters.
And the design possibilities are endless: The economical price and fabrication flexibility allow you to duplicate existing pieces for renovation projects or create your own masterpieces quickly and easily.
specification for HYDROCAL FGR Gypsum Cement is a guide in the preparation
of a specification which can be adapted to specific projects and conditions.
These specifications are not intended to cover every possible job condition,
but rather to assist in preparation of specifications.
- A. Gypsum board
systems. Section ________.
- B. Paint systems.
- C. Acoustical systems.
- D. Plaster systems.
- E. Work installed
but furnished under other sections. Section ________.
- F. Work furnished
but installed under other sections. Section ________.
- A. Subcontractor
qualifications: Part manufacturer shall have not less than three years
of successful experience in the manufacturing and molding of glass-reinforced
gypsum. Installer shall have not less than three years successful experience
in the installation of the specified work and be acceptable to the part
- B. Requirements
of regulatory agencies: Codes and regulations of authorities having
under review by ASTM.
- A. ASTM C11: Terminology
relating to gypsum and related building materials and systems.
- B. ASTM CXXX/XXXM1:
Standard Specification for FGR Glass and Fiber Reinforced Gypsum Parts.
- C. ASTM CXXX/XXXM1:
Standard Specification for Molded Glass Fiber Reinforced Gypsum Parts.
- D. ASTM E84: Test
Method for Surface Burning Characteristics of Building Materials.
- E. CISCA "Glass
Reinforced Gypsum, A Guide."
- A. System details:
Submit manufacturer's catalog cuts, literature of standard drawings
showing details of the system with product conditions clearly identified,
and manufacturer's recommended installation instructions.
- B. Shop drawings:
Submit full, complete detailed shop drawings for all Hydrocal FGR Gypsum
Cement construction. Submit shop drawing details and reflected ceiling
plans if necessary, to indicate ceiling modules and related lighting
and mechanical systems. Show dimensional location of framing and support
details for Hydrocal FGR Gypsum Cement items supported by suspension
- C. Samples: Submit
Hydrocal FGR Gypsum Cement panel finishes to architect for acceptance.
Delivery, Storage, and Handling
- A. Raw materials:
All raw materials, except water, shall be delivered and stored in their
original unopened packages in an enclosed shelter providing protection
from damage and exposure to the elements. Damaged or delivered materials
shall be removed from the premises.
- B. Finished materials:
- 1. Deliver
materials in original unopened containers, clearly labeled with
manufacturer's name, item description, specification number, type,
and class, as applicable.
- 2. Storage
time on the job site should be as short as possible, and environmental
conditions should be as near as possible to those specified for
occupancy. Excess humidity during storage can cause expansion of
the installation. Chemical changes in the reinforcement mat and
coating can be aggravated by excess humidity and cause discoloration
when storing even unopened containers. Damaged or deteriorated materials
shall be removed from the premises. Immediately before installation,
store items at a location where temperature and humidity conditions
duplicate ambient during installation and anticipated for occupancy.
- 3. Installation
conditions should be at or near those under standard occupancy conditions
of temperature and humidity 60-85°F (16-29°C), no more than
70% relative humidity.
- 4. Handle in
such a manner as to ensure against racking distortion or physical
damage of any kind.
- A. Existing conditions:
(Include specific alteration work to be completed for project.)
- B. Environmental
requirements: Building shall be enclosed with all windows and exterior
doors in place and glazed, and the roof watertight before installation
of Hydrocal FGR Gypsum Cement systems. Wet work shall be in place, completed
and nominally dry with HVAC system in continuous operation. Maintain
climate conditions to range from 60-85°F (16-29°C) and relative
humidity of not more than 70% before installation of Hydrocal FGR Gypsum
- C. Coordination
with other work:
- 1. Coordinate
with other work supported by or penetrating through ceiling, including
mechanical and electrical work and partition systems.
- 2. Duct work
above suspension system and behind wall systems shall be complete
and permanent heating and cooling systems operating.
- 3. Installation
to conduit above suspension system and behind wall systems shall
be complete before installations of Hydrocal FGR Gypsum Cement System.
- D. Protection:
Protect all completed Hydrocal FGR Gypsum Cement system work from damage.
1.01 Manufacturer and Materials
- A. Alpha-calcium
sulfate hemihydrate plaster: Hydrocal FGR-95 or 115 Gypsum Cement as
manufactured by United States Gypsum Company, Industrial Division Division,
Chicago, Illinois, U.S.A.
- B. Glass fiber
reinforcement: "E" glass fiber (3Ú49 long chopped glass fiber
strands or continuous strand mats of calcia-alumina silicate glass) which
conforms to test method D578.
- C. Water: Potable
without impurities that affect the setting of gypsum cements.
- D. Mixing
- 1. Combine
and mix Hydrocal FGR Gypsum Cement to water according to United
Stated Gypsum Company's recommendations to form a slurry.
- 2. Combine
the slurry with not less than 5% by weight glass fiber reinforcement
to form the architectural detail not less than 1/8" in thickness.
- E. Accessories
- 1. Fasteners
and inserts: As recommended by the engineer and or fastener manufacturer
for specific application.
- 2. Adhesive:
As recommended by manufacturer where required.
- 3. Sealant:
Sheetrock® brand Acoustical Sealant.
- 4. Joint treatment:
See Product Folder SA927 Gypsum Panels & Accessories. Sheetrock
Joint Tape Sheetrock Fiberglass Drywall Tape Sheetrock Setting-Type
(Durabond®) or Lightweight Setting-Type (Easy Sand) Joint
- F. Performance:
- 1. Shell thickness
minimum 1/8" thickness.
- 2. Surface
burning characteristics: Material shall be noncombustible having
a flame spread/smoke developed values less than 0/10.
- A. Installer must
verify actual field dimensions prior to installation.
- B. Install in accordance
with CISCA recommendations, and local building codes.
- C. Install in accordance
with manufacturer's current printed recommendations.
- D. Install all
Hydrocal FGR Gypsum Cement panels true plumb and level and in accordance
with approved shop drawings.
- E. Fasteners as
recommended by fastener manufacturer for specific job conditions.