Fiberglass Reinforced Gypsum domes

Glass Fiber Reinforced Gypsum, is also referred to as Fiberglass Reinforced Gypsum (FRG) and Glass Reinforced Gypsum (GRG).

Stromberg GFRG domes are cast in a composite of high-strength gypsum and glass fibers, which can be factory molded into virtually any size or shape. The versatility of GFRG allows it to create beautiful domes with smooth sweeping curves, or intricate details.

Stromberg GFRG domes are lightweight and strong

Basic GFRG Dome Facts

  • Thickness of Stromberg GFRG domes varies between 1/8" and 3/16" (3 to 5 mm). Edges are slightly thicker.
  • Stromberg GFRG domes weigh just 2 to 3 pounds per square foot. (10 to 15 kg/square meter)
  • Stromberg GFRG is a 100% noncombustible mineral composite. It will not burn.
  • The cast GFRG dome finish can be a smooth white plaster to be painted on site or a stone texture.
  • Stromberg GFRG domes provide relatively quick and easy installation.
  • GFRG domes are suitable for historical restoration or new projects.
  • Stromberg produces both standard and custom GFRG domes.
  • Dome designs can be complex or simple, traditional or contemporary.
  • Stromberg offers no obligation dome design and detailing assistance.


GFRG domes can be used wherever a light, strong and fire retardant material is required

  • Casinos
  • Fine Restaurants
  • Hotels and Resorts
  • Religious Buildings
  • Theaters
  • Residential

GFRG Domes: Color and texture options.

  • Smooth plaster, to be field painted
  • Metallics: Bronze, gold, gold leaf, copper, aged bronze, aged copper, nickel and custom metallic.
  • Stone: limestone, sandstone, marble, granite and custom stone.
  • Colors: Any color from any paint chart.
  • Textures: smooth, aged metal, stone, travertine, distressed, mosaic tile, wood grain and custom textures.
  • Custom: Have something else in mind? Give us a call, we can match it.

Other GFRG Design Elements

To compliment the GFRG domes, Stromberg also produces GFRG:

  • Moldings
  • Ceilings
  • Columns
  • Light coves
  • Bas Relief Sculpture
  • Capitals
  • Fireplace Surrounds
  • Medallions
  • Custom shapes

Manufacturing process for a custom GRG dome

  1. From the architect's drawings or designers images, Stromberg CAD department generates shop drawings showing parts and installation.
  2. Once the shop drawings approved, a combination the latest computer-driven CAM equipment as well as old-fashioned artistic skill produces the model of the dome from which molds will be made.
  3. Accurate molds are produced from the dome models.
  4. High-strength gypsum and glass reinforcing fiber is cast into the molds. The casting process applies a fiber free face coat into the mold first and then the glass fiber reinforced backing.
  5. When the fiber reinforced gypsum has hardened, the parts are removed, cleaned and dried
  6. The details are carefully checked as part of a multi step quality inspection.
  7. The dome is packaged for shipment.

GFRG Dome Installation:

Installation: Installation methods for GFRG domes vary depending upon the location and the ceiling construction. In suspended ceilings, GFRG ceiling domes may be suspended from hanger wire similar to a suspended ceiling. In wood or metal framed ceilings the GFRG dome can be attached to the framing with screws. The screws are then countersunk and filled over.

Small domes are supplied as one piece. Larger GFRG domes are supplied in pie shaped sections.

GFRG Dome Terminology

Glass Fiber Reinforced Gypsum, is also sometimes referred to as Fiberglass Reinforced Gypsum, FRG and as Glass Reinforced Gypsum or GRG.

Custom GFRG Dome Design Criteria

Here are some design considerations for using GFRG in your project:

  • Detail. GFRG can reproduce intricate details or smooth sweeping curves.
  • Size. GFRG can be cast in pieces up to 28' in length. The longer the length, the more difficult it is to handle and ship the GFRG casting. We recommend a maximum length of 12' for most dome segments. If longer lengths are required, pieces can be field joined in a seamless manner. Contact us for GFRG jointing details.
  • Surface Finish. The lowest priced finish is usually a plain smooth GFRG. It is generally finished with a flat latex paint. If you intend to use a gloss finish, the GFRG will need some field priming and prep work.
  • Special Reinforcements. GFRG domes may have rods, angles, straps, hanging wires or studs cast into the back of the casting for reinforcement and attachment.