Large GRC (glass fiber reinforced concrete) domes are generally cast in pie shaped segments, and assembled on-site. If the dome is a decorative element to be viewed from the exterior only, the roof is put in place, and the dome placed above it. Similarly if the dome is to be viewed from the interior only, it may be suspended from the ceiling structure above it. If the domes are to be viewed from both the interior and the exterior than a double dome is required with insulation placed between the inner and outer dome. Exterior glass reinforced concrete domes may be molded smooth or textured, with ribs or even with the molded in shape of roof tile, or glazed mosaic tile. Interior domes in GRC (glass fiber reinforced concrete) may be smooth, ribbed, or coffered. In some applications both an exterior dome of GFRC or fiberglass, and an interior dome of GFRC or fiberglass are used. Between the inner dome and outer dome, the dome cavity may be insulated.
What is GFRC and what is a GRC dome?
GFRC (glass fiber reinforced concrete) is concrete that uses glass fibers for reinforcement instead of steel. It is typically cast in a thin section of around 1/2″ to 3/4″. Since the fibers cannot rust like steel, there is no need for a protective concrete cover thickness to prevent rusting. With the thin, hollow construction of GFRC products, they can weigh a fraction of the weight of traditional precast concrete or stone.