Royal Corinthian -RoyalCast™ Composite Fiberglass Columns


Material Composition and Process

Typically Calcium Carbonate is the main filler used in RoyalCast™ columns.

Category: exterior columns | framing products | porch posts...

MasterFormat: Precast Concrete | Precast Structural Concrete | Precast Architectural Concrete...

Royal Corinthian
603 Fenton Ln
West Chicago, IL 60185
Tel: (888) 265-8661
Fax: (630) 876-3098

Find a rep/distributor

Request More Info


Related Products


RoyalCast™ Composite Fiberglass Columns

Material Composition and Process

Typically Calcium Carbonate is the main filler used in RoyalCast™ columns. Calcium carbonate is essentially fine particles of crushed rock that when mixed with polyester resin, industrial glue essentially, solidifies or cures into a hard stone-like substrate. Essentially these hollow columns, a result of the rotational manufacturing process, will sound like you are knocking on thin stone. When projects call out for Class A fire rated columns, Alumina Trihydrate or ATH is mixed in with the Calcium Carbonate to form filler that meets the ASTM E 84 Class A test method for surface flame spread and smoke density. Without ATH, the columns will still pass the flame spread Class A test but fail the smoke test, which typically isn’t of concern in the exterior use of columns. Even though our RoyalCast™ fiberglass columns are robust, they are still considered a lightweight column (ranging from 46 lbs. to 4000 lbs. depending on column size). In instances where someone wants these composite columns even lighter, we substitute lightweight filler which decreases the column weight by approximately 50%, while maintaining the same material thickness. So a 10” x 10’ Round Tapered Column with a Tuscan Cap and Base would go from weighing roughly 128 lbs. to 64 lbs. The final ingredient is fiberglass strand chopped or cut to ¼” or ½” strands. The strand size used will depend on the diameter or width of the column and is used to reinforce the column and provide it with added strength.

Product Offering

Our RoyalCast™ fiberglass columns are available in every style and size that we offer. Shaft styles are as follows: Round Tapered Plain, Round Tapered Fluted, Round NON-Tapered Plain, Round Twist Rope, Square NON-Tapered Plain, Square Non-Tapered Fluted, Square NON-Tapered Recessed Panel, and Square Tapered Plain. Depending on the shaft style, we offer columns from 6” in diameter and width up to 36” in diameter x 30’ tall. Our most diverse offering is our round tapered plain as tapered columns are consider architecturally correct. Our round non-tapered plain columns are some of the tallest in the industry and we offer sizes from 6” diameter to 36” in diameter. We offer square non-tapered plain columns from 6” to 16” x 20’. We also offer several sizes of twist rope columns (not offered by any other manufacturer) and square tapered columns. The majority of our round columns come with integral astragals or neck rings so you won’t have to attach a neck ring, that is typically made from a different material, to the shaft on the jobsite. We have the ability to remove our astragal if desired. We are also one of the few manufacturers that offer our caps and base made from the same poly/marble material as the shaft. Most column suppliers, in an effort to save themselves money, offer cheap foreign made caps and bases from alternative materials. Mixing materials presents problems when painting the columns as different materials react to paint adhesion differently and contract and expand differently. In addition to offering the typical Tuscan style caps and bases, we offer Roman Doric caps and bases, several decorative capitals, and Attic Bases. Unlike most manufacturers, we are able to modify our Tuscan, Doric, and Attic caps and bases to have a round abacus or round plinth. Please see our catalog or pricelist for specific sizes offered.

Royal Corinthian manufactures RoyalCast™ fiberglass columns from a combination of filler, resin, and fiberglass chop strand. This composition is the most popular for what the industry calls fiberglass columns; however, this is a misnomer as these types of columns have a small percentage (1% to 3%) of fiberglass content. Our RoyalCast™ columns should really be called polymer marble composite columns. Regardless of the naming convention, these are the most popular fiberglass columns used in America. These offer the greatest advantage over our other columns when paint-grade, robust, load-bearing columns are desired.

NEW STYLE! Round Non-Tapered Segmented Columns

Royal Corinthian now offers all of our round non-tapered columns and column covers in a segmented style. The segments can be spaced apart in any conceivable manner and can even run vertically between horizontal segments. The product is very customizable but at standard pricing.

This style already exists in the market place but not in the materials that we offer:

  • Round Non-Tapered Segmented – RoyalCast Fiberglass
  • Round Non-Tapered Segmented –RoyalStone Synthetic Stone
  • Round Non-Tapered Segmented –RoyaLite FRP Lightweight Fiberglass

See More


RoyalCast™ Fiberglass
Best ApplicationPaintable Whole Columns
Factory Finish (standard)Paint-grade Gray, sanded seam
Factory Finish (options)Paint-grade Only
Price Comparison$$
Wall Thickness3/8" to 2"
Weight (per sq ft)3 to 20 lbs
WarrantyLimited Lifetime
Split/Half ColumnsYes
Full ColumnsStandard
Fiberglass content1-3%
FillerCalcium Carbonate/ATH/Prolite
Fire RatingAvailable: Class A
LEED PointsAvailable