Round Fluted Columns

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Royal Corinthian manufactures round fluted columns from 3 composite materials: RoyalCast™ Fiberglass, RoyalStone™ Synthetic Stone, and RoyaLite™ FRP Fiberglass. We only use composite materials because we believe in emulating the architecture of the Greeks and Romans but with materials that will last for generations. In addition, we also offer RoyalCrete™ glass fiber reinforce concrete or GFRC columns for those that desire a segmented cast stone look. If you know which material is most suitable for you, the charts below offer sizes and other pertinent information. If you want to learn more about each material, please visit our columns section for more information or call us for a quick run through.

Our fluted columns, which have tapered shafts, are available up to 36” in diameter and various heights. If you are needing non-tapered columns with flutes, we are able to provide those as well (please call or email for more information). The majority of our fluted columns come with a capital support ring (E) which holds the Tuscan Cap in place. Some stock sized columns do not have the support ring as indicated in the chart below. Most manufacturers don’t offer a capital support ring on any of their columns but we figured why not help you with the installation of our heavier capitals by providing a ledge for those caps to sit on. When decorative capitals are used, the column shaft gets cut down to the astragal or neck ring, which eliminates the support ring altogether. It is architecturally correct for the decorative capital to sit on the astragal. Not all of the information in the charts below pertains to all of the materials that we offer so please read the notes associated with each chart. For specs on GFRC columns or specs that aren’t found here, please contact us. Additional information can also be found on our CAD drawings.

Round Fluted Columns Roman Corinthian

RoyalCast & RoyalStone Column Specifications

Column Diameter   Bottom    Shaft  Dia.     Top     Shaft Dia.Bead HeightCut At Bead Loss         First Ring         Average Wall ThicknessAvailable Heights (feet)
8″7-1/2″6-3/8″3/4″4″3/8″8, 9, 10, 12
8″ *8″7″1-3/8″5-1/2″2-11/16″3/8″8
8″ *7-5/8″6-5/8″7/8″4-1/4″3/8″8, 9, 10
10″9-1/2″8-5/16″3/4″5″3/8″8, 9, 10, 12
10″ *10-1/8″9-1/4″1-1/4″6″2-7/8″3/8″7
10″ *10-1/8″9-1/4″1-3/16″7-5/8″2-7/8″3/8″8
10″ *10-1/16″9″1-1/4″5-7/8″2-7/8″3/8″8, 9
10″9-1/4″8-1/2″5/8″5-1/2″3/8″8, 9, 10, 12, 14, 16
12″11-1/2″9-11/16″7/8″6″3/8″8, 9, 10, 12
12″ *12-1/16″10-1/8″7/8″5-3/4″3-5/16″3/8″8
12″ *12″10-1/16″7/8″5-3/8″3-1/2″3/8″8, 9
12″ *11-5/8″10″1-5/16″5-1/4″3-1/2″3/8″8, 9, 10, 12
14″13-5/8″11-3/4″1-1/8″7-1/2″4-5/16″1/2″8, 9, 10, 12
16″15-5/8″13-7/16″1-1/4″8″4-3/4″1/2″8, 9, 10, 12
16″15-7/8″13-1/2″1-1/2″7-3/4″4-3/4″1/2″8, 9, 10, 12, 14, 16, 18, 20
18″17-1/2″15-1/4″1-3/8″8-1/2″5-3/16″1/2″8, 9, 10, 12, 14, 16, 18, 20
20″19-3/4″17″2″9-1/2″5-1/2″1/2″8, 9, 10, 12, 14, 16, 18, 20, 22
24″23-5/8″19-3/4″2-1/2″12-1/8″7-5/16″5/8″8, 9, 10, 12, 14, 16, 18, 20, 22, 24
30″29-11/16″24-3/4″1-7/8″14-13/16″8-13/16″3/4″8, 9, 10, 12, 14, 16, 18, 20, 22, 24, 26
36″35-3/4″29-3/4″2-1/2″16″10-1/2″1″8, 9, 10, 12, 14, 16, 18, 20, 22

*These molds are used only by specific request.

Average wall thickness applies only to RoyalCast. RoyalStone tends to be slightly thicker walled and RoyaLite thinner, yet it is pound for pound stronger than steel. GFRC specs are available by request.

Fluted Column Line Drawing

Columns to Surround Structural Supports

Column DiameterBottom Shaft DiameterInside Top Shaft DiameterLargest Round SupportLargest Square Support

Please note that this chart is for Round Tapered Fluted RoyalCast Columns; RoyalStone Columns tend to be slightly thicker and RoyaLite slightly thinner. The chart is conservative and in most cases we can surround larger supports than indicated so if you are cutting it close, ask us to verify if we can surround your support. The chart accounts for loss due to saw kerf if you are using split columns. Split columns are no longer load-bearing. The ID of decorative capitals is significantly less than the column shaft so please consult our decorative capitals page to ascertain whether or not the column will surround your support. To insure that the column ordered will surround the intended structural support, the column needs to be split by Royal Corinthian and the shape and size of the structural support needs to be indicated on the purchase order. Royal Corinthian will not accept any liability if columns are purchased not split and do not wrap the published structural support sizes. When a column is ordered full round (not split), it is implied that the column will not be used to surround a structural support. If the contractor intends to drop a full round (not split) column around the structural support, the shape and size of the structural support needs to noted on the purchase order at the time of order.  RoyaLite column covers are already intended to be used around structural members and are supplied as halves with integrated lap joints: They can be factory assembled but will bear a fraction of the weight of the other columns. GFRC column specs are available upon request.

Tapered Column Inside Diameter

RoyalCast & RoyalStone Load Bearing Specifications

Column DiameterLoad (max lbs.)