Royal Corinthian

Round Non-Tapered Columns

Round Non-Tapered Columns

Royal Corinthian manufactures round non-tapered columns from 3 composite materials: Composite FiberglassPolymer Stone, and FRP Lightweight Fiberglass. All three materials are available in all of the sizes below.  We are able to create additional diameters by taking the bottom portions of our tapered columns so if you are looking for 6”, 22”, 28”, 30”, or 36” diameter non-tapered porch columns, please call or email for additional information.  We differ from the rest of the industry in that our non-tapered columns have astragals that are part of the shaft which saves a lot in terms of installation costs if you have to attach loose astragals on site.  If you do not desire to have an attached neck ring, we are able to remove them from the shaft at no cost.

The majority of our non-tapered columns come with a cap support ring that holds up a Tuscan capital, which is very useful especially when using some of our heavier materials.  The cap support ring is removed in instances where decorative capitals are used. The structural supports chart below corresponds to our RoyalCast fiberglass columns: Synthetic stone columns tend to be slighter thicker and RoyaLite columns tend to be thinner.  Exact specifications for the aforementioned are available upon request or via shop drawings.  The load bearing specifications chart pertains only to RoyalCast and RoyalStone columns: RoyaLite columns are typically used as column covers but in instances where we assemble them into whole columns, the load-bearing capacities will be significantly lower than on the chart below.

Plain Non-Tapered Column Dimensions

Shaft Dia
shaft Dia
Cut at
6"6"6"1"4-3/8"-3/8"6, 8, 9, 10
8”7-5/8”7-5/8”3/4”4-5/8”2-1/2”3/8”6, 8, 9, 10
10”9-5/8″9-5/8″3/4”6”3/8”6, 8, 9, 10, 12
12”11-5/8”11-5/8”7/8”7”4-3/16”3/8”6, 8, 9, 10, 12, 14, 16
14”13-5/8”13-5/8″1”8-1/8”4-3/4”1/2”6, 8, 9, 10, 12,
14, 16, 18, 20, 22
16”15-5/8”15-5/8”1-5/8”8-3/4”5-1/4”1/2”6, 8, 9, 10, 12, 14,
16, 18, 20, 22, 24
18”17-5/8”17-5/8”2”9-1/4”5-3/8”5/8”6, 8, 9, 10, 12, 14,
16, 18, 20, 22, 24, 26
20″19-7/8″19-7/8″1-1/2″12-1/16″7-5/16″5/8″6, 8, 9, 10, 12, 14, 16,
18, 20, 22, 24, 26, 28
24”23-7/8”23-7/8”2-1/4”13-3/8”8-3/8”5/8”6, 8, 9, 10, 12, 14, 16,
18, 20, 22, 24, 26
30"29"29-1/8"29-1/8"6, 8, 9, 10, 12, 14, 16,
18, 20

Columns to Surround Structural Supports

Inside Top Shaft
Diameter (S)
Largest Round
Largest Square

Columns that surround structural supports are typically split or unassembled in the instance of RoyaLite. The chart above allows for saw kerf. Columns that are split are no longer considered load-bearing. The inside diameter of decorative capitals is much smaller than the column shaft so the chart above will not work for decorative capital applications. 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 at the time of order on the purchase order. Please note that this chart is for Round Non-Tapered RoyalCast Columns; RoyalStone Columns tend to be slightly thicker and RoyaLite tend to be thinner.

RoyalCast & RoyalStone Load Bearing Specifications

RoyalCast & RoyalStone Column DiameterLoad Bearing Specifications Load (max lbs.)
8”10, 000
10”14, 000
12”18, 000
14”20, 000
16”20, 000
18”20, 000
20″20, 000
24”20, 000

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