A note about Rosboro Columns

Since compression parallel to grain stresses are distributed uniformly over the cross-section of a typical column member, Rosboro glulam columns are manufactured using a single grade of lumber throughout the depth of the member. Two distinct values are provided for Fb depending on which axis the load is applied to, i.e., parallel to the wide or to the narrow face of the member. If a column is going to be loaded as a combined axial and bending member, it may be preferable to specify a product engineered to serve as a bending member such as a BigBeam. Such members use a graded lumber layup throughout the depth of the member and are more efficient for resisting high bending stresses.

Rosboro Glulam Columns technical information.

Rosboro Glulam Columns

Selection and Stability

Combining industry-leading glulam technology with our advanced manufacturing practices, Rosboro is able to offer a suite of all-purpose glulam columns that fit the needs of today's builders.

X-Beam Architectural Glulam Columns

X-Beam glulam columns are architectural appearance, surfaced four sides and all four edges are eased. These glulam columns remain straight and true and are inventoried in the following sizes: 3-1/2" x 5", 5-1/2" x 5-1/2", 5-1/2" x 6. Other cross sections are available on a custom order basis.

X-Beam Column Appearance

When the beams are exposed and appearance is critical, Rosboro X-Beam Architectural glulam columns are the builders choice. Along with their high-grade appearance, these glulam columns remain straight and true in cross section and maintain reliable fastener-holding capacities.

X-Beam Design Values

Treated Glulam Columns

Rosboro Treated Glulam Columns are pressure treated with a mineral-spirit borne copper naphthenate preservative that provides an ideal fungicide and insecticide for the long term preservation of glulam columns in both ground contact and above-ground uses. This treatment is effective against the dampwood termite, drywood termite and subterranean termites including the Formosan termite. Rosboro recommends that columns be placed on a pier block, but if the column is used in a direct ground contact application, then it should sit in a gravel bed that allows proper drainage. This treatment is intended for exterior applications only and has a color range between chocolate brown and dark green. Treated Glulam Columns are available in the following sizes: 3-3/8" x 3-1/2", 3-3/8" x 5-1/2", 5-1/4" x 5-1/2", 5-1/4" x 7", 7" x 7".

Treated Column Appearance

The treated columns are manufactured to Framing Appearance standards that allow wane, glue squeeze and many other visual imperfections. Rosboro limits wane and lightly sands the beams and columns to remove excess glue and reduce blemishes associated with the Framing Appearance classification. These enhancements, give Rosboro treated products the advantage of full framing width and an appearance that is acceptable for the intended use.

Treated Column Design Values

Code Recognized

All Rosboro glulam columns are approved by the ICC-ES Report ESR-1940. They have been inspected and certified by the APA EWS in conformance with the American National Standard (ANSI) A190.1-02.