Rosboro Treated Glulam

Technical Reference and Specifications
For more in-depth technical information, click here

Treated Glulam Beams and Columns You Can Trust
As the leading producer of glulam products in the U.S., Rosboro continues to respond to demand by producing Treated Glulam Beams and Columns. These beams and columns are made from Southern Pine and then treated to resist rot, decay and insect attack or other conditions that can destroy wood. Installation is easy because the beams and columns are straight and manufactured to match standard framing widths and depths. Backed with a 25-year warranty, Rosboro Treated Glulam products are a solid choice for decks, porches and balconies.

Beams Treated with Hi-Clear II
Rosboro Treated Glulam Beams are pressure treated by Permapost with Hi-Clear II, a clear industrial wood preservative that provides chemical resistance against insect attack, decay, mold, mildew, bacterial growths and is also effective against the Formosan termite. Hi-Clear II is intended to be used in above ground exterior applications or it can be used for interior applications after all solvent odors have fully dissipated. The treatment is clean, non-swelling and non-leaching and leaves the beam a light honey color. The 24F 1.8E Beam is made in a balanced lay-up, meaning there is no top or bottom making installation clean and simple. For more information on Hi-Clear II, please visit our technical reference page

Beams Are Available in Common Sizes:
Lengths: 48 feet
Widths: 31/2" and 5 7/16"
Depths: 91/2", 117/8", 14", 16" and 18"

Columns Approved for Ground Contact
Rosboro Treated Glulam Columns are pressure treated by Permapost with Green-Gard PT^TM treatment, 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. Green-Gard PT^TM 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. The more aggressive Green-Gard PT^TM treatment is intended for exterior applications and has a color range between greenish-blue to light brown. For more information on the Green-Gard PT^TM treatment, please visit our technical reference page.

Columns Are Available in Common Sizes:
Lengths: 48 feet
Widths: 3-3/8", 5-1/4" and 7"
Depths: 3-1/2", 5-1/2" and 7"

The Royal Treatment - Permapost

Rosboro Treated Glulam is treated with an industrial wood preservative which provides chemical resistance to insects, decay, mold, mildew and bacterial growths. The treatment is clean, non-swelling, non-leaching and non-corrosive. To learn more about Permapost, visit www.permapost.com.

Appearance Classification
Rosboro Treated Glulam Beams are sized to match standard framing widths. The beams and 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.

Restricted Uses
Although Rosboro Treated Glulam Beams and Columns are pressure treated, they should not be used in marine applications such as docks and marinas and in conditions where the product is in contact with standing water.

Recommended Hardware, Resealing and Finishing
Moisture can accumulate around connections, such as hangers, fasteners bolts, nails and screws. Treated Glulam provides protection from moisture induced rot and decay at these locations. Field fabrication, trimming, holedrilling or minor surface damage, should be sealed with copper naphthenate, which is available at local home centers. Rosboro has specifically selected treatments that are known to be non-corrosive to metal, however, we recommend the use of hangers and fasteners specified for treated wood products such as hot-dip galvanized or stainless steel. Oil-based stains and paints can be applied as a final finish.

Understanding Wet-Use vs. Dry-Use
Wet-use and dry-use are terms that are associated with in-service conditions. Usually a glulam member is exposed to water on an intermittent basis only. Any wetting is typically followed by a drying cycle, and the product never reaches a consistent wet-use condition. This situation is classified as dry-use.

The technical measure of wet-use is accepted as consistent moisture content within the beam of 16% or greater. A wet-use condition is rarely reached unless the beam is submerged in water or subjected to an artificially humid moisture condition. For example, a beam in an environment having a constant relative humidity of 80% and a temperature above 70° F will not reach a consistent moisture content of 16% or greater. Since a combination of high relative humidity and temperature outside of this range is seldom reached in the U.S., ambient air conditions rarely result in a wet-use classification. If there is any question regarding use condition, a licensed deretained to determine if wet-use design adjustments apply.

Easy and Safe to Work With
Treated Glulam Beams and Columns not only resist rot and decay, but with simple precautions, the products are safe and easy to work with. The treatment used for Rosboro Treated Glulam is low in toxicity to humans. However, gloves should be worn when handling treated products and dust masks and eye protection should be worn when cutting treated material. Always follow site, handling and disposal instructions provided by Materials Safety Data Sheets (MSDS) available on our technical reference page

Code Recognized
Rosboro glulam is manufactured in accordance with ANSI Standard A190.1-02, which is a code-recognized national consensus standard for glulam, using wet-use adhesives complying with ASTM Standard D2559. The lay-up combinations EWS 24F-V5M1/SP and Combination Number 50 are recognized under ICC-ES Report ESR-1940. Rosboro's glulam production is inspected and certified by APA-EWS.

For design values or for more information about Rosboro Treated Glulam Columns, contact one of our sales representatives today at (888) 393-2304.

Click on the following links to find out more about Rosboro's family of glulam products:
BigBeam®
Stock Glulam
1.8E IJC
RMT®
Glulam Columns
Glulam Tall Wall
Custom Glulam

Other links:
Tech Reference and Specifications
FAQ