Featured Links

Rosboro Custom Glulam

Rosboro now offers glulam in custom sizes that feature the inherent strength and durability of our other industry-leading engineered wood products. Rosboro Custom Glulam provides increased convenience and flexibility, allowing our customers to combine custom orders with other products from the most trusted name in glulam.

Rosboro Glulam is available in Premium, Architectural, Industrial and Framing Appearances.

• Up to 14-1/4" wide
• Depths to 53"
• Standard glulam depths or I-Joist compatible depths
• Lengths to 100'

Unbalanced Glulam Beams
The most critical zone of a glulam bending member with respect to controlling strength is the outermost tension zone. In unbalanced beams, the quality of lumber used on the tension side of the beam is higher than the lumber used on the corresponding compression side, allowing a more efficient use of the timber resource. To assure proper installation of unbalanced beams, the top of the beam is clearly stamped with the word "TOP." Unbalanced beams are primarily intended for simple span applications.

Balanced Glulam Beams
These members are symmetrical in lumber quality about the mid-height. Balanced beams are used in applications such as cantilevers or continuous spans, where either the top or bottom of the member may be stressed in tension due to service loads. They can also be used in single span applications, although an unbalanced beam is more efficient for this use.

Species Characteristics

Douglas Fir (DF)
Douglas Fir, the predominant framing material in the west is dimensionally stable and universally recognized for its superior strength-to-weight ratio. Its high specific gravity provides excellent nail holding ability.

BigBeam - High Strength, I-Joist Compatible Rosboro

For more information go to www.rosborobigbeam.com

Southern Yellow Pine (SYP)
Southern Pine has long been the preferred species for pressure treatment because of its unique cellular structure that permits deep, uniform penetration of preservatives. Some 85% of all pressure-treated wood produced in the U.S. is Southern Pine.

Alaska Yellow Cedar (AYC)
A tough, solid and very durable tree, Alaska Yellow Cedar is noted for its very slow growth and great longevity. Its natural oily extractives make it highly decay resistant and strongly aromatic when freshly cut. The wood of the Alaska Yellow Cedar is characterized by its distinctive and uniform yellow color. The narrow band of sapwood is very similar in color to the heartwood. The wood is fine in texture and has a straight grain. When green, the wood has a pungent sulfur odor. Yellow Cedar exhibits notable durability and longevity, being resistant to decay and insect attack.

Port Orford Cedar (POC)
Rated strongest among all cedars, Port Orford Cedar (POC) has earned a reputation for its strength and decay-resistance due to naturally occurring oils that help protect against moisture and microorganisms. Port-Orford-cedar has been used for a wide variety of things from the Hawaiian Presidential Palace to Japanese Buddhist temples, California gold mine timbers and building construction. It was used for high quality boats - Sir Thomas Lipton used this wood for his Shamrock series of 100' racing sailboats, built as challengers for the Americas Cup just prior to World War 1.

Camber
While any wood-bending member can be designed to minimize deflection, glulam is the only engineered wood product that can be easily cambered to reduce the aesthetic effect of in-service deflections. The glulam industry recommends that roof beams be cambered for 1-1/2 times the calculated dead load deflection. This will generally be sufficient to assure that the beam will not exhibit sag over a period of many years of loading, as may occur with non-cambered wood products.

To achieve a level profile it is recommended that floor beams be only cambered for 1.0 times the calculated dead load deflection. Most residential applications require very little or no camber which, in turn, makes glulam the ideal choice. Rosboro's standard camber is 5000-foot radius, which is nearly flat.

Curved Glulam
Rosboro can manufacture many different curved shapes up to 100 foot long. The Rosboro glulam sales team will help you complete your curved beam specification.

Treated Glulam

• Species Coast Region Douglas Fir or Southern Yellow Pine
• Custom beams can be ordered with specified treatment
• Incising punctures the surface of the wood to assure deeper and more uniform penetration of preservative. Incising is recommended for all species except Southern Pine. Incising is not considered to have a detrimental effect on the strength of glulam. However, the effects of incising on appearance should be considered when treatments are specified.

Appearance
Glulam appearance classifications and glulam strength characteristics are not related to one another. Laminating lumber is selected for its strength attributes where appearance is specified to satisfy the end use.

Framing Appearance
This glulam is intended for concealed applications and is available in widths designed to fit flush with standard wall framing. The Framing Appearance standard allows for more irregularities than either the Architectural or Industrial Appearance standards.

• Two wide faces are "Hit and Miss" surfaced
• Low laminations, glueline squeeze-out and light wane are permitted
• Voids are not filled

Industrial Appearance
This glulam is used in applications where appearance is not of primary importance such as industrial buildings and warehouses.

• Voids on the edges of laminations are not filled
• Narrow faces of the beam are not surfaced
• Edges are not eased.
• Occasional misses, low laminations or light wane is permitted.

Architectural Appearance
Architectural appearance is suitable for applications where glulam is exposed in the finished structure such as; residences, office buildings, restaurants and schools and other uses where finished appearance is important but not the overriding consideration.

• Voids larger than ¾" are filled
• Low laminations are repaired
• All exposed faces are sanded
• Corners of the wide faces exposed to view are eased

Rosboro "Premium"
Rosboro premium matches the industry standard for premium appearance and should be specified for applications when appearance is critical. The finished glulam will still exhibit the natural visual characteristics of lumber such as knots and distorted grain.

• All Voids Greater Than ¼" Filled With Wood Filler
• Sanded Finish Misses Not Permitted
• Edges Eased As Specified
• Wane Is Not Permitted

Rosboro Premium "Hand Select"
Rosboro Premium Hand Select is our top appearance classification for use when appearance is the primary design consideration. The finished glulam will still exhibit the natural visual characteristics of lumber such as knots and distorted grain.

• Lumber Is Pre-Graded For Sound Tight Knots And Limited Defect
• Maximum Open Void In Either Face Or Side Of Glulam ½"
• No Filler Unless Specified
• Sanded Finish Misses Not Permitted
• Edges Eased As Specified
• Wane Is Not Permitted
• The Corners Of The Wide Faces Exposed To View Shall Be Eased

Rough Sawn Texture
Rosboro's Rough Sawn Texture creates a surface similar to a rustic sawn timber. The rough sawn texture can be applied to any of the appearances such as industrial, architectural and premium.

Fabrication and Connections
Rosboro provides a full range of fabrication services that save time and money on the jobsite.

For more information see:

• Glulam Detail Sheet
• APA Glulam Application Drawings

Rosboro Design Software
Rosboro KeyBeam software takes all of the guesswork out of specifying and using glulam. This free software, created by Rosboro in association with Keymark of Boulder, Colo., allows users to easily enter the span and load conditions for a given project and automatically determine the best product for that application. Users can also calculate multiple spans, point loads, cantilevers and other applications.

KeyBeam software is ideal for architects, designers and builders. It recognizes all United States building codes and offers printable design calculations and beam capacities.
Keybeam is free to current Rosboro customers, as well as designers and Specifier's of Rosboro's engineered wood products.

Certifications

• APA/EWS
• Independent Inspection Title 24
• JAS
• CSA
• FSC

Please contact our sales department with your next quotation.

Click on the following links to find out more about Rosboro's family of glulam products:
X-Beam™
BigBeam^®
Treated Glulam
Glulam Columns
Glulam Tall Wall
RMT^®