FAQs - Pacific Lumber Inspection Bureau

Glulam beams are typically designed with the highest quality laminations placed in zones of maximum expected flexural tension stresses. A somewhat lower grade can be used to resist flexural compression stresses with no reduction in beam capacity. Consequently, lay-ups are divided into two categories: balanced and unbalanced (see Figure). Balanced beams are typically used for continuous-span and cantilevered applications where both the top and bottom of the beam will be subject to flexural tension. Unbalanced beams are preferred for simple spans because they use lumber resources more efficiently and are consequently more economical than balanced beams. Unbalanced beams can also accommodate short cantilevers (up to about 20% of the main span).

To avoid improper installation, glulam beams are distinctively marked with a “TOP” stamp. Protective wrappings on glulam beams are also typically stapled on the top face of the beam to avoid damaging the faces that will be exposed to view in the finished structure.

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Unbalanced layups are optimized for simple spans, and balanced layups are optimized for multiple spans. Letters symbolize the relative quality of laminations (A represents the highest quality, C represents the lowest quality in lay-up).

Glulam timbers will perform similarly to sawn lumber of the same species when used outdoors. For unprotected outdoor exposure the wood used must be heartwood of a naturally durable species or pressure-treated with an approved preservative to ensure durability. The International Building Code , Section .12.2.4 states, “ The portions of glued-laminated timbers that form the structural supports of a building or other structure and are exposed to weather and not fully protected from moisture by a roof, eave or similar covering shall be pressure treated with preservative or be manufactured from naturally durable or preservative-treated wood.” AITC 109- explains preservative treatment options for glulam.

Glulam does not require preservative treatment where it is protected from exposure to rain and snow. The humidity in the air is not generally sufficient to raise the moisture content of the wood to a level that will support decay. If the wood is kept dry, it will not decay. A well-detailed roof with fascia or flashing to protect the beam ends is usually sufficient protection for a timber beam. As a rule of thumb, wood should be kept above a plane drawn from the lowest point of the roof or fascia toward the structure at a slope of one vertical unit for every two horizontal units or be pressure-treated or naturally durable (See figures pictured right). Detailing recommendations and related information are contained in AITC Technical Notes AITC-TN-12- and AITC-TN-13- and Standard AITC 104-.

Adhesives used in structural glued laminated timber (glulam) are engineered to be as strong and durable as the wood substrates which they bond. They are subject to stringent manufacturing requirements and rigorous qualification testing prior to acceptance for use. Additionally, tests for strength and durability are performed in the laminating plant on a daily basis. These measures result in an adhesive bond with strength and durability comparable to the wood itself.

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In general, the laminated timber industry recommends against using waterborne preservative chemicals to pressure-treat structural glued laminated timbers after bonding. This recommendation is intended to prevent appearance problems caused by the treatment and subsequent re-drying. However, pressure-treatment with waterborne chemicals after bonding does not generally make the laminated timber structurally unfit. Treating structural glued laminated timber (glulam) with waterborne chemicals after bonding may be a viable option for applications where appearance is less critical.

While not generally recommended due to aesthetic issues, the pressure-treatment of structural glued laminated timbers with waterborne preservatives after bonding may be a viable option for many uses where appearance is less critical. Adhesives used in modern glulam are extremely durable and are considered waterproof. Glulam timbers treated after bonding will accept treatment and resist decay similar to treated sawn timbers of the same species and will perform similarly in service. If the appearance of this product is acceptable to the consumer, it can be used successfully in applications where treated wood is required.

H20 Extra Beam

• These beams are appreciated for their strength, lightness and ability to support significant loads. They are often used in the construction of” formwork for slabs, walls, and other concrete elements. requiring enhanced performance.
• They generally offer great flexibility and can be used in various types of construction projects, ensuring high performance for the creation of strong and durable concrete structures.

Description technique Documentation Video de montage

The H20 Extra Beams may feature improved technical characteristics, such as increased strength, superior durability, or specific dimensions, making them suitable for projects where stricter requirements are needed.

• Lengths: , mm.
• Made from carefully selected spruce or fir wood.
• The flange and the web are joined by a finger joint and are glued in a crosswise manner (relative to the growth rings).
• The flanges can be assembled in length. The flange is milled along its core.
• The edges of the flange are planed and beveled (up to approximately 0.4 mm).

Wood species: Spruce, fir
Wood moisture content: 12 % +/- 2 %
Weight: 4,5 kg/m
Gluing: Melamine resin-based glue, adhesive type I according to EN 301 approved for bonding load-bearing wooden elements.
Surface protection: The surface is fully protected by a waterproof and water-repellent coating.

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