What kind of adhesive is required for structural LVL?

Weather and Boil Proof (WBP) type synthetic resin adhesives, like Phenol Formaldehyde, conforming to IS 848 are required (Clause 4.2).

What is the maximum permissible moisture content in LVL?

The moisture content of the finished LVL shall not exceed 15 percent at the time of testing (Clause 6.1).

Can LVL have veneers in different directions?

Yes, while most veneers are parallel, up to 20% of veneers may be oriented as cross-bands to improve dimensional stability (Clause 5.1.2).

How is LVL graded according to this standard?

LVL is graded based on its Modulus of Elasticity (MOE) and Modulus of Rupture (MOR) values, such as Grade E11, E12, etc., as specified in Table 1.

IS 14275

: 1995

Laminated Veneer Lumber (LVL) for Structural Purposes - Specification

CurrentSpecializedSpecificationBIMStructural Engineering · Timber and Wood

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This standard specifies the requirements for Laminated Veneer Lumber (LVL) intended for structural applications. It covers the materials, manufacturing process, dimensions, physical and mechanical properties, testing procedures, and marking for quality assurance.

Specifies the requirements for Laminated Veneer Lumber (LVL) intended for structural applications, covering dimensions, properties, and testing.

Quick Reference Values

Adhesive TypeWeather and Boil Proof (WBP) type synthetic resin (e.g., Phenol Formaldehyde)

Maximum Moisture Content15 %

Minimum Glue Line Shear Strength (Dry State)4.0 N/mm²

Veneer Thickness Range1.5 mm to 4.8 mm

Minimum Bending Strength (MOR Parallel to grain, Grade E11)44 N/mm²

Minimum Modulus of Elasticity (MOE Parallel to grain, Grade E11)11000 N/mm²

Practical Notes

LVL strength is directional. Ensure the 'parallel to grain' orientation aligns with the primary stress direction (e.g., along the length of a beam).

For any application with potential exposure to moisture or weather, verify that WBP (Weather and Boil Proof) type adhesive was used during manufacturing.

Although more dimensionally stable than solid timber, LVL still requires proper storage and protection from direct water contact on site to prevent swelling and delamination.