ISO 18776:2008

Name: ISO 18776:2008 — Laminated veneer lumber (LVL) — Specifications
SKU: ISO 18776:2008
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Laminated veneer lumber (LVL) — Specifications

Название (английский):

ISO 18776:2008

Laminated veneer lumber (LVL) — Specifications

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 13
Дата публикации:: 28 января 2008 г.
Издание:: ISO IS 18776 edition 1 version 1
ICS:: 79.060.99

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Описание (английский):

ISO 18776:2008 specifies the requirements for Laminated Veneer Lumber (LVL) for general purposes and structural applications, in dry, tropical-dry/humid or high humidity/exterior conditions. Laminated Veneer Lumber (LVL) is a general description for an assembly of veneers laminated with an adhesive, in which the grain direction of the outer veneers and most other veneers is in the longitudinal direction. ISO 18776:2008 specifies requirements for the quality of veneers, bond durability, tolerances on dimensions, and structural characterization.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 18776:2008 - Laminated veneer lumber (LVL) - Specifications defines minimum requirements for LVL products intended for general-purpose and structural use in dry, tropical-dry/humid, and high-humidity/exterior conditions. The standard covers material selection, manufacturing controls, bond durability, dimensional tolerances, structural characterization and marking of LVL. It is the reference for suppliers, specifiers and testing laboratories involved in LVL production and certification.

Key topics and technical requirements

Scope and use classes: Applies to LVL assemblies where veneer grain in outer and most veneers is longitudinal; suitable for internal and protected external structural applications depending on service humidity.

Quality system / conformance: Requires a formalized manufacturing specification and quality system with in-plant controls and external auditing (consistent with ISO/IEC Guide 65).

Veneer requirements:

Species: any wood species permitted.
Thickness: nominal maximum veneer thickness 6.0 mm unless otherwise specified.
Quality grading, jointing (edge and end joints) and veneer position (for structural LVL) must be defined.

Adhesives & bond durability: Adhesive systems must deliver required bond strength and durability; bonding quality is established per ISO 12466 series (chisel test and requirements).

Dimensional & shape tolerances: Dimensions measured at 10 ±4 % moisture content. Examples of shape limits include spring/bow ≤ 1 mm per 1 000 mm and cupping ≤ 1 mm per 100 mm; squareness ≤ 1 mm in 50 mm; twist calculated by the formula in the standard.

Mechanical & physical properties: Bending strength and modulus of elasticity (MOE) per ISO 16978; density and moisture content per ISO 9427 and ISO 16979. Structural LVL requires formal structural testing and evaluation to produce characteristic design values.

Supplementary items: Preservative/chemical treatment guidance, formaldehyde emission measurement (ISO 12460 series), marking and product identification.

Applications

ISO 18776:2008 is used when specifying or producing LVL for:

Load-bearing members (beams, rafters, studs, joists) where predictable structural properties are required

Interior structural elements and protected external applications (cladding backer, roof members)

Situations requiring documented quality control, bond durability and dimensional precision

Related standards (normative references)

Key referenced documents include:

ISO 12466-1 / ISO 12466-2 (bonding quality)

ISO 16978 (bending strength and MOE)

ISO 16979 (moisture content)

ISO 27567 (measurement of dimensions and shape)

ISO 12460 series (formaldehyde release)

Keywords: ISO 18776:2008, Laminated veneer lumber, LVL specifications, bond durability, veneer quality, structural LVL, dimensions and tolerances, formaldehyde release, LVL manufacturing.

ISO 18776:2008

Abstract

Похожие стандарты

ISO 18776:2008

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications

Who should use this standard

Related standards (normative references)

Технические детали

ISO 12466-1:2007

Plywood — Bonding quality — Part 1: Test methods

ISO 16978:2003

Wood-based panels — Determination of modulus of elasticity in bending and of bending strength

ISO 9427:2003

Wood-based panels — Determination of density

ISO 16979:2003

Wood-based panels — Determination of moisture content

ISO 12460-2:2024

Wood-based panels — Determination of formaldehyde release — Part 2: Small-scale chamber method

ISO 12466-2:2007

Plywood — Bonding quality — Part 2: Requirements

ISO 27567:2009

Laminated veneer lumber — Measurement of dimensions and shape — Method of test