SIST EN 14081-2:2018/kprA1:2022

Overview

SIST EN 14081-2:2018/kprA1:2022 is a European standard developed by CEN (the European Committee for Standardization) that addresses timber structures, specifically focusing on strength-graded structural timber with rectangular cross sections. This part of the standard outlines additional requirements for the type testing of machine graded timber, supplementing the general provisions given in EN 14081-1. It primarily applies to timber that has been shaped by sawing, planning, or other methods, and which may have acceptable deviations from target sizes as defined in EN 336. The standard also covers requirements for the strength grading machines used in this process.

Key Topics

• Machine Grading of Timber
  The standard details the process of using machines to automatically grade structural timber based on various physical properties, such as strength and density.

• Type Testing Requirements
  In addition to existing criteria from EN 14081-1, this document introduces further type testing protocols to ensure the reliability of machine-graded timber.

• Sampling Procedures
  Specifies how timber samples should be selected, including minimum sample sizes (at least 40 specimens per grade, species, and source) to ensure robust verification of grading systems.

• Verification of Machine Settings
  Establishes the detailed requirements for checking and confirming the correct settings in grading machines, ensuring that output meets declared strength classes.

• Testing Parameters
  Requires verification of key mechanical properties such as bending or tension strength, modulus of elasticity, and density for each grade, species, and size category.

Applications

SIST EN 14081-2:2018/kprA1:2022 is essential in the following contexts:

• Structural Timber Production
  Manufacturers of sawn or planed structural timber rely on this standard to ensure their machine grading processes meet European quality and safety requirements.

• Quality Assurance and Compliance
  Timber producers and grading machine operators use the specified type testing methods to demonstrate compliance with building codes and market requirements.

• Timber Frame Construction
  Companies and professionals involved in engineered timber structures, such as house builders or civil engineers, benefit from the confidence that graded timber meets structural performance standards.

• Market Acceptance and Certification
  Meeting the requirements of EN 14081-2 helps manufacturers obtain CE marking and access to the European market for strength-graded timber products.

Related Standards

Several other standards and documents are closely connected to SIST EN 14081-2:2018/kprA1:2022:

• EN 14081-1
  Specifies the general requirements for strength-graded structural timber with rectangular cross sections.

• EN 14081-3
  Covers requirements for output-controlled grading systems, including verification procedures referenced in type testing.

• EN 336
  Defines permissible size deviations for structural timber, ensuring consistency in cross-sectional measurements.

• ICS 79.040
  Refers to wood, sawlogs, and sawn timber, supporting traceability and standardization across the industry.

Summary

By establishing clear and robust type testing requirements for machine-graded timber, SIST EN 14081-2:2018/kprA1:2022 enhances the reliability, safety, and marketability of structural timber across Europe. This standard is critical to ensuring that all machine-graded timber products used in construction fulfill strict European performance criteria - contributing to safer, more sustainable timber structures.