AS/NZS 4787:2001 (R2016)

Table of Contents

Abstract

Sets out procedures for specifying and verifying the moisture content of seasoned solid timber. Provides a range of drying quality classes for timber dried in kilns or by other means where the result is a population of timber with a predictable scater of moisture contents. Other drying quality criteria such as checking, collapse and distortion are detailed in an appendix.
RECONFIRMATION NOTICE
Technical Committee TM-012 has reviewed the content of this publication and in accordance with Standards Australia procedures for reconfirmation, it has been determined that the publication is still valid and does not require change.
Certain documents referenced in the publication may have been amended since the original date of publication. Users are advised to ensure that they are using the latest versions of such documents as appropriate, unless advised otherwise in this Reconfirmation Notice.
Approved for reconfirmation in accordance with Standards Australia procedures for reconfirmation on 20 May 2016.
Approved for reconfirmation in New Zealand on behalf of the Standards Council of New Zealand on 5 July 2016.
The following are represented on Technical Committee TM-012:
Australian and New Zealand Timber Preservative Manufacturers Association
Australian Forest Products Association
Australian Pesticides and Veterinary Medicines Authority
Australian Timber Flooring Association
Australian Timber Importers Federation
Building Research Association of New Zealand
Department of Agriculture, Fisheries and Forestry (QLD)
Engineered Wood Products Association of Australasia
Forest and Wood Products Australia
Forestry Corporation of NSW
Glued Laminated Timber Association of Australia
Master Builders Australia
NATSPEC
New Zealand Timber Industry Federation
New Zealand Timber Preservation Council
New Zealand Wood Processors Association
Responsible Care New Zealand
Scion
Tasmanian Timber Promotion Board
Timber Preservers Association of Australia

Scope

This Standard sets out procedures for specifying the moisture content and other drying quality criteria of seasoned solid wood products and is primarily intended for use by processors, merchants and users, to assess the drying quality of a pack, stack or charge of dry timber. It describes drying quality classes and gives sampling methods for testing products to establish compliance.
This Standard is for use with softwood or hardwood boards up to 80 mm in thickness, where the moisture contents of boards in a quantity exhibit a single skewed distribution. (At the end of drying there is usually variability in the between-board moisture content distribution with a longer tail above than below the most common moisture content value.) Where such a single skewed distribution does not exist, then this Standard may be used, provided upper or upper and lower cut-off limits are set.
NOTES:
1 It is intended that the Standard provide a uniform methodology for the assessment of drying quality for the timber industry. For example, processors may use the Standard to define procedures for quality assessment of dried timber as part of process quality control documentation, or to detail product quality specifications in supply agreements with merchants or users.
2 Where the Standard is used beyond a drying facility, caution is recommended, due to the following reasons:
(a) Consignments of timber may comprise a mix of timber from different sources or charges, and the distribution of moisture content may not conform to assumptions made in developing the sampling regime.
(b) Timber may be subjected to other influences causing higher moisture content in some materials, e.g. inadequate weather protection, leading to non-conforming distributions of moisture content.
In the above two cases the sampling procedure outlined in this Standard may not be adequate.
3 Some specifiers may nominate absolute limits.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
ProductNote	Reconfirmed 07/10/2016. This standard has been reconfirmed in Australia in 2016 and remains current in New Zealand. Reconfirmation Notice 7/10/2016
Pages
ISBN
Committee	TM-007
Supersedes	DR 99087