DD CEN TS 1099-2007 PDF

Full title and description

CEN/TS 1099:2007 — "Plywood - Biological durability - Guidance for the assessment of plywood for use in different use classes". This Technical Specification provides guidance to manufacturers, specifiers and users on selecting plywood for the EN 335 use classes by taking into account natural durability of the constituent wood species, plywood construction factors (veneer thickness, lay-up, adhesive effects) and when preservative treatment is advisable.

Abstract

The document gives practical guidance for assessing the biological durability of plywood for different exposure/use classes (as defined in EN 335). It maps natural durability classes of solid timber to plywood performance, highlights plywood‑specific factors (e.g., sapwood versus heartwood, veneer and ply thickness, glue lines), gives recommendations on preservative treatment and on installation/detailing to minimize biological attack. It does not address chemico‑physical weathering or adhesive durability.

General information

• Status: Published / Active (CEN Technical Specification).
• Publication date: 2007 (CEN/TS 1099:2007 — published 07 August 2007 in CEN records).
• Publisher: Comité Européen de Normalisation (CEN).
• ICS / categories: 79.060.10 (Plywood / wood‑based panels).
• Edition / version: Technical Specification (CEN/TS 1099:2007).
• Number of pages: Typically published as a short TS (commonly listed as 9 pages in national adoptions).

Scope

Covers guidance for selection and assessment of plywood with respect to biological durability for use in the different EN 335 use classes (risk from wood‑destroying fungi, wood‑destroying insects and marine borers). The scope explicitly excludes chemico‑physical weathering processes and does not assess the biological durability of adhesives; it focuses on factors related to the plywood panel and practical precautions during transport, installation and service.

Key topics and requirements

• Mapping of natural durability classes of constituent wood species to EN 335 use classes and guidance tables for decision‑making.
• Advice on when preservative treatment is recommended or required, and cautions about preservative leaching and protection during handling.
• Consideration of plywood construction effects: veneer thickness, number of plies, lay‑up and the influence of sapwood/heartwood proportions.
• Installation and detailing guidance to avoid moisture accumulation, ensure ventilation and protect vulnerable edges and joints.
• Practical selection rule: where exposure/conditions are uncertain, select plywood suitable for the more severe EN 335 use class, taking maintainability and replaceability into account.

Typical use and users

Used by plywood manufacturers, product specifiers, architects, building contractors, timber treaters and testing/quality personnel to: (1) select appropriate plywood grade for intended exposure; (2) decide on preservative treatment; and (3) define installation and detailing measures to reduce biological risk. National standards bodies and certification/inspection bodies may use the TS when adopting national versions.

Related standards

Key referenced and related standards include EN 335 (Use classes of wood and wood‑based products), EN 350 (Natural durability of solid wood), EN 313‑2 (Plywood terminology/classification) and the earlier ENV 1099:1997 which this TS replaces. National adoptions exist (e.g., STN P CEN/TS 1099 and other national identical adoptions indicated by prefixes such as DD / STB in some catalogues).

Keywords

plywood, biological durability, EN 335, EN 350, preservative treatment, plywood selection, veneer thickness, use classes, wood decay, insects, marine borers.

FAQ

Q: What is this standard?

A: CEN/TS 1099:2007 is a CEN Technical Specification giving guidance on assessing the biological durability of plywood for use in different EN 335 use classes. It is not a test standard but a guidance document to help selection and specification.

Q: What does it cover?

A: It covers how the natural durability of the wood species, plywood construction (veneer and ply thickness, lay‑up), and practical installation and protection measures influence plywood performance against decay, insects and marine organisms. It excludes chemico‑physical weathering and the biological durability of adhesives.

Q: Who typically uses it?

A: Manufacturers, specifiers, architects, contractors, preservative treatment providers and national standards organisations use it to choose plywood materials, set treatment policies and define installation precautions.

Q: Is it current or superseded?

A: Published as a TS in 2007 and adopted in various national catalogues (dates of national publication vary). Users should check national standards catalogues for any later confirmations, amendments or supersessions; the TS itself replaced ENV 1099:1997.

Q: Is it part of a series?

A: It is a stand‑alone CEN Technical Specification focussed on plywood durability but is intended to be used in conjunction with related EN standards such as EN 335 (use classes) and EN 350 (natural durability of wood).

Q: What are the key keywords?

A: Plywood, biological durability, EN 335 use classes, preservative treatment, veneer thickness, sapwood, heartwood, installation detailing.