Section Contents

EN 1995-1-1: 2004 + A2: 2014  Eurocode 5: Design of Timber Structures – General – Common rules and rules for building (incorporating Corrigendum, June 2006)

It includes: EN 1995-1-2 General rules – Structural Fire Design (excluding structures subject to prolonged exposure to temperatures over 65°C).

Eurocode 5 is based on determining the material’s characteristic values and replaces the permissible stress system previously used in national Codes of Practice.  It covers building design and civil engineering works using both solid wood and wood-based structural and panel products.  Of the two parts, only  EN 1995-1 is referred to here, not EN 1995 -2 Bridges.

The 10 Eurocodes deal with the structural design of buildings using different materials and include EN 1990 Eurocode: Basis of structural design and EN 1991 Eurocode 1: Actions on structures which cover the principals of structural design and the loads acting upon these structures.  It covers mechanical resistance, serviceability, durability and fire resistance of timber structures.  Requirements such as thermal or sound insulation are not considered.

Eurocodes have a corresponding National Annex for each Member State which provides Nationally Determined Parameters and allowable choices, identified in Informative Annexes.

Guide to Eurocode Service Classes:

Also see how they align to the five Use Classes in EN 335:2013

Service Class 1: characterised by a moisture content in the material corresponding to 20°C with the relative humidity of the surrounding air exceeding 65% for only a few weeks per year. (The average moisture content in most softwoods will not exceed 12%).

Service Class 2:  characterised by a moisture content in the material corresponding  to 20°C and the relative humidity of the surrounding air only exceeding 85% for a few weeks per year.  (The average moisture content in most softwoods will not exceed 20%).

Service Class 3: characterised by climatic conditions leading to higher moisture content than in Service Class 2.

: Eurocode 5 works on a limit state approach, with its  starting point the characteristic values of specific materials.  The designer must then apply additional factors relating to, for example, safety, load duration and environmental conditions.  This results in characteristic values being higher than the published permissible stress values, which already had safety values applied.

: these make it possible to take into account specific geographical, geological or climatic conditions as well specific levels of protection applicable in different Member States.  For each nationally determined parameter, the Eurocodes provide a recommended ‘default’ value which the Member State can use.  Alternatively, the Member State is free to choose a different specific value if they consider it necessary in order to ensure that buildings and civil engineering works are designed and executed in a way that does not endanger safety within that Member State.

Note for structural engineers: use in conjunction with the following standards:

EN 1990: 2002 Eurocode – Basis of design

EN 1991 Eurocode 1: actions on structures

EN 1998 Eurocode 8: for building in seismic regions





APA in Europe Wizard

All Questions OSBPlywood

What is a ‘life cycle stage’ and how do these link to the environmental assessment of whole buildings?

How do core category rules link with environmental product declarations?

Whose responsibility is it to check that wood products being imported into the EU do not originate from illegally sourced timber supplies?

Does the EUTR require mills to provide any extra documentation for customs entry into the European Union?

Must all plywood and OSB panels carry a CE marking?

What is the definition of a construction product under the CPR?

What is a Declaration of Performance referred to under the Construction Products Regulation?

What is the difference between Structural 1 and Exposure 1?

Does structural panel siding have shear values?

What are mould and mildew, and do they compromise the integrity of engineered wood?

The CE-mark on an APA plywood panel means it conforms to European Standards – but which ones?

I want to use a Rated Sheathing panel for flooring/ roofing application, what info do I need to know?

Plywood: Span rating
OSB: Span rating

What extra strength benefits do Structural 1 OSB panels provide over standard Rated Sheathing panels?

Do APA panels give off formaldehyde?

Plywood: Formaldehyde
OSB: Formaldehyde

What is the difference between a touch-sanded panel and sanded panel?

I’d like to know how APA veneer grades match those given in the European standards

How do I correctly gauge the face appearance a plywood Siding panel?

I want to specify an APA panel for concrete formwork – what do I need to know?

Are APA panels tongue and grooved on all four edges?

I am not familiar with the term ‘Sized for Spacing’ – what is its significance?

How are Performance Category and thickness related?

I’d like to know more about a panel’s Span Rating and how it links to thickness.

Plywood: Span rating
OSB: Span rating

What is Span Rating on the APA trademark and why is it important?

Plywood: Span rating
OSB: Span rating

What is the difference between Exposure 1 and Exterior plywood panels? What are their appropriate uses?

What are the main OSB panels likely to be available in Europe?

What are the main plywood panels likely to be available in Europe?

What are the main European standards that I would need to be aware of for OSB panels?

The main standards are: EN 13986 and EN 300

What are the main European standards that I would need to be aware of for plywood panels?

The main standards are: EN 13986, EN 636, EN 314, EN 635-3