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5. Special cases of frameworks
In the most common cases, an interior structure is classified in risk class 1 or even 2, if transport, storage or the building site present a risk of temporary wetting of the wood. This is not the case when the structure is located in a humid atmosphere. Depending on the extent of the risk of wetting and the position of the timber in the structure, it may be necessary to move up to class 3 or 4, in which case the treatment or choice of species must be adapted accordingly. Table 7 clarifies these points and indicates the corresponding risk class for each exposure condition.
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Special cases of frameworks
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Reference documents
- Building work – Construction of timber-frame buildings and houses - NF DTU 31.2 - 01-11
- Rules for using wood in construction – Visual grading for structural use of French sawn softwood and hardwood - NF B 52-001 - 08-11
- CB 71 rules – Calculation and design rules for timber structures - DTU P 21-701 - 06-84
- Wood preservatives – Determination of preventive action against...
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