Bs 5268 Part 2
The first is whether the treatment has been carried out at all and the second is whether it has been carried out according to the specified procedure. Most preservatives afford protection against both decay and insect attack. Collaborate, Innovate, Accelerate.
For example, although creosote has been included amongst the recommended treatments, its suitability will depend on the purpose of the building. However, for organic solvent preservatives in certain situations, e. Although panel products other than plywood are used for structural purposes it is not considered at present appropriate to include reference in this standard to such products other than plywood.
However, treatments for plywood are not so well established as those for solid timber and treatment facilities are restricted. The sapwood of all species is classified as either perishable or non-durable.
Precautions should be taken to avoid contact between uncoated aluminium sheeting and copper-containing preservatives. Verification of the treatment thus rests on knowledge of the process carried out. If rip sawing or profiling is carried out after treatment, it is essential to retreat the timber in accordance with the original specification.
Also many organic solvent preservatives are available in water-repellent grades, and it is advantageous to use this type in exterior situations. Cost of initial preservative treatment or the use of durable timbers should be balanced against the future cost of remedial treatments or replacement of failed components. This will be indicated in the amendment table on the inside front cover. If no, then preservative protection against fungal decay is considered unnecessary but insecticidal treatment to protect from insect attack is considered optional and should be considered. Use of these materials with preservative treated timber should not be undertaken without first having sought advice from the manufacturer.
If permission is granted, the terms may include royalty payments or a licensing agreement. For preservative processes other than boron diffusion and creosote, specifications are defined in terms of processing parameters and thus there are no defined loading requirements. Timber in seawater, piers, jetties, piles etc.
If a third party certification scheme does not already exist, users should consider approaching an appropriate body from the list of Association members. It is essential to stack timber carefully during this period because wetting and drying will cause timber movement and in some cases may cause distortion.
Copper naphthenate preservatives may give rise to staining problems with light coloured paints. However the only certain way to be sure that treatment has been carried out as required is to witness all aspects of the treatment process. This level should be maintained for the whole period on completion of which the cylinder should be flooded with the preservative solution before releasing the vacuum. Provided certain safeguards that attend modern construction, e. Boron diffusion treatment is carried out on green timber at source and treated timber is usually supplied already dried.
If, for any given component, all the treatments listed are shown to be suitable, the specifier should consider whether any factor outside the scope of this code influences the choice of preservative. Where experience has Desirable shown that there is a high risk of fungal decay. Other preservatives are usually colourless.
However, it is important that an adequate drying period should be left between preservative treatment and finishing. The second relates end-use to the need to avoid the consequences of failure, both in terms of economics and the safety of persons or property. Both the natural durability and treatability of the heartwood are relevant to the decision as to the type and intensity of treatment. Timber in bridges, towers, masts, framework piling etc. Will the use of a species with Yes.
BS 5268 PART 5
Code de bonne pratique de la conception de contrainte permissible, materiaux et main d'oeuvre Title in German Verwendung von Holz im Bauwesen. It is essential to protect boron-treated timber against wet weather conditions during prolonged storage. However, the following key facts should be noted.
Even where the nature of the commodity does not require such redrying, a period of seven days before use should be allowed for the preservative salts to fix, i. It is important not to apply any metal fittings until the period of fixation of these preservatives is complete. This standard has been updated see copyright date and may have had amendments incorporated. It can occur in both dry and damp situations.
It is considered unwise to dispense with preservative treatment of susceptible timbers unless special circumstances prevail. If timber is frozen the penetration of preservative is limited. Copies have been deposited with the British Standards Institution.
Roof timbers referred to in The Building Regulations. Is the timber component listed in Yes.
BS 5268-2 2002
Code de bonne pratique de la conception de contrainte permissible, materiaux et main d'oeuvre. For details of these and other benefits contact Membership Administration. It is assumed that the roof is normally pitched, adequately ventilated, etc. Where it is not possible to use timbers which have sufficient natural durability, preservative treatment should be used.
Where these properties impose a limitation on their use for a particular commodity this is noted in the appropriate clause. However, highly porous zones are sometimes encountered, particularly in European redwood, bad romance glee cast mp3 which can rapidly absorb excessive amounts of preservative solution.
However, those of the organic solvent class may be formulated with or without an insecticide and care should be taken to specify the correct grade. Code of practice for the preservative treatment of structural timber. Users of British Standards should make sure that they possess the latest amendments or editions. Sapwood should never be used in a hazardous location without preservative treatment.
Committees responsible for this
Pitched roofs risk of wetting. Decide on whether to treat or not to treat with preservative.
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