Damage caused by wood-destroying insects

Beetles, larva and patterns

Determine the extent of the infestation

If live infestation by dry wood insects such as house longhorn beetle (Hylotrupes bajulus), the rodent beetle (Anobiidae) or the sapwood beetle (Lyctidae) is found, the extent of the infestation must first be determined. For this purpose, all construction timbers at the accessible edges in the sapwood area must be checked for infestation intensity and extent at appropriate intervals by scoring or drilling. Wood based materials should only be inpsected for existing exit holes. If necessary, existing cladding or flooring are to be removed. In areas that are difficult to access, e.g. in converted attics, the roof may need to be opened. In the case of historically valuable structural parts, a levelling off should be avoided if possible to preserve the aesthetics of the construction.

Insect species

  • Longhorn beetle
  • Brown sapwood beetle
  • Common rodent beetle
  • Snipe beetle
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Check abutment down to the intact areas and statics

All wood to be treated must then be freed from bark and bast. In addition, the hollowed out parts of the structure must be removed except for the more internal feeding passages and the exposed feeding passages brushed out. The remaining cross-section must now be checked for its residual load-bearing capacity. If the structure no longer meets the static requirements, reinforcing measures must be taken with preventively protected woods. If necessary, a structural engineer must be consulted.

Selection and application of the wood preservative

The exposed wooden surfaces can now be treated by brushing or spraying. The required application quantity for the solvent-based Anti-Insect* must be applied in at least two working steps, for the salt-based Adolit Woodworm-Free* in three working steps. The required application quantity for pesticides is 300 - 350 ml/m2. The effectiveness of the wood preservatives to be used is determined by the active ingredients used. Agents with fast or slow effectiveness are used. In the case of slow-acting agents, it cannot be ruled out that a living residual infestation (especially in the case of rodent beetle infestation) may still be present after up to 5 years. On historically valuable structures and in areas difficult to access, where removal of the mossy parts or all-round treatment with the protective agent is not possible, an additional borehole impregnation or a borehole pressure impregnation must be carried out. The latter is particularly advantageous when working "overhead". Details of this special procedure can be found in the technical data sheets of the respective products.

* Use biocide products carefully. Always read label and product information before use.

BAuA protection guidelines for handling wood preservatives

The protection guide describes the basic rules of organisation and hygiene for combating wood preservation and provides general instructions and measures to protect professional users from excessive exposure to hazardous substances. It serves as a checklist for the employer or his representative.

The protection guide describes the basic rules of organisation and hygiene as well as technical measures for all open applications of wood preservatives such as brushing, rolling, filling or wiping and describes the general instructions and measures that protect the professional user from excessive exposure to hazardous substances.

Damage caused by wood damaging insects

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Water-based wood preservative for infestation control with long-lasting results

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