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.
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.
(Hylotrupes bajulus (L.)) 8 - 30 mm long; females larger; black to brown in colour; hairy neck shield with teardrop-shaped calluses; wing covers with 1 - 2 cross-bands consisting of light bristles; generation time: 3 - 6 (or more) years.
Up to 35 mm long, ivory; few bristles; segmented body with creeping bulges; darker head with black upper jaws (mandibles).
Infestation of coniferous woods; larval feeding tunnels only in sapwood with oval cross-section; oval exit holes 3/4 x 5 - 10 mm in thin wood surface; boring dust with fine nailing and cylindrical coparticles.
Brown sapwood beetle
Brown sapwood beetle
(Lyctus brunneus (Stephens)), 2.5 - 8 mm long; reddish brown in colour; +/- rectangular neck shield; long, slender wing covers; 2-linked antennae; generation time: 0.5 - 1 year.
Up to 6 mm long; whitish; curved on the abdomen side; when magnified with a magnifying glass with a large breathing hole in the hind body (difference to larvae of the common nail beetle).
Infestation of starch- and protein-rich imported and native hardwoods; larval feeding tunnels only in sapwood, with round cross-section; destruction to pulverization; round exit holes 1 - 2 mm in diameter; fine bore dust (talcum-like) without distinct excrement particles.
Common rodent beetle
Common nail beetle, "furniture beetle", "woodworm"
(Anobium punctatum (DeGeer)), 2.5 - 5 mm long; stocky body shape; females are larger; dark to black-brown in colour; neck shield with bulge covers the head; wing tips with dotted stripes; generation time: 2 - 5 years
Up to 6mm; whitish; curved like a narrowling; finely bristled.
Infestation of coniferous and deciduous woods; initially feeding on sapwood, later also on heartwood; irregularly running larval feeding tunnels with a round cross-section; round exit holes about 2 mm in diameter; bore dust with fine nail and excrement particles pointed on one side; tend to mass infestation.
Pied rodent beetle, "death watch."
(Xestobium rufovillosum (DeGeer)), 3 - 8 mm long; stocky body shape; females larger; brown body (neck shield, wing covers) with yellowish bristle fields; neck shield covers the head helmet-like; beetles knock during mating season; generation time: 2 - 6 (-13)years.
Up to 10 mm long; whitish; curved like an angel; fine bristles and short brownish spines.
Infestation of deciduous woods (especially oak); first sapwood, later also heartwood; sponge-like destruction; larval feeding tunnels with round cross section; round holes with 3 - 4 mm diameter; bore dust with fine nailing and lenticular excrement particles.
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 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.
The protection guide describes the basic organisational and hygiene rules as well as technical measures for spray, splash and mist applications in combating wood preservation and describes the general instructions and measures that protect the professional user from exposure to hazardous substances.