Application processes

Insect and fungal infestation in supporting wooden components can substantially weaken a structure’s statics. The consequences can be serious: considerable safety-related deficiencies and financial damage. Recognising pest infestation early and treating the affected components with professional competence is therefore of great importance. Various processes can be used to do so.

Damage by insects

First the extent of the damage must be determined. Rotten sections of wood must be removed, frass burrows brushed out and the wood cleaned. Timbers which are statically no longer reliable are replaced by timbers which have undergone preventive treatment.
When using water-soluble preservatives, moisture levels in the wood must be sufficiently high. If not, the wood may have to be moistened.
The preservatives are applied by brushing, spraying and/or borehole impregnation.

Damage by fungi

Wooden parts with fungi attack have to be replaced by preventive treated wood.

Fungal infestation in masonry

Fungal infestation in masonry can be effectively combated with Wolman mould barriers.
As fungi need moisture to flourish, the source of the moisture must first be determined and eliminated. The affected areas must be uncovered (chipping off plaster, chiselling out grouting) and the lichen on the surface (Mycelia) scorched off.
The mould barrier is applied by mean of borehole impregnation or borehole pressure impregnation to penetrate the masonry or by spraying or foaming onto the masonry surface.

Standards and data sheets

The implementation of curative measures in Germany is governed by the wood preservation standard DIN 68800 part 4 "Curative measures to counter wood-destroying fungi and insects".
These curative measures may only be carried out by qualified companies or personnel.

Such specialist companies can find detailed instructions on controlling dry rot in the WTA data sheet 1-2-05/D issued by the International Association for Science and Technology of Building Maintenance and Monuments Preservation in Munich.


Removing affected wood with an axe