Get rid of the wood-boring insects
You hear from time to time that kerosene or diesel oil can be used to exterminate wood borers. None of these home remedies have any documented effect, and they will only work if you get so much of the liquid into the wood that the larvae actually drown in it. Both products are flammable and contain easily volatile and health-damaging substances that it is not appropriate to bring into the house. If you used diesel oil in e.g. a roof structure to combat borers, it would probably also cause a very unpleasant smell of diesel that few people would care to live in.
Use approved products against wood-boring insects
The correct method to get rid of wood pests is to always use a product approved by the Danish Environmental Protection Agency. This way, you never go wrong in the city, and you are sure that the product is both effective and that it meets the environmental requirements of the law. Sometimes it can be difficult to find out yourself which pests you have in your woodwork. It is not completely unimportant to know this for the sake of the right treatment. Then you have to resort to one of the excellent consulting companies that deal with biological damage in buildings.
At Protox, we have two different approved products that can be used against wood-damaging insects.
As a professional, you can buy boats Protox Insect and Protox Kombi Aqua, while as a private individual you can only buy Protox Kombi Aqua.
The difference between the two products is that Protox Insect must be applied with a sprayer while Protox Kombi Aqua can only be applied with a brush and roller (- therefore private individuals must use Protox Kombi Aqua). Both products are water-based and both have a MAL code of 00-1. Both products prevent the insects from attacking new areas of the woodwork, but Protox Insect has the best ability to stop the attack where the insects are currently active. On the other hand, by using Protox Kombi Aqua, you will get a treatment that simultaneously prevents insect attacks AND attacks by wood-decomposing fungi AND mould.
After treating the wood
Even after a thorough and correct treatment of the woodwork with the Protox products, "activity" in the form of "sprinkling" may still occur for a longer period, which is completely natural.
When you surface treat wood with an insecticide, it does not penetrate completely into the wood, but just forms a "poison barrier" in the outermost millimeters of the wood. The beetle larva does not discover this as long as it stays deep in the tree - under the "poison zone", where it can stay for several years, completely unaffected by the poison on the surface. But when it gets old enough to want to come out and mate, it gnaws up under the surface and pupates, and at the latest it comes into contact with poison and dies.
You will therefore experience that the attack dies out quietly over a period of several years. If you want a faster effect, you have to carry out a deep impregnation in the form of valve impregnation with Protox Insect. A valve impregnation is also the right procedure if it is a painted surface or very large and difficult-to-access timber dimensions.
Also be aware that even if the borer attack has been completely suppressed, timber can be scattered by strong wind. It is the timber that "twists" and thereby causes old drill cuttings to sprinkle out.