Treat wooden beams against rotting


The treatment of wooden beams serves several purposes. In addition to the preservation against rotting the wood should be protected from insect and vermin infestation. There are also optical considerations such as color, grain and texture intensity. For almost tasks both inside and outside there are different methods and means to choose from.

Deciduous and coniferous trees

As with any wood preservation treatment, the opinions of professionals differ as to the extent and means of protecting wooden beams. While this question can be answered in the case of non-load-bearing decorative bars in terms of appearance and taste, static structural stability must be maintained in the case of load-bearing beam constructions, especially outdoors.

In the case of a new construction, the choice of the type of wood can influence the necessary treatment. Deciduous trees such as oak, larch, robinia and elm, as well as tropical woods such as bamboo, bangkirai and teak are weatherproof. The wooden beams can not be adequately protected with natural preservatives such as oil or wax.

Coniferous plants must be impregnated. Spruce, pine and fir rot without adequate and repeated treatments. Here, the priming and subsequent brushing with a glaze has established as a common method.

Whistleblower DIN 68800

For crop logs, the wood species should first be determined. In many old buildings, the more durable deciduous tree was used, almost automatically. When the wooden beams are processed, often a resilient heartwood can be exposed after the removal of frayed sapwood. In this case, the decision to treat is again a matter of taste.

When painting inside wooden beams you should completely abstain from chemistry. Oils and waxes are sufficient as a treatment. If necessary, you can make optical changes by limescale or painting with solvent-free inks.

The painting of outside wooden beams is produced in coniferous trees without chemical additives not sufficient weather protection. The technical requirements and requirements for carrying out appropriate treatment are set out in writing in DIN 68800.

Tips & Tricks

Find out more about details in the DIN 68800 regarding beams and sapwood in beams, mechanical insect barriers and ventilated construction systems, which can also be subsequently optimized. Any avoidance of chemical impregnation will protect your health and the health of your wooden beams.


Video Board: How to Repair Wood Rot. Dry Rot and Wet Rot.