Impregnate larch wood - is that necessary

Many are in doubt as to whether to impregnate their larch wood or not. Partly there are conflicting statements of experts, sometimes protection is recommended, sometimes not. What is really true and when you should treat larch wood, you will learn in this post.

Durability of larch wood

Larch wood is by nature relatively weatherproof and resistant to pests such as insects and fungi. When it is exposed to the weather, this is usually not problematic for larch wood. Regardless of time forms but a silvery-gray patina on the wood. This graying is a natural process in which even (weatherproof) wood protects itself against the destructive UV radiation.

protection requirements

Basically, there is no need for protection if you can live with the (uneven) graying. Depending on the extent of the weather to which the wood is exposed, it unevenly grayens. This leads to color differences, for example on facades.

Constructive wood protection

The most important aspect of wood exterior is clear structural wood protection. The wood must be installed so that it remains protected against permanent wetting, and can dry out again and again. If this condition is met, impregnation protection does not necessarily have to be carried out in order to preserve the life of the wood.

Protection against graying

To protect against graying (the larch wood retains its original shade instead of patina), pigmented wood stains must be used. Most colorless wood preservatives do not provide UV protection as they contain no pigments. An impregnation usually provides only a certain protection against moisture effects (in constructive wood preservation not absolutely necessary) and against blue-mushrooms. However, there are a few exceptions to wood preservatives.


In order to renew the UV protection ingredients, it is necessary to have regular follow-up treatment, about once a year will be sufficient in most cases. In some cases, more frequent or less frequent aftertreatment may be required, depending on the particular application and the weather conditions.

Use only tested products

In Germany, there is a list of wood preservatives in which manufacturers can register their products after an efficacy and safety check. This is regulated throughout the EU. Unchecked products on the market do not guarantee the product's health or safety. On such products (usually low-cost suppliers) you should do better.

Tips & Tricks

Alternatively, you can also achieve a uniform graying by chemical pre-weathering. There are a few oil picks in the trade, which usually carry the name "Weather Stain" in the name.

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