Pine Tar and Tar Paints – Traditional Wood Protection Solution
Among various wood protection agents, only a few can boast such a long and convincing history as pine tar. This is evidenced by the many wooden buildings and structures in Scandinavia and the Baltics with over 100 years of history, which have remained excellently preserved to this day.
In this article, we will explore what exactly pine tar is, how it protects wood, and in which cases its use is most appropriate.
A wood protection agent with a centuries-old history
Along the coasts of Sweden and Norway, wooden churches, boat sheds, and residential buildings can still be found, some over a hundred years old, and some even several centuries old. Many of them have been protected throughout their lifetime solely with pine tar, with surfaces recoated every 10–20 years.
Similar traditions also exist in the Baltic states. In Latvia, Lithuania, and Estonia, similar climatic conditions prevail—wet autumns, cold winters, and wood that continuously expands and contracts due to temperature and humidity. Tar as a wood protection agent was widely used long before the advent of synthetic coatings.
What exactly is pine tar?
Pine tar is obtained by slowly heating resin-rich pine wood—most often stumps and roots—in a limited oxygen environment. Under the influence of heat, the wood releases its natural resins and oils, forming a thick, dark liquid.
The result is pine tar, a product without synthetic solvents, without artificial biocides. In fact, it is the wood's own natural defense system.
This also explains the properties of tar. A living pine protects damaged areas with resin, preventing water and rot-causing organisms from entering. Pine tar provides this same protection for fences, facades, roofs, and other wooden structures.
How does pine tar protect wood?
Most modern wood coatings form a film on the surface. Pine tar works differently—it penetrates deeply into the wood and protects it from the inside against moisture, rot, mold, and pests.
Moisture
Moisture is the root cause of almost all wood problems. When absorbing water, wood swells, but when drying, it shrinks. Over years of repetition, this cycle causes deformations, cracks, and eventually rot.
The resin acids and fatty acids in pine tar naturally repel water, reducing its absorption into the wood fibers. However, the most important aspect is that the tar coating does not form a hermetically sealed "film." It still allows moisture to evaporate from the inside.
The wood continues to "breathe." In contrast, modern coatings often prevent moisture from escaping the wood's pores, creating ideal conditions for rot development. Tar helps avoid this problem.
Rot
Rot is caused by fungi that require moisture and an available organic environment.
Pine tar works in two ways: it reduces the moisture level in the wood and contains phenolic compounds – substances with natural antiseptic properties. These compounds inhibit the development of rot fungi.
Less moisture and an unfavorable environment mean that the risk of rot formation is significantly reduced.
Mold
The same phenolic and acidic compounds that inhibit rot development also help limit the formation of mold and other surface microorganisms.
Mold requires a damp environment. A breathable, water-repellent, and slightly antiseptic surface is not suitable for it.
Wood-boring beetles and other pests
The distinctly resinous structure of pine tar makes treated wood less attractive to wood-boring beetles and other wood-damaging insects.
Tar is not an insecticide and should not be used as a pest extermination agent. However, the resin-rich, antiseptic surface helps deter pests from inhabiting untreated wood.
This is one of the reasons why pine resin and tar have been used for centuries to protect ship hulls, tool handles, and other wooden products.
Flexible protection
Tar forms a very flexible coating. It penetrates deeply into the wood, does not crack, and "moves" with the wood under the influence of seasonal temperature and humidity fluctuations.
It does not peel or crack like many synthetic paints. Therefore, maintenance is much simpler – there is no need to remove the old coating before repainting. The surface is cleaned, and a new layer of tar is applied.
Which product to choose?
Pure pine tar (Furutjära)
Traditional Swedish pine tar in its purest form. It is the classic choice for wooden roofs and facades, as well as a base for preparing various mixtures.
When used in its pure form, it provides an authentic result but requires more experience in application. It needs to be heated before application and dries over several days to a week, depending on weather conditions.
Tar oil (Tjärolja 20/80)
A mixture of pine tar and cold-pressed linseed oil.
Linseed oil enhances absorption into the wood, while tar acts as a natural antiseptic. The combination of these two ingredients provides long-lasting protection against moisture, mold, rot, and pests.
Suitable for facades, terraces, fences, garden furniture, and roofs.
Tar paints (Roslagsmahogny and Silvertjära Altan)
In addition to tar, these products contain cold-pressed linseed oil, balsam turpentine, and natural mineral pigments.
The result is a decorative coating that simultaneously protects the wood and preserves its visible texture.
Available in black, reddish-brown, and silver-gray tones.
Balsam turpentine
A natural pine resin solvent used to thin tar oils and tar paints to achieve deeper penetration into the wood and accelerate the drying process.
Where is pine tar most suitable?
Pine tar products are best suited for outdoor use to provide natural protection for various wooden structures:
- for wooden facades;
- for wooden roofs;
- for terraces and walkways;
- for fences and fence posts;
- for garden furniture;
- for summer houses and other wooden structures exposed to weather conditions.
It is important to remember that tar requires untreated or previously tar-treated wood. It cannot penetrate a surface already coated with modern film-forming paints or varnishes.
Some tips for applying tar products
Since these are completely natural products without chemical drying accelerators, they require time.
Depending on the weather conditions, drying can take from one to three days or even longer. It is best to plan work in warm and dry weather – late spring or summer.
It is recommended to apply tar with a brush. It is too thick and viscous for effective spraying.
Fresh tar has a distinctive smell. It gradually fades, but for many, this scent is associated with properly maintained wood.
Why is pine tar still trusted?
Modern paints certainly have their place. However, pine tar and modern coatings serve different purposes.
Many synthetic paints form a protective film that isolates the wood from the environment. In contrast, pine tar penetrates deeply into the wood's pores, strengthening it from within – it repels water, inhibits rot and mold development, helps protect against pests, and maintains flexibility in all seasons.
This approach has helped preserve Scandinavian and Baltic wooden buildings for over a century. And it continues to work today.