Roslag: a Norwegian method of protecting wood from moisture

Roslag is a traditional norwegian method to protect wood from moisture, fire and other risks.

1.Composition and Application

Composition

(1/3) Pine tar (Norwegian tar), (1/3) turpentine oil, and (1/3) linseed oil

Application

Initially 2 to 3 coats on dry wood (light layer), then 4 to 5 coats on wet wood to fully saturate the wood fibers.

2.Risks of degassing

The Risks only until several days after the application.

Gum turpentine (a natural solvent) evaporates rapidly during drying. This release is normal, is accompanied by a strong pine or smoky odor, and dissipates within a few days.

During the drying process (which occurs through oxidation upon contact with air and UV light), the pine needle oil releases a characteristic odor. While it does not emit toxic chemicals such as formaldehyde, it can cause a persistent odor that may recur during hot summer weather.

Linseed oil carries a risk of spontaneous combustion. Cloths or materials soaked in this mixture must be disposed of in water or safely burned. This applies specifically to the saturation stage.