Ten things you should know about Finnish wood

In outdoor landscapes, preservative wood is often used, but do you understand the craftsmanship, selection, and use of preservative wood? Do you know the Finnish wood that everyone often mentions? Let's take a look at it together.

01. What is Finnish wood?

After being treated with preservatives, wood becomes rot-resistant, mildew-resistant, and termite-resistant. Wood made from Nordic pine is often called Finnish wood.

02. Are there fake antiseptic wood?

Unscrupulous merchants use pigments to dye and impregnate ordinary wood to pretend it is "anticorrosive wood". However, the real anticorrosive wood appears green or blue-green because of the copper in the preservative.

03. What are the common antiseptic wood species?

At present, the main anticorrosive wood species used in the domestic and international markets are Russian Scots pine, European Scots pine, American southern pine, radiata pine, etc. Let's take a look at the differences between the most common Scots pine anticorrosive wood and Finnish wood.

The physical properties and characteristics of Finnish wood are close to those of Russian Scots pine. The material is more stable than Russian Scots pine and has a longer service life.

04. Does antiseptic wood also have requirements for moisture content?

This is necessary. Since wood shrinks when dry and expands when wet, the antiseptic wood must also be dried to control its moisture content.

Before anti-corrosion, the wood must be pre-dried so that the preservative can fully penetrate the wood. After anti-corrosion, it must be kiln-dried for the second time to stabilize the plasticity of the wood and keep its moisture content below 18%. This way, the wood is less likely to crack. But the main thing is to allow the preservative to effectively combine with the wood cells and solidify them, so that the wood has excellent anti-corrosion properties and greatly extends the service life of the wood.

Will knots on the wood surface affect the antiseptic wood?

Knots, cracks, and deformations on the wood surface can affect its corrosion resistance. Knots and other defects not only affect the wood's appearance but also serve as a major channel for fungi and insects to erode the wood.

06. How to judge whether the antiseptic wood is qualified by appearance?

The smoothness and color uniformity of the surface of the antiseptic wood can reflect the effect of the antiseptic treatment. The smoother the surface of the antiseptic wood and the more uniform the color, the better the effect of the chemical treatment.

07. How do we choose different grades of antiseptic wood?

If used outdoors but not in contact with the ground, the antiseptic wood should have a drug loading greater than or equal to 4 kg/m3; if used outdoors, in contact with the ground or immersed in fresh water, the antiseptic wood should have a drug loading greater than or equal to 9.6 kg/m3.

08. What is preservative penetration?

Preservative penetration refers to the depth to which the preservative has penetrated the wood. The greater the penetration depth, the less likely the protected, high-pressure treated wood will be damaged. For example, for CCA-C treated wood used outdoors but not in contact with the ground, the penetration depth should be greater than or equal to 85%. For outdoor use in contact with the ground or immersed in fresh water, the penetration depth should be greater than or equal to 95%.

Now let's see how to calculate penetration.

09. What are the common sizes of antiseptic wood?

10. How to install antiseptic wood?

Anticorrosive wood can be installed according to its purpose. Common installation methods include: overlap, lock and flat joint, grille, slat, etc.