The sap flows from a tree via the sapwood to the needles and leaves. This is also where nutrients, such as sugars, are stored. Together with moisture, oxygen and temperature, this makes the sapwood attractive to insects and fungi. The heartwood is often darker in colour and gives the tree strength. The wood contains substances that are generally resistant to fungi and bacteria.
The heartwood of larch and Douglas fir is also highly resistant to weather influences.
Douglas has a thick sapwood layer, sometimes up to 10 cm thick. Larch has a sapwood layer of about 2 to 3 cm thick. That is why larch can be supplied with little sapwood and Douglas cannot.
Source: State Forestry Service – Hollands Hout
Our clients have realised wonderful projects. Do you have a question? Then take a look at our knowledge base or take contact with one of our specialists.
You already know exactly what you need? Then request a no-obligation quote. Where necessary, we will be happy to provide advice.
