What is KD spruce?
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Moreover, what is KD SPF wood?
Spruce, Pine, and Fir, the three softwood species that make up SPF lumber products, are processed together due to their similar appearance and properties. Products can be Kiln Dried (Maximum 19% moisture content), Heat Treated (KD-HT), Air Dried (AD) and Green (GRN).
Beside above, how good is spruce wood? Durability. Spruce is only of low durability (durability class 4, acc. to EN 350-2), which means that, unprotected or untreated, it is not very resistant to the weather, but is quite resistant to acids and alkalis. You can find an overview of durability levels of the various wood species here.
Besides, is Douglas fir stronger than spruce?
There was some twisting, but that's the way trees are. In short, the doug fir handles loads well-can't tell you about spruce. Doug Fir is a different species than Balsam or Alpine Fir and is graded differently. Doug fir has a higher span rating than Spruce or Fir.
Is SPF lumber treated?
First of all, SPF stands for Spruce Pine Fir, which indicates a mix of the wood types. When used externally, SPF is often pressure treated to protect it, but cedar has naturally occurring preservatives called tannins that help to maintain the quality of the wood.