Different types of wood used to construct wooden hot tubs

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Spruce Versus Larch Versus Thermally treated wood for Wooden Hot Tubs

Spruce, larch and thermally treated wood are the three most popular types of hardwood used to construct wooden hot tubs and outdoor spas today. Each type of wood has its own set of benefits and drawbacks when used to produce wood burning hot tubs, making it important that you take the time to learn about the various properties of each hardwood before you buy a wood fired hot tub.
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Spruce Wood. What Is It?

Spruce is a variety of timber that is sourced from throughout Europe and is very commonly grown in Scandinavia. Featuring an appealing light color, spruce wood is a soft to medium grade hardwood that is used to  manufacture a wide variety of products beyond wooden hot tubs.

Pros of Spruce Wood:
  • Locks heat away to keep water warm and the surrounding area cool;
  • Does not leak resin to cause messes;
  • Softness makes construction easy and allows for simple treating;
  • Strong and durable;
  • Widely available, making prices usually lower.
Cons of Spruce Wood:
The drawbacks of spruce wood in wooden hot tubs include the following:
  • Can rot because of lower density of timber structure;
  • Requires regular sealing, making it more labor intensive.
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Siberian Larch. What Is It?

Siberian larch wood is a very dense, incredibly hard variety of hardwood, that grows in Northern Europe, mostly in the Russian conifer forests of Siberia. The hardwood is prized for being incredibly resilient and strong even without chemical additives and coatings. It is also considered one of the ecologically friendlier varieties of hardwood, commonly used in construction today. Whole structures like homes and commercial buildings can be crafted out of  Siberian larch.

Pros of Siberian Larch Wood
  • Highly resistant to rot and pests;
  • Very strong, durable wood;
  • Very long lasting;
  • Less need for sealing and maintenance.
Cons of Siberian Larch Wood
  • More difficult to work with, due to its extreme hardness;
  • Not as readily available and more expensive.
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Thermally treated wood. What Is It?

Thermally treated wood is not a single species of hardwood. Instead, it is a combination of woods that have been put through a special high temperature process that uses vapor and steam to harden the wood and make it denser. The result is a strong hardwood that has a much lower moisture content than other varieties of hardwood, yet still has the same handsome wood grain as conventional woods.

Pros of thermally treated wood:
  • Greatly reduces moisture levels;
  • Very resistant to rot and mold;
  • Free of harsh chemical additives;
  • Highly weatherproof.
Cons of thermally treated wood:
  • More expensive than other materials;
  • Some people prefer the lighter color of natural woods.
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