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Materials Overview

The quality of the wood used affects a structure's strength, movement as it settles, and visual effect. After all the pieces are put together, what you see is wood. Wood has a life longer than our lifespans, even after it's harvested.

The quality of the materials is such an important factor in any product. For timber frames, wood quality has first priority. The quality of timber frame materials can be broken into three categories: fibre quality, sawing quality, and dryness.

Fibre quality

• How tight the grain is
• How straight and uniform the grain is
• How small the knots are
• How sound the fibres are

Sawing quality

• How the timbers were milled

Dryness

• How dry the timber is before it's cut into joinery
• How the timber is dried

When logs are harvested, they still have water in them that was distributed up the tree from the roots. When the moisture content drops to below 30 percent, the wood starts to shrink and then change shape. This transformation continues until the wood moisture is stabilized by the environment. If the joinery is applied before the wood is stabilized, the shape of the joinery will change as the wood shrinks and moves.

The wood grain has a lot to do with this transformation.

What moisture content do we aim for? That depends on the destination of the product. Dry climate demands drier wood. In wetter climates, if too-dry wood is used, the dimensions and shape expand after the wood reaches its destination.

Because of the initial increased cost of using dry material, people often decide to go with green materials. But when you consider the result you will get from using green wood, using dry wood is such a good investment.