Types Of Wood Defects

Common Defects In Wood

The drying out process of timber is very important, because if the wood is not dried out in the correct manner or method, stresses in the wood can and will occur, making it very difficult or unpredictable to work with or impossible to use for a certain project at.

Before you use any solid types of wood for a project, it is very important to always inspect the surface of the wood for any obvious faults such as:

Splits
Knots
Uneven Grain
Cracking

Always look at the end grain section of your timber to see how the piece was cut from the log, and to check for any distortion.

Make sure to sight along the length of the timber to check for any twisting or bowing. Also look for any evidence of insect attack.

wood-defects-img-1The Most Common Defects In Timber Are:

1) Surface Checking

Surface checking is usually found along the rays of the wood. It is caused by too rapid drying of the surface of the timber.

2) End Splits

Such splits are very common defects caused by exposed ends drying out to rapidly. Sealing the ends of the stacked boards with waterproof paint can prevent this.

3) Honeycomb Checks

This defect is caused when the outside of the timber stabilizes before the inside is dry. The inside shrinks more than the outside, resulting in torn internal fibres.

4) Shakes

These are defects in the structure of the wood which are caused by growth defects or shrinkage stresses. Cup or ring shakes are splits that occur between the annual growth rings.

wood-defects-img-25) Bowing Or Warping

This is caused by badly stacked boards, wild grain or stresses caused by poor seasoning of the timber. Reaction wood is also prone to twist or cast when its cut or dried.

6) Dead Or Encased Knots

These are the remains of dead branch stumps overgrown by new annual growth rings. Generally the wood around the knot has an irregular grain pattern and is very difficult to work.

7) Ingrown Bark

This can mar the woods appearance and weaken its structure.