timber powerpoint

Level 2 Diploma in Site Carpentry

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PowerPoint presentationTimber

Unit 208: Carry out first fix frames, partitions and

stairs

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Timber

Timber is classified as either

hardwood or softwood

Hardwood trees have broad

leaves with an encased seed

and known as deciduous.

Softwood trees have needles and

seeds held in cones and known

as coniferous.

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Timber conversion

Conversion is the sawing of a log into commercial boards or planks.

There are four main methods of conversion:

1.Through and through

2.Tangential

3.Quarter sawn

4.Boxed heart

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Timber conversion

The simplest way of converting a log is by using a method called

through and through.

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Timber conversion

Quarter sawn

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Timber conversion

Box heart

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Timber conversion

Tangential

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Natural Structural Defects

These are defects that occur within a growing tree, and can influence

the strength and appearance of the surface of the timber.

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Natural Structural Defects

Thunder shake causes the timber to split across the grain

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Defects

Other defect can be caused by:

• Insects

• Fungi

• Conversion

• Seasoning

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Defects

Fungal Defects:

Blue stain

Dry rotWet rot

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Defects

Insects attack!

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Defects

Seasoning

Twist Cupping Bow

Case hardening Splits

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Any questions?