timber powerpoint

Level 2 Diploma in Site Carpentry

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PowerPoint presentationTimber

Unit 208: Carry out first fix frames, partitions and

stairs



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.



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



Timber conversion

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

through and through.



Timber conversion

Quarter sawn



Timber conversion

Box heart



Timber conversion

Tangential



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.



Natural Structural Defects

Thunder shake causes the timber to split across the grain



Defects

Other defect can be caused by:

• Insects

• Fungi

• Conversion

• Seasoning



Defects

Fungal Defects:

Blue stain

Dry rotWet rot



Defects

Insects attack!



Defects

Seasoning

Twist Cupping Bow

Case hardening Splits



Any questions?

timber powerpoint

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