Worksheet 5 – 13002 (v3) Demonstrate knowledge of timber used in construction

Student name:

Why is it important that timber is dry prior to treatment?

Why are different classes of timber treatment used in various locations in construction?

What precautions should be taken with cut ends of treated timber?

List four precautions to be taken when handling treated timber on site.

1. 2. 3. 4.

Use the ‘shapes’ function on your ‘insert’ tab to draw lines to match the timber treatment methods with their correct description.

Treatment method	Description
Boron salts	Commonly used to protect against insect attack
Pressure treated boron with glycol	The most widely used treatment, known as CCA
Copper-chrome-arsenate	A mix of borate salts in a carrier of monoethylene glycol to kill existing fungus in the wood and provide protection against future fungal attacks
Copper base chrome and arsenic free	Fungicide/insecticide applied in a spirit base, known as LOSP
Light organic solvent	Used as an alternative to CCA when customer or legislation does not allow CCA
Chemical free	A limited number of timbers in limited applications can be used without chemical treatment

Name three (3) timber surface finishes and three (3) specific order requirements and their abbreviations.

Timber surface finishes.

1. 2. 3.

Specific order requirements.

1. 2. 3.

What are the two properties for which timber is graded?

1. 2.

Identify two methods of seasoning timber.

1. 2.

What would be the appropriate action required on the discovery of:

Insect attack?

Fungal attack?

Using the diagram below, identify the minimum level of timber treatment required for each of the following building elements:

Stud	Bottom plate

Floor joist	Bearer

Exterior plywood	Timber pile

Stud Bottom Plate Floor Joist Timber Pile Bearer Exterior Plywood

WORKSHEET 5	Assessor Initials:	Date:

Assessor’s comments

Sign off check

The student has successfully completed all the worksheets and answered all the questions correctly.

Checklist:

Worksheet 1	Worksheet 2	Worksheet 3

Worksheet 4	Worksheet 5

Where reassessment of certain questions has occurred, the correct answers were:

Re-written by the student

Confirmed through oral questioning and noted next to the answer

The student has correctly answered a selection of oral questions

1	2	3	4	5

6	7	8	9

Other (specify):

In signing off this unit standard, the student can:

correctly describe timbers in terms of their species, characteristics, common usage and resource sustainability;

correctly describe timber in terms of length, size and finish;

correctly describe grades of timber and their applications;

correctly describe timber defects in terms of their effects;

correctly define terms relating to seasoning timber and the methods used;

correctly describe methods used to determine moisture content;

correctly identify common forms of fungal and insect attack and their results;

correctly describe the environmental causes of the deterioration of timber and actions to prevent them;

correctly explain preservative treatment of timber and the associated health and safety requirements for handling and disposal; and

correctly describe the use, care and handling of treated timber.

Assessor name: Assessor signature: Date:	Please confirm result: A = Achieved, N = Not Yet Achieved