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Site Carpentry - Core Subjects > Timber Technology > Flashcards

Timber Technology Flashcards

1
Q

Name three parts in a cross section of a tree?

A

Bast, cambium, annual rings, pith, hardwood, growth rings, ray, sapwood, bark

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2
Q

What hardwood would BEST be suited to be used to construct a staircase?

A

Oak

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3
Q

What grade of plywood should be used externally on the building.

A

Weather and boil proof (WBP)

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4
Q

Deciduous trees are mainly what type of tree?

A

Hardwood

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5
Q

When cutting WBP plywood, what component of the board is the most hazardous to our health?

A

The Formaldehyde in the adhesive.

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6
Q

What defect caused by the middle of the tree decaying?

A

Heart shake

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7
Q

Is larch a hard or softwood?

A

Softwood

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8
Q

Explain what a natural defect in timber is?

A

A defect that happens when the tree is growing.

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9
Q

Explain what a seasoning defect in timber is?

A

A defect that happens when the timber is being dried.

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10
Q

What method of timber conversion is used to produce joist section timber?

A

Tangentially sawn.

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11
Q

What method of conversion will produce “Silver” grain in oak timber?

A

Quarter sawn.

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12
Q

What method of conversion is used to produce timber where the centre of the tree is rotten?

A

Boxed heart

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13
Q

Is Mahogany a hard or softwood?

A

Hardwood

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14
Q

Is a dead knot a natural or seasoning defect?

A

Natural defect.

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15
Q

What is the ideal moisture content for a piece of timber which is to be fixed externally would be:

A

18 - 20 percent moisture content.

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16
Q

State two methods of seasoning timber?

A

Air and kiln drying.

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17
Q

What would be the ideal moisture content for a piece of timber which is to be placed next to a central heating radiator?

A

6 - 9 percent moisture content.

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18
Q

What is the most effective method of applying timber preservative?

A

Pressure treatment.

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19
Q

How is timber graded?

A

Visually and mechanically

20
Q

C16 is a timber classification. What attribute of the timber does this refer to?

A

Strength (Stress Graded).

21
Q

Is Douglas fir a hard or softwood?

22
Q

Is twist (wind) a natural or seasoning defect?

A

Seasoning defect.

23
Q

Is cupping a natural or seasoning defect?

A

Seasoning defect.

24
Q

What timber that is creamy white with occasional dark streaks, and can be used for building furniture, boats, and tool handles.

25
Q

Which type of timber seasoning is better for the environment?

A

Air drying, no heat required

26
Q

What type of defect occurs when timber is seasoned too rapidly and the outside dries, sealing the inside?

A

Case hardening

27
Q

Is a thunder shake a natural or seasoning defect?

A

Natural defect

28
Q

How can wet rot be eradicated?

A

Cut out the rot and replace with new timber and remove the source of wetness.

29
Q

Is Twist (wind) a natural or seasoning defect?

A

Seasoning defect.

30
Q

state 2 ways preservative can be applied to timber?

A

Brush, spray, dipping, under pressure.

31
Q

What is the most effective type of preservative is:

A

Organic solvent

32
Q

A manmade board with compressed wood flakes is called what?

A

Sterling board (OSB)

33
Q

A manmade board with a odd number of layers bonded together at right angles to each other is called?

34
Q

What grade of plywood could be used in extreme weather conditions?

A

Weather and boil proof (WBP).

35
Q

What does MDF stand for in relation to man-made boards?

A

Medium density fibreboard

36
Q

A board material used to finish walls and available in moisture resistant, fire resistant and acoustic grades is best known as what?

A

Plasterboard.

37
Q

Is Cedar a hard or a softwood?

38
Q

Is Ash a hard or softwood?

39
Q

Explain what is meant by botanical differences in relation to timber.

A

Hardwoods loose their leaves, have fruit, broad leaves, complex cell structures.
Softwood, evergreen, have cones & needles, simple cell structure.

40
Q

What is the purpose of the bark on a tree?

A

To protect the tree from insect attack.

41
Q

Why are trees important to human life?

A

They take in carbon dioxide and gives out oxygen (photosynthesis).

42
Q

Explain evergreen in relation to botanical differences of timber.

A

Softwood trees are evergreen

43
Q

Which method of timber conversion produces strong timber that could be used for structural timber?

A

Tangentially sawn

44
Q

Which method of timber conversion is the most economic and produces very little waste.

A

Through and through

45
Q

Which section of the tree is the active part that takes the nutrients to the leaves?

46
Q

Which section of the tree produces the most durable wood?

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