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Question 1

Give four natural defects that can occur in wood

Answer 1

Heart rot

Resin pockets

Spalting

Live knots

Dead knots

Shakes

Frost shake

Question 2

Give three defects that can happen after wood starts to dry out

Answer 2

Twisting

Cupping

End splitting

Question 3

What are the conditions for dry rot to occur?

Answer 3

Timber with a moisture content over 20 per cent

Fungus spores

Warmth

Food

Question 4

How do you prevent dry rot?

Answer 4

Repair any water leaks

Good ventilation

Use seasoned timber with a moisture content less that 20%

Regularly reapply preservatives to timber

Question 5

What are the methods of seasoning?

Answer 5

Natural or air seasoning

Kiln or artificial seasoning

Question 6

What are the natural air seasoning advantages and disadvantages?

Answer 6

Advantages
No expensive material or machinery

Cheap

Sustainable

Disadvantages
Slow

Moisture content cannot be controlled

End grain must be treated or protected

Question 7

Draw natural (air) seasoning

Answer 7

Rainproof overhanging roof

Stickers placed one directly above the other

Blocks/bricks stack raised off the ground