Practice Retention And Penetration Checks (2.11.1) - Testing of Timber

Practice: Retention and Penetration Checks

Lesson 2.11.1Testing of Timber

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9 questions

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6 sample questions

Question 1.
What does retention measure in timber preservation?
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Think about how much treatment is 'left' in the wood.
Question 2.
Why is penetration depth important?
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How deep is the treatment into the wood?
3Question 3.
What is 'retention' in timber preservation?
- A) Depth of preservative
- B) Amount of preservative in wood
- C) Type of preservative
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Think about what retention signifies in preservation.
4Question 4.
True or False: Penetration indicates how deeply the preservative has treated the wood.
- True
- False
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Consider the meaning of penetration in context.
Question 5.
A new batch of timber has a total weight of 80 kg and retains 10 kg of preservatives. How would you calculate the retention, and why is this important for the longevity of the wood?
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Think about the proportion in relation to the weight.
Question 6.
A timber piece shows that the preservative only penetrated 5 cm deep after testing. If the expected depth was at least 10 cm, discuss the implications for the wood’s durability.
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What happens if the treatment does not go deep enough?

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