What are the two main classes of wood? What is the main use of each class?State the names of two tree species of each class.

3. List and discuss the five main types of defects in timber.

A simple lab test for specific gravity (SG), on two samples of timber indicate thatsample A has SG=0.4 and sample B has SG=0.5. Based on this information alone,which wood sample would you choose as a structural member for your constructionproject? Briefly explain your reason.

A bridge/joint table is exactly what its name implies. What is the substitute? What is wrong with the substitute?

Which species of wood have natural resistance to decay?

Describe how wood can be attacked by fungi.

Question 6 True or false: Moisture content of wood influences wood density only up to FSP. Select one: O True O False

What is the resonance and durability of African mahogany?

If other factors are equal, which piece of lumber is weaker: one with a slope of grain of 1 in 5 or one with a slope of grain of 1in 6?

What type of wood fastener is shown in this image? Image courtesy of reTHINK Wood.