Purpose Numeracy
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Basics
- PSI of wood - 1000
- PSI of steel -50000
- PSI of plastic - 5000
- PSI of rock - 5000
Exercises in Structural Design With Wood
State your assumptions. The answer follows.
- Calculate pullout force of a nail in wood
- How deep would a nail have to be driven into wood to break before pulling out?
- Calculate pullout force of deck screw per inch.
- When you reinforce 2x4 lumber at a joint with a 2 foot piece, how many deck screws would you need to use at the joint so that breakage of wood happens before pullout of screws?