What are the two broad categories of treated lumber mentioned in the video?

• Ground contact and non-ground contact

• Softwood and hardwood

• Pressure treated and untreated

• Chemical treated and natural

What is the main concern regarding the older pressure-treated lumber?

• It is too expensive

• It contains arsenic

• It rots too quickly

• It is difficult to find

On what scale is chemical retention for treated lumber graded?

• 1 to 10

• A to Z

• 1A to 5C

• Low to high

What rating is suggested for deck boards that lie flat?

• 1A

• 2B

• 3B or higher

• 5C

What do lumber manufacturers provide to simplify choosing the right lumber?

• Price tags

• Detailed instructions

• Tags indicating above ground or ground contact use

• Color coding

What should you do if you're unsure about the type of lumber to use?

• Guess based on price

• Consult a lumber expert

• Use whatever is available

• Look it up online

Explain the significance of ground contact lumber compared to non-ground contact lumber. (Your answer should include basic grammar [1 point] and punctuation [1 point])