Nails, Screws, and Connectors

Check your understanding. Passing is 70% — but you can keep going to the next lesson either way.

1. Question 1

   Based on "Nail sizing", which statement is correct?

   Slope is rise per 12 inches of horizontal run.Scaffolds over 10 ft require guardrails and a competent-person inspection each shift.Use common or galvanized box nails for structural framing, not staples.Add overhead and profit on top of direct cost; 10-20% OH and at least 10% profit is typical.

2. Question 2

   Based on "Screws", which statement is correct?

   Pressure-treated lumber requires hot-dip galvanized or stainless fasteners.Label and inventory tools; insurance and police need that information.Follow up within 48 hours and explicitly ask for the job.Use a written subcontract; California pay-if-paid clauses must be very clearly worded.

3. Question 3

   Based on "Connectors", which statement is correct?

   Praise publicly, correct privately, document repeats.Use only manufacturer-specified fasteners and full nail count in metal connectors.Personal fall arrest systems need a full-body harness, lanyard, and 5,000 lb anchor per worker.Change orders must be in writing and signed before the changed work begins.