Core Construction Skills Flashcards

When reading a construction blueprint, what does a dashed line typically represent?

Answer: A hidden or below-surface element

Dashed lines in blueprints conventionally indicate elements that are hidden from the current view, such as features below the floor or inside walls.

What is the purpose of a backer rod when caulking a wide expansion joint?

Answer: To fill the joint depth so caulk forms a proper two-point adhesion bond

Backer rod fills deep joints so caulk bonds only to the two sides (not the bottom), allowing proper elongation and preventing three-point adhesion failure.

Which fastener type should be used for pressure-treated lumber to prevent corrosion?

Answer: Hot-dipped galvanized or stainless steel fasteners

The preservative chemicals in pressure-treated lumber corrode standard steel fasteners rapidly; hot-dipped galvanized or stainless steel resists this reaction.

A handyman discovers the toilet runs continuously. After removing the tank lid, they see water trickling into the bowl via the overflow tube. What is the most likely fix?

Answer: Adjust the float so the water level sits below the top of the overflow tube

If water reaches the overflow tube, the fill valve is allowing the tank to overfill — lowering the float arm or adjusting the float cup corrects the water level.

What is the correct procedure when using a powder-actuated fastening tool (Hilti gun) on a job site?

Answer: The operator must be trained and authorized, wear PPE, and never point it at anyone

Powder-actuated tools are classified as explosive-powered tools under OSHA; operators must be trained, authorized, and use proper PPE including hearing and eye protection.

When installing a prehung door in a rough opening, what is the first critical check before shimming and fastening?

Answer: That the rough opening is plumb, level, and square

The rough opening must be plumb, level, and square before installing a prehung door — shimming can correct minor issues but cannot compensate for a severely out-of-square opening.

What is the maximum recommended extension for a telescoping ladder when the working length is specified as 24 feet?

Answer: Extend only to the working length needed, never beyond the manufacturer's rated capacity

Ladders must never be extended beyond their rated capacity; always follow the manufacturer's specifications and extend only as far as the task requires.