Building Systems and Components Flashcards

What is the minimum recommended clearance between the bottom of floor joists and the ground in a crawl space?

Answer: 18 inches

IRC and most standards require at least 18 inches of clearance between the bottom of floor joists and the ground in a crawl space to allow for inspection and ventilation.

Which type of pipe material is identified by its blue or blue-striped color?

Answer: PEX-B cold water

PEX tubing for cold water lines is typically blue, while red indicates hot water lines, helping installers and inspectors quickly identify the system.

When inspecting a gas furnace, which condition would indicate a cracked heat exchanger?

Answer: Flame rollout when blower activates

Flame rollout when the blower turns on is a classic sign of a cracked heat exchanger, as combustion gases escape into the air distribution system.

What is the purpose of a P-trap in a plumbing drain system?

Answer: Hold water to block sewer gases from entering the home

A P-trap retains a small amount of water that acts as a seal, preventing sewer gases from passing through the drain and entering the living space.

An inspector notices the main electrical panel has double-tapped breakers. What does this mean?

Answer: Two circuits share one breaker

Double-tapping means two separate conductors are connected to a single breaker terminal, which is a defect unless the breaker is specifically rated for multiple conductors.

What type of roof covering requires a minimum slope of 4:12 for proper installation?

Answer: Three-tab asphalt shingles

Standard three-tab asphalt shingles require a minimum roof slope of 4:12 to ensure proper water shedding and prevent moisture infiltration.

Which condition in a basement wall is most indicative of hydrostatic pressure?

Answer: Horizontal cracking in the middle third of the wall

Horizontal cracks in the middle third of a basement masonry or concrete wall are the most serious sign of hydrostatic pressure from saturated soil pushing inward.