Building Codes & Regulations Flashcards

Under the IRC, what is the minimum net clear opening width required for an emergency escape and rescue opening (EERO)?

Answer: 20 inches

The IRC requires EEROs to have a minimum net clear opening width of 20 inches.

What is the primary purpose of a vapor retarder in wall construction under building code requirements?

Answer: To reduce moisture migration into the wall cavity

Vapor retarders limit the diffusion of moisture vapor into the wall assembly, reducing condensation and moisture damage.

Under the IRC, handrails on stairways must be graspable and positioned at what height range above the stair nosing?

Answer: 34 to 38 inches

The IRC requires handrails to be between 34 and 38 inches above the stair nosing.

A deck ledger board must be connected to the house structure using which type of fasteners to resist lateral loads?

Answer: Structural lag screws or through-bolts

Lag screws or through-bolts are required for ledger connections to resist the significant lateral and withdrawal forces on deck structures.

Under NFPA 70, arc fault circuit interrupter (AFCI) protection is required in which location?

Answer: Most living spaces in dwelling units including bedrooms

The NEC requires AFCI protection in most living areas of dwelling units including bedrooms, living rooms, dining rooms, and others.

Which document provides the legal basis for a local jurisdiction to enforce building codes?

Answer: An enabling ordinance adopted by the local government

Local jurisdictions adopt model codes through an enabling ordinance, giving them legal authority to enforce code requirements.

Under the IRC, what is the minimum required pitch for a roof using asphalt shingles?

Answer: 3:12

The IRC requires a minimum 3:12 slope for standard asphalt shingle installation without special low-slope procedures.