Building Codes and Standards Flashcards

Under the IRC, what minimum separation is required between an attached garage and the dwelling's walls?

Answer: 1/2-inch gypsum board on the garage side

IRC Table R302.6 requires at least 1/2-inch gypsum board applied to the garage side of walls separating the garage from the residence.

When habitable rooms are located above an attached garage, what ceiling protection does the IRC require on the garage side?

Answer: 5/8-inch Type X gypsum board

IRC Table R302.6 requires 5/8-inch Type X gypsum board on the garage ceiling beneath habitable rooms.

Which door is acceptable between an attached garage and a dwelling under the IRC?

Answer: Solid wood door at least 1-3/8 inches thick

IRC R302.5.1 permits solid wood or solid/honeycomb-core steel doors at least 1-3/8 inches thick, or 20-minute fire-rated doors.

Under the IRC, may a door from a garage open directly into a sleeping room?

Answer: No, openings from a garage directly into a sleeping room are prohibited

IRC R302.5.1 prohibits openings from a private garage directly into a room used for sleeping.

Ducts penetrating the wall or ceiling separating a garage from a dwelling must be constructed of:

Answer: Minimum No. 26 gage sheet steel or other approved material

IRC R302.5.2 requires ducts in the garage penetrating the separation to be at least No. 26 gage sheet steel with no openings into the garage.

Under the IRC, what is the minimum fire separation distance below which exterior walls of a dwelling must be fire-resistance rated (unsprinklered)?

Answer: 5 feet

IRC Table R302.1(1) requires a 1-hour rated exterior wall when fire separation distance is less than 5 feet.

Townhouses built under the IRC are typically separated from each other by which assembly when no automatic sprinkler system is provided?

Answer: Two 1-hour fire-resistance-rated walls or a common 2-hour wall

IRC R302.2 permits townhouse separation using two 1-hour walls or a common 2-hour wall where sprinklers are not provided.