CBI Building Codes and Standards 4

Question 1

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

Accepted Answer

1/2-inch gypsum board on the garage side

Answer

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.

Question 2

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

Accepted Answer

5/8-inch Type X gypsum board

Answer

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

Question 3

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

Accepted Answer

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

Answer

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.

Question 4

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

Accepted Answer

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

Answer

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

Question 5

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

Accepted Answer

Minimum No. 26 gage sheet steel or other approved material

Answer

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.

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