Finish TradesQuestion 283 of 700
On the interior of an attached garage, gypsum board fasteners into the ceiling of a garage with habitable space above are spaced to help the assembly perform. The garage-side board must generally be at least 5/8-inch Type X when there is living space above, MAINLY to:
a.Improve the paint finish
b.Provide the required fire separation between garage and dwelling
c.Reduce echo in the garage
d.Add insulation value
Explanation
The garage separation uses 5/8-inch Type X gypsum on the ceiling when habitable space is above (and 1/2-inch on common walls) to slow fire spread from the garage into the dwelling. It is a fire-separation requirement, not about paint finish, acoustics, or insulation.
Law Reference: 2025 CA Residential Code §R302.6Practice all 700 questions free — no signup required.
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